Mitsubishi Heavy Industries SRK63ZE-S1, SRK25ZD-S1, SRK35ZD-S1, SRK50ZD-S1, SRK71ZE-S1 Technical Manual

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INVERTER WALL MOUNTED TYPE ROOM AIR-CONDITIONER ( Split system, air to air heat pump type )

SRK20ZD-S1, SRK25ZD-S1, SRK35ZD-S1, SRK50ZD-S1 SRK63ZE-S1, SRK71ZE-S1

WALL MOUNTED TYPE ROOM AIR-CONDITIONER ( Split system, air to air heat pump type )

SRK20HD-S1, SRK28HD-S1, SRK40HD-S1 SRK20HC-S2, SRK28HC-S2, SRK40HC-S2 SRK50HE-S1, SRK56HE-S1 SRK63HE-S1, SRK71HE-S1

WALL MOUNTED TYPE ROOM AIR-CONDITIONER ( Split system, air cooled cooling only type )

SRK20CD-S1, SRK28CD-S1, SRK40CD-S1 SRK20CC-S1, SRK28CC-S1, SRK40CC-S1 SRK50CE-S1, SRK56CE-S1 SRK63CE-S1, SRK71CE-S1

Manual No. ’06

SRK-T

050

updated September 29, 2009

TABLE OF CONTENTS

1. INVERTER WALL MOUNTED TYPE ROOM AIR-CONDITIONER

(Split system, air to air heat pump type) ...................................................................... 001

2. WALL MOUNTED TYPE ROOM AIR-CONDITIONER

(Split system, air to air heat pump type) ...................................................................... 137

3. WALL MOUNTED TYPE ROOM AIR-CONDITIONER

(Split system, air cooled cooling only type) ................................................................. 261

1.1 SRK20ZD-S1 SRK25ZD-S1 SRK35ZD-S1

SRK50ZD-S1 ............................................................ 2

1.2 SRK63ZE-S1

SRK71ZE-S1............................................................. 70

1. INVERTER WALL MOUNTED TYPE ROOM AIR-CONDITIONER

Split system, air to air heat pump type

( )

CONTENTS

1.1.1 GENERAL INFORMATION....................................................................... 3

(1) Specific features.................................................................................... 3

(2) How to read the model name................................................................ 3

1.1.2 SELECTION DATA.................................................................................... 4

(1) Specifications ........................................................................................ 4

(2) Range of usage & limitations ............................................................... 8

(3) Exterior dimensions.............................................................................. 8

(4) Piping system ........................................................................................ 10

(5) Selection chart....................................................................................... 11

1.1.3 ELECTRICAL DATA ................................................................................. 12

(1) Electrical wiring..................................................................................... 12

1.1.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ............ 14

(1) Operation control function by remote control switch ....................... 14

(2) Unit ON/OFF button............................................................................... 15

(3) Power blackout auto restart function.................................................. 15

(4) Flap control............................................................................................ 16

(5) Comfortable timer setting..................................................................... 16

(6) Outline of heating operation ................................................................ 17

(7) Outline of cooling operation ................................................................ 19

(8) Outline of dehumidifying operation..................................................... 20

(9) Outline of automatic operation ............................................................22

(10) Economical operation ........................................................................... 22

(11) Protective control function................................................................... 22

1.1.5 APPLICATION DATA ................................................................................ 28

(1) Selection of location for installation ................................................... 29

(2) Installation of indoor unit .....................................................................30

(3) Installation of outdoor unit ................................................................... 32

(4) Refrigerant piping ................................................................................. 32

(5) Test run................................................................................................... 34

(6) Precautions for wireless remote controller installation and

operation ................................................................................................35

1.1.6 MAINTENANCE DATA .............................................................................36

(1) Troubleshooting procedures for electrical equipment ...................... 36

(2) Servicing ................................................................................................ 54

1.1.7 REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL

FOR AIR CONDITIONERS USING R410A............................................... 55

(1) Outline ....................................................................................................55

(2) Refrigerant piping installation ............................................................. 56

(3) Installation, removal and servicing ..................................................... 62

(4) Refrigerant recovery ............................................................................. 67

Over heat of compressor

Error of signal transmission

Outdoor fan motor error

1.1.1 GENERAL INFORMATION

(1) Specific features

The “MITSUBISHI HEAVY INDUSTRIES, LTD” room air-conditioner: SRK series are of split and wall mounted type and the unit

consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or

heating equipment with operation control switch and the outdoor unit is composed of condensing unit with compressor.

(a) Inverter (Frequency converter) for multi-steps power control

¡ Heating/Cooling

The rotational speed of a compressor is changed in step in relation to varying load, interlocked with the indoor and outdoor unit

fans controlled to change frequency, thus controlling the capacity.

¡ Allowing quick heating/cooling operation during start-up period. Constant room temperature by fine-tuned control after the

unit has stabilized.

(b) Fuzzy control

¡ Fuzzy control calculates the amount of variation in the difference between the return air temperature and the setting temperature

in compliance with the fuzzy rules in order to control the air capacity and the inverter frequency.

The flap can be automatically controlled by operating wireless remote control.

¡ Air scroll (AUTO): Flap operation is automatically control.

¡ Swing: This will swing the flap up and down.

¡ Memory flap: Once the flap position is set, the unit memorizes the position and continues to operate at the same position from

the next time.

(d) Self diagnosis function

¡ We are constantly trying to do better service to our customers by installing such judges that show abnormality of operation as

follows.

Outdoor heat exchanger liquid pipe sensor error

Discharge pipe sensor error

Outdoor temperature sensor error

2 time flash

4 time flash

RUN light keeps flashing

1 time flash

Trouble of outdoor unit

Over current

Current cut

2 time flash

3 time flash

RUN light

1 time flash

5 time flash

TIMER light

R410A models

Series No.

Inverter type

Product capacity

Wall mounted type

Split type room air-conditioner

(2) How to read the model name

Example : SR K 35 Z D - S1

Room temperature sensor error

Indoor fan motor error

Heat exchanger sensor error

2 time flash

6 time flash

TIMER light

1 time flash

RUN light

Rotor lock

6 time flash

7 time flash

2 time flash

RUN light

2 time flash

Item

Model

SRK20ZD-S1 SRC20ZD-S1

Cooling capacity

(1)

W 2000 (500~2800)

Heating capacity

(1)

W 2700 (500~4600)

Power source 1 Phase, 220-240V, 50Hz

Cooling input kW 0.44 (0.1~0.91) Running current (Cooling) A 2.4/2.3/2.2 Heating input kW 0.62 (0.09~1.27) Running current (Heating) A 3.0/2.9/2.8 Inrush current A 3.0/2.9/2.8 COP Cooling: 4.55 Heating: 4.35

Cooling

Sound level Hi 36, Me 29, Lo 21 44

Noise level

Power level

52 58

Heating

Sound level Hi 38, Me 32, Lo 25 47

Power level 54 61

Exterior dimensions

Height × Width × Depth

250 × 815 × 249 540 × 720 × 290

Color Cool white Stucco white Net weight kg 9.0 32 Refrigerant equipment

Compressor type & Q’ty

– RM-B5077MD1 (Rotary type) × 1

Motor kW – 0.75

Starting method – Line starting Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing Refrigerant control Capillary tubes + Electronic expansion valve Refrigerant

(3)

kg R410A 0.9 (Pre-Charged up to the piping length of 15m)

Refrigerant oil R 0.35 (MA68) Deice control Microcomputer control

Air handling equipment

Fan type & Q’ty

Tangential fan × 1 Propeller fan × 1

Motor W 29 24

(Cooling) 7.2 30

Air flow (at High)

(Heating)

CMM

8.3 25

Air filter, Q’ty Polypropylene net (washable) × 2–

Shock & vibration absorber – Cushion rubber (for compressor) Electric heater –– Operation control

Operation switch

Wireless-Remote controller –

Room temperature control Microcomputer thermostat – Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)

Safety equipment

O.D mm (in) Liquid line: φ6.35 (1/4″) Gas line: φ9.52 (3/8″)

Connecting method Flare connecting

Attached length of piping Liquid line: 0.47 m

Gas line : 0.40 m

–

Insulation Necessary (Both sides)

Drain hose Connectable Power source cord 2.5 m (3 cores with Earth)

Size × Core number 1.5 mm2 × 4 cores (Including earth cable)

Connection wiring

Connecting method Terminal block (Screw fixing type)

Accessories (included)

Mounting kit, Clean filter (Natural enzyme filter x1, Photocatalytic washable deodorizing filter x1)

Optional parts –

Notes (1) The data are measured at the following conditions.

1.1.2 SELECTION DATA

(1) Specifications

Model SRK20ZD-S1 (Indoor unit)

SRC20ZD-S1 (Outdoor unit)

Item Indoor air temperature Outdoor air temperature

Standards

Operation DB WB DB WB

Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612

Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612

(2) The operation data are applied to the 220/230/240V districts respectively.

(3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.

(Purging is not required even for the short piping.)

Operation data

(1)

Refrigerant

piping

Compressor overheat protection, Heating overload protection (High pressure control), Overcurrent protection, Frost protection, Serial signal error protection, Indoor fan motor error protection, Cooling overload protection

The piping length is 7.5m.

(220/230/240V)

Item

Model

SRK25ZD-S1 SRC25ZD-S1

Cooling capacity

(1)

W 2500 (500~3000)

Heating capacity

(1)

W 3400 (500~4800)

Power source 1 Phase, 220-240V, 50Hz

Cooling input kW 0.62 (0.1~0.97)

Running current (Cooling) A 3.1/3.0/2.9

Heating input kW 0.94 (0.09~1.30)

Running current (Heating) A 4.5/4.3/4.1

Inrush current A 4.5/4.3/4.1

COP Cooling: 4.03 Heating: 3.62

Cooling

Sound level Hi 37, Me 30, Lo 22 44

Noise level

Power level

53 58

Heating

Sound level Hi 39, Me 33, Lo 26 47

Power level 55 61

Exterior dimensions

Height × Width × Depth

250 × 815 × 249 540 × 720 × 290

Color Cool white Stucco white Net weight kg 9.0 32 Refrigerant equipment

Compressor type & Q’ty

– RM-B5077MD1 (Rotary type) × 1

Motor kW – 0.75

Starting method – Line starting Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing Refrigerant control Capillary tubes + Electronic expansion valve Refrigerant

(3)

kg R410A 0.9 (Pre-Charged up to the piping length of 15m)

Refrigerant oil R 0.35 (MA68) Deice control Microcomputer control

Air handling equipment

Fan type & Q’ty

Tangential fan × 1 Propeller fan × 1

Motor W 29 24

(Cooling) 8.0 30

Air flow (at High)

(Heating)

CMM

8.7 25

Air filter, Q’ty Polypropylene net (washable) × 2–

Shock & vibration absorber – Cushion rubber (for compressor) Electric heater –– Operation control

Operation switch

Wireless-Remote controller –

Room temperature control Microcomputer thermostat – Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)

Safety equipment

O.D mm (in) Liquid line: φ6.35 (1/4″) Gas line: φ9.52 (3/8″)

Connecting method Flare connecting

Attached length of piping Liquid line: 0.47 m

Gas line : 0.40 m

–

Insulation Necessary (Both sides)

Drain hose Connectable Power source cord 2.5 m (3 cores with Earth)

Size × Core number 1.5 mm2 × 4 cores (Including earth cable)

Connection wiring

Connecting method Terminal block (Screw fixing type)

Accessories (included)

Mounting kit, Clean filter (Natural enzyme filter x1, Photocatalytic washable deodorizing filter x1)

Optional parts –

Notes (1) The data are measured at the following conditions.

Model SRK25ZD-S1 (Indoor unit)

SRC25ZD-S1 (Outdoor unit)

Item Indoor air temperature Outdoor air temperature

Standards

Operation DB WB DB WB

Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612

Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612

(2) The operation data are applied to the 220/230/240V districts respectively.

(3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.

(Purging is not required even for the short piping.)

Operation data

(1)

Refrigerant

piping

The piping length is 7.5m.

(220/230/240V)

Item

Model

SRK35ZD-S1 SRC35ZD-S1

Cooling capacity

(1)

W 3500 (500~3900)

Heating capacity

(1)

W 4500 (500~5100)

Power source 1 Phase, 220-240V, 50Hz

Cooling input kW 1.09 (0.1~1.22)

Running current (Cooling) A 5.4/5.2/5.0

Heating input kW 1.24 (0.09~1.32)

Running current (Heating) A 5.9/5.7/5.4

Inrush current A 5.9/5.7/5.4

COP Cooling: 3.21 Heating: 3.63

Cooling

Sound level Hi 41, Me 32, Lo 23 48

Noise level

Power level

58 62

Heating

Sound level Hi 45, Me 36, Lo 27 50

Power level 59 64

Exterior dimensions

Height × Width × Depth

250 × 815 × 249 540 × 720 × 290

Color Cool white Stucco white Net weight kg 9.0 35 Refrigerant equipment

Compressor type & Q’ty

– RM-B5077MD1 [Rotary type] × 1

Motor kW – 0.90

Starting method – Line starting Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing Refrigerant control Capillary tubes + Electronic expansion valve Refrigerant

(3)

kg R410A 1.1 (Pre-Charged up to the piping length of 15m)

Refrigerant oil R 0.35 (MA68) Deice control Microcomputer control

Air handling equipment

Fan type & Q’ty

Tangential fan × 1 Propeller fan × 1

Motor W 29 24

(Cooling) 8.9 34

Air flow (at High)

(Heating)

CMM

10.3 34

Air filter, Q’ty

Polypropylene net (washable) × 2

–

Shock & vibration absorber – Cushion rubber (for compressor) Electric heater –– Operation control

Operation switch

Wireless-Remote controller –

Room temperature control Microcomputer thermostat – Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)

Safety equipment

O.D mm (in) Liquid line: φ6.35 (1/4″) Gas line: φ9.52 (3/8″)

Connecting method Flare connecting

Attached length of piping Liquid line: 0.47 m

Gas line : 0.40 m

–

Insulation Necessary (Both sides)

Drain hose Connectable Power source cord 2.5 m (3 cores with Earth)

Size × Core number 1.5 mm2 × 4 cores (Including earth cable)

Connection wiring

Connecting method Terminal block (Screw fixing type)

Accessories (included)

Mounting kit, Clean filter (Natural enzyme filter x1, Photocatalytic washable deodorizing filter x1)

Optional parts –

Notes (1) The data are measured at the following conditions.

Model SRK35ZD-S1 (Indoor unit)

SRC35ZD-S1 (Outdoor unit)

Item Indoor air temperature Outdoor air temperature

Standards

Operation DB WB DB WB

Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612

Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612

(2) The operation data are applied to the 220/230/240V districts respectively.

(3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.

(Purging is not required even for the short piping.)

Operation data

(1)

Refrigerant

piping

The piping length is 7.5m.

(220/230/240V)

Model SRK50ZD-S1 (Indoor unit)

SRC50ZD-S1 (Outdoor unit)

Item

Model

SRK50ZD-S1 SRC50ZD-S1

Cooling capacity

(1)

W 5000 (600~5300)

Heating capacity

(1)

W 6300 (600~7900)

Power source 1 Phase, 220-240V, 50Hz

Cooling input kW 1.66 (0.12~2.1)

Running current (Cooling) A 7.6/7.3/7.0

Heating input kW 1.96 (0.11~2.71)

Running current (Heating) A 9.0/8.6/8.2

Inrush current A 9.0/8.6/8.2

COP Cooling: 3.01 Heating: 3.21

Cooling

Sound level Hi 48, Me 42, Lo 26 48

Noise level

Power level

61 61

Heating

Sound level Hi 46, Me 40, Lo 34 50

Power level 62 64

Exterior dimensions

Height × Width × Depth

250 × 815 × 249 640 × 850 × 290

Color Cool white Stucco white Net weight kg 9.0 43 Refrigerant equipment

Compressor type & Q’ty

– 5CS102XFA [Scroll type] × 1

Motor kW – 1.5

Starting method – Line starting Heat exchanger Slit fins + Louver fins & inner grooved tubing Straight fins & inner grooved tubing Refrigerant control Capillary tubes + Electronic expansion valve Refrigerant

(3)

kg R410A 1.35 (Pre-Charged up to the piping length of 15m)

Refrigerant oil R 0.36 (RB68A) Deice control Microcomputer control

Air handling equipment

Fan type & Q’ty

Tangential fan × 1 Propeller fan × 1

Motor W 29 34

(Cooling) 11.5 42

Air flow (at High)

(Heating)

CMM

13.0 42

Air filter, Q’ty

Polypropylene net (washable) × 2

–

Shock & vibration absorber – Cushion rubber (for compressor) Electric heater –– Operation control

Operation switch

Wireless-Remote controller –

Room temperature control Microcomputer thermostat – Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)

Safety equipment

O.D mm (in) Liquid line: φ6.35 (1/4″) Gas line: φ12.7 (1/2″)

Connecting method Flare connecting

Attached length of piping Liquid line: 0.47 m

Gas line : 0.40 m

–

Insulation Necessary (Both sides)

Drain hose Connectable Power source cord 2.5 m (3 cores with Earth)

Size × Core number 1.5 mm2 × 4 cores (Including earth cable)

Connection wiring

Connecting method Terminal block (Screw fixing type)

Accessories (included)

Mounting kit, Clean filter (Natural enzyme filter x1, Photocatalytic washable deodorizing filter x1)

Optional parts –

Notes (1) The data are measured at the following conditions.

Item Indoor air temperature Outdoor air temperature

Standards

Operation DB WB DB WB

Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612

Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612

(2) The operation data are applied to the 220/230/240V districts respectively.

(3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.

(Purging is not required even for the short piping.)

If the piping length is longer, when it is 15 to 25m, add 20 g refrigerant per meter.

Operation data

(1)

Refrigerant

piping

The piping length is 7.5m.

(220/230/240V)

(2) Range of usage & limitations

(3) Exterior dimensions

(a) Indoor unit

Models SRK20ZD-S1, 25ZD-S1, 35ZD-S1, 50ZD-S1

Indoor return air temperature (Upper, lower limits)

Refrigerant line (one way) length Max. 15m

SRK20ZD-S1, 25ZD-S1, 35ZD-S1 SRK50ZD-S1

Cooling operation : Approximately 21 to 32˚C Heating operation : Approximately 15 to 30˚C

Cooling operation : Approximately 21 to 43˚C Heating operation : Approximately

5 to 21˚C

Power source voltage Rating ± 10%

Voltage at starting Min. 85% of rating

Frequency of ON-OFF cycle

Max. 7 times/h

(Inching prevention 5 minutes)

Max. 4 times/h

(Inching prevention 10 minutes)

ON and OFF interval Max. 3 minutes

Outdoor air temperature (Upper, lower limits)

Vertical height difference between outdoor unit and indoor unit

Max. 10m (Outdoor unit is higher) Max. 10m (Outdoor unit is lower)

Max. 25m

Max. 15m (Outdoor unit is higher) Max. 15m (Outdoor unit is lower)

Item

Models

VIEW A

117.5

580 117.5

148.5

216.5216.5

8.2

44.5

236.1

5.7

450

67.5

42.7

47.2

175

44.5

216.5216.5

148.5

53.5

Piping for Gas

Drain hose 540 (ø16)

Piping for Liquid 465.1 (ø6.35)

Piping hole (ø65)

( )

20,25,35: ø9.52 50:

12.7

397.1

14.5

788

815

250

Unit: mm

Piping hole right(left)

Terminal block

249

150

Remote controller

(b) Outdoor unit

Models SRC20ZD-S1, 25ZD-S1, 35ZD-S1

Drain holes

286.4

290

49.6

43.5

850

203.1

510 136.9

476

2-16x12

314

328

Terminal block

Service valve (Liquid)

ø6.35 (1/4'')

Service valve (Gas)

ø12.7 (1/2'')

Ground terminal

124

34.6

20û

42.7

100.3

640

Model SRC50ZD-S1

Unit: mm

290

540

14.4

47.4 42.6

264.5

404.5

510

720

17.8

Drain holes

39.7

99.9

340

312.5

13.5

139

2-16 x12

61.9

139.3 33.3

Flare connection ø6.35 (1/4")

Service valve (Liquid)

Flare connecting ø9.52 (3/8")

Service valve (Gas)

Terminal block

(4) Piping system

Models SRK20ZD-S1, 25ZD-S1, 35ZD-S1

Outdoor unitIndoor unit

Room temp. sensor

Heat exchanger

Flare connection

Heat exchanger sensor

Piping (Liquid) ø6.35

Check joint

4 way valve

Service valve (Liquid)

Flare connetion

Discharge pipe temp. sensor

Cooling cycle

Heating cycle

Outdoor air temp. sensor

Heat exchanger

Heat exchanger sensor

Compressor

Capillary tube

Strainer

Accumulator

Service valve (Gas)

Electronic expansion valve

Piping (Gas) ø9.52

Model SRK50ZD-S1

Outdoor unitIndoor unit

Room temp. sensor

Heat exchanger

Flare connection

Heat exchanger sensor

Piping (Liquid) ø6.35

Check joint

4 way valve

Service valve (Liquid)

Flare connection

Discharge pipe temp. sensor

Cooling cycle

Heating cycle

Outdoor air temp. sensor

Heat exchanger

Heat exchanger sensor

Compressor

Capillary tube

Strainer

Service valve (Gas)

Capillary tube

Electronic expansion valve

Piping (Gas)

ø12.7

Muffler

Capillary tube

Muffler

(5) Selection chart

Correct the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity can be

obtained in the following way.

Net capacity = Capacity shown on specification ✕ Correction factors as follows.

(a) Coefficient of cooling and heating capacity in relation to temperatures

(b) Correction of cooling and heating capacity in relation to one way length of refrigerant piping

It is necessary to correct the cooling and heating capacity in relation to the one way piping length between the indoor and outdoor units.

In additions to the foregoing corrections (a), (b) the heating capacity needs to be adjusted also with respect to the frosting on the outdoor heat exchanger.

How to obtain the cooling and heating capacity

Example : The net cooling capacity of the model SRK20ZD-S1 with the piping length of 15m, indoor wet-bulb temperature at 19.0˚C

and outdoor dry-bulb temperature 35˚C is Net cooling capacity = 2000 ✕ 0.975 ✕ 1.0 = 1950 W

Length 15m

Factor by air temperatures

ISO-T1 Standard ConditionOutdoor air W.B. temperature ˚C W.B.

1005-5

16 18 20 22 24

ISO-T1 Standard ConditionIndoor air W.B. temperature ˚C W.B.

Heating

Applicable range

27 25

20 15

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Cooling

Heating operation

Indoor air D.B.

temperature

˚C D.B.

Cooling operation

Outdoor air D.B.

temperature

˚C D.B.

Coefficient of cooling &

Heating capacity in

relation to temperature

Piping length [m]

Cooling

Heating

1.0

0.99

1.0

0.975

1.0

0.965

1.0

0.95

1.0

Air inlet temperature of

outdoor unit in ˚C WB

Adjustment coefficient

-5

0.91-30.88-10.8610.8730.9251.00

SRK20ZD-S1

1.1.3 ELECTRICAL DATA

(1) Electrical wiring

Models SRK20ZD-S1, 25ZD-S1, 35ZD-S1

Power source

1 Phase

220/230/240V 50Hz

Outdoor unit

Indoor unit

HEAT

EXCHANGER

Printed circuit

board

Printed circuit board

Y/GN

CNU

TB TB

F2 (250V 20A)

250V

3.15A

C2 S.IN R.IN

Y/GN

ZNR

CNM

CNE CNG

52C3

52C

52C4

Th4

Th1 Th2

Th5

Th6

CNB

CNE

CNA

CND

Power

transistor

20S

52C

EEV

FMo

( )

Display

Wireless

R-Amp

Black

Brown

Red

Blue

White

Yellow/Green

Y/GN

Color symbol

Meaning of marks

Symbol

Parts name

Compressor motor

Fuse

Fan motor (Indoor)

FMo

an motor (Outdoor)

Flap motor

Reactor

Symbol

Parts name

Room temp. sensor

Heat exchanger

sensor

(Indoor unit)

Heat exchanger

sensor

(Outdoor unit)

Outdoor air temp. sensor

ZNR

Dischar

Varistor

ge pipe temp. sensor

Symbol

Parts name

20S

4 way valve (coil)

52C

Magnetic contactor

Diode stack

EEV

Electronic expansion valve

Power source

1 Phase

220/230/240V 50Hz

Outdoor unit

Indoor unit

HEAT

EXCHANGER

Printed circuit board

BRBLY/GN

250V

3.15A

ZNR

CNM

CNE CNG CNF

52C3

52C

52C4

52C

( )

Display

Wireless

R-Amp

Th1 Th2

Th3

13456

CNU

Black

Brown

Red

Blue

White

Yellow/Green

BKBRRD

Orange

Green

Y/GN

Color symbol

Meaning of marks

Symbol

Parts name

CFo

Capacitor for FMo

Compressor motor

Fuse

Fan motor (Indoor)

FMo

an motor (Outdoor)

Flap motor

Inspection lamp

Inductor

Symbol

Parts name

Room temp. sensor

Heat exchanger sensor (Indoor unit)

Humidity sensor

Heat exchanger sensor (Outdoor unit)

Outdoor air temp. sensor

Discharge pipe temp. sensor

Symbol

Parts name

ZNR

Varistor

20S

4 way valve (coil)

52C

Magnetic contactor

Diode stack

EEV

Electronic expansion valve

















 







 

 

EEV

















FMo

20S

F(250V 15A)









 













 

 











 



















"#













Model SRK50ZD-S1

MED

AUTO

HI POWER

ECONO

ON OFF

AM PM

FAN SPEED button

Each time the button is pushed, the indicator is switched over in turn.

• The above illustration shows all controls, but in practice

only the relevant parts are shown.

OPERATION MODE select button

Each time the button is pushed, the indicator is switched over in turn.

AIR FLOW button

This button changes the flap mode. When pressed, this button changes the mode in the following order:

ON/OFF button

Press for starting operation, press again for stopping.

HI POWER button

This button changes the HI POWER mode.

ECONOMY button

This button changes the ECONOMY mode.

RESET switch

Switch for resetting microcomputer.

ON TIMER button

This button selects ON TIMER operation.

TIME switch

This switch for setting the time.

OFF TIMER button

This button selects OFF TIMER operation.

TEMPERATURE button

This button sets the room temperature. (This button changes the present time and

TIMER time.)

CANCEL button

This button cancels the ON timer and OFF timer.

RESERVE button

This button sets the present time and TIMER time.

S Indication section

OPERATION MODE indicator

Indicates selected operation with lamp.

[

(Auto) • (Cool) • (Heat) • (Dry)]

TEMPERATURE indicator

Indicates set temperature. (Does not indicate temperature when operation

mode is on AUTO)

FAN SPEED indicator

Indicates set air flow rate with lamp.

AIR FLOW indicator

Shows selected flap mode.

HI POWER MODE indicator

Indicates during Hi power mode operation.

ECONOMY MODE indicator

Indicates during economy mode operation.

ON TIMER indicator

Indicates during ON TIMER operation.

TIME indicator

Indicates present time or timer setting time.

OFF TIMER indicator

Indicates OFF TIMER operation.

Models All models

Remote controller

S Operation section

1.1.4

OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

(1) Operation control function by remote control switch

(Air scroll) (Swing)

(Flap stopped)

Unit indication section

Models SRK20ZD-S1, 25ZD-S1, 35ZD-S1, 50ZD-S1

(2) Unit ON/OFF button

When the remote controller batteries become weak, or if the remote controller is lost or malfunctioning, this button may be used to turn

the unit on and off.

(a) Operation

Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off.

(b) Details of operation

The unit will go into the automatic mode in which it automatically determines, from room temperature (as detected by sensor),

whether to go into the cooling, thermal dry or heating modes.

Function

Room temperature

Operation mode

setting

Fan speed Flap Timer switch

Cooling About 25ºC

Thermal dry About 25ºC Auto Auto Continuous

Heating About 26ºC

Unit ON/OFF button

ECONOMY light (orange)

Illuminates during ECONOMY operation.

TIMER light (yellow)

Illuminates during TIMER operation.

HI POWER light (green)

Illuminates during HI POWER operation.

RUN (HOT KEEP) light (green)

• Illuminates during operation.

• Flashes at air flow stop due to the ‘HOT KEEP’.

(3) Power blackout auto restart function

(a) Power blackout auto restart function is a function that records the operational status of the air-conditioner immediately prior to it

being switched off by a power cut, and then automatically resumes operations at that point after the power has been restored.

(b) The following settings will be cancelled:

(i) Timer settings

(ii) High-power operations

Notes (1) The power blackout auto restart function is set at on when the air-conditioner is shipped from the

factory. Consult with your dealer if this function needs to be switched off.

(2) When power failure ocurrs, the timer setting is cancelled. Once power is resumed, reset the timer.

(3)

If the jumper wire (J7) “REMOTE/AUTORESTART” is cut, auto restart is disabled. (See the diagram

at right)

Models SRK20ZD-S1, 25ZD-S1, 35ZD-S1, 50ZD-S1

Jumper wire (J7)

(4) Flap control

Control the flap by AIRFLOW button on the wireless remote control.

(a) Air scroll (AUTO)

The flap will be automatically set to the angle of air flow best to operation.

(i) Starting time of operation

Flap moves in upward and downward directions continuously.

(ii) When not operating

The flap returns to the position of air flow directly below, when operation has stopped.

(b) Memory flap

While the flap is operating if the AIRFLOW button is pushed once, it stops swinging at an angle.

As this angle is memorized in the microcomputer, the flap will be automatically set to the angle when next operation is started.

¡ Recommendable stopping angle of the flap

Corrects the starting time of next operation by calculating the temperature difference.

(Example) Heating

Setting temperature

Room temperature

Operation starting time

Time

Setting time

15 min. 10 min. 5 min. earlier earlier earlier

¡ If the difference (= Setting temperature – Room tempera-

ture) is 4ºC, the correction value is found to be +5 minutes from the table shown above so that the starting time of next operation is determined as follows:

15 min. earlier + 5 min. = 20 min. earlier

↑↑

Current operation Correction value start time

During cooling and

dry operation

Thick line : Rapid movement

Thin line : Slow movement

Stops for approximately 5 seconds in the horizontal position.

During heating

operation

Stops for approximately 5 seconds in this position.

Thick line : Rapid movement

Thin line : Slow movement

Horizontal blowing

COOL•DRY

Slant forward blowing

HEAT

(5) Comfortable timer setting

If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation

is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the

relationship between the room temperature at the setting time (temperature of room temperature sensor) and the setting temperature.

(Max. 60 minutes)

Operation mode Operation start time correction value (Min.)

3 < Room temp. – Setting temp. 1 < Room temp. – Setting temp.

3 Room temp. – Setting temp.

At cooling

+5 No change –5

3 < Setting temp. – Room temp. 2 < Setting temp. – Room temp.

3 Setting temp. – Room temp.

At heating

+5 No change –5

Notes (1) At 5 minutes before the timer ON time, operation starts regardless of the temperature of the room temperature sensor (Th1).

(2) This function does not operate when in the Dry or Auto Dry mode.

However, the operation in item (1) does operate in the Auto Dry mode.

(3) During the comfortable timer operation, both the RUN light and TIMER light illuminate and the TIMER light goes off after expiration of the timer, ON setting

time.

(iii) Hot keep operation

If the hot keep operation is selected during the heating operation, the indoor blower is controlled based on the temperature of the indoor unit heat exchanger (detected with Th2, indoor unit heat exchanger sensor) to prevent blowing of cool wind.

Note (1) Refer to the table shown above right for the values A and B.

¡ Normal mode (Normal heating operation, operation after HI POWER completion)

Indoor heat exchanger temp. (˚C)

¡ Values of A, B

At 0 rps command 22 25

Other than 0 rps

17 19

command

20~35: 23°C

50: 20°C

28 29.5 31.5 34 36 37.5 39 40

1st speed

3rd speed

4th speed

5th speed

6th speed

7th speed

OFF

Indoor fan

(i) Fuzzy operation

Deviation between the room temperature setting correction temperature and the suction air temperature is calculated in accordance with the fuzzy rule, and used for control of the air capacity and the inverter speed.

(ii) Heating thermostat operation

¡ Operating conditions

If the speed obtained with the fuzzy calculation drops below -24 rps during the heating fuzzy operation, the operation changes to the heating thermostat operation.

¡ Detail of operation

(6) Outline of heating operation

(a) Operation of major functional components in heating mode

(b) Air flow selection

(i) Speed of inverter changes within the range of selected air flow.

(ii) When the defrosting, protection device, etc. is actuated, operation is performed in the corresponding mode. (iii) Outdoor unit blower operates in accordance with the inverter command speed.

Model

SRK20, 25, 35ZD-S1 SRK50ZD-S1

Item Inverter speed 0rps [Comp. stopped] 10 rps [10sec.] → 0rps [Comp. stopped] Indoor fan Hot keep normal mode → 1st speed Outdoor fan Stop 2nd speed [1min.] → stop

Flap Horizontal

Auto

MED

Item

Indoor fan motor ON ON OFF

Flaps ON or OFF ON or OFF Stop position control

Display Lights up Lights up Lights up or flashes

52C ON ON OFF after stop mode

Outdoor fan motor

OFF (20, 25, 35 type)

Depending on the stop mode (50 type) Depending on the stop mode (50 type)

4-way valve

Depending on the stop mode

Electronic expansion valve Depending on the EEV control

When the inverter

speed is 0rps

When the inverter speed

is other than 0rps

When the inverter speed is 0rps

due to an anomalous stop

Functional components

(20, 25, 35 only)

8th speed

(20, 25, 35 only)

9th speed

Model

SRK20ZD-S1 SRK25ZD-S1 SRK35ZD-S1 SRK50ZD-S1

Air flow selection

Inverter command speed 30~100rps 30~102rps 15~120rps

Air flow Depends on inverter command speed.

Inverter command speed 30~100rps 30~102rps 15~120rps

Air flow 8th speed fixed 6th/7th speed

Inverter command speed 30~72rps 30~72rps 30~76rps 15~62rps

Air flow 6th speed fixed 4th/5th speed

Inverter command speed 30~42rps 30~42rps 30~46rps 15~38rps

Air flow 4th speed fixed 3rd speed fixed

Notes (1) Refer to the table shown above right for the values A and B.

Note (2) Values in ( ) are for type 20, 25, 35.

¡ Hot keep M mode [During HI POWER operation (for 15 min.)]

Indoor heat exchanger temp. (˚C)

AB2931 32 34 36 43

(40)

(43) (47)

1st speed

3rd speed

4th speed

5th speed

6th speed

7th speed

OFF

Indoor fan

(iv) Defrosting operation

1) Starting conditions (Defrosting operation can be started only when all of the following conditions are met.)

1 After start of heating operation → When it elapsed 35 minutes. (Accumulated operation time) 2 After end of defrosting operation → When it elapsed 35 minutes. (Accumulated compressor operation time) 3 Outdoor unit heat exchanger sensor (Th4) temperature → When the temperature has been below –5ºC for 3 minutes

continuously.

4 When the temperature difference between the outdoor air sensor temperature and the outdoor unit heat exchanger

sensor temperature exceeded 20. 25 type: 7.0°C, 35 type: 5.0°C, 50 type: 4.0°C

5 During continuous compressor operation

In addition, when the speed command from the indoor controller of the indoor unit during heating operation has

counted 0 rps 10 times or more and all conditions of 1, 2 and 3 above are satisfied (note that when the temperature for Th4 is -5°C or less: 62 rps or more, -4°C or less: less than 62 rps), defrost operation is started.

2) Operation of functional components during defrosting operation

¡ 20, 25, 35 type

Indoor fan

RUN light

Corresponding to speed

OFF

Flashing

(Hot keep)

Outdoor fan

Inverter command

Fuzzy calculated

value

70 rps

Corresponding

to speed

OFF

(1)

4-way valve

Final defrost operation

Defrost control

Hot keep

Indoor unit

Outdoor unit

60 sec.

Hot keep

50 sec.

Normal heating operation restored

Defrost end

(Th4

13˚C, 10 minutes)

Defrost operation

Defrost operation preparation

6th speed 6th speed

¡ Values of A, B

At 0 rps command 22 25

Other than 0 rps

17 19

command

8th speed

9th speed

(20, 25, 35 only)

Note (1) When outdoor unit heat exchanger sensor (Th4) temperature becomes 2°C or higher, inverter command changes 70 rps to 50

rps.

(v) Heating “HI POWER” operation (HI POWER button on remote controller: ON)

Operation is maintained for 15 minutes with a higher blow out air temperature.

¡ Detail of operation

Model

SRK20ZD-S1 SRK25, 35ZD-S1 SRK50ZD-S1

Item

Inverter speed 100 rps 102 rps 120 rps

Indoor fan Hot keep M mode (max 8th speed) Hot keep M mode (max 7th speed)

Outdoor fan 4th speed 2nd speed

Notes (1) Room temperature is not adjusted during the HI POWER operation.

(2) Protective functions will actuate with priority even during the HI POWER operation.

3) Ending conditions (Operation returns to the heating cycle when either one of the following is met.)

1 Outdoor heat exchanger sensor (Th4) temperature: 13ºC or higher (50 type: 20°C or higher) 2 Continued operation time of defrosting → For more than 10 min.

Indoor fan

RUN light

Corresponding to speed

OFF

Flashing

(Hot keep)

Outdoor fan

Inverter command

Fuzzy calculated

value

70 rps

(1)

Corresponding

to speed

OFF

4-way valve

Final defrost operation

Defrost control

Hot keep

Indoor unit

Outdoor unit

75 sec.

Hot keep

60 sec.

Normal heating operation restored

Defrost end

(Th4

20°C, 10 minutes)

Defrost operation

Defrost operation preparation

2nd speed 2nd speed

(7) Outline of cooling operation

(a) Operation of major functional components in Cooling mode

¡ 50 type

Item

Indoor fan motor ON ON OFF

Flaps ON or OFF ON or OFF Stop position control

Display Lights up Lights up Lights up or flashes

52C ON ON OFF after stop mode

Outdoor fan motor

OFF (20, 25, 35 type)

Depending on the stop mode (50 type) Depending on the stop mode (50 type)

4-way valve

Depending on the stop mode

Electronic expansion valve Depending on the EEV control

When the inverter

speed is 0rps

When the inverter speed

is other than 0rps

When the inverter speed is 0rps

due to an anomalous stop

Functional components

Note (1) When outdoor unit heat exchanger sensor (Th4) temperature becomes 7°C or higher, inverter instruction changes 70 rps to 50

rps.

(i) Fuzzy operation

During the fuzzy operation, the air flow and the inverter speed are controlled by calculating the difference between the room

temperature setting correction temperature and the suction air temperature.

(ii) Cooling thermostat operation

1) Operating conditions

During the cooling fuzzy operation or when the speed obtained by the fuzzy calculation is less than -24 rps.

2) Detail of operation

(b) Air flow selection

(i) Speed of inverter changes within the range of selected air flow.

(ii) When any protective function actuates, the operation is performed in the mode corresponding to the function.

(iii) Outdoor blower is operated in accordance with the inverter command speed.

(iii) Cooling “HI POWER” operation (HI POWER button on remote controller: ON)

The unit is operated continuously for 15 minutes regardless of the setting temperature.

1) Detail of operation

Model

SRK20, 25, 35ZD-S1 SRK50ZD-S1

Item Inverter speed 0 rps [Comp. stopped] 10rps [10sec.] → 0rps [Comp. stopped]

Indoor fan Corresponds to fan speed switch. Outdoor fan Stop 2nd speed [1min.] → stop

Notes (1) Protective functions will actuate with priority even during the “HI POWER” operation.

(2) Room temperature is not adjusted during the “HI POWER” operation

(8) Outline of dehumidifying operation

(a) After operating the indoor blower for 20 seconds from immediately after the start of operation, the indoor temperature is checked

and, based on the result of check, the cooling oriented dehumidifying or heating oriented dehumidifying is selected.

Heating oriented dehumidifying Cooling oriented dehumidifying

Low –3 High

Room temperature - Setting temperature (deg)

Cooling or heating oriented dehumidifying is selected again one hour after the first selection of the cooling or heating oriented

dehumidifying.

Auto

MED

Model

SRK20ZD-S1 SRK25ZD-S1 SRK35ZD-S1 SRK50ZD-S1

Air flow selection

Inverter command speed 20~60rps 20~70rps 20~98rps 15~90rps

Air flow Depends on inverter command speed.

Inverter command speed 20~60rps 20~70rps 20~98rps 15~90rps

Air flow 7th speed fixed 5th~7th speed

Inverter command speed 20~52rps 20~58rps 15~60rps

Air flow 5th speed fixed 3rd~5th speed

Inverter command speed 20~34rps 20~38rps 15~30rps

Air flow 2nd speed fixed

Model

SRK20ZD-S1 SRK25ZD-S1 SRK35ZD-S1 SRK50ZD-S1

Item

Inverter speed 60 70 98 90

Indoor fan 7th speed

Outdoor fan 4th speed 2nd speed

D range C range B range A range

(ii) Heating oriented dehumidifying

After interrupting the compressor operation for 3 minutes (by the 3-minute timer) following the determination of heating

oriented dehumidifying, the unit begins in the heating operation. If the room temperature exceeds the setting temperature by

2ºC or more, the unit checks the room temperature at 5-minute intervals and, depending on the result, determines the range

of heating oriented dehumidifying operation.

Operation range

DCBA

Low –1 0 +2 High

Room temperature – Setting temperature (deg)

(D) (C) (C) (B)

OFF

3rd speed

25 sec.

OFF

20, 25, 35 type : 38

50 type : 24

20, 25, 35 type : 50

50 type : 40

50 type : 4th speed

20, 25, 35 type : 30

50 type : 15

5th speed

2nd speed

1st speed

50 type : 1st speed

Inverter speed

Indoor fan

Outdoor fan

Determination of cooling oriented dehumidifying operation range

Temperature check

5 min. 5 min. 5 min. 5 min.

Operation pattern

OLM

Low –1 0 High

Room temperature – Setting temperature (deg)

Operation range

Heating operation O range L range M range

4th speed

OFF

3rd speed

OFF

4th speed

2nd speed

1st speed

20, 25, 35 type : 38

50 type : 28

20, 25, 35 type : 30

50 type : 15

20, 25, 35 type : 48

50 type : 44

50 type : 1st speed

25 sec.

50 type : 1st speed

Inverter speed

Indoor fan

Outdoor fan

Determination of heating oriented dehumidifying operation range

Temperature check

5 min. 5 min. 5 min.

Depends on the operation condition

Operation pattern

Note (1) Figures in the parentheses

( ) show the values at economical operation.

Note (1) Figures in the parentheses

( ) show the values at economical operation.

(b) Outline of control

(i) Cooling oriented dehumidifying

Room temperature is checked at 5-minute intervals after selecting the cooling or heating oriented dehumidifying in order to

determine the operation range.

(O) (L) (L)

(9) Outline of automatic operation

(a) Determination of operation mode

The unit checks the room temperature and the outdoor air temperature after operating the indoor and outdoor blowers for 20

seconds, determines the operation mode and the room temperature setting correction value, and then begins in the automatic

operation.

Heating

Dehumidifying

Cooling

Room temperature (˚C)

Outdoor temperature (˚C)

27.5

25.5

19.5

(b) The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the previous

operation mode, changes the operation mode.

(c) When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is selected

during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.

(d) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the signals of

the wireless remote controller and the setting temperature.

Signals of wireless remote controller (Display)

–6 –5 –4 –3 –2 –1 ±0+1+2+3+4+5+6

Setting

Cooling 19 20 21 22 23 24 25 26 27 28 29 30 31

temperature

Dehumidifying 19 20 21 22 23 24 25 26 27 28 29 30 31

Heating 20 21 22 23 24 25 26 27 28 29 30 31 32

(10) Economical operation

(ECONO button on remote controller: ON)

(a) The set temperature is raised by 1.5ºC (0.5ºC every one hour) at cooling operation and lowered by 2.5ºC (Steps of 1ºC, 1ºC and

0.5ºC every one hour) at heating operation to continue the operation with the following contents.

(b) Detail of operation

(11) Protective control function

(a) Frost prevention for indoor heat exchanger (During cooling or dehumidifying)

(i) Operating conditions

1) Indoor heat exchanger temperature (detected with Th2) is lower than 5ºC.

2) 10 minutes after reaching the inverter command speed except 0 rps.

(ii) Detail of anti-frost operation

5°C or lower 2.5°C or lower

Item

Upper limit speed

20, 25 : 44 rps

0rps

35, 50 : 70 rps

Indoor fan Depends on operation mode

20, 25, 35: Max 2nd

50: 2nd

Outdoor fan Depends on operation mode OFF

4-way valve OFF Depends on stop mode

(iii) Reset conditions: The indoor heat exchanger temperature (Th2) is 8ºC or higher after 5 minutes of operation following

control of the inverter command speed upper limit.

Model

SRK20, 25ZD-S1 SRK35ZD-S1 SRK50ZD-S1

Item

Operation mode Cooling Heating Cooling Heating Cooling Heating

Inverter command speed 20~52rps 20~72rps 20~58rps 20~76rps 15~60rps 15~62rps

Indoor fan 2nd, 5th speed 4th, 6th speed 2nd, 5th speed 4th, 6th speed 3rd~5th speed 4th, 5th speed

Outdoor fan 3rd speed 1st speed

Indoor heat exchanger

temperature

Indoor heat exchanger

temperature (°C)

2.5 5 8

0 rps

Upper

limit

speed

Inverter

command

speed

(b) Indoor fan motor protection

When the air conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300 rpm or

under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system.

TIMER light illuminates simultaneously and the RUN light flashing 6 times at each 8-second.

◆ SRK20, 25, 35ZD-S1

(i) Operating conditions: When compressor is kept ON for 30 min. after the unit starts operation.

(ii) Operation contents

(iii) Reset conditions: When compressor is off. (ex. thermo becomes OFF, operation mode is changed)

◆ SRK50ZD-S1

(i) Operating conditions: When the following conditions are met after 20 minutes or more of continuous operation after

operation starts.

1 The command speed is 28 rps or higher

2 The humidity sensor value is 68% or higher

(ii) Operation contents

(iii) Reset conditions: When either of the following conditions is satisfied.

1 The command speed is lower than 28 rps.

2 The humidity sensor value is less than 63%.

(d) Prevention of continuous low speed operation: For oil return to compressor

(i) Operating conditions: When command speed of less than 30(26) rps continues for 8(60) minutes

(ii) Detail of operation: The unit is operated at command speed of 30 rps forcibly for 15 seconds. (The indoor and outdoor

fans are not changed.)

Notes (1) When the command of exceeding 30 rps is directed during 30 rps forced operation, the unit follows it.

Note (2) Values in ( ) are for Type 50.

(e) Compressor protection start

(i) When the indoor unit calculated speed is 64 rps or over at operation start, the unit is operated with 64 rps for 1 minute and 45

seconds. (All models) After that when the calculated speed is 96 rps or over, the unit is operated with 96 rps for 5 minutes

then moved to command speed. (50 type only)

(ii) At thermo operation (OFF → ON) this control is not executed.

(iii) The indoor unit fan corresponds to the command speed of each operation mode.

Note (1) When the calculated speed is less than 64 rps, the unit is started with low load starting described in article (f).

(f) Low load starting

(i) When the unit is started with calculated speed of less than 60(30) rps, it is operated with 60(30) rps for 80(60) seconds, then

the operation is moved to the command speed.

(ii) The indoor fan corresponds to the operation mode.

Cooling: Speed corresponding to the command speed of air flow switching

Dehumidification: Speed decided in the operation region

Heating: The lower one between the speed corresponding to the command speed and the hot keep speed

Note (1) Values in ( ) are for Type 50.

Type

SRK20ZD-S1 SRK25ZD-S1 SRK35ZD-S1

Item

Upper limit speed 60 rps 62 rps 86 rps

Type

SRK50ZD-S1

Item

Fan Speed Medium Indoor fan speed 4th speed

Fan Speed Low Indoor fan speed 4th speed

Other Settings Indoor fan speed Corresponding to command speed

Humidity (%)

68 73

50 rps

30 rps

Inverter command speed at upper limit

(g) Inching prevention

When the compressor goes into the thermo operation within 10(5) minutes since operation start or becomes various dehumidifying

operations, the operation is continued with the command speed of 20(15) rps forcibly.

Note (1) Values in ( ) are for Type 50.

(h) Current safe

(i) Purpose: Current is controlled not to exceed the upper limit of the setting operation current.

(ii) Detail of operation: Input current to the converter is monitored with the current sensor fixed on the printed circuit board

of the outdoor unit and, if the operation current value reaches the limiting current value, the inverter speed is reduced.

If the mechanism is actuated when the speed of outdoor unit is less than 30 rps, the compressor is stopped immediately.

Operation starts again after a delay time of 3 minutes.

(i) Current cut

(i) Purpose: Inverter is protected from overcurrent.

(ii) Detail of operation: Output current from the converter is monitored with a shunt resistor and, if the current exceeds the

setting value, the compressor is stopped immediately. Operation starts again after a delay time of 3 minutes.

(j) Heating overload protective control

(i) Operating conditions : When the unit is operating with the outdoor unit speed other than 0 rps or when the outdoor air

temperature (detected by Th5) rose beyond 17ºC for 30 seconds continuously.

(ii) Detail of operation

1) Indoor fan speed is raised forcibly by 1 step.

2) Taking the upper limit of control speed range at 60 rps, if the output speed obtained with the fuzzy calculation exceeds the

upper limit, the upper limit value is maintained.

3) The outdoor fan is set on 2nd speed. (20, 25, 35 types only)

4) The lower limit of control speed is set to 40(35) rps and even if the calculated result becomes lower than that after fuzzy

calculation, the speed is kept to 40(35) rps. However, when the thermo becomes OFF, the speed is reduced to 0 prs.

(iii) Reset conditions: When the outdoor air temperature drops below 16ºC.

Note (1) Values in ( ) are for Type 50.

(k) Cooling overload protective control

(i) Operating conditions: When the outdoor unit is operating with the speed of other than 0 rps, or when the outdoor air

temperature (detected by Th5) becomes 41ºC or over for 30 seconds continuously.

(ii) Detail of operation

1) Outdoor fan is stepped up by 3(1) speed step.

2) The lower limit of control speed is set to 30 rps and even if the calculated result becomes lower than that after fuzzy

calculation, the speed is kept to 30 rps. However, when the thermo becomes OFF, the speed is reduced to 0 rps.

3) The upper limit of control speed is 72 rps.

(iii) Restoration condition: When the outdoor air temperature becomes 40ºC or less

Note (1) Values in ( ) are for Type 50.

(l) Freezing cycle system protective control

(i) Operating conditions: When both of following conditions have continued for more than 5 minutes later than 5 minutes

after the start of operation.

1) Command speed is higher than 60 rps

2) During cooling, dehumidifying: Indoor heat exchanger temperature - Room temperature > –4ºC

During heating: Indoor heat exchanger temperature - Room temperature < 6ºC

(ii) Detail of operation

The command speed repeats 30 minutes at 30rps ↔ 2 minutes at 62 rps.

(iii) Restoration conditions: When the condition becomes outside of either conditions 1) or 2) shown above

Note (1) This control is valid when the room air temperature is in the range of 10 to 40ºC at cooling and dehumidification operation and 0 to 40ºC at heating

operation.

Notes (1) When the discharge pipe temperature is in the range of 100(90) to 125(110)ºC, the speed is reduced by 4 rps.

(2) When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps.

(3) If the discharge pipe temperature is still 90 (80) ºC or greater but less than 100 (90) ºC even when the inverter command speed is maintained for 3

minutes when the temperature is 90 (80) ºC or greater but less than 100 (90) ºC, the speed is raised by 2 rps and kept at that speed for 3 minutes. This

process is repeated until the command speed is reached.

(4) Lower Limit Speed

Cooling Heating

20, 25, 35 type 20 30

50 type 22 38

(5) Values in ( ) are for Type 50.

2) If the temperature of 125 (110)ºC is detected by the sensor on the discharge pipe, then the compressor will stop immediately.

When the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts again within 1 hour but

there is no start at the third time.

(n) Serial signal transmission error protection

(i) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals. (ii) Detail of operation: When the indoor unit controller ↔ outdoor unit controller signals cannot be received, the compressor

is stopped immediately. Once the operation stops, it does not start any more.

(TIMER light on the indoor unit flashing at the same time.)

(o) High pressure control

(i) Purpose: Prevents anomalous high pressure operation during heating. (ii) Detector: Indoor unit heat exchanger sensor (Th2) (iii) Detail of operation:

(m) Compressor overheat protection

(i) Purpose: It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor

overheat.

(ii) Detail of operation

1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.

Discharge pipe temperature (˚C)

Lower limit

(4)

After lapse of 3 min. or over

(3)

After lapse of 3 min. or over

(3)

After lapse of 3 min. or over

(3)

4 rps

(1)

0 rps

(Example) Fuzzy

(80)

100 (90)

125 (110)

Notes (1) RPSmin: The lower one between the outdoor unit speed and the command speed

Note (2) Values in ( ) are for Type 50.

¡ Temperature list

ABC

RPSmin < 40(88) 48 (48.5) 53 (56) 58 (61)

40(88)

< =

RPSmin < 50(108)

48 (44) 53 (51.5) 58 (56.5)

50(108)

< =

RPSmin 48.5 (39) 56 (46.5) 61 (51.5)

(Example) Fuzzy

Indoor unit heat exchanger temperature (˚C)

Lower limit speed 20(35)rps

After lapse of 20 Sec. or over

(2)

After lapse of 20 Sec. or over

(2)

After lapse of 20 Sec. or over

(2)

8 rps

(1)

8 rps

0 rps

Notes (1) When the indoor unit heat exchanger temperature is in the range of B~C ºC, the speed is reduced by 8 rps at each 20 seconds. When the temperature is C

ºC or over for 1 minute continuously, the inverter is stopped.

(2) When the indoor unit heat exchanger temperature is in the range of A~B ºC, if the inverter command speed is been maintained and the operation has

continued for more than 20 seconds at the same speed, it returns to the normal heating operation.

(3) Indoor blower retains the fan tap when it enters in the high pressure control. Outdoor blower is operated in accordance with the speed.

Unit : ºC

(p) Heating low outdoor temperature protective control (50 type only)

◆ <I>

(a) Operating conditions: When the outdoor air temperature sensor (Th5) is 4ºC or lower continues for 5 minutes while the

outdoor speed is other than 0 rps.

(b) Operation content: When the command speed is less than 22 rps, the command speed is forcibly set at 22 rps.

◆ <II >

(a) Operating conditions: When the outdoor air temperature sensor (Th5) is 0ºC or lower continuously for 5 minutes while

the outdoor speed is other than 0 rps.

(b) Operation content: The outdoor fan motor speed is raised to the next higher speed. (Upper limit 2nd speed)

◆ <III>

(a) Operating conditions: When the temperature sensed by the outdoor heat exchanger sensor (Th4) becomes –10ºC or

lower continuously for 1 minute.

(b) Operation content: When the command speed upper limit is set at 70 rps.

(q) Stop mode

(i) Operating conditions: When the operation mode is changed, when the dehumidifying operation is changed from the

heating oriented mode to the cooling oriented mode or vice versa, or when the inverter speed turns to 0 rps. [When 0 rps is

commanded from the indoor unit controller, or when an outdoor protective function is actuated]

(ii) Detail of operation

◆ 20, 25, 35 type

When stopped by indoor unit controller When stopped or reset by outdoor unit protective function

Function Operation

Heating, heating Cooling, cooling Heating, heating Cooling, cooling oriented dehumidifying oriented dehumidifying oriented dehumidifying oriented dehumidifying

Stop Full stop Stop Full stop Stop Restart Stop Restart

(0 rps command) (0 rps command) (0 rps command) (0 rps command)

Inverter speed

Indoor fan

Indoor power relay

Outdoor fan

4-way valve

(Command

speed)

(Speed

dependent)

OFF

3 min.

(1)

3 min.

(1)

2 min. 2 min.

55 sec. 55 sec.

Hot keep

2 min.55sec.

OFF

1st speed

◆ 50 type

Note (1) When the start delay of compressor of indoor unit controller is actuated and the operation is reset, it takes 2 minutes and 55 seconds.

When stopped by indoor unit controller When stopped or reset by outdoor unit protective function

Function Operation

Heating, heating Cooling, cooling Heating, heating Cooling, cooling oriented dehumidifying oriented dehumidifying oriented dehumidifying oriented dehumidifying

Stop Full stop Stop Full stop Stop Restart Stop Restart

(0 rps command) (0 rps command) (0 rps command) (0 rps command)

Inverter speed

Indoor fan

Indoor power relay

Outdoor fan

4-way valve

(Command

speed)

(Speed

dependent)

OFF

3 min.

(1)

3 min.

(1)

3 min.

2 min.

55 sec.

Hot keep

2 min.55sec.

OFF

2nd speed 2nd speed

2nd speed

1 min.

1st speed

2 min.55sec.

1.1.5 APPLICATION DATA SAFETY PRECAUTIONS

¡ Please read these “Safety Precautions” first then accurately execute the installation work. ¡ Though the precautionary points indicated herein are divided under two headings,

WARNING and CAUTION , those points

which are related to the strong possibility of an installation done in error resulting in death or serious injury are listed in the

WARNING section. However, there is also a possibility of serious consequences in relationship to the points listed in the CAUTION section as well. In either case, important safety related information is indicated, so by all means, properly observe all

that is mentioned.

¡ After completing the installation, along with confirming that no abnormalities were seen from the operation tests, please explain

operating methods as well as maintenance methods to the user (customer) of this equipment, based on the owner’s manual.

Moreover, ask the customer to keep this sheet together with the owner’s manual.

WARNING

¡ To disconnect the appliance from the mains supply this appliance must be connected to the mains by means of

a circuit breaker or a switch (use a recognized 16A) with a contact separation of at least 3mm.

¡ The appliance shall be installed in accordance with national wiring regulations. ¡ This system should be applied to places as households, residences and the like. Application to inferior environ-

ment such as engineering shop could cause equipment malfunction.

¡ Please entrust installation to either the company which sold you the equipment or to a professional contractor.

Defects from improper installations can be the cause of water leakage, electric shocks and fires.

¡ Execute the installation accurately, based on following the installation manual. Again, improper installations can

result in water leakage, electric shocks and fires.

¡ For installation, confirm that the installation site can sufficiently support heavy weight. When strength is insuffi-

cient, injury can result from a falling of the unit.

¡ For electrical work, please see that a licensed electrician executes the work while following the safety standards

related to electrical equipment, and local regulations as well as the installation instructions, and that only exclusive use circuits are used. Insufficient power source circuit capacity and defective installment execution can be the cause of electric shocks and fires.

¡ Accurately connect wiring using the proper cable, and insure that the external force of the cable is not conducted

to the terminal connection part, through properly securing it improper connection or securing can result in heat generation or fire.

¡ Ta ke care that wiring does not rise upward ,and accurately install the lid/service panel.It’s improper installation

can also result heat generation or fire.

¡ When setting up or moving the location of the air conditioner, do not mix air etc. or anything other than the

designated refrigerant within the refrigeration cycle. Rupture and injury caused by abnormal high pressure can result from such mixing.

¡ Always use accessory parts and authorized parts for installation construction. Using parts not authorized by this

company can result in water leakage, electric shock, fire and refrigerant leakage.

¡ Ventilate the work area when refrigerant leaks during the operation.

Coming in contact with fire, refrigerant could generate toxic gas.

¡ Confirm after the foundation construction work that refrigerant does not leak.

If coming in contact with fire of a fan heater, a stove or movable cooking stove, etc., refrigerant leaking in the room could generate toxic gas.

¡ In joining pipes, do not use conventional (R22) pipng flare nuts, etc. The use of conventional pipng materials may

lead to the rapture of piping due to higher pressure used for the refrigerant cycle and possible personal injury. (Use only piping material designed specifically for R410A)

CAUTION

¡ Execute proper grounding. Do not connect the ground wire to a gas pipe, water pipe, lightning rod or a telephone

ground wire. Improper placement of ground wires can result in electric shock.

¡ The installation of an earth leakage breaker is necessary depending on the established location of the unit.

No installing an earth leakage breaker may result in electric shock.

¡ Do not install the unit where there is a concern about leakage of combustible gas.

The rare even of leaked gas collecting around the unit could result in an outbreak of fire.

¡ For the drain pipe, follow the installation manual to insure that it allows proper drainage and thermally insulate it

to prevent condensation. Inadequate plumbing can result in water leakage and water damage to interior items.

¡ Do not place objects near the outdoor unit or allow leaves to gather around the unit. If there are objects or leaves

around the outdoor unit, small animals may enter unit and contact electrical parts resulting in break down, emission of smoke or flame.

(1) Selection of location for installation

(a) Indoor unit

(i) Where there is no obstructions to the air flow and where the cooled

air can be evenly distributed.

(ii) A solid place where the unit or the wall will not vibrate.

(iii) A place where there will be enough space for servicing. (Where

space mentioned below can be secured)

(iv) Where wiring and the piping work will be easy to conduct.

(v) The place where receiving part is not exposed to the direct rays of

the sun or the strong rays of the street lighting.

(b) Outdoor unit

(i) A place where good air circulation can be obtained.

(ii) A place where the exhausted air will not be sucked in for the second time.

(iii) A place where the unit will not be affected by other heat sources. (When there are several units installed or another heat

source)

(iv) Do not install the unit near the seaside, or where there is possibility of chlorine gas generation.

(v) A place where discharged hot and cold air or unit’s operating sound will not be a nuisance to the neighborhood.

(vi) A place where servicing space can be secured.

(vii) A place where vibration will not be enlarged.

(viii) In heating operation, snow deposit on the heat-exchanger of outdoor unit must be

prevented for keeping the normal performance capacity.

1) Snow-hood on outdoor unit as in drawing, will reduce the frequency of

defrost operation.

When installing the snow hood, take care so that the air outlet of the snow

hood will not face directly into the most windy direction.

2) Design the base higher than possible snow deposit.

height difference.

Snow hood

Height: Must be over the possible snow deposit height

Air inlet

Air Outlet

Note (1) If the wall is higher than 1.2 m or a ceiling is

present, distances larger than indicated in the above table must be provided.

100

No obstacles (Service space for electrical parts)

Unit : mm

Model

Item

20, 25, 35 type 50 type

One way piping length (R) 15 m 25 m

Outdoor

unit is lower

10 m 15 m

Outdoor unit

is higher

10 m 15 m

5 cm

10 cm

1.5 cm

6.5 cm

Ver tical height difference (h)

(2) Installation of indoor unit

(a) Installation of installation board

(i) Fixing of installation board

(b) Drilling of holes and fixture sleeve (Option parts)

When drilling the wall that contains a metal lath, wire lath or metal plate, be sure to use pipe hole sleeve sold separately.

(i) Drill a hole with ø65

whole core drill

(ii) Adjusting sleeve length

Fixing on concrete wall

Use of nut anchor Use of bolt anchor

Bolt (M6 × 12)

Mounting board

Nut (M6)

Mounting board

Max. 10

(iii) Install the sleeve

(Inserting sleeve) (*Sleeve + *Inclined + *Sealing plate)

Note (1) Drill a hole with incline of 5 degree from

indoor side to outdoor side.

Indoor side Outdoor side

Cut off the sleeve collar in case of drawing piping out to rear.

Cut off the sleeve collar that can be seen from beneath the unit.

Wall thickness

+ 1.5 cm

Indoor side Outdoor side

Turn to tighten

Paste

View of sleeve when installed

Inclined flange

Sealing plate

Sleeve

Indoor side Outdoor side

Look for the inside wall structures (Intersediate support or pillar and firaly install the unit after level surface has been checked.)

Mating mark for level surface

450

Adjustment of the installation board in the horizontal direction is to be conducted with four screws in a temporary tightened state.

Adjust so that board will be level by turning the board with the standard hole as the center.

Standard hole

(i) Mounting of connecting wires

1) Remove the lid (R).

2) Remove the terminal cover.

3) Remove the wiring clamp.

4) Connect the connecting wire securely to the terminal block.

(ii) Protective taping (Protect the cable with tape at the section where the cable passes through the hole opened on the wall.)

(iii) Forming of pipe (Holding down the pipe at the root, change the pipe direction, extend it and adjust according to the

circumstance.)

[When the pipe is extended to left and taken out from the rear center]

(Drain pipe relocation procedure)

Remove the drain pipe.

2. Remove the drain cap. 3. Insert the drain cap. 4.

Connect the drain pipe.

¡ Loosen the spring

clamp and securely insert the drain pipe.

Note: If it is inserted in-

sufficiently, water leakage could result.

¡ Loosen the spring

clamp to remove.

¡ Remove by hand or

use cutting pliers, etc.

¡ Securely insert the

drain cap removed in the step 2.

Note: If it is inserted in

sufficiently, water leakage could result.

Since this air conditioner has been designed to collect dew drops on the rear surface to the drain pan, do not attach the power cord above the gutter.

Gutter

Wall

Pipe accommodation section

1 Connect the connection wire securely to the terminal block. If the wire is not affixed completely, contact will be

poor,and it is dangerous as the terminal block may heat up and catch fire.

2 Take care not to confuse the terminal numbers for indoor and outdoor connections.

3 Affix the connection wire using the wiring clamp.

5) Fix the connecting wire by wiring clamp.

6) Attach the lid.

7) Close the suction grille.

Use cables for interconnection wiring to avoid loosening of the wires. CENELEC code for cables. Required field cables. H05RNR3G1.5 (Example) or 245IEC57

H Harmonized cable type

05 300/500 volts

R Natural-and/or synth, rubber wire insulation N Polychloroprene rubber conductors insulation R Standed core

4or5 Number of conductors

G One conductor of the cable is the earth conductor (yellow/

green)

1.5 Section of copper wire (mm

)

Clamp

Terminal cover

Lid (R)

Terminal block

(d) Installation on indoor unit

(i) Install the indoor unit on the mounting plate.

Hook the upper part of the indoor unit on the stoppers disposed at the upper part of the mounting plate and lightly push the lower part of the indoor unit so that the unit is fixed in position. ¡ When removing the indoor unit

1) Disconnect the lid at right and left.

2) Pull down the stoppers (right and left) provided at the bottom of the indoor unit base. (See the detail view shown at right.)

(ii) Be sure not to leave any trap on the drain pipe.

(3) Installation of outdoor unit

(a) Installation of outdoor unit

(i) Make sure that sufficient space for installation and service is secured. (ii) Fix the leg sections of the unit on a firm base which will not play.

Attach cushion pads, etc. between the unit and the mounting fixtures not to transmit vibration to the building.

(iii) Attach a drain elbow, etc. under the drain port of the bottom plate to guide drain water.

(Drain elbow should not be used where days when temperature drops below 0°C continue for several days. Draining may be

disturbed by frozen water.)

(iv) When installing the unit at a higher place or where it could be toppled with strong winds, secure the unit firmly with

foundation bolts, wire, etc.

(b) Connection of indoor and outdoor connecting wiring

(i) Connect the wiring according to the number of the indoor terminal block. (Mis-wiring may cause the burning damage, and

make sure to connect correctly.)

Notes (1) To prevent the mis-operation by noise, when the connecting wire too long for indoor and outdoor. Please hide the fixed wire in the pipe or use vinyl tape to set.

Do not put wire into the unit.

Notes (2) Please let the anchorized personal to decide by indoor wiring code whether connect the leakage breaker or not.

Indoor unit base bottom stopper (2 places at right, left)

Light push

Mounting plate

Wall

Declining slope

Inverted slope

Trap

(4) Refrigerant piping

(a) Preparation

Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc. from entering them.

Indoor unit side

Outdoor unit side

¡ Remove the flared nuts.

(on both liquid and gas sides)

¡ Remove the flared nuts.

(on both liquid and gas sides)

¡ Install the removed flared nuts to the pipes to be connected,

then flare the pipes.

Dimension A Liquid side (φ6.35): 9.1 dia Gas side (φ9.52): 13.2 dia (φ12.7): 16.6 dia

Press

Remove

(Do not

turn)

Brown

For power supply, indoor outdoor

2 Blue Connecting wiring 3 Black

Indoor/outdoor signal wire (Low voltage)

Yellow/Green Earth wiring terminal

Terminal block

Interconnecting wire

Service

Valve

(three-way valve)

Charge hose (Designed specifically for R410A)

Compound pressure gauge

Pressure gauge

Gauge Manifold (Designed specifically for R410A)

Handle Hi.

Vacuum pump

Vacuum pump adapter (Anti-reverse flow type) (Designed specifically for R410A)

Charge hose (Designed specifically for R410A)

Service Port

—0.1MPa

(—76cmHg)

Handle Lo

Service Valve (two-way valve)

¡ Always use a Torque wrench and back up spanner to tighten the flare nut.

(i) Tighten all flare nuts in the pipings both indoor and outside will so as not to cause leak.

(ii) Connect service valve, charge hose, manifold valve and vacuum pump as is illustrated below.

(iii) Open manifold valve handle Lo to its full width, and perform vacuum or evacuation.

Continue the vacuum or evacuation operation for 15 minutes or more and check to see that the vacuum gauge reads – 0.1

MPa (– 76 cmHg).

(iv) After completing vacuum operation, fully open service valve (Both gas and liquid sides) with hexagon headed wrench.

(v) Detach the charge hoses.

(vi) Check for possible leakage of gas in the connection parts of both indoor and outdoor.

(b) Connection of refrigerant piping

Indoor unit side

¡ Connect firmly gas and liquid side

pipings by Torque wrench.

Outdoor unit side

¡ Connect firmly gas and liquid side

pipings by Torque wrench.

¡ Specified torquing value:

Liquid side (ø6.35) : 14.0~18.0N·m (1.4~1.8kgf·m)

Gas side (ø9.52) : 34.0~42.0N·m (3.4~4.2kgf·m)

(ø12.7) : 49.0~61.0N·m (4.9~6.1kgf·m)

¡ Use one more spanner to fix the valve.

Spanner

(for fixing the piping)

Torque wrench

¡ Specified torquing value:

Liquid side (ø6.35) : 14.0~18.0N·m (1.4~1.8kgf·m)

Gas side (ø9.52) : 34.0~42.0N·m (3.4~4.2kgf·m)

(ø12.7) : 49.0~61.0N·m (4.9~6.1kgf·m)

¡ Since the system uses service ports differing in diameter from those found on the conventional models, a charge hose (for R22)

presently in use is not applicable.

Please use one designed specifically for R410A

Please use an anti-reverse flow type vacuum pump adapter so as to prevent vacuum pump oil from running back into the system.

Oil running back into an air-conditioning system may cause the refrigerant cycle to break down.

Additional refrigerant charge

¡ 20, 25, 35 type

Additional refrigerant charge is not required at all.

¡ 50 type

When refrigerant piping exceeds 15m conduct additional refrigerant charge by weight after refrigerant piping completion.

Additional charge amount per meter = 20g/m

[Example]

How much amount of additional charge for 25m piping? (25 – 15)m × 20g/m = 200g 200g for additional charge

(d) Insulation of connecting portion

(i) Cover the connecting portion of the refrigerant piping with the pipe cover and seal them.

If neglecting to do so, moisture occurs on the piping and water will drip out.

(ii) Finishing and fixing

1) Tie up the piping with wrapping tape, and shape it so

that it conforms to which the pipe is attached.

2) Fix them with clamps as right figure.

Cover the exterior portion with covering tape and shape the piping so it will match the contours of the route that the piping to take. Also fix the wiring and pipings to the wall with clamps.

Insulation

Refrigerant piping

Electrical wiring

Covering tape

Drain hose

Tapping screw

Vinyl tape

To cover the connecting portion with insulation material materials, cut upper portion and then seal it with insulation materials.

(5) Test run

(a) Conduct trial run after confirming that there is no gas leaks.

(b) When conducting trial run set the remote controller thermostat to continuous operation position. However when the power source

is cut off or when the unit’s operation switch is turned off or was turned to fan operation position, the unit will not go into operation

in order to protect the compressor.

(i) When there is something wrong with the electric outlet and if the insertion of the electric plug is insufficient, there may occur

a burn out.

(ii) It is very important to be careful of above when plugging in the unit to an already furnished electrical outlet.

(d) Explain to the customer on the correct usage of the air conditioner in simple layman’s terms.

(e) Make sure that drain flows properly.

(f) Standard operation data

Model

SRK20ZD-S1 SRK25ZD-S1 SRK35ZD-S1 SRK50ZD-S1

Item

Cooling – –––

Heating 2.5~2.7 2.5~2.7 2.8~3.0 3.2~3.3

Cooling 0.9~1.1 0.9~1.1 0.8~1.0 0.7~0.9

Heating – –––

Cooling 13~15 13~15 13~15 14~16

Heating 18~20 18~20 18~20 24~26

Cooling 2.4/2.3/2.2 3.1/3.0/2.9 5.4/5.2/5.0 7.6/7.3/7.0

Running current (A)

Heating

3.0/2.9/2.8 4.5/4.3/4.1 5.9/5.7/5.4 9.0/8.6/8.2

Note (1) The data are measured at following conditions

Ambient air temperature

Indoor side: Cooling ... 27˚C DB, 19˚C WB, Heating ... 20˚C DB

Outdoor side: Cooling ... 35˚C DB, 24˚C WB, Heating ... 7˚C DB, 6˚C WB

Low pressure (MPa)

Temp. difference between return air and supply air (°C)

High pressure (MPa)

(220/230/240V)

(ii) When manipulating the remote controller mounted on

a wall:

Make sure that it works normally (i.e., transmission/reception

signal is audible) before mounting.

Notes (1) The remote controller is correctly facing the

sensing element of the air conditioner when being manipulated.

(2) The typical coverage is indicated (in the left

illustration). It may be more or less depending on the installation.

(3) The coverage may be less or even nil. If the sensing

element is exposed to strong light, such as direct sunlight, illumination, etc., or dust is deposited on it or it is used behind a curtain, etc.

or less

5 m or less

Wireless remote controller

5 m or less

Remote controller available in this area.

Receiver

or less

(6) Precautions for wireless remote controller installation and operation

(a) Wireless remote controller covers the following distances:

(i) When operating facing the air conditioner:

or less

1.1.6 MAINTENANCE DATA

(1) Troubleshooting procedures for electrical equipment

(a) Cautions

1 If you are disassembling and checking an air conditioner, be sure to turn off the power before beginning. When working on

indoor units, let the unit sit for about 1 minute after turning off the power before you begin work. When working on an outdoor

unit, there may be an electrical charge applied to the main circuit (electrolytic condenser), so begin work only after discharg-

ing this electrical charge (to DC 10 V or lower).

2 When taking out printed circuit boards, be sure to do so without exerting force on the circuit boards or package components.

3 When disconnecting and connecting connectors, take hold of the connector housing and do not pull on the lead wires.

(b) Items to check before troubleshooting

1 Have you thoroughly investigated the details of the trouble which the customer is complaining about?

2 Is the air conditioner running? Is it displaying any self-diagnosis information?

3 Is a power supply with the correct voltage connected?

4 Are the control lines connecting the indoor and outdoor units wired correctly and connected securely?

5 Is the outdoor unit’s refrigerant service valve open?

If the air conditioner does not run at all, diagnose the trouble using the following troubleshooting procedure. If the air conditioner

is running but breaks down, proceed to troubleshooting step (d).

Important When all the following conditions are met, we say that the air conditioner will not run at all.

1 The RUN light does not light up.

2 The flaps do not open.

3 The indoor unit fan motors do not run.

4 The self-diagnosis display does not function.

YES

Troubleshooting procedure (If the air conditioner does not run at all)

Is the correct voltage connected for the power supply?

With the power off, do the flaps open manually, then close again when the power is turned on?

Is there a reception sound emitted from the unit when it is operated by the remote controller?

Replace the indoor unit’s circuit board and perform an operation check.

Make sure the correct voltage is connected, then perform an operation check.

Is the current fuse on the indoor unit’s board blown?

Proceed to the indoor unit circuit board check.

Proceed to the wireless remote controller troubleshooting procedure.

If the package components are not damaged, replace the fuse and perform an operation check again.

* If the voltage is correct, it will be

within the following voltage range. 198 ~ 264 V

(d) Troubleshooting procedure (If the air conditioner runs)

YES

Note (1) Even in cases where only intermittent stop data are generated, the air conditioning system is normal. However, if the same protective operation recurs

repeatedly (3 or more times), it will lead to customer complaints. Judge the conditions in comparison with the contents of the complaints.

Confirm the contents of the customer complaint.

Check the self-diagnosis display.

Eliminate the cause of the trouble and perform an operation check.

The air conditioning system is operating normally.

Replace the faulty component, then perform an operation check.

Identify the faulty component by using the check procedure corresponding to the content of the trouble.

Using the Service Mode, access the self-diagnosis displays generated in the past.

Using the Service Mode, access the stop history due to protection control generated in the past.

Is there a history of stops due to protection control?

(1)

Is there a history of selfdiagnosis display items?

Is an error code displayed by the self-diagnosis function?

The cause of the trouble can be specifically identified.

See page 38.

See pages 39~42.

(e) Self-diagnosis table

When this air conditioner performs an emergency stop, the reason why the emergency stop occurred is displayed by the flashing of

display lights. If the air conditioner is operated using the remote controller 3 minutes or more after the emergency stop, the trouble

display stops and the air conditioner resumes operation.

(1)

Notes (1) The air conditioner cannot be restarted using the remote controller for 3 minutes after operation stops.

Indoor unit display panel

Description

of trouble

Cause Display (flashing) condition

RUN light

TIMER

light

6 time

flash

When there is no signal between the indoor unit’s board and outdoor unit’s board for 10 seconds or longer (when the power is turned on), or when there is no signal for 1 minute 50 seconds or longer (during operation)(the compressor is stopped).

When a heat exchanger sensor wire disconnection is detected while operation is stopped. (If a temperature of –20ºC or lower is detected for 15 seconds, it is judged that the wire is disconnected.) (Not displayed during operation.)

When a room temperature sensor wire disconnection is detected while operation is stopped. (If a temperature of –20ºC or lower is detected for 15 seconds, it is judged that the wire is disconnected.) (Not displayed during operation.)

•

Defective power supply, Broken signal wire, defective in/outdoor unit boards

•

Broken heat exchanger sensor wire, poor connector connection

•

Broken room temperature sensor wire, poor connector connection

Error of signal transmission

Heat exchanger sensor error

Room temperature sensor error

When conditions for turning the indoor unit’s fan motor on exist during air conditioner operation, an indoor unit fan motor speed of 300 rpm or lower is measured for 30 seconds or longer. (The air conditioner stops.)

When the value of the discharge pipe sensor exceeds the set value. (The air conditioner stops.)

•

Defective fan motor, poor connector connection

•

Gas shortage, defective discharge pipe sensor, closed service valve

Indoor fan motor error

Over heat of compressor

When a sensor wire disconnection is detected while operation is stopped. (If a temperature of –50ºC or lower is detected for 15 seconds, it is judged that the wire is disconnected.) (Not displayed during operation.)

•

Broken heat exchanger sensor wire, poor connector connection

Outdoor heat exchanger sensor error

When an outdoor air temperature sensor wire disconnection is detected while operation is stopped. (If a temperature of –40ºC or lower is detected for 15 seconds, it is judged that the wire is disconnected.) (Not displayed during operation.)

•

Broken outdoor air temp. sensor wire, poor connector connection

Outdoor air temperature sensor error

When a compressor discharge pipe sensor wire disconnection is detected for 15 seconds or longer (less than 7ºC) after the outdoor unit’s speed has continued at 0 rps or higher for 9 minutes. (The air conditioner stops.)

•

Broken discharge pipe sensor wire, poor connector connection

Discharge pipe sensor error

The inverter output current (compressor motor current) exceeds the set value during compressor start. (The air conditioner stops.)

•

Compressor locking, open phase on compressor output, shortcircuit on power transistor, closed service valve

Current Cut

When the outdoor unit’s fan motor speed continues for 30 seconds or longer at 75 rpm or lower. (3 times) (The air conditioner stops.)

•

Defective fan motor, poor connector connection

Outdoor fan motor error

When there is an emergency stop caused by trouble in the outdoor unit, or the input current value is found to be lower than the set value continuously for 3 minutes or longer. (The air conditioner stops.)

•

Broken power transistor, broken compressor wire

•

Broken discharge pipe sensor wire, poor connector connection

•

Compressor blockage

Trouble of outdoor unit

If the compressor motor’s magnetic pole positions cannot be correctly detected when the compressor starts. (The air conditioner stops.)

•

Defective compressor

•

Open phase on compressor

•

Defective outdoor unit boards

Rotor lock

1 time

flash

2 time

flash

6 time

flash

5 time

flash

2 time

flash

Keeps

flashing

4 time

flash

Keeps

flashing

1 time

flash

Keeps

flashing

1 time

flash

7 time

flash

2 time

flash

2 time

flash

2 time

flash

(f) Service mode (Trouble mode access function)

This air conditioner is capable of recording error displays and protective stops (service data) which have occurred in the past. If self-diagnosis displays cannot be confirmed, it is possible to get a grasp of the conditions at the time trouble occurred by checking these service data.

(i) Explanation of terms

Explanation

Term

Service mode

Service data

The service mode is the mode where service data are displayed by flashing of the display lights when the operations in item (ii) below are performed with the indoor controller.

These are the contents of error displays and protective stops which occurred in the past in the air conditioner system. Error display contents and protective stop data from past anomalous operations of the air conditioner system are saved in the indoor unit controller’s non-volatile memory (memory which is not erased when the power goes off). There are two types of data, self-diagnosis data and stop data, described below.

Self-diagnosis data

Stop data

These are the data which display the reason why a stop occurred when an error display (selfdiagnosis display) occurred in an indoor unit. Data are recorded for up to 5 previous occurrences. Data which are older than the 5th previous occurrence are erased. In addition, data on the temperature of each sensor (room temperature, indoor heat exchanger, outdoor heat exchanger, outdoor air temperature, discharge pipe), remote controller information (operation switching, fan speed switching) are recorded when trouble occurs, so more detailed information can be checked.

These are the data which display the reason by a stop occurred when the air conditioning system performed protective stops, etc. in the past. Even if stop data alone are generated, the system restarts automatically. (After executing the stop mode while the display is normal, the system restarts automatically.) Data for up to 10 previous occasions are stored. Data older than the 10th previous occasion are erased. ( Important) In cases where transient stop data only are generated, the air conditioner system

may still be normal. However, if the same protective stop occurs frequently (3 or more times), it could lead to customer complaints.

(ii) Service mode display procedure

(*1)

YES

Start

Did a buzzer located in the indoor unit sound?

Are other data displayed?

Within 1 minute after turning the air conditioner’s power on, signals will be sent from the remote controller

(*2)

Count the number of times the RUN light and TIMER light flash

(*3)

, and check the contents of the

error, etc. from the table. (See pages 41 and 42.)

Change the remote controller’s settings based on the instructions in the table

(*4)

. (See page 40.)

*1: If the buzzer does not sound no matter how

many times you repeat the operation, the unit ON/OFF button may be faulty.

*2: Set the remote controller’s settings on

“Cooling Operation,” “Fan Speed: MED” and “Set Temperature: 21ºC.”

Turn off the air conditioner’s power to terminate the service mode. If you are going to turn the power on again, wait 1 minute or longer after turning it off.

Turn the air conditioner’s power on again while pressing the unit ON/OFF button.

Turn off the air conditioner’s power once, then wait 1 minute or longer.

*3: To count the number of flashes in the service mode, count the number of flashes after the light lights up for 1.5 second

initially (start signal). (The time that the light lights up for 1.5 second (start signal) is not counted in the number of

flashes.)

*4:

When in the service mode, when the remote controller’s settings (operation switching, fan speed switching, temperature

setting) are set as shown in the following table and sent to the air conditioner unit, the unit switches to display of service data.

1 Self-diagnosis data

What are Self- ...... These are control data (reasons for stops, temperature at each sensor, remote controller information)

diagnosis Data? from the time when there were error displays (abnormal stops) in the indoor unit in the past.

Data from up to 5 previous occasions are stored in memory. Data older than the 5th previous occasion are erased.

The temperature setting indicates how many occasions previous to the present setting the error display

data are and the operation switching and fan speed switching data show the type of data.

Remote controller setting

Contents of output data

Fan speed switching

MED

AUTO

MED

AUTO

Displays the reason for stopping display in the past (error code).

Displays the room temperature sensor temperature at the time the error code was displayed in the past.

Displays the indoor heat exchanger sensor temperature at the time the error code was displayed in the past.

Displays the remote controller information at the time the error code was displayed in the past.

Displays the outdoor air temperature sensor temperature at the time the error code was displayed in the past.

Displays the outdoor heat exchanger sensor temperature at the time the error code was displayed in the past.

Displays the discharge pipe sensor temperature at the time the error code was displayed in the past.

Cooling

Operation switching

Heating

Remote controller setting

Indicates the number of

occasions previous to the present

the error display data are from.

Temperature setting

21°C 22°C 23°C 24°C 25°C

1 time previous (previous time)

2 times previous

3 times previous

4 times previous

5 times previous

Remote controller setting

Fan speed

switching

Operation

switching

Displayed data

Temperature

setting

21°C 22°C 23°C 24°C 25°C

Displays the reason for the stop (error code) the previous time an error was displayed.

Displays the reason for the stop (error code) 2 times previous when an error was displayed.

Displays the reason for the stop (error code) 3 times previous when an error was displayed.

Displays the reason for the stop (error code) 4 times previous when an error was displayed.

Displays the reason for the stop (error code) 5 times previous when an error was displayed.

Cooling MED

(Example)

0.5 sec.

1.5 sec.

RUN light

(10’s digit)

TIMER light

(1’s digit)

11-second interval

0.5 sec.

OFF

•

In the case of current safe (heating CT1) (example: stop code “32”) The RUN light (10’s digit) flashes 3 times and the TIMER light (1’s digit) flashes 2 times. 3 × 10 + 2 × 1 = 32 → From the table, read the instructions for error code 32, “current safe (heating CT1).

2 Stop data

Remote controller setting

Fan speed

switching

Operation

switching

Displayed data

Temperature

setting

21°C 22°C 23°C 24°C 25°C 26°C 27°C 28°C 29°C 30°C

Displays the reason for the stop (stop code) the previous time when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 2 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 3 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 4 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 5 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 6 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 7 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 8 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 9 times previous when the air conditioner was stopped by protective stop control.

Displays the reason for the stop (stop code) 10 times previous when the air conditioner was stopped by protective stop control.

Cooling LO

(iii) Error code, stop code table (Assignment of error codes and stop codes is done in common for all models.)

(2 times)

(3 times)

OFF OFF

Major category

Number of flashes

when in service mode

Minor category

Error content

Stop code

Error code

TIMER

light

(1’s digit)

RUN light

(10’s digit)

Cause Occurrence conditions

Error

display

Auto

recovery

1 time

flash

1 time

flash

2 time

flash

1 time

flash

3 time

flash

1 time

flash

2 time

flash

2 time

flash

3 time

flash

3 time

flash

4 time

flash

5 time

flash

6 time

flash

7 time

flash

8 time

flash

9 time

flash

7 time

flash

2 time

flash

3 time

flash

4 time

flash

5 time

flash

6 time

flash

0 Normal

Current

Cut

Outdoor

unit error

Outdoor

fan motor

error

Current

safe

Compressor Software Start Compressor lock

Compressor wiring short circuit Compressor output is open phase Outdoor unit s circuit board is faulty

Compressor start fails 42 times in succession and the reason for the final failure is current cut.

After the compressor starts, it stops due to current cut at less than 20 rps.

When operation is stopped by current cut at 20 rps or higher.

When the DC voltage (DC 280 V) exceeds 350 V.

When it is judged that the power transistor was damaged at the time the compressor started.

When PWM calculation results of 0% continue for 3 minutes or longer.

When PWM calculation results of 90% and an input current lower than the set value continue for 3 minutes or longer.

When an abnormal stop occurs 3 times with automatic recovery within 20 minutes after the outdoor unit s power supply was turned on.

When the power supply voltage drops during operation.

When the wrong voltage is applied.

When a fan speed of 75 rpm or lower continues for 30 seconds or longer.

When there is a current safe stop in current safe I mode during cooling operation.

When there is a current safe stop in current safe I mode during heating operation.

When there is a current safe stop in current safe II mode during cooling operation.

When there is a current safe stop in current safe II mode during heating operation.

When there is a current safe stop in current safe III mode during cooling operation.

When there is a current safe stop in current safe III mode during heating operation.

When there is a current safe stop in current safe III + 3 A mode during heating operation.

Lower than 20 rps

20 rps or higher

Excessive voltage (DC 350 V)

Short circuit in the power transistor (high side)

Current cut circuit breakdown

PWM calculation results are abnormal.

Input is 2A or lower (PWM 90% or higher)

Abnormal stop 3 times in 20 minutes.

Voltage drop

Outdoor unit s fan motor is abnormal

Cooling current safe I

Heating current safe I

Cooling current safe II

Heating current safe II

Cooling current safe III

Heating current safe III

Heating current safe III + 3 A

Wrong voltage

-- -

Service valve closed Compressor output is open phase. Electronic expansion valve is faulty.

Service valve is closed. Compressor output is open phase. Compressor is faulty. Electronic expansion valve is faulty.

Service valve is closed. Compressor output is open phase. Electronic expansion valve is faulty. Refrigerant is insufficient.

Outdoor fan motor is faulty. Connector connections are poor. Outdoor unit s circuit board is faulty.

Overcharge Compressor lock

Power supply construction is defective. Outdoor unit s circuit board is faulty.

Power supply construction is defective.

Compressor wiring is disconnected. Outdoor unit s circuit board is faulty.

Compressor wiring is disconnected. Power transistor is damaged.

Outdoor unit s circuit board is faulty. Power transistor is damaged.

Outdoor unit s circuit board is defective. Power supply is abnormal.

Current

safe

4 time

flash

1 time

flash

2 time

flash

3 time

flash

4 time

flash

5 time

flash

6 time

flash

1 time

flash

2 time

flash

5 time

flash

OFF 50

6 time

flash

OFF 60

7 time

flash

1 time

flash

8 time

flash

OFF 80

1 time

flash

2 time

flash

3 time

flash

4 time

flash

5 time

flash

6 time

flash

7 time

flash

8 time

flash

2 time

flash

3 time

flash

4 time

flash

5 time

flash

6 time

flash

When there is a current safe stop in overload 1 mode during cooling operation.

When there is a current safe stop in overload 2 mode during cooling operation.

When there is a current safe stop in overload 3 mode during cooling operation.

When there is a current safe stop in overload 1 mode during heating operation.

When there is a current safe stop in overload 2 mode during heating operation.

When there is a current safe stop in overload 3 mode during heating operation.

When the discharge pipe sensor’s value exceeds the set value.

After the compressor starts, when the compressor stops at less than 16 rps due to rotor lock.

When the compressor stops at 16 rps or higher speed due to rotor lock.

When compressor start fails 42 times in succession and the reason for the final failure is rotor lock.

When a temperature of –20ºC or lower is sensed continuously for 40 minutes during heating operation (the compressor stops).

When a temperature of –50ºC or lower is sensed continuously for 40 minutes during heating operation (the compressor stops).

When the indoor unit’s fan motor is detected to be running at 300 rpm or lower speed with the fan motor in the ON condition while the air conditioner is running.

Anti-condensation prevention control is operating.

When the anti-frost control operates and the compressor stops during cooling operation.

When high pressure control operates during heating operation and the compressor stops.

When compressor overheating protective control operates and the compressor stops.

When refrigeration cycle system protective control operates.

When a disconnection signal (temperature below 7ºC) is sent for 15 seconds or longer as the discharge pipe sensor data after the outdoor unit’s speed is 0 rps or higher continuously for 9 minutes.

When 1 minute 55 seconds passes without communications signals from either the outdoor unit or the indoor unit being detected correctly.

When 10 seconds passes after the power is turned on without communications signals from the indoor or outdoor unit being detected correctly.

When 1 minute 50 seconds passes without communications signals from either the outdoor unit or the indoor unit being detected correctly.

Cooling overload 1 (outdoor temperature: 36~40ºC)

Compressor

overheat

125ºC

Serial signal transmission

error

Can’t receive signals for 1 minute 55 seconds (if communications have recovered)

Rotor lock

Less than 16 rps

Protective

control

operation

Indoor unit fan motor is abnormal.

Discharge pipe sensor is abnormal (anomalous stop).

Indoor heat exchanger sensor is abnormal (anomalous stop).

Outdoor heat exchanger sensor is abnormal (anomalous stop).

Anti-condensation control

Anti-frost control

High pressure control

Compressor overheating protection control

Refrigeration cycle system protective control

16 rps or higher

Phase switching defects (U phase)

Phase switching defects (V phase)

Phase switching defects (W phase or impossible to distinguish).

Compressor software start (within 4 seconds after phase switching)

Connection lines between the indoor and outdoor units are faulty.

Serial transmission error.

Heating overload 1 (outdoor temperature: 5~12ºC)

Cooling overload 2 (outdoor temperature: 40~45ºC)

Heating overload 2 (outdoor temperature: 12~17ºC)

Cooling overload 3 (outdoor temperature: 45ºC~)

Heating overload 3 (outdoor temperature: 17ºC~)

(2 times)

(3 times)

(2 times)

(4 times)

Major category

Number of flashes

when in service mode

Minor category

Error content

Stop code

Error code

TIMER

light

(1’s digit)

RUN light

(10’s digit)

Cause

Occurrence conditions

Error

display

Auto

recovery

Overcharge Compressor lock Overload operation

Refrigerant is insuffcient. Discharge pipe sensor is faulty. Service valve is closed.

Power supply is faulty. Power supply cables and signal lines are improperly wired. Indoor or outdoor unit circuit board is faulty.

Compressor is faulty Compressor output is open phase Electronic expansion valve is faulty. Overload operation Outdoor unit circuit board is faulty.

Compressor is faulty Compressor wiring is disconnected. Compressor wiring is short circuited. Outdoor unit’s circuit board is faulty.

Fan motor is faulty. Connector connections are poor. Indoor unit circuit board is faulty.

Discharge pipe sensor wire is disconnected. Connector connections are poor.

Heating overload Indoor unit fan speed drops Indoor heat exchanger sensor short circuit

Refrigerant is insufficient. Discharge pipe sensor is faulty. Service valve is closed.

Service valve is closed. Refrigerant is insufficient.

High humidity condition. Humidity sensor is faulty.

Indoor unit fan speed drops. Indoor heat exchanger sensor short circuit

Indoor heat exchanger sensor wire is disconnected. Connector connections are poor.

Outdoor heat exchanger sensor wire is disconnected. Connector connections are poor.

Connection lines between the indoor and outdoor units are faulty. Indoor or outdoor unit circuit boards are faulty.

Indoor or outdoor unit circuit boards are faulty. Noise is causing faulty operation.

Notes (1) The number of flashes when in the Service Mode do not include the 1.5 second period when the light light up at first (starting signal). (See the example shown

below.)

0.5 sec.

1.5 sec.

RUN light

(10 s digit)

TIMER light

(1 s digit)

11-second interval

0.5 sec.

OFF

•

Notes (2) Abnormal Stop:

Is not displayed. (automatic recovery only)

 Displayed. If there is a ( ) displayed, the error display shows the number of times that an automatic recovery occurred for the same reason has reached the number of times in ( ). If no ( ) is displayed, the error display shows that the trouble has occurred once.

Notes (3) Automatic Recovery:

Does not occur

 Automatic recovery occurs.

(iv) Remote controller information tables

1) Operation switching

RUN light

(Operation switching)

Display pattern when

in service mode

Operation switching

when there is an

abnormal stop

AUTO

DRY

COOL

HEAT

2) Fan speed switching

TIMER light

(Fan speed switching)

Display pattern when

in service mode

Fan speed

switching when

there is an

abnormal stop

AUTO

MED

HI POWER

ECONO

* If no data are recorded (error code is normal), the information display in the remote controller becomes as follows.

Remote controller setting

Operation switching

Fan speed switching

Display when error code is normal.

AUTO

0.5 sec.

1.5 sec.

RUN light

(10 s digit)

TIMER light

(1 s digit)

11-second interval

0.5 sec.

OFF

(Example): Operation switching, fan speed switching, cooling HI

(v) Room temperature sensor temperature, indoor heat exchanger sensor temperature, outdoor air tempera-

ture sensor temperature, outdoor heat exchanger sensor temperature table

Units:˚C

Buzzer sound (minus)

TIMER light (1’s digit)

RUN light (10’s digit)

Yes

(sounds for 0.1 second)

-60

-50

-40

-30

-20

-10

0123456789

-61

-51

-41

-31

-21

-11

-1

-62

-52

-42

-32

-22

-12

-2

-63

-53

-43

-33

-23

-13

-3

-64

-54

-44

-34

-24

-14

-4

-55

-45

-35

-25

-15

-5

-56

-46

-36

-26

-16

-6

-57

-47

-37

-27

-17

-7

-58

-48

-38

-28

-18

-8

-59

-49

-39

-29

-19

-9

(does not sound)

* If no data are recorded (error code is normal), the display for each sensor becomes as shown below.

Sensor name

Room temperature sensor temperature

Indoor heat exchanger sensor temperature

Outdoor air temperature sensor temperature

Outdoor heat exchanger sensor temperature

Sensor value displayed when the error code is normal

-19˚C

-64˚C

(Example) Room temperature, indoor heat exchanger, outdoor air temperature, outdoor heat exchanger: “-9ºC”

0.5 sec.

0.1 sec.

1.5 sec.

Buzzer sound

(minus)

If the temperature is < 0, the buzzer sounds. If the temperature is

> =

0, the buzzer does not sound.

11-second interval

0.5 sec.

OFF

RUN light

(10 s digit)

TIMER light

(1 s digit)

(vi) Discharge pipe temperature table

Units: °C

Buzzer sound (minus)

TIMER light (1’s digit)

RUN light (10’s digit)

Yes

(sounds for 0.1 second)

-60

-40

-20

100

120

140

0123456789

-62

-42

-22

-2

102

122

142

-64

-44

-24

-4

104

124

144

-46

-26

-6

106

126

146

-48

-28

-8

108

128

148

-50

-30

-10

110

130

150

-52

-32

-12

112

132

-54

-34

-14

114

134

-56

-36

-16

116

136

-58

-38

-18

118

138

(does not sound)

* If no data are recorded (error code is normal), the display for each sensor becomes as shown below.

Sensor name

Discharge pipe sensor temperature

Sensor value displayed when the error code is normal

-64°C

(Example) Discharge pipe temperature: “122ºC”

* In the case of discharge pipe data, multiply the reading value by 2. (Below, 61 x 2 = “122ºC”)

0.5 sec.

0.1 sec.

1.5 sec.

11-second interval

0.5 sec.

OFF

Buzzer sound

(minus)

If the temperature is < 0, the buzzer sounds. If the temperature is

> =

0, the buzzer does not sound.

RUN light

(10 s digit)

TIMER light

(1 s digit)

Service data record form

Customer

Date of investigation

Machine name

Error code on previous occasion.

Room temperature sensor temperature on previous occasion.

Indoor heat exchanger sensor temperature on previous occasion.

Remote controller information on previous occasion.

Outdoor air temperature sensor temperature on previous occasion.

Outdoor heat exchanger sensor temperature on previous occasion.

Discharge pipe sensor temperature on previous occasion.

Error code on second previous occasion.

Room temperature sensor temperature on second previous occasion.

Indoor heat exchanger sensor temperature on second previous occasion.

Remote controller information on second previous occasion.

Outdoor air temperature sensor temperature on second previous occasion.

Outdoor heat exchanger sensor temperature on second previous occasion.

Discharge pipe sensor temperature on second previous occasion.

Error code on third previous occasion.

Room temperature sensor temperature on third previous occasion.

Indoor heat exchanger sensor temperature on third previous occasion.

Remote controller information on third previous occasion.

Outdoor air temperature sensor temperature on third previous occasion.

Outdoor heat exchanger sensor temperature on third previous occasion.

Discharge pipe sensor temperature on third previous occasion.

Error code on fourth previous occasion.

Room temperature sensor temperature on fourth previous occasion.

Indoor heat exchanger sensor temperature on fourth previous occasion.

Remote controller information on fourth previous occasion.

Outdoor air temperature sensor temperature on fourth previous occasion.

Outdoor heat exchanger sensor temperature on fourth previous occasion.

Discharge pipe sensor temperature on fourth previous occasion.

Error code on fifth previous occasion.

Room temperature sensor temperature on fifth previous occasion.

Indoor heat exchanger sensor temperature on fifth previous occasion.

Remote controller information on fifth previous occasion.

Outdoor air temperature sensor temperature on fifth previous occasion.

Outdoor heat exchanger sensor temperature on fifth previous occasion.

Discharge pipe sensor temperature on fifth previous occasion.

Stop code on previous occasion.

Stop code on second previous occasion.

Stop code on third previous occasion.

Stop code on fourth previous occasion.

Stop code on fifth previous occasion.

Stop code on sixth previous occasion.

Stop code on seventh previous occasion.

Stop code on eighth previous occasion.

Stop code on ninth previous occasion.

Stop code on tenth previous occasion.

MED

AUTO

MED

AUTO

MED

AUTO

MED

AUTO

MED

AUTO

MED

AUTO

MED

AUTO

MED

AUTO

MED

AUTO

MED

AUTO

Content of complaint

Remote controller settings

Content of displayed data

Display content

Display results

Buzzer (Yes/No.)

RUN light (Times)

TIMER light (Times)

Temperature setting

Operation switching

Cooling

Heating

Cooling

Heating

Cooling

Heating

Cooling

Heating

Cooling

Heating

LoCooling

Judgment

Examiner

Remarks

Fan speed switching

Model

(g) Inspection procedures corresponding to detail of trouble

Sensor error

[Broken sensor wire, connector poor connection]

(Shortcircuit)

(Broken wire)

Current cut

[Open phase on compressor output terminal, compressor lock]

YES

¡ Check compressor wiring visually. ¡ Check insulation resistance. (1 MΩ or over) ¡ Check coil wire resistance. (Few Ω)

Does current cut operate when operating inverter with compressor wire disconnected?

Is output voltage applied to all 3 phases of power transistor?

Is there any shortcircuit?

Inspect compressor.

Defective inverter

Secure space for suction

and blow out.

If check results are normal, compressor is locked.

Is connector connection good?

YES

Replace PCB.

Correct connection.

Replace sensor.

Is sensor resistance value good?

◆ Sensor temperature characteristics (Room temp., indoor unit heat exchanger temp., outdoor unit heat exchanger temp., outdoor air temp.)

Temperature (˚C)

Resistance (kΩ)

40 50 60

–10

Temperature (˚C) Resistance (kΩ)Temperature (˚C) Resistance (kΩ)

0 164 70 8.7

5 127 75 7.3

10 99 80 6.2

15 78 85 5.3

20 62 90 4.5

25 50 95 3.9

30 40 100 3.3

35 32 105 2.9

40 26 110 2.5

45 21 115 2.2

50 17 120 1.9

55 14 125 1.6

60 12 130 1.4

65 10 135 1.3

◆ Discharge pipe sensor temperature characteristics

Outdoor unit error

[Broken power transistor broken compressor wire]

Compressor overheat

[Gas shortage, defective discharge pipe sensor]

Is output voltage applied to all 3 phases of power transistor? (Refer to page 53 for details)

Defective inverter

Is compressor wiring connected securely?

Connect securely.

Inspect compressor.

YES

Is Discharge pipe sensor resistance value good?

(Page 47)

Is sufficient quantity of refrigerant circulated?

Defective inverter

YES

Gas shortage

Connector connection check, resistance value check, replacement of discharge pipe sensor

Does trouble persist after charging gas?

Clogged capillary tube, etc.

Serial signal transmission error

[Wiring error including power cable, defective indoor/ outdoor unit PCB, error on power supply system]

Does error persist after power reset?

Is there any wrong connection on indoor/outdoor unit wiring?

Is DC 0~Approx. 12V detected between 2~3 terminals on indoor unit terminal block?

YES

Trouble by transient cause, not unit trouble.

Correct improper wire connection on indoor/ outdoor unit.

Defective indoor unit PCB

YES

Is DC 0~Approx. 12V detected between2~3 terminals on outdoor unit terminal block?

Is AC 220/230/240V applied between 1~2 on the outdoor side terminal block?

Defective indoor unit PCB. Check crossover wires.

Is there any problem on the power supply line (fuse, reactor, capacitor, etc.)?

Replace fuse, reactor or capacitor.

Defective outdoor unit PCB

Check crossover wires.

Indoor fan motor error

[Defective fan motor, defective PCB]

YES

Is connector connection good?

Is voltage applied to fan motor?

Defective fan motor

Correct connector connection.

Defective indoor unit PCB

Rotor lock

[Compressor defect, outdoor unit circuit defect]

YES

¡ Check compressor wiring visually. ¡ Check insulation resistance. (1 MΩ or over) ¡ Check coil wire resistance. (Few Ω)

Is output voltage applied to all 3 phases of power transistor?

Inspect compressor.

Defective inverter

If check results are normal, compressor is locked.

Outdoor fan motor error

[Defective fan motor, defective PCB]

YES

Is connector connection good?

Is voltage applied to fan motor?

Defective fan motor

Correct connector connection.

Defective indoor unit PCB

Phenomenon

Sensor

Shortcircuit Broken wire Cooling Release of continuous compressor operation command

Heating

Continuous compressor operation command is not released.

System can be operated normally.

Cooling

Heating High pressure control mode (Inverter stop command)

Cooling 1 in the table below.

Heating Normal system operation is possible.

Operation mode

Room temperature sensor

Continuous compressor operation command is not released.

Release of continuous compressor operation command

Continuous compressor operation command is not released. (Anti-frosting)

Hot keep (Indoor fan stop)

1 in the table below.

Heat exchanger sensor

Phenomenon

Sensor

Shortcircuit Broken wire

Cooling System can be operated normally.

Heating Defrosting is not performed.

Cooling System can be operated normally.

Heating Defrosting is not operated.

All modes

Operation mode

System can be operated normally.

Defrosting is performed for 10 minutes at approx. 1 hour.

System can be operated normally.

Defrosting is performed for 10 minutes at intervals of approx. 1 hour.

Compressor stop (There is no inverter output.)

Heat exchanger

Outdoor air temperature sensor

Discharge pipe sensor

Compressor overload protection is disabled. (Can be operated.)

Humidity Sensor

(1)

Note (1) The humidity sensor is included in the 50 type only.

1 Humidity sensor operation

Failure mode Control input circuit reading

Air conditioning system operation

1 Disconnected wire Humidity reading is 0% Operates in the Dry region

2 Disconnected wire Humidity reading is 0% Operates in the Dry region

12 Disconnected wire Humidity reading is 0% Operates in the Dry region

1 and 2 are short

Humidity reading is 100% Operates in the Cooling region.

circuited

Disconnected

wire

Short

Circuit

Remark: Do not perform a continuity check of the humidity sensor with a tester. If DC current is applied, it

could damage the sensor.

Humidity sensor element

Connector (CnF)

Humidity sensor assembly

(h) Phenomenon observed after shortcircuit, wire breakage on sensor.

(i) Indoor unit

(ii) Outdoor unit

(j) Inspection procedures of indoor electrical equipment

Notes (1) Since the communication timing signal is transmitted only when the

52C is turned ON, check it under the operating condition.

(2) Check the voltage on the terminal block.

¡ Power supply: Between 1~2 (AC 220/230/240V) ¡ Signal: Between 2~3 (Changing between DC 0~Approx. 12V)

YES

Is fuse (3.15A) blown?

Indoor electrical equipment are normal.

Is voltage applied between terminals 1~2 on terminal block? (AC 220/230/240V)

Is DC 0~12V detected between terminals 2~3 on terminal block?

Replace fuse.

Replace PCB.

(i) How to make sure of remote controller

Note (1) Check method of remote controller (a) Press the reset switch of the remote controller. (b) If all LCD are displayed after zero (0) display, it is basically normal.

MED

AUTO

HI POWER

ECONO

ON OFF

AM PM

(1)

Is remote

controller

normal?

YES

Again pushing operating switch

Operating the unit?

Does unit ON/OFF button operates?

Operating the unit.

YES

Remote controller defects

Abnormality is not found.

Replace the display.

Control problem on main unit

Is the unit

operable with remote

controller?

Defective remote controller

YES

Normal

Printed circuit

board

F2 (250V 20A)

S.IN

R.IN

Th4

Th5

Th6

CNB CNE CNA

CND

Power

transistor

20S

EEV

FMo

Y/GN

◆ Inspection of resistance value of discharge pipe

sensor

Remove the connector and check the resistance value.

See the section of sensor characteristics on page 47.

◆ Inspection of electronic expansion valve

To test if there is voltage.

◆

Check point of outdoor unit (20, 25, 35 type)

If the expansion valve does not operate as shown above, it is defective.

(Voltage is only applied to the electronic expansion valve when the valve opening

is being changed.)

Red to White

Red to Orange

Brown to Yellow

Brown to Blue

Normal if there is approximately DC 5 V 10 seconds

after the power asupply is turned on.

Color symbol

Y/GN

Black

Red

White

Yellow/Green

◆ Inspection of input to PCB

¡ Check the voltage between terminals

1~2 on the terminal block.

(It is normal if AC 220/230/240V

is detected.)

◆ Inspection of serial signal

Check the voltage between terminals

2~3on the terminal block.(It is normal

if the needle swing in the range of DC

0~Approx.12V)

CAUTION

HIGH VOLTAGE

High voltage is produced in the control box. Don’t touch

electrical parts in the control box for 5 minutes after the

unit is stopped.

Measure in this sectionOperation SW ON

8~10 sec.

Output voltage

(ACV)

(Example)

RUN light: 2 time flash

TIMER light: 2 time flash

◆ Inspection of resistance value of discharge pipe

sensor

Remove the connector and check the resistance value.

See the section of sensor characteristics on page 47.

◆ Inspection of electronic expansion valve

To test if there is voltage.

◆ Check point of outdoor unit (50 type)

If the expansion valve does not operate as shown above, it is defective.

(Voltage is only applied to the electronic expansion valve when the valve opening

is being changed.)

Red to White

Red to Orange

Brown to Yellow

Brown to Blue

Normal if there is approximately DC 5 V 10 seconds

after the power asupply is turned on.

◆ Inspection of input to PCB

◆ Power transistor inspection procedure

¡ Check the voltage between terminals

1~2 on the terminal block.

(It is normal if AC 220/230/240V

is detected.)

◆ Inspection of serial signal

Check the voltage between terminals

2~3on the terminal block.(It is normal

if the needle swing in the range of DC

0~Approx.12V)

For about 50 seconds. After being switched on,

the will be a delay of approximately one minute

depending on the conditions.

[Use a tester with a needle indicator for the inspection. (Do not use a

digital tester. Check in the AC 300 volt range.)]

(1) If there is a self-diagnosis display, inspect the compressor system

(burns, wiring mistakes, etc.) If no problems are found, check the

output of the power transistor.

(2) Output inspection procedure

Disconnect the terminals for the compresseor.

If an output such as the one shown in the figure on the right can

be measured, the power transistor and the circuit board for the

outdoor unit are normal.

CAUTION

HIGH VOLTAGE

High voltage is produced in the control box. Don’t touch

electrical parts in the control box for 5 minutes after the

unit is stopped.

Black

Brown

Red

Blue

White

Yellow/Green

Orange

Green

Y/GN

Color symbol













 







  

  

EEV

 

 

FMo

20S

F(250V 15A)

















































 





"#













(2) Servicing

(a) Evacuation

The evacuation is an procedure to purge impurities......noncondensable gas, air, moisture from the refrigerant equipment by using

a vacuum pump. Since the refrigerant R410A is very insoluble in water, even a small amount of moisture left in the refrigerant

equipment will freeze, causing what is called water clogging.

¡ Evacuation procedure

(i) Check to ensure that there is no internal pressure in the unit. If there is an internal pressure, it

should be relieved through the check joint.

(ii) Connect the service hoses of the gauge manifold to the check joint of the gas & liquid piping.

(iii) Connect a vacuum pump to the charge hose A . Repeat evacuation in the following sequence.

(b) Refrigerant charge

(i) Discharge refrigerant entirely from the unit and evacuate the unit.

Note: Addition of refrigerant without evacuation is unreasonable, because it will result in low charge or overcharge.

(ii) Keep the gauge manifold and connect a refrigerant cylinder to the unit.

(iii) Record the weight of the refrigerant cylinder on the balance. This is necessary for making sure of the charged refrigerant

amount.

(iv) Purge air from the charge hose A

Firstly loose the connecting portion of the charge hose A at the gauge manihold side and open the valve 3 for a few seconds,

and then immediately retighten it after observing that gas is blow out from the loosened portion.

(v) Open the valve 1 and 3 after discharging air from the charge hose A , then the liquid refrigerant begins flowing from the

cylinder into the unit. Be sure to erect the refrigerant cylinder upright to let liquid refrigerant flow into the unit.

(vi) When refrigerant has been charged into the system to some extent, refrigerant flow becomes stagnant, when that happens,

start the compressor in cooling cycle until the unit is filled with refrigerant to the specified weight.

(vii) Making sure of the refrigerant amount, close the valve 3

(viii) Disconnect the charge hose from the unit. Cover the valve ports of the refrigerant piping with caps and tighten them securely.

(ix) Check for gas leakage applying a gas leak detector along the piping line.

(x) Start the air conditioner and make sure of its operating condition......high side and low side pressures and temperature differ-

ence between suction air and outlet air.

Notes (1) Do not use the refrigerant pressure to expel air.

(2) Do not use the compressor for evacuation. (3) Do not operate the compressor in the vacuum condition.

Service hose

Liquid side

Gas side

Check joint

Charge hose

Vacuum pump

Refrigerant cylinder

Gauge manifold

Stop the vacuum pump.

Start the vacuum pump.

Compound pressure gauge indicates –0.1 MPa (–76 cmHg)

Operate the vacuum pump for more than 15 minutes after –0.1 MPa (–76 cmHg) is indicated.

Close low pressure valve 1 of gauge manifold.

1.1.7 REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL FOR AIR CONDITIONERS USING R410A

(These materials are extracted from document issued by The Japan Refrigeration and Air Conditioning Industry Association)

(1) Outline

(a) Refrigerant R410A

(i) Adoption of R410A in air conditioners

In 1974, it was pointed out that the ozone layer in the upper stratosphere (about 20 ~ 40 km above ground) might have been

damaged by the ozone depleting substances such as CFC (chlorofluorocarbon) and HCFC (hydrochlorofluorocarbon). Since that

time, many countries across the world have endeavored to take countermeasures against the ozone depletion.

As a refrigerant belonging to the HCFCs, the conventional refrigerant (R22) used in air conditioners also tends to deplete the ozone

layer. Therefore, complying with the provisions of the international regulations (i.e. Montreal Protocol concerning the Ozone

Depleting Substances) and national laws & Regulations concerned, it is necessary to replace R22 with other types of refrigerant

which do not deplete the ozone layer.

A refrigerant composed of hydrogen (H), fluorine (F) and carbon (C), is called an HFC and does not deplete the ozone layer. One

HFC’s is R410A whose pressure is about 1.6 times higher than R22 and whose energy efficiency is almost comparable to that of

R22 at the same refrigerant temperature.

(ii) Chemical characteristics of R410A

1) Chemical stability

Like R22, R410A is a chemically stable, less toxic and non-flammable refrigerant. However, as in the case of R22, the specific

gravity of its vapour is larger than that of air and should it leak in an airtight room it may stay at a low level and cause an

oxygen starvation accident. It may also, should it come in direct contact with fire, cause a poisonous gas to occur, so be sure to

handle it only in a well ventilated area.

2) Composition changes (Pseudo-azeotropic characteristics)

R410A is a pseudo-azeotropic mixed refrigerant composed of two constituents - R32 and R125. “Quasi-azeotropic” condition

refers to a state in which the dew-point curve and boiling-point curve - gas-liquid equilibrium curves (pressure constant) -

almost lie on top of each other, and a multi-constituent refrigerant having this chemical characteristic incurs less composition

changes even when evaporation (or condensation) as a phase change occurs. Consequently, even when refrigerant leaks from

the gas phase somewhere in the piping installation, the composition of circulated refrigerant incurs less changes.

Therefore, R410A can be treated in almost a same manner as a mono-constituent refrigerant like R22 is treated. When actually

charging R410A, however, do so from the liquid phase side by taking into account the phenomenon that, when put in a

cylinder, the composition changes a little between gas and liquid phases.

3) Pressure characteristics

As shown in Table 2, since R410A’s vapor pressure is about 1.6 times higher than that of R22 at the same temperature, perform

installation/service with special tools and materials which are exclusive for R410A and can withstand high pressure.

R410A R22

Composition R32/R125 R22

(wt%) (50/50) (100)

Molecular weight 72.6 86.5 Boiling point (°C) -51.4 -40.8 Vapor pressure (25°C, MPa) 1.56 0.94 Saturated vapor density (25°C, kg/m2) 64.0 44.4

Inflammability Nonflammable Nonflammable

Ozone depletion potential (ODP) 0 0.055

Global warming potential (GWP) 1730 1700

Source: List of thermophysical properties complied by the Japan society of

refrigeration and air conditioning, NIST REFPROP V5.10, etc.

Table 1. Comparison of thermophysical properties of R410A and

R22

Refrigerant R410A R22

Temperature (°C)

-20 0.30 0.14

0 0.70 0.40

20 1.35 0.81

40 2.32 1.43

60 3.73 2.33

65 4.15 2.60

Source: List of thermophysical properties complied by the Japan

society of refrigeration and air conditioning, NIST

REFPROP V5.10, etc.

Table 2. Comparison of saturated vapor pressure of

R410A and R22

unit: MPa

(iii) Lubricating oils for R410A

As the lubricating oils for R22, mineral oils, alkylbenze synthetic oils, etc. have so far been used. As R410A features less solubility

with these conventional lubricating oils such as mineral oils, the lubricating oils tend to stay within the refrigeration cycle. As the

lubricating oils highly soluble with R410A, ester, ethereal and other synthetic oils are available. However, as these synthetic oils

are very hygroscopic, they must be treated even more carefully than the conventional lubricating oils. Furthermore, if these

synthetic oils are mixed with mineral oils, alkylbenzene synthetic oils, etc., they may deteriorate, and block the capillary tubes, or

cause the compressor to fail. So, never mix these synthetic oils.

(b) Safety during installation/servicing

As R410A’s pressure is about 1.6 times higher than that of R22, improper installation/servicing may cause a serious trouble. By

using tools and materials exclusive for R410A, it is necessary to carry out installation/servicing safely while taking the following

precautions into consideration.

1) Never use refrigerant other than R410A in an air conditioner which is designed to operate with R410A.

2) If a refrigeration gas leakage occurs during installation/servicing, be sure to ventilate fully.

If the refrigerant gas comes into contact with fire, a poisonous gas may occur.

3) When installing or removing an air conditioner, do not allow air or moisture to remain in the refrigeration cycle. Otherwise,

pressure in the refrigeration cycle may become abnormally high so that a rupture or personal injury may be caused.

4) After completion of installation work, check to make sure that there is no refrigeration gas leakage.

If the refrigerant gas leaks into the room, coming into contact with fire in the fan driven heater, space heater, etc., a poisonous

gas may occur.

5) When an air conditioning system charged with a large volume of refrigerant (e.g.multi type air conditioner) is installed in a

small room, it is necessary to exercise care so that, even when refrigerant leaks, its concentration does not exceed the marginal

level.

If the refrigerant gas leakage occurs and its concentration exceeds the marginal level, an oxygen starvation accident may

result.

6) Be sure to carry out installation or removal according to the installation manual.

Improper installation may cause refrigeration trouble, water leakage, electric shock, fire, etc.

7) Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs please call a qualified air condi-

tioner technician or electrician.

Improper repair’s may result in water leakage, electric shock and fire, etc.

(2) Refrigerant piping installation

(a) Piping materials and joints used

For the refrigerant piping installation, copper pipes and joints are mainly used. Copper pipes and joints suitable for the refrigerant

must be chosen and installed. Furthermore, it is necessary to use clean copper pipes and joints whose interior surfaces are less

affected by contaminants.

(i) Copper pipes

It is necessary to use seamless copper pipes which are made of either copper or copper alloy and it is desirable that the amount of

residual oil is less than 40 mg/10m. Do not use copper pipes having a collapsed, deformed or discolored portion (especially on the

interior surface). Otherwise, the expansion valve or capillary tube may become blocked with contaminants.

As an air conditioner using R410A incurs pressure higher than when using R22, it is necessary to choose adequate materials.

Thicknesses of copper pipes used with R410A are as shown in Table 3. Never use copper pipes thinner than 0.8 mm even when it

is available on the market.

Thickness (mm)

Nominal

Outer diameter

R410A [ref.] R22

diameter (mm)

1/4 6.35 0.80 0.80

3/8 9.52 0.80 0.80

1/2 12.70 0.80 0.80

5/8 15.88 1.00 1.00

Table 3. Thicknesses of annealed copper pipes

(ii) Joints

For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants.

1) Flare joints Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm. In such a case, socket joints can be used. Sizes of flare pipe ends, flare joint ends and flare nuts are as shown in Tables 5~8 (see on page 58, 59) below. Also, union, half union, Tee-type union and elbow-type union shapes are generally used (see Fig 1).

Table 4.Minimum thicknesses of socket joints

Fig.1 Flare joints

Fig.2 Socket joints

Union

Half union

Tee

Elbow

Half elbow

2) Socket joints Socket joints are such that they are brazed for connections, and used mainly for thick pipings whose diameter is larger than 20 mm. Thicknesses of socket joints are as shown in Table 4. Socket, elbow-type and tee-type shapes are generally used (see Fig. 2).

Nominal Reference outer diameter Minimum joint thickness

diameter of copper pipe jointed (mm) (mm)

1/4 6.35 0.50

3/8 9.52 0.60

1/2 12.70 0.70

5/8 15.88 0.80

(b) Processing of piping materials

When performing the refrigerant piping installation, care should be taken to ensure that water or dust does not enter the pipe interior, that no other oil other than lubricating oils used in the installed air conditioner is used, and that refrigerant does not leak. When using lubricating oils in the piping processing, use such lubricating oils whose water content has been removed. When stored, be sure to seal the container with an airtight cap or any other cover. (i) Flare processing procedures and precautions

1) Cutting the pipe By means of a pipe cutter, slowly cut the pipe so that it is not deformed.

2) Removing burrs and chips If the flared section has chips or burrs, refrigerant leakage may occur. Carefully remove all burrs and clean the cut surface before installation.

3) Insertion of flare nut

Socket Socket with

different diameter

90° elbow A type

90° elbow B type

Fitting reducer

Tee

Tee with

different diameter

4) Flare processing

Make certain that a clamp bar and copper pipe have been cleaned.

By means of the clamp bar, perform the flare processing correctly.

Use either a flare tool for R410A or conventional flare tool.

Flare processing dimensions differ according to the type of flare tool. Be careful. When

using a conventional flare tool, be sure to secure “dimension A” by using a gage for size

adjustment.

øD

Fig.3 Flare processing dimensions

Table 5. Dimensions related to flare processing for R410A

Nominal Outer diameter Thickness

A (mm)

diameter (mm) (mm)

Flare tool for R410A

Conventional flare tool

Clutch type

Clutch type Wing nut type

1/4 6.35 0.8 0~0.5 1.0~1.5 1.5~2.0

3/8 9.52 0.8 0~0.5 1.0~1.5 1.5~2.0

1/2 12.70 0.8 0~0.5 1.0~1.5 2.0~2.5

5/8 15.88 1.0 0~0.5 1.0~1.5 2.0~2.5

Table 6. Dimensions related to flare processing for R22

Nominal Outer diameter Thickness

A (mm)

diameter (mm) (mm)

Flare tool for R410A

Conventional flare tool

Clutch type

Clutch type Wing nut type

1/4 6.35 0.8 0~0.5 0.5~1.0 1.0~1.5

3/8 9.52 0.8 0~0.5 0.5~1.0 1.0~1.5

1/2 12.70 0.8 0~0.5 0.5~1.0 1.5~2.0

5/8 15.88 1.0 0~0.5 0.5~1.0 1.5~2.0

Fig.4 Relations between flare nut and flare seal surface

Table 7. Flare and flare nut dimensions for R410A

Nominal Outer diameter Thickness

Dimension (mm)

Flare nut width

diameter (mm) (mm)

AB C D

1/4 6.35 0.8 9.1 9.2 6.5 13 17

3/8 9.52 0.8 13.2 13.5 9.7 20 22

1/2 12.70 0.8 16.6 16.0 12.9 23 26

5/8 15.88 1.0 19.7 19.0 16.0 25 29

[unit: mm]

(ii) Flare connecting procedures and precautions

1) Make sure that the flare and union portions do not have any scar or dust, etc.

2) Correctly align the processed flare surface with the union axis.

3) Tighten the flare with designated torque by means of a torque wrench. The tightening torque for R410A is same as that for

conventional R22. Incidentally, when the torque is weak, the gas leakage may occur. When it is strong, the flare nut may crack

and may be made nonremovable. When choosing the tightening torque, comply with values designated by manufacturers.

Table 9 shows reference values.

Note : When applying oil to the flare surface, be sure to use oil designated by the manufacturer. If any other oil is used, the lubricating oils may deteriorate and

cause the compressor to burn out.

(i) Types and storage of piping materials

Refrigerant piping materials for air conditioners are broadly classified into the following types.

As R410A features pressure about 1.6 times higher than R22, it is necessary to use a copper pipe which has a thickness stated in

Table 3 (see on page 56) and which contains less contaminants. It is necessary to carefully treat/store copper pipes so that they are

not collapsed, deformed or damaged. Due care must also be exercised so that foreign matters such as dust and water do not enter

the pipe interior.

A piping set’s open end is sealed with a cap, etc. When storing it, make sure that it is sealed securely. When storing a cladded

copper pipe or bare copper pipe, securely seal the opening with pinching, taping, etc.

Table 8. Flare and flare nut dimensions for R22

Nominal Outer diameter Thickness

Dimension (mm)

Flare nut width

diameter (mm) (mm)

ABCD

1/4 6.35 0.8 9.0 9.2 6.5 13 17

3/8 9.52 0.8 13.0 13.5 9.7 20 22

1/2 12.70 0.8 16.2 16.0 12.9 20 24

5/8 15.88 1.0 19.4 19.0 16.0 23 27

[unit: mm]

Table 9. Tightening torque of flare for R410A [Reference values]

Nominal Outer diameter Tightening torque diameter (mm) N·m (kgf·cm)

1/4 6.35 14~18 (140~180) 16 (160), 18 (180)

3/8 9.52 33~42 (330~420) 42 (420)

1/2 12.70 50~62 (500~620) 55 (550)

5/8 15.88 63~77 (630~770) 65 (650)

Refrigerant piping materials

Tightening torque of torque

wrenches available on the

market N·m (kgf·cm)

with heat insulation without heat insulation (bare copper pipe)

with flare processing without flare processing without flare processing

General name : (a) Piping set : (b) Copper pipe with insulation : (c) Bare copper pipe

(ii) Identification

1) Piping set

A copper pipe as piping set for R410A must have a thickness as stated in Table 3 (see on page 56), and, as shown in Tables 5

and 6 (see on page 58), it also differs from R22 in flare processing and flare nut dimensions. So, it is necessary to choose a

piping set suitable for R410A.

2) Copper pipe with insulation

Before using a copper pipe with insulation, make sure that it has a thickness designated for R410A.

3) Bare copper pipe

It is necessary to use a bare copper pipe which has a thickness designated in Table 3 (see on page 56) and contains less

contaminants. As the bare copper pipe surface is naked, it is necessary to treat it with exceeding care and adopt a means for

identification to prevent improper usage by making it easily discriminable from other piping materials.

(iii) Precautions before installation

Observe the following precautions when performing the piping connection at the site.

1) Keep any open ends of pipes be sealed with a cap, etc. until connected with the equipment.

2) Exercise great care when performing piping installation on a rainy day.

When water enters into the piping, the lubricating oil may deteriorate and cause the equipment to fail.

3) Carry out the piping connection in as short a time as possible.

If the piping is left open for a long period, fully purge the interior with nitrogen gas or dry it with a vacuum pump.

(d) Brazing

(i) Processing the connected parts

As brazing is molten between the joined surfaces to yield high adhesive strength, it is necessary to secure a wide enough space to

be joined and also an adequate clearance between the joined surfaces. Copper pipe joints’ minimum insertion depths, outer pipe

diameters and clearances between outer and inner pipe diameters are as shown in Table 10. In the case of bronze brazing filler,

when the clearance is about 0.05~0.1mm, the pipes can be connected most strongly.

(ii) Brazing filler metal

1) Alloy brazing filler

An alloy mainly composed of silver and copper is used to join iron, copper or copper alloy. Although it excels in solderability,

it is relatively expensive.

2) Phosphor bronze brazing filler

Phosphor bronze brazing filler is generally used to join copper or copper alloy.

3) Low temperature solder

An alloy of tin and lead. An ordinary type of solder. Since it is weak in adhesive strength, it should not be used for refrigerant

pipe brazing.

* Cautions:

a) BCuP tends to react with sulphur and produce a fragile compound water solution, which may cause a gas leakage. So,

use any other type of brazing filler at a hot spring resort, etc., and coat the surface with a paint.

b) When performing brazing again at the time of servicing, use the same type of brazing filler.

Table 10. Copper pipe joints’ minimum insertion depths and clearances

Outer pipe diameter Clearance

D (A-D) × 1/2

(mm) (mm)

5~8 6 0.05~0.35

8~12 7 0.05~0.35

12~16 8 0.05~0.45

Minimum insertion depth

(mm)

* When joining the pipes, either the pipe ends are processed, or pipes are connected by brazing with a socket joint.

(iii) Flux

1) Reasons for the use of flux

• By removing the oxide film and any foreign matter on the metal surface, it assists the flow of brazing filler.

• In the brazing process, it prevents the metal surface from being oxidized.

• By reducing the brazing filler’s surface tension, the brazing filler adheres better to the treated metal.

2) Properties required for flux

•Temperature at which flux is active coincides with the brazing temperature.

• Due to a wide effective temperature range, flux is hard to carbonize.

• It is easy to remove slag after brazing.

• The corrosive action to the treated metal and brazing filler is negligible.

• Excels in coating performance and is harmless to the human body.

As the flux works in a complicated manner as described above, it is necessary to choose an adequate type of flux according to

the type and shape of treated metal, type of brazing filler and brazing method, etc.

3) Types of flux

• Incorruptible flux

Generally, it is a compound of borax and boric acid. Effective in cases where the brazing temperature is higher than 800°C.

• Activated flux

Most of fluxes generally used for silver brazing fall under this type.

It features an increased oxide film removing capability due to the addition of compounds such as potassium fluoride,

potassium chloride and sodium fluoride, to the borax-boric acid compound.

* Cautions:

1 Remove the flux after brazing.

2 When chlorine contained in the flux stays within the pipe, the lubricating oil deteriorates. So, use a flux which does not

contain chlorine.

3 When adding water to the flux, use water which does not contain chlorine (e.g. distilled water or ion-exchange water).

(iv) Brazing

As brazing requires sophisticated techniques and experiences, it must be performed by a qualified person.

In order to prevent the oxide film from occurring in the pipe interior during brazing, it is effective to proceed with brazing while

letting dry nitrogen gas (N

2) flow.

1) Attach a reducing valve to the nitrogen gas cylinder

2) Use a copper pipe to direct the nitrogen gas into the piping, and attach a flowmeter to the nitrogen gas cylinder.

3) Apply a seal onto the clearance between the piping and inserted pipe for the nitrogen gas in order to prevent the nitrogen gas

from flowing backward.

4) When the nitrogen gas is flowing, be sure to keep the piping end open.

5) Adjust the flow rate of nitrogen gas so that it is lower than 0.05m

/h, or 0.02MPa (0.2kgf/cm2) by means of the reducing valve.

6) After taking the steps above, keep the nitrogen gas flowing until the piping cools down to a certain extent (i.e. temperature at

which pipes are touchable with finger).

7) Completely remove the flux after brazing.

* Cautions during brazing

1 General cautions

1) The brazing strength should be high as required.

2) After operation, airtightness should be kept under a pressurized condition.

3) During brazing do not allow component materials to become damaged due to overheating.

4) The refrigerant pipe work should not be come blocked with scale or flux.

5) The brazed part should not restrict the flow in the refrigerant circuit.

6) No corrosion should occur from the brazed part.

2 Prevention of overheating

Due to heating, the interior and exterior surfaces of treated metal may oxidize. Especially, when the interior of the

refrigerant circuit oxidizes due to overheating, scale occurs and stays in the circuit as dust, thus exerting a fatally adverse

effect. So, make brazing at adequate brazing temperature and with a minimum of heating area.

3 Overheating protection

In order to prevent components near the brazed part from overheating damage or quality deterioration due to flame or

heat, take adequate steps for protection such as (1) by shielding with a metal plate, (2) by using a wet cloth, and (3) by

means of heat absorbent.

4 Movement during brazing

Eliminate all vibration during brazing to protect brazed joints from cracking and breakage.

5 Oxidation preventive

In order to improve the brazing efficiency, various types of antioxidant are available on the market. However, the con-

stituents of these are widely varied, and some are anticipated to corrode the piping materials, or adversely affect HFC

refrigerant, lubricating oil, etc. Exercise care when using an oxidation preventive.

(3) Installation, removal and servicing

(a) Tools for R410A

In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being charged accidentally, the service

port diameter of the outdoor unit control valve (3-way valve) has been changed. Also, to increase the pressure resisting strength,

flare processing dimensions and sizes of opposite sides of flare nuts (for copper pipes with nominal diameters 1/2 and 5/8) have

been changed. During installation/service, therefore, prepare tools exclusive for R410A shown in (i) on page 63 and general tools

shown in (ii) on page 64.

Fig.5 Prevention of oxidation during brazing

Flow meter

Stop valve

Reducing

valve

Piping

Rubber plug for sealing

From the nitrogen cylinder

Nitrogen gas

(i) Tools exclusive for R410A

1) Gauge manifold

• As R410A is characterized by high pressure, conventional tools cannot be used.

• In order to prevent any other refrigerant from being charged accidentally, each port of the manifold has been changed in

shape.

2) Charge hose

• As R410A is characterized by high pressure, the pressure resistance of the charge hose has been increased. The material has

also been changed to an HFC resistant type, and, as in the case of each port of the manifold, the hose cap size has been

changed. Furthermore, for prevention of gas pressure reaction, a charge hose with a valve placed near the cap is also

available.

3) Electronic balance for refrigerant charging

• As R410A belonging to the HFCs features high pressure and high evaporating speed, when R410A is charged by using a

charging cylinder, R410A in the cylinder cannot be kept in a liquefied state and gasified refrigerant bubbles in the charging

cylinder, it becomes difficult to read values. Therefore, it is advisable to adequately use an electronic balance for refrigerant

charging.

• An electronic balance for refrigerant charging has higher strength due to its structure with four points of support for refrig-

erant cylinder weight detection. As the charge hose connecting part has two ports-one for R22 (7/16 UNF 20 threads per

inch) and the other for R410A (1/2 UNF 20 threads per inch) - it can also be used for charging the conventional refrigerant.

•Two types of electronic balance for refrigerant charging are available - one for 10kg cylinder and the other for 20kg cylinder.

Electronic balance for 10kg cylinder ...... precision ± 2g

Electronic balance for 20kg cylinder ...... precision ± 5g

• Refrigerant is charged manually by opening/closing the valve.

4) Torque wrench (for nominal diameters 1/2 and 5/8)

• Along with changes in flare nut sizes for enhanced pressure resisting strength, torque wrenches for R410A differ in opposite

side size.

Table 11. Differences between conventional high/low pressure gauges and those for R410A

Conventional gauges Gauges exclusive for R410A

High pressure -0.1~3.5MPa -0.1~5.3MPa

gauge (red) -76 cmHg~35 kgf/cm

-76 cmHg~53 kgf/cm

Compound -0.1~1.7MPa -0.1~3.8MPa

gauge (blue) -76 cmHg~17 kgf/cm

-76 cmHg~38 kgf/cm

Table 12. Differences in port size between conventional manifold and that for R410A

Conventional manifold Manifold for R410A

Port size

7/16 UNF 1/2 UNF

20 threads per inch 20 threads per inch

Table 14. Differences between conventional wrenches and those for R410A

Conventional torque wrench Torque wrench for R410A

For 1/2 (opposite side 24mm × 55N·m 26mm × 55N·m

× torque) (550 kgf·cm) (550 kgf·cm)

For 5/8 (opposite side 27mm × 65N·m 29mm × 65N·m

× torque) (650 kgf·cm) (650 kgf·cm)

Table 13. Differences between conventional charge hose and that for R410A

Conventional charge hose Charge hose for R410A

3.4 MPa (34 kgf/cm2) 5.1 MPa (51 kgf/cm2)

17.2 MPa (172 kgf/cm2) 27.4 MPa (274 kgf/cm2)

Engineering material NBR rubber

HNBR rubber

internally coated with nylon

Cap size

7/16 UNF 1/2 UNF

20 threads per inch 20 threads per inch

Pressure resistance

Normal pressure

Breaking pressure

5) Flare tool (clutch type)

•A flare tool for R410A is provided with a large clamp bar receiving hole so that the projection of the copper pipe from the

clamp bar can be set at 0~0.5 mm in flare processing, and also features higher spring strength for increased expansion pipe

torque. This flare tool can also be used for R22 copper pipe.

6) Gauge for projection adjustment (used when flare processing is made by using conventional flare tool [clutch type])

•

A gauge 1.0 mm in thickness which helps in easily setting the projection of the copper pipe from the clamp bar at 1.0~1.5 mm.

7) Vacuum pump adapter

• It is necessary to use an adapter for preventing vacuum pump oil from flowing back to the charge hose. The charge hose

connecting part has two ports - one for conventional refrigerant (7/16 UNF 20 threads per inch) and the other for R410A. If

the vacuum pump oil (mineral) mixes with R410A, a sludge may occur and damage the equipment.

8) Refrigerant cylinder

•A refrigerant cylinder exclusive for R410A comes identified with refrigerant name and is coated with pink paint as desig-

nated by the ARI, U.S.A.

9) Charge port and packing for refrigerant cylinder

• According to the charge hose’s cap size, a charge port with 1/2 UNF 20 threads per inch and corresponding packing are

required.

10) Gas leakage detector

•A high sensitivity gas leakage detector exclusive for HFC refrigerant is used. In the case of R410A, the detection sensitivity

is about 23g per year.

(ii) General tools

1) Vacuum pump

2) Torque wrench

for 1/4: opposite side 17 mm × for 1/4: opposite side 17 mm × for 3/8: opposite side 22 mm ×

3) Pipe cutter

4) Reamer

5) Screwdriver (+, -)

6) Hacksaw

(iii) Applicability of R410A tools to R22 model

7) Hole core drill (ø65 or 70)

8) Hexagonal wrench (opposite side 4 or 5 mm)

9) Spanner, or monkey wrench

10) Tape measure

11) Thermometer

12) Clamping ampere meter

13) Insulation resistance tester (mega tester)

14) Electro circuit tester

15) Pipe bender

(16 N·m) (160 kgf·cm)

(18 N·m) (180 kgf·cm) (42 N·m) (420 kgf·cm)

Table 15. Applicability of R410A tools to R22 model

Tools for R410A Applicable to R22 model

a) Gauge manifold ⳯

b) Charge hose ⳯

c) Electronic balance for refrigerant charging 䡬

d) Torque wrench (nominal diameter 1/2, 5/8) ⳯

e) Flare tool (clutch type) 䡬

f) Gauge for projection adjustment* 䡬

g) Vacuum pump adapter 䡬

h) Refrigerant cylinder ⳯

i) Charge port and packing for refrigerant cylinder ⳯

j) Gas leakage detector ⳯

* Used when conventional flare tool (clutch type) is used.

Note: For inquiry, contact your agent.

(b) New installation work (when using new refrigerant piping)

(i) Air purge by vacuum pump and gas leakage inspection (see Fig. 6)

1) Connect the charge hose to the outdoor unit. 1

2) Connect the charge hose to the vacuum pump adapter. 2 At this time, keep the control valves in the fully closed position. 3 4

3) Place the handle Lo in the fully opened position 5, and turn on the vacuum pump’s power switch. During this step, perform evacuating (about 10 ~ 15 minutes); for the evacuating time, refer to the equipment manufacturer’s manual.

4) When the compound gauge’s pointer has indicated -0.1 MPa (-76 cmHg) 6, place the handle Lo in the fully closed position 5, and turn OFF the vacuum pump’s power switch Keep this state for 1~2 minutes, and ascertain that the compound gauge’s pointer does not return.

5) Fully open the control valves. 3 4

6) Detach the charge hoses. 1 2

7) Tightly secure the cap on the service port. 7

8) After securing the caps on the control valves, check the caps’ periphery if there is any gas leakage. 3 4 7

(ii) Additional refrigerant charging required for refrigerant piping length longer than standard length (The following steps should be

taken following the step e) in (1) above. See Fig. 7)

1) Set the refrigerant cylinder to the electronic balance, and connect the connecting hoses on the cylinder and electronic balance’s connecting port. * Caution:

Be sure to make setting so that liquid can be charged. When using a cylinder equipped with a siphon, liquid can be charged without turning it upside down.

2) Connect the gauge manifold’s charge hose to the electronic balance’s connecting port. 3 2

3) Open the refrigerant cylinder’s valve, and, after opening the charging valve a little, close it. 1 2

4) After making zero (0) adjustment, open the charging valve and, by opening the gauge manifold’s valve Lo, charge the liquid refrigerant. 2 5 (Before handling the electronic balance, refer to its instruction manual).

5) When the designated amount of refrigerant could not be charged, make additional charging bit by bit by cooling operation (for the amount of each addition, follow the instruction manual prepared by the equipment manufacturer). If the first additional charging was not enough, make the second additional charging after about one minute in the same manner as the first additional charging. * Caution:

Be sure never to charge a large amount of liquid refrigerant at once to the unit in cooling mode, since liquid is charged from the gas side.

Fig.6 Configuration of air purge by vacuum pump

1 Charge hose

3 Control valve (2-way)

5 Handle Lo

6 Compound pressure

gauge

Gauge manifold

8 Handle Hi (always closed)

2 Charge hose

Vacuum pump adapter

Vacuum pump

7 Service port

4 Control valve

(3-way)

-76cmHg

Caution:

• Be sure to use the vacuum pump, vacuum pump adapter and

gauge manifold to refer to their instruction manuals beforehand.

• Ascertain that the vacuum pump is filled with oil to the level

designated on the oil gauge.

6) After charging liquid refrigerant into the air conditioner by closing the charging valve, stop operation by fully closing the gauge manifold’s valve Lo. 2 5

7) Quickly remove the charge hose from the service port. 6

When stopped halfway, refrigerant being cycled will be released.

8) After securing the caps on the service port and control valve, check the caps’ periphery to see if there is any gas leakage. 6 7

(i) Removing the unit

1) Recovery of refrigerant from the outdoor unit by pump down

• At the time of pump down, use a gauge manifold exclusive for R410A.

• Operating the unit in forced cooling mode, recover refrigerant from the outdoor unit.

(For details of reclaiming steps and precautions, see the instruction manual prepared by the equipment manufacturer)

* Caution:

In the case of an outdoor unit which is incapable of pump down, use a refrigerant recovery unit.

2) Removing the indoor/outdoor units

• Remove the piping and wiring between the indoor and outdoor units.

•Tighten the outdoor unit’s control valves and service port with the specified torque.

•Tighten the capped flare nuts at the indoor/outdoor units connecting part with the specified torque.

• Remove the indoor/outdoor units.

* Caution:

When storing the indoor unit piping in its original position, be careful not to break the piping.

(ii) Installing the unit

1) Proceed with the installation following the steps described in “ (b) New installation work”.

(d) Replacing the unit (Never use the existing refrigerant piping)

Use a brand-new refrigerant piping (1) when replacing the air conditioner using the conventional refrigerant (R22) with an air

conditioner using the alternative refrigerant (R410A) or (2) even when replacing the air conditioner using the alternative refrigerant

(R410A) with another air conditioner using R410A, as a problem may occur due to differences in pressure characteristics of refrig-

erant or differences in type of lubricating oil (air conditioners using R410A do not always use the same type of the lubricating oils).

(e) Retrofitting

Do not operate the air conditioner which has used the conventional refrigerant (R22) by charging the alternative refrigerant (R410A).

Otherwise, the equipment may cease to function normally and go wrong, or even cause serious problems such as rupture of the

refrigeration cycle.

Fig.7 Configuration of additional refrigerant charging

Opened

Electronic balance for refrigerant charging

Charging

valve

Refrigerant cylinder

(with syphon)

Service port

(Gas side)

(Liquid side)

Control valve (2-way)

Opened

Service port 6

Control valve (3-way)

(Indoor unit)

(Outdoor unit)

(f) Refrigerant recharging at servicing

When it becomes necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following

steps.

(For details, see the instruction manual prepared by the equipment manufacturer)

1) Connect the charge hose to the outdoor unit’s service port.

2) Connect the charge hose to the vacuum pump adapter. At this time, keep the control valves in the fully opened position.

3) Place the handle Lo in the fully opened position, and turn ON the vacuum pump’s power source. (For the evacuating time, refer

to the equipment manufacturer’s manual)

4) When the compound gauge’s pointer has indicated -0.1 MPa (-76 cmHg), place the handle Lo in the fully closed position, and

turn OFF the vacuum pump’s power source. Keep this state for 1 ~ 2 minutes, and ascertain that the compound gauge’s pointer

does not return.

5) Charge liquid refrigerant by using the electronic balance according to the steps described in Section (b)(ii) (pages65, 66).

(4) Refrigerant recovery

(a) Recovering procedures

The following procedures for refrigerant recovery represent general procedures, and they may differ between actual cases depend-

ing upon the type of refrigerant recovering equipment. The connecting and handling methods for different type of refrigerant

recovering equipment may also differ. So, ascertain the details by referring to the respective instruction manuals, etc.

(i) Checks prior to recovering procedures

1) Checking the refrigerant recovering equipment

1 Gas leakage [If there is any malfunction, repair it]. 2 Oil separator [Drain the residual oil]. 3 Recovering equipment weighing function, overcharge preventing function (float switch), moisture indicator, drier and

other accessory functions [should be adjusted or replaced where necessary].

4 Electrical circuit

2) Checking the accessories to the refrigerant recovering equipment

(ii) Preparations for recovering procedures

1) Installation of refrigerant recovering equipment

Install the equipment in a place which satisfies the following requirements as much as possible.

1 Ambient temperature is higher than 0°C and lower than 40°C. 2 A flat and dry floor. 3 A place as close to the air conditioner as possible.

2) Preparation of recovering cylinder

A recovering cylinder should be such that it does not go against prohibitions, and is suitable for refrigerant recovered.

3) Connect to the power source

4) Preparations for air conditioner subjected to refrigerant recovery 1 When it is possible to run the air conditioner subjected to refrigerant recovery, perform pump down operation so that

refrigerant is contained in the outdoor unit (condenser side).

• Carry out the pump down operation after confirming the specification of the air conditioner subjected to refrigerant

recovery.

2 If there is any clogging part (ex. the electronic expansion valve, etc.), fully open such part.

(iii) Connection of refrigerant recovering equipment

1) Connect the air conditioner subjected to refrigerant recovery to the refrigerant recovering equipment. 1 When there is a service port (port for recovery):

Make connection to the service port (port for recovery) by using a gauge manifold and charge hose.

2 When there is no service port (port for recovery):

Make connection in a manner similar to 1 above by using a piercing valve.

2) Connect the refrigerant recovering equipment to the recovering cylinder.

Recovering cylinder

Gauge manifold

(Intake

port)

(Discharge

port)

Refrigerant recovering equipment

Air conditioner

subjected to

recovery

(iv) Recovering procedures

1) According to the instructions for handling the refrigerant recovering equipment (described in the attached instruction manual),

operate the equipment to recover refrigerant.

2) During the operation, take care of the following cautions. 1 Ascertain that the refrigerant recovering equipment is running as required and always monitor the state of operation so that

adequate steps can be taken in an emergency.

2 During the operation, remain at work site to ensure safety. 3 If you have to leave your work site for any unavoidable reason, stop the operation after ascertaining that the recovering

cylinder is not overcharged.

3) During the operation, if the refrigerant recovering equipment’s overcharging prevention mechanism operates and the equip-

ment stops automatically, replace the recovering cylinder with an empty one.

4) If the pressure gauge’s reading increases after a short time from the accomplishment of recovery and automatic stoppage of the

refrigerant recovering equipment, restart the equipment and, if it stops again, finish the recovery.

(v) Procedures after recovery

1) Close the valves on the air conditioner subjected to refrigerant recovery, the refrigerant recovering equipment and the recover-

ing cylinder.

2) Detach the recovering cylinder charged with refrigerant and store it as required by law.

(b) Accessories/tools

In order to carry out R410A recovery, a variety of accessories/tools are required.

Shown below are standard accessories.

(i) Recovering cylinder

• Use a recovering cylinder designated by the equipment manufacturer.

•A detachable cylinder must be such that it complies with the laws and regulations concerned.

• Do not use an ordinary cylinder as a recovering cylinder.

Note 1: A cylinder available when R410A was purchased, is a borrowed one.

Note 2: As a cylinder available when R410A was purchased, is provided with a check valve, it cannot be used as a recovering

cylinder.

•Types (by function)

• Caution

It is prohibited by law to recover R410A into a throw-away service can or one-way cylinder.

(ii) Drier

•A desiccant container for removing the water content of R410A.

•A drier should be prepared as expendables.

• Keep the drier sealed just before fitting it.

• Required to protect the R410A recovering equipment.

(iii) Connection hose

1) Charge port and charge port packing

• Usually, it is sold independently of a refrigerant cylinder.

• In the case of a two-port cylinder, the diameter may be special.

Inquire the manufacture for confirmation.

•A packing is expendables.

Fig.8 Cylinder types

Valve

Valve for liquid

Valve for gas

Liquid

Valve for liquid the tube is inserted to a level close to the cylinder bottom.

Valve for gas (for gas releasing)

Signal line Float

Liquid

(a) Basic type

• 1-port valve

• Can be used for R410A recovery.

• Inverted when delivering liquid R410A.

(b) 2-port valve type

• Capable of delivering liquid R410A or releasing gas in the upright position.

• Convenient for servicing.

cylinder

•With a built-in float (signal) for prevention of overcharging

(c)

}

Charge port

2) Charge hose (pressure resistant hose for fluorocarbon) and packing

• It is 1/4B in thickness and available in various lengths, etc.

• Use a hose whose pressure resisting performance is higher than 5.2 MPa (52 kg/cm

G).

• Generally, a setting fixture is provided only on one end.

(iv) Gauge manifold

• The most important service tool for refrigeration and air conditioner.

•Widely used when charging/recovering R410A while checking gas pressure.

(v) Tube piercing valve

1) A tool used to make a hole for recovery in the copper pipe when recovering R410A from equipment which has no port for

charging or recovering gas. Various types are available on the market and given various names.

2) As the piercing edge tends to wear, it is necessary to treat this valve as semi-expendables.

3) As vacuum rises, air tends to be inhaled from the hole. So, care must be exercised.

(vi) Vacuum pump

Used to evacuate the recovering equipment and recovering cylinder.

Setting fixture

Hose packing

Compound gauge

Pressure gauge

Stop valve

Gauge manifold

Charge hose

Piercing pliers

Piercing valve

Suction port

Exhaust port

CONTENTS

1.2.1 GENERAL INFORMATION ....................................................................... 71

(1) Specific features.................................................................................... 71

(2) How to read the model name ............................................................... 71

1.2.2 SELECTION DATA .................................................................................... 72

(1) Specifications ........................................................................................ 72

(2) Range of usage & limitations ............................................................... 74

(3) Exterior dimensions .............................................................................. 74

(4) Piping system ........................................................................................ 75

(5) Selection chart....................................................................................... 76

1.2.3 ELECTRICAL DATA .................................................................................. 77

(1) Electrical wiring ..................................................................................... 77

1.2.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ............. 78

(1) Operation control function by remote control switch ....................... 78

(2) Unit ON/OFF button ............................................................................... 80

(3) Power blackout auto restart function .................................................. 80

(4) Custom cord switching procedure ...................................................... 81

(5) Flap and louver control......................................................................... 81

(6) Comfortable timer setting..................................................................... 82

(7) Sleep timer operation............................................................................ 82

(8) Outline of heating operation ................................................................ 83

(9) Outline of cooling operation ................................................................ 86

(10) Outline of dehumidifying operation..................................................... 87

(11) Outline of automatic operation ............................................................ 88

(12) Outline of fan operation ........................................................................ 89

(13) Outline of clean operation .................................................................... 89

(14) Outline of allergen clear operation ...................................................... 89

(15) ECONOMY operation............................................................................. 91

(16) External control (remote display)/control of input signal ................. 91

(17) Operation permission/prohibition control .......................................... 92

(18) Protective control function................................................................... 93

1.2.5 APPLICATION DATA ................................................................................100

(1) Selection of location for installation ................................................... 101

(2) Installation of indoor unit ..................................................................... 102

(3) Installation of outdoor unit ................................................................... 105

(4) Refrigerant piping ................................................................................. 105

(5) Test run................................................................................................... 106

(6) Precautions for wireless remote control installation and

operation ................................................................................................108

(7) Installation of wired remote control and super link adapter

(SC-AD-E) (Optional parts) ................................................................... 109

1.2.6 MAINTENANCE DATA .............................................................................. 116

(1) Troubleshooting procedures for electrical equipment ...................... 116

(2) Servicing ................................................................................................ 135

1.2.7 REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL

FOR AIR CONDITIONERS USING R410A ...............................................135

Over heat of compressor

Error of signal transmission

Outdoor fan motor error

1.2.1 GENERAL INFORMATION

(1) Specific features

The “MITSUBISHI HEAVY INDUSTRIES, LTD.” room air-conditioner: SRK series are of split and wall mounted type and the unit

consists of indoor unit and outdoor unit with refrigerant precharged in factory. The indoor unit is composed of room air cooling or

heating equipment with operation control switch and the outdoor unit is composed of condensing unit with compressor.

(a) Inverter (Frequency converter) for multi-steps power control

¡ Heating/Cooling

The rotational speed of a compressor is changed in step in relation to varying load, to interlock with the indoor and outdoor

unit fans controlled to changes in frequency, thus controlling the power.

¡ Allowing quick heating/cooling operation during start-up period. Constant room temperature by fine-tuned control after the

unit has stabilized.

(b) Fuzzy control

¡ Fuzzy control calculates the amount of variation in the difference between the return air temperature and the setting tempera-

ture in compliance with the fuzzy rules in order to control the air capacity and the inverter frequency.

The Flap & louver can be automatically controlled by operating wireless remote control.

¡Flap swing : The flaps swing up and down successively. ¡Louver swing : The louvers swing left and right successively. ¡Multi-directional Air Flow : Activating both up/down air swing and left/right air swing at the same time results in a multi-

directional air flow.

¡Memory flap : Once the Flap & louver position is set, the unit memorizes the position and continues to operate

at the same position from the next time.

(d) Self diagnosis function

¡ We are constantly trying to do better service to our customers by installing such judges that show abnormality of operation as

follows.

Outdoor heat exchanger sensor error

Discharge pipe temp. sensor error

Outdoor temperature sensor error

2 time flash

4 time flash

RUN light keeps flashing

1 time flash

Trouble of outdoor unit

Over current

Current cut

2 time flash

3 time flash

RUN light

1 time flash

5 time flash

TIMER light

R410A models

Series No.

Inverter type

Product capacity

Wall mounted type

Split type room air-conditioner

(2) How to read the model name

Example : SR K 63 Z E - S1

Room temperature sensor error

Indoor fan motor error

Heat exchanger sensor error

2 time flash

6 time flash

TIMER light

1 time flash

RUN light

Rotor lock

6 time flash

7 time flash

2 time flash

RUN light

2 time flash

Item

Model

SRK63ZE-S1 SRC63ZE-S1

Cooling capacity

(1)

W 6300 (900~7100)

Heating capacity

(1)

W 7100 (900~9000)

Power source 1 Phase, 220-240V, 50Hz

Cooling input kW 1.84 Running current (Cooling) A 8.4/8.1/7.7 Heating input kW 1.86 Running current (Heating) A 8.5/8.2/7.8 Inrush current A 8.5/8.2/7.8 COP Cooling: 3.42 Heating: 3.82

Cooling

Sound level Hi 43, Me 39, Lo 33, ULo 26 47

Noise level

Power level

58 62

Heating

Sound level Hi 44, Me 38, Lo 32, ULo 27 48

Power level 59 63

Exterior dimensions

Height × Width × Depth

318 × 1098 × 248 750 × 880 × 340

Color Yellowish white Stucco white Net weight kg 15 59 Refrigerant equipment

Compressor type & Q’ty

– TNB220FLBM1 (Twin rotary type) × 1

Motor kW – 1.3

Starting method – Line starting Heat exchanger Slit fins & inner grooved tubing Straight fin & inner grooved tubing Refrigerant control Capillary tubes + Electronic expansion valve Refrigerant

(3)

kg R410A 1.9 (Pre-Charged up to the piping length of 15m) Refrigerant oil R 0.67 (MEL56) Deice control Microcomputer control

Air handling equipment

Fan type & Q’ty

Tangential fan × 1 Propeller fan × 1

Motor W 46 86

(Cooling) 18.5 46

Air flow (at High)

(Heating)

CMM

21 46

Air filter, Q’ty Polypropylene net (washable) × 2–

Shock & vibration absorber – Cushion rubber (for compressor) Electric heater –– Operation control

Operation switch

Wireless-Remote control –

Room temperature control Microcomputer thermostat – Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)

Safety equipment

O.D mm (in) Liquid line: φ6.35 (1/4″) Gas line: φ15.88 (5/8″) Connecting method Flare connecting Attached length of piping Liquid line: 0.70m

Gas line : 0.63m

–

Insulation Necessary (Both sides) Drain hose Connectable Power source supply Terminal block (Screw fixing type)

Size × Core number 1.5 mm2 × 4 cores (Including earth cable)

Connection wiring

Connecting method Terminal block (Screw fixing type)

Accessories (included)

Mounting kit, Clean filter (Allergen clear filter × 1, Photocatalytic washable deodorizing filter × 1)

Optional parts Wired-Remote control

Notes (1) The data are measured at the following conditions.

1.2.2 SELECTION DATA

(1) Specifications

Model SRK63ZE-S1 (Indoor unit)

SRC63ZE-S1 (Outdoor unit)

Item Indoor air temperature Outdoor air temperature

Standards

Operation DB WB DB WB

Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612

Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612

(2) The operation data are applied to the 220/230/240V districts respectively.

(3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.

(Purging is not required even for the short piping.)

If the piping length is longer, when it is 15 to 30 m, add 25g refrigerant per meter.

Operation data

(1)(2)

Refrigerant

piping

The piping length is 7.5m.

(220/230/240V)

Item

Model

SRK71ZE-S1 SRC71ZE-S1

Cooling capacity

(1)

W 7100 (900~8000)

Heating capacity

(1)

W 8000 (900~10500)

Power source 1 Phase, 220-240V, 50Hz

Cooling input kW 2.21

Running current (Cooling) A 10.1/9.7/9.3

Heating input kW 2.21

Running current (Heating) A 10.1/9.7/9.3

Inrush current A 10.1/9.7/9.3

COP Cooling: 3.21 Heating: 3.62

Cooling

Sound level Hi 45, Me 40, Lo 34, ULo 26 52

Noise level

Power level

60 67

Heating

Sound level Hi 46, Me 40, Lo 34, ULo 27 49

Power level 60 64

Exterior dimensions

Height × Width × Depth

318 × 1098 × 248 750 × 880 × 340

Color Yellowish white Stucco white Net weight kg 15 59 Refrigerant equipment

Compressor type & Q’ty

– TNB220FLBM1 [Twin rotary type] × 1

Motor kW – 1.3

Starting method – Line starting

Heat exchanger Slit fins & inner grooved tubing Straight fin & inner grooved turbing Refrigerant control Capillary tubes + Electronic expansion valve Refrigerant

(3)

kg R410A 1.9 (Pre-Charged up to the piping length of 15m) Refrigerant oil R 0.67 (MEL56) Deice control Microcomputer control

Air handling equipment

Fan type & Q’ty

Tangential fan × 1 Propeller fan × 1

Motor W 46 86

(Cooling) 20 56

Air flow (at High)

(Heating)

CMM

22.5 46

Air filter, Q’ty

Polypropylene net (washable) × 2

–

Shock & vibration absorber – Cushion rubber (for compressor) Electric heater –– Operation control

Operation switch

Wireless-Remote control –

Room temperature control Microcomputer thermostat – Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), ECONO (Orange)

Safety equipment

O.D mm (in) Liquid line: φ6.35 (1/4″) Gas line: φ15.88 (5/8″) Connecting method Flare connecting Attached length of piping Liquid line: 0.70m

Gas line : 0.63m

–

Insulation Necessary (Both sides) Drain hose Connectable Power source supply Terminal block (Screw fixing type)

Size × Core number 1.5 mm2 × 4 cores (Including earth cable)

Connection wiring

Connecting method Terminal block (Screw fixing type)

Accessories (included)

Mounting kit, Clean filter (Allergen clear filter × 1, Photocatalytic washable deodorizing filter × 1)

Optional parts Wired-Remote control

Notes (1) The data are measured at the following conditions.

Model SRK71ZE-S1 (Indoor unit)

SRC71ZE-S1 (Outdoor unit)

Item Indoor air temperature Outdoor air temperature

Standards

Operation DB WB DB WB

Cooling 27ºC 19ºC 35ºC 24ºC ISO-T1, JIS C9612

Heating 20ºC – 7ºC 6ºC ISO-T1, JIS C9612

(2) The operation data are applied to the 220/230/240V districts respectively.

(3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.

(Purging is not required even for the short piping.)

If the piping length is longer, when it is 15 to 30 m, add 25g refrigerant per meter.

Operation data

(1)(2)

Refrigerant

piping

The piping length is 7.5m.

(220/230/240V)

(2) Range of usage & limitations

(3) Exterior dimensions

(a) Indoor unit

Models SRK63ZE-S1, 71ZE-S1

Indoor return air temperature (Upper, lower limits)

Refrigerant line (one way) length Max. 30m

SRK63ZE-S1, 71ZE-S1

Cooling operation: Approximately 18 to 32°C Heating operation: Approximately 15 to 30°C

Cooling operation: Approximately -15 to 46°C Heating operation: Approximately -15 to 21°C

Power source voltage Rating ± 10%

Voltage at starting Min. 85% of rating

Frequency of ON-OFF cycle Max. 7 times/h (Inching prevention 5 minutes)

ON and OFF interval Max. 3 minutes

Outdoor air temperature (Upper, lower limits)

Vertical height difference between outdoor unit and indoor unit

Max. 20m (Outdoor unit is higher) Max. 20m (Outdoor unit is lower)

Item

Models

VIEW A

17.360

150

43.5

489

Piping hole right (left)

248

19 51.2

Terminal block

1090

Unit: mm

318

44.5

7.7

299

106

8.5301.8

Installation board

450

Piping for Gas (ø15.88) 633.5

44.5

53.5

106

49.5

349

886

221.547

Indoor unit

1098

Piping for Liquid (ø6.35) 703.5

Drain hose 772 (ø16)

Piping hole (ø65)

(b) Outdoor unit

Models SRC63ZE-S1, 71ZE-S1

(4) Piping system

Models SRK63ZE-S1, 71ZE-S1

Unit: mm

Terminal block

Service valve (Gas) Flare fitting ø15.88 (5/8")

Service valve (Liquid) Flare fitting ø6.35 (1/4")

25.1165.5

30˚

48.5103.3

750

24.1

Drain holes

2-ø15

25.8

29.8

87.9880

150580150

532

223

340

61 47.5

19 380 19

418

Outdoor unitIndoor unit

Heat exchanger

Room temp. sensor

Humidity sensor

Heat exchanger

Flare connecting

Heat exchanger sensor

Piping (Liquid) ø6.35

Piping (Gas) ø15.88

Check joint

4 way valve

Service valve (Liquid)

Flare connecting

Discharge pipe temp. sensor

Cooling cycle

Heating cycle

Outdoor air temp. sensor

Heat exchanger sensor

Compressor

uffler

Capillary tube

Strainer Strainer

accumulator

Accumulator

Sub

Service valve (Gas)

Electronic expansion valve

(5) Selection chart

Correct the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity can be

obtained in the following way.

Net capacity = Capacity shown on specification ✕ Correction factors as follows.

(a) Coefficient of cooling and heating capacity in relation to temperatures

(b) Correction of cooling and heating capacity in relation to one way length of refrigerant piping

It is necessary to correct the cooling and heating capacity in relation to the one way piping length between the indoor and outdoor units.

In additions to the foregoing corrections (a), (b) the heating capacity needs to be adjusted also with respect to the frosting on the outdoor heat exchanger.

How to obtain the cooling and heating capacity

Example : The net cooling capacity of the model SRK63ZE-S1 with the piping length of 15m, indoor wet-bulb temperature at 19.0˚C

and outdoor dry-bulb temperature 35˚C is Net cooling capacity = 6300 ✕ 0.975 ✕ 1.0 = 6143W

SRK63ZE-S1 Length 15m

Factor by air temperatures

Cooling

Heating

2220181614

0.6

0.7

0.8

0.9

1.0

1.2

1.1

1.3

-5

-10

-15

Applicable range

Depends on installed situation

Outdoor air W.B. temperature ˚C W.B.

-15 -10 -5 0 5 10 15

Indoor air W.B. temperature ˚C W.B.

ISO-T1 Standard Condition

Cooling operation

Outdoor air D.B.

temperature

˚CD. B.

Coefficient of cooling &

Heating capacity in

relation to temperature

Heating operation

Indoor air D.B.

temperature

˚CD. B.

ISO-T1 Standard Condition

Piping length [m]

Cooling

Heating

1.0

0.99

1.0

0.975

1.0

0.965

1.0

0.95

1.0

0.935

1.0

Air inlet temperature of

outdoor unit in ˚C WB

Adjustment coefficient

-10

0.95-90.94-70.93-50.91-30.88-10.8610.8730.9251.00

ー77

ー

＊

1.2.3 ELECTRICAL DATA

(1) Electrical wiring

Models SRK63ZE-S1, 71ZE-S1

Heat

Y/GN

R-AMP

Wireless

Display

Y/GN

Indoor unit

Outdoor unit

2/N

1WH3

2/N

Y/GN

R/L

S/N

WHRDBK

exchanger

ZNR

250V

3.15A

Terminal block

TB TB

To wired

remote

control

(option)

BK WH RD

DC-P

DC-N

AF-L2

AF-L1

AC.L

AC.N

Power

transistor

250V

AC.N

AC.L

UVW

WH BK

N2 P2

IC2

DS1

P_1

N_1

Switching

power circuit

P_1

N_1

20A

WH Y/G

N-1G3

L-1

Power Source

1 Phase

220-240V 50Hz

Y/G

250V2AF

250V 2A

250V

20A

BKBLOR

Y/G

WHRDGR

Color symbol

Black

Blue

Orange

Yellow/Green

White

Red

Green

Yellow

Meaning of marks

Symbol

Parts name Symbol

Parts name

CMFFMIFMOSM

1,2

Th1Th

Compressor motor

Fuse

Fan motor(Indoor)

Fan motor(Outdoor)

Flap motor

Louver motor

Room temp.sensor

Heat exch.sensor(Indoor unit)

Th3Th4Th5Th6ZNR

20S

EEV

Humidity sensor

Heat exch.sensor(Outdoor unit)

Outdoor air temp.sensor

Discharge pipe temp.sensor

Varistor

4 way valve(coil)

Electronic expansion valve

Diode stack

LRLXR1

XR2

XR3

XR4

XR5

Inductor

Inspection lamp

Operation indication (DC12)

Heating indication (DC12)

ON indication for CM(DC12)

Check indication (DC12)

Distant operation

board

PWB1

PWB2

PWB3

Printed circuit

CNE

CNF

CNU

CNM

CNX

CNY

CNT

JEM-A

Option

CNB

XR1

XR2

XR3

XR4

XR5

CNT

CNG

CNH

CNG

CNH

CNG

CND

CNB

CNJ

CNO

CNI

CNG

LM1

LM2

FMo

20S

EEV

Th4

Th5

Th6

Th3Th2Th1

S Indication section

(a) Wireless remote control

1.2.4

OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

(1) Operation control function by remote control switch

FAN SPEED button

Each time the button is pushed, the indicator is switched over in turn.

• The above illustration shows all controls, but in practice

only the relevant parts are shown.

OPERATION MODE select button

Each time the button is pushed, the indicator is switched over in turn.

ALLERGEN button

This button selects ALLERGEN CLEAR operation.

ON/OFF (luminous) button

Press for starting operation, press again for stopping.

HI POWER/ECONO button

This button changes the HIGH POWER/ ECONOMY mode.

AIR FLOW (UP/DOWN) button

This button changes the flow (up/down) mode.

RESET switch

Switch for resetting microcomputer.

SLEEP button

This button changes to SLEEP operation.

CLEAN switch

This switch changes the CLEAN mode.

ON TIMER button

This button selects ON TIMER operation.

AIR FLOW (LEFT/RIGHT) button

This button changes the air flow (left/right) mode.

CANCEL button

This button cancels the ON timer,OFF timer, and SLEEP operation.

OFF TIMER button

This button selects OFF TIMER operation.

OPERATION MODE indicator

Indicates selected operation with lamp. [

(Auto) • (Cool) • (Heat) • (Dry) •

(Fan) ]

TEMPERATURE indicator

Indicates set temperature. (Does not indicate temperature when operation

mode is on AUTO)

FAN SPEED indicator

Indicates set air flow rate with lamp.

ALLERGEN CLEAR indicator

Indicates during ALLERGEN CLEAR operation.

SLEEP indicator

Indicates during SLEEP operation.

ON/OFF TIMER indicator

Indicates during ON/OFF TIMER operation.

CLEAN indicator

Indicates during CLEAN operation.

TIME indicator

Indicates present time or timer setting time.

AIR FLOW indicator

Shows selected flap and louver mode.

Models All models

S Operation section

TEMPERATURE button

This button sets the room temperature. (This button changes the present time and

TIMER time.)

TIME SET UP switch

Switch for setting the time.

HI POWER/ECONO MODE indicator

Indicates during HIGH POWER/ECONOMY mode operation.

(b) Wired remote control (Optional parts)

The figure below shows the remote control with the cover opened. Note that all the items that may be displayed in the liquid crystal display

area are shown in the figure for the sake of explanation.

Characters displayed with dots in the liquid crystal display area are abbreviated.

Pull the cover downward to open it.

Weekly timer display

Displays the settings of the weekly timer.

[Vent Indicator]

Indicates operation in the Ventilation mode.

Operation/Stop switch

This switch is used to operate and stop the air conditioning system. Press the switch once to operate the system and press it once again to stop the system.

MODE switch

This switch is used to switch between operation modes. (The clean operation or allergen clear operation cannot be selected.)

Operation setting display area

Displays setting temperature, airflow volume, operation mode and operation message.

Operation/Check indicator light

During operation: Lit in green In case of error: Flashing in red

FAN SPEED switch

This switch is used to set the airflow volume. (AUTO, ULO, HI POWER or ECONO cannot be selected.)

SET switch

This switch is used to apply the timer operation setting. This switch is also used to make silent mode operation settings.

[RESET switch]

Press this switch while making settings to go back to the previous operation. This switch is also used to reset the

FILTER CLEANING message display.

(Press this switch after cleaning the air filter.)

Central control display

Displayed when the air conditioning system is controlled by the option controller.

Timer operation display

Displays the settings related to timer operation.

AIR CON No. (Air conditioning system No.) switch

Displays the number of the connected air conditioning system. ("00" appears.)

[CHECK switch]

This switch is used at servicing.

[TEST switch]

This switch is used during test operation.

Temperature setting switches

These switches are used to set

the temperature of the room.

VENT switch

Switch that operates the connected ventilator.

Timer setting switches

These switches are used to set the timer mode and time.

TIMER switch

This switch is used to select a timer mode. (The comfortable timer or sleep operation cannot be selected.)

[GRILL switch]

This switch has no function. When this switch is pressed, (Invalid Operation) is displayed, but it does not mean a failure.

LOUVER switch

This switch is used to operate/stop the swing louver. (Up/down swing only)

* If you oress any of the switches above and INVALID OPER is display, the switch has no function. But it does not mean a failure.

Note (1) The SRK models don't support the switches and functions displayed in [ ].

(2) Unit ON/OFF button

When the remote control batteries become weak, or if the remote control is lost or malfunctioning, this button may be used to turn the

unit on and off.

(a) Operation

Push the button once to place the unit in the automatic mode. Push it once more to turn the unit off.

(b) Details of operation

The unit will go into the automatic mode in which it automatically determines, from room temperature (as detected by sensor),

whether to go into the cooling, thermal dry or heating modes.

Function

Room temperature

Operation mode

setting

Fan speed Flap

Timer switch

Cooling About 24ºC

Thermal dry About 24ºC Auto Auto Continuous

Heating About 26ºC

ECONO light (orange)

Illuminates during ECONOMY operation.

TIMER light (yellow)

Illuminates during TIMER operation.

HI POWER light (green)

Illuminates during HIGH POWER operation.

RUN (HOT KEEP) light (green)

• Illuminates during operation.

• Brinks at air flow stop due to the ‘HOT KEEP’.

(3) Power blackout auto restart function

(a) Power blackout auto restart function is a function that records the operational status of the air-conditioner immediately prior to it

being switched off by a power cut, and then automatically resumes operations at that point after the power has been restored.

(b) The following settings will be cancelled:

(i) Timer settings

(ii) High-power operations

Notes (1) The power blackout auto restart function is set at on when the air-conditioner is shipped from the

factory. Consult with your dealer if this function needs to be switched off.

(2) When power failure ocurrs, the timer setting is cancelled. Once power is resumed, reset the timer.

(3)

If the jumper wire (J7) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram at right)

Unit ON/OFF button

Models All models

Jumper wire (J7)

EXTERNAL INPUT

WIRED REMOCON

OPE PERMISSION CUSTOM

AUTO RESTART

LO TEMP

DIRT PREVENT

COOL ONLY

HI CEIL PANEL

50/60

EXTERNAL INPUT

WIRED REMOCON

OPE PERMISSION CUSTOM

AUTO RESTART

LO TEMP

DIRT PREVENT

COOL ONLY

HI CEIL PANEL

50/60

(4) Custom cord switching procedure

If two wireless remote controls are installed in one room, in order to prevent wrong

operation due to mixed signals, please modify the printed circuit board in the indoor

unit’s control box and the remote control using the following procedure. Be sure to

modify both boards. If only one board is modified, receiving (and operation) cannot

be done.

(a) Modifying the indoor unit’s printed circuit board

Take out the printed circuit board from the control box and cut off jumper wire (J4)

using wire cutters.

After cutting of the jumper wire, take measures to prevent contact with the other the lead wires, etc.

(b) Modifying the wireless remote control

1) Remove the battery.

2) Cut the jumper wire shown in the figure at right.

Cut

(5) Flap and louver control

Control the flap and louver by AIRFLOW

 

(UP/DOWN) and



(LEFT/RIGHT) button on the wireless remote control.

(a) (i) Swing flap

Flap moves in upward and downward directions continuously.

(ii) Swing louver

Louver moves in left and right directions continuously.

(iii) When not operating

The flap returns to the position of air flow directly below, when operation has stopped.

(b) Multi-directional Air Flow (up/down air and left/right air scroll)

Activating both up/down air swing and left/right air swing at the same time results in a multi-directional air flow.

Up/down air scroll

Stops at this position for 5 seconds.

In COOL, DRY and FAN operation

When you press the AIRFLOW (UP/DOWN or LEFT/RIGHT) button once while the flap or louver is operating, it stops swinging

at an angle. Since this angle is memorized in the microcomputer, the flap or louver will automatically be set at this angle when the

next operation is started.

¡ Recommendable stopping angle of the flap

Horizontal blowing

COOL•DRY

Slant forward blowing

HEAT

Left/right air scroll

In COOL, DRY and FAN operationIn HEAT operation

Stops at this position for 5 seconds.

In HEAT operation

Left louver Right louver

Thick line : moves quickly Thin line : moves slowly

Jumper wire (J4)

Corrects the starting time of next operation by calculating the temperature difference.

(Example) Heating

Setting temperature

Room temperature

Operation starting time

Time

Setting time

15 min. 10 min. 5 min. earlier earlier earlier

¡ If the difference (= Setting temperature – Room tempera-

ture) is 4ºC, the correction value is found to be +5 minutes from the table shown above so that the starting time of next operation is determined as follows:

15 min. earlier + 5 min. = 20 min. earlier

↑↑

Current operation Correction value start time

(6) Comfortable timer setting

If the timer is set at ON when the operation select switch is set at the cooling or heating, or the cooling or heating in auto mode operation

is selected, the comfortable timer starts and determines the starting time of next operation based on the initial value of 15 minutes and the

relationship between the room temperature at the setting time (temperature of room temperature sensor) and the setting temperature.

(Max. 60 minutes)

Operation mode Operation start time correction value (Min.)

3 < Room temp. – Setting temp. 1 < Room temp. – Setting temp. 3 Room temp. – Setting temp. 1

At cooling

+5 No change –5

3 < Setting temp. – Room temp. 2 < Setting temp. – Room temp. 3 Setting temp. – Room temp. 2

At heating

+5 No change –5

Notes (1) At 5 minutes before the timer ON time, operation starts regardless of the temperature of the room temperature sensor (Th1).

(2) This function does not operate when in the Dry or Auto Dry and FAN mode.

However, the operation in item (1) does operate in the Auto Dry and FAN mode.

(3) During the comfortable timer operation, both the RUN light and TIMER light illuminate and the TIMER light goes off after expiration of the timer, ON setting

time.

Timer operation (time)

Start

Timer operation (time)

Temperature setting (˚C)

Start

Temperature setting (˚C)

Heating

Cooling, DRY

(7) Sleep timer operation

Pressing the SLEEP button causes the temperature to be controlled as shown in the following chart with respect to the set temperature.

1.0

-1.0

0 1.0 2.0

-1.0

-2.0

-3.0

-6.0

0 0.5 1.0 2.0

(i) Fuzzy operation

(ii) Heating thermostat operation

¡ Operating conditions

If the inverter command speed obtained with the fuzzy calculation drops below -24 rps during the heating fuzzy operation, the operation changes to the heating thermostat operation.

¡ Detail of operation

Model

SRK63ZE-S1, 71ZE-S1

Item

Inverter command speed 0rps [Comp. stopped] Indoor fan motor Hot keep N or M mode → 1st speed

Outdoor fan motor Stop

Flap and louver Horizontal, center

(8) Outline of heating operation

(a) Operation of major functional components in heating mode

(b) Air flow selection

(i) Speed of inverter changes within the range of selected air flow.

Model

SRK63ZE-S1 SRK71ZE-S1

Air flow selection

Inverter command speed 12~88rps 12~95rps

Air flow Depends on inverter command speed.

Inverter command speed 12~88rps 12~95rps

Air flow 9th speed fixed

Inverter command speed 12~88rps 12~95rps

Air flow 7th speed fixed

Inverter command speed 12~74rps 12~80rps

Air flow 5th speed fixed

ULO

Inverter command speed 12~40rps

Air flow 3rd speed fixed

Auto

MED

Item

Indoor fan motor ON ON OFF

Flap and louver ON or OFF ON or OFF Stop position control

Display Lights up Lights up Lights up or flashes

Outdoor fan motor ON

4-way valve Depending on the stop mode ON Depending on the stop mode

Electronic expansion valve Depending on the EEV control

When the inverter

speed is 0rps

When the inverter speed

is other than 0rps

When the inverter speed is 0rps

due to an anomalous stop

Functional components

(ii) When the defrosting, protection device, etc. is actuated, operation is performed in the corresponding mode. (iii) Outdoor unit blower operates in accordance with the inverter command speed.

(iii) Hot keep operation

Note (1) Refer to the table shown above right for the values A and B.

¡ Hot keep N mode (Air flow: HI, MED, LO, ULO)

Indoor heat exchanger temp. (˚C)

¡ Values of A, B

At 0 rps command 22 25

Other than 0 rps

10 15

command

Notes (1) Refer to the table shown above right for the values A and B.

¡ Hot keep M mode (Air flow: AUTO, HIGH POWER, ECONOMY)

Indoor heat exchanger temp. (˚C)

¡ Values of A, B

At 0 rps command 22 25

Other than 0 rps

10 15

command

OFF

Indoor fan speed

A B

26 27 28 29.5 31.5 33 35.5 38 40.5 43 45.5 48

OFF

Indoor fan speed

A B

26 27 28 29.5 31.5 33 34.5 36 37.5 39 40.5 42

(d) Defrosting operation

(i) Starting conditions (Defrosting operation can be started only when all of the following conditions are met.)

1) 1 After start of heating operation → When it elapsed 45 minutes.(Accumulated compressor operation time)

2 After end of defrosting operation → When it elapsed 45 minutes.(Accumulated compressor operation time) 3 Outdoor unit heat exchanger sensor (Th4) temperature → When the temperature has been below –5ºC for 3

minutes continuously.

4 ¡ The outdoor air temperature

–17°C

The difference between the outdoor air temperature sensor temperature and the outdoor heat exchanger temperature sensor temperature is

7ºC.

¡ The outdoor air temperature < –17°C

The difference between the outdoor air temperature sensor temperature and the outdoor heat exchanger temperature sensor temperature is

–5ºC.

5 During continuous compressor operation (Defrost operations shall not be performed from 10 minutes after the

compressor begins running.)

2) In addition, when the inverter command speed from the indoor controller of the indoor unit during heating opera-

tion has counted 0 rps 10 times or more and all conditions of 1, 2, 3 and 5 above and when the outdoor air temperature is 3°C or less are satisfied (note that when the temperature for Th4 is -5°C or less: 30 rps or more, -4°C or less: less than 30 rps), After running at an inverter command speed of 40rps for 7 minutes, defrost operations will start.

3) 1 After start of heating operation → Less than 45 minutes.(Accumulated compressor operation time)

2 After end of defrosting operation → Less than 45 minutes.(Accumulated compressor operation time) 3 Outdoor unit heat exchanger sensor (Th4) temperature → When the temperature has been below –5ºC for 3

minutes continuously.

4 ¡ The outdoor air temperature

–17°C

The difference between the outdoor air temperature sensor temperature and the outdoor heat exchanger temperature sensor temperature is

20ºC.

¡ The outdoor air temperature < –17°C

The difference between the outdoor air temperature sensor temperature and the outdoor heat exchanger temperature sensor temperature is

15ºC.

5 During continuous compressor operation (Defrost operations shall not be performed from 10 minutes after the

compressor begins running.)

Note (1) When outdoor unit heat exchanger sensor (Th4) temperature becomes 2°C or higher, inverter command changes 70 rps to 40

rps.

(iii) Ending conditions (Operation returns to the heating cycle when either one of the following is met.)

1 Outdoor heat exchanger sensor (Th4) temperature: 15ºC or higher 2 Continued operation time of defrosting → For more than 10 min.

(e) Heating “HIGH POWER” operation (HI POWER button on remote controller: ON)

Operation is maintained for 15 minutes with a higher blow out air temperature.

¡ Detail of operation

Model

SRK63ZE-S1 SRK71ZE-S1

Item

Inverter command speed 88 rps 95 rps

Indoor fan motor Hot keep M mode (max 10th speed)

Outdoor fan motor 6th speed

Notes (1) Room temperature is not adjusted during the HIGH POWER operation.

(2) Protective functions will actuate with priority even during the HIGH POWER operation.

indoor unit

Hot keep

120sec.120sec.

40sec. 40sec.

Final defrost operation

Defrost operation

(1)

Defrost end (Th4 15°C ,10 min.)

Hot keep

outdoor unit

Indoor fan

motor

Outdoor fan

motor

4-way valve

RUN light

Inverter

command

OFF

Corresponding

to speed

OFF

Corresponding

to speed

Defrost operation

preparation

Normal heating operation restored

Flashing

(Hot keep)

Fuzzy calculated

value

70rps

(ii) Operation of functional components during defrosting operation

Model

SRK63ZE-S1 SRK71ZE-S1

Item

Inverter command speed 64 rps 74 rps

Indoor fan motor 8th speed

Outdoor fan motor 6th speed

(9) Outline of cooling operation

(a) Operation of major functional components in Cooling mode

Item

Indoor fan ON ON OFF

Flap and louver ON or OFF ON or OFF Stop position control

Display Lights up Lights up Lights up or flashes

Outdoor fan motor ON

4-way valve Depending on the stop mode OFF Depending on the stop mode

Electronic expansion valve Depending on the EEV control

When the inverter

speed is 0rps

When the inverter speed

is other than 0rps

When the inverter speed is 0rps

due to an anomalous stop

Functional components

(i) Fuzzy operation

During the fuzzy operation, the air flow and the inverter command speed are controlled by calculating the difference between

the room temperature setting correction temperature and the suction air temperature.

(ii) Cooling thermostat operation

1) Operating conditions

During the cooling fuzzy operation or when the inverter command speed obtained by the fuzzy calculation is less than

-24 rps.

2) Detail of operation

(b) Air flow selection

(i) Speed of inverter changes within the range of selected air flow.

(ii) When any protective function actuates, the operation is performed in the mode corresponding to the function.

(iii) Outdoor blower is operated in accordance with the inverter command speed.

(iii) Cooling “HIGH POWER” operation (HI POWER button on remote control: ON)

The unit is operated continuously for 15 minutes regardless of the setting temperature.

1) Detail of operation

Model

SRK63, 71ZE-S1

Item

Inverter command speed 0 rps [Comp. stopped]

Indoor fan motor Corresponds to fan speed switch.

Outdoor fan motor Stop

Notes (1) Protective functions will actuate with priority even during the “HIGH POWER” operation.

(2) Room temperature is not adjusted during the “HIGH POWER” operation

Model

SRK63ZE-S1 SRK71ZE-S1

Air flow selection

Inverter command speed 12~64rps 12~74rps

Air flow Depends on inverter command speed.

Inverter command speed 12~64rps 12~74rps

Air flow 8th speed fixed

Inverter command speed 12~54rps 12~62rps

Air flow 6th speed fixed

Inverter command speed 12~40rps 12~44rps

Air flow 4th speed fixed

Inverter command speed 12~30rps

Air flow 2nd speed fixed

Auto

MED

ULO

(10) Outline of dehumidifying operation

(a) After operating the indoor blower for 20 seconds from immediately after the start of operation, the indoor temperature is checked

and, based on the result of check, the cooling oriented dehumidifying or heating oriented dehumidifying is selected.

Heating oriented dehumidifying Cooling oriented dehumidifying

Low –3 High

Room temperature - Setting temperature (deg)

Cooling or heating oriented dehumidifying is selected again one hour after the first selection of the cooling or heating oriented

dehumidifying.

Operation range

(b) Outline of control

(i) Cooling oriented dehumidifying

Room temperature and relative humidity is checked at 5-minute intervals after selecting the cooling or heating oriented

dehumidifying in order to determine the operation range.

Low –1 0 +2 High

Room temperature – Setting temperature (deg)

High humidity regions

I (I)

F (F) E (F) D (E)

Low humidity regions C (C) B (C) A (B)

Note (1) Figures in the parentheses

( ) show the values at ECONOMY operation.

• Humidity sensor’s set values

55 70

Relative humidity (%)

High humidity regions

Low humidity regions

Determination of cooling oriented dehumidifying operation range

Operation pattern

Inverter command speed

(rps)

Indoor fan motor

Outdoor fan motor

4th speed

5min.

2nd speed

3rd speed

5min.

2nd speed

3rd speed

5min.

3rd speed

4th speed

5min.

2nd speed

3rd speed

5min.

25sec.

5min.

4th speed

5th speed

1st speed

OFF

5min.

Temperature and humidity check

A range B range C range D range E range F range I range

(ii) Heating oriented dehumidifying

After interrupting the compressor operation for 3 minutes (by the 3-minute timer) following the determination of heating

oriented dehumidifying, the unit begins in the heating operation. If the room temperature exceeds the setting temperature by

2ºC or more, the unit checks the room temperature at 5-minute intervals and, depending on the result, determines the range

of heating oriented dehumidifying operation within the (M) range.

OLM

Low –1 0 High

Room temperature – Setting temperature (deg)

Operation range

Heating operation O range L range M range

4th speed

2nd speed 2nd speed

3rd speed 3rd speed

25 sec.

OFF

1st speed

Inverter command speed

(rps)

Indoor fan motor

Outdoor fan motor

Determination of heating oriented dehumidifying operation range

Temperature check

5 min. 5 min. 5 min.

Depends on the operation condition

Operation pattern

Note (1) Figures in the parentheses

( ) show the values at ECONOMY operation.

(O) (L) (L)

(11) Outline of automatic operation

(a) Determination of operation mode

The unit checks the room temperature and the outdoor air temperature after operating the indoor and outdoor blowers for 20

seconds, determines the operation mode and the room temperature setting correction value, and then begins in the automatic

operation.

Heating

Dehumidifying

Cooling

Room temperature (˚C)

Outdoor temperature (˚C)

27.5

25.5

19.5

(b) The unit checks the temperature every hour after the start of operation and, if the result of check is not same as the previous

operation mode, changes the operation mode.

(c) When the unit is started again within one hour after the stop of automatic operation or when the automatic operation is selected

during heating, cooling or dehumidifying operation, the unit is operated in the previous operation mode.

(d) Setting temperature can be adjusted within the following range. There is the relationship as shown below between the signals of

the wireless remote control and the setting temperature.

Signals of wireless remote control (Display)

–6 –5 –4 –3 –2 –1 ±0+1+2+3+4+5+6

Setting

Cooling 18 19 20 21 22 23 24 25 26 27 28 29 30

temperature

Dehumidifying 18 19 20 21 22 23 24 25 26 27 28 29 30

Heating 20 21 22 23 24 25 26 27 28 29 30 31 32

(12) Outline of fan operation

(a) Operation of major functional components

(13) Outline of clean operation

COOL, DRY, AUTO (COOL, DRY); after operation has stopped, the moisture inside the dryer air conditioner, controls the production

of fungus etc.

(a) Operating condition

‘Clean’ is switched ON, when the air conditioner receives a STOP signal.

(b) Detail of operation

When control finishes 120 minutes after the Clean operation starts. When the stop signal is received from the remote control.

(14) Outline of allergen clear operation

(a) The start fan operation, and decision to the operation pattern.

Indoor fan speed at 2nd speed, outdoor fan speed at 4th speed for 6 minutes, measure room temperature and outdoor temperature,

decide to use operation Pattern 1 or operation Pattern 2 according to the conditions in the following diagram.

(b) Operation flow

Inverter command speed

Indoor fan motor

Outdoor fan motor

Flap and louver

2nd speed 8th speed

0rps

OFF

Depend on the flap and louver control

6th speed 4th speed 2nd speed2nd speed

AUTO HI MED LO ULO ECONO

Functional components

Fan speed switching

Inverter command speed 0 rps

Indoor fan motor 1st speed

Outdoor fan motor OFF

Flap and louver Fully closed

Operation pattern2

Operation pattern1

Outdoor temperature (°C)

Room temperature (

Inverter command speed 0

Indoor fan motor 2nd speed

Outdoor fan motor 4th speed

Flap and louver Horizontal, center

After cooling operation, if (outdoor temperature-indoor temperature)

> =

9°C or

humidity sensor measures humidity

> =

70%

Fan operation 2 (42 min.)

After cooling operation, if (outdoor temperature-indoor temperature) < 9°C and humidity sensor measures humidity < 70% Heating cycle operation (42 min.)

Operation pattern2

Start

Allergen clear operations control (90 minutes)

End

Cooling

operation

(18 min.)

Standby

operation

(6 min.)

Complete stop Complete stop

Operation pattern1

Fan operation

(18 min.)

Fan operation1

(84 min.)

Start fan operation

(6 min.)

When the compressor is operating

When the compressor is stopped

(Including protection stoppage)

Inverter command speed 20 rps 0 rps

Indoor fan motor OFF

Outdoor fan motor 3rd speed Determined by heating stop mode

Flap and louver Horizontal/ Center

4-way valve ON Determined by heating stop mode

(i) Fan operation1

1) Operation content

Inverter command speed 0 rps

Indoor fan motor 1st speed

Outdoor fan motor OFF

Flap and louver Fully closed/ Center

(ii) Cooling operation

1) Operation content

Inverter command speed 20 rps

Indoor fan motor 2nd speed

Outdor fan motor 3rd speed

Flap and louver Horizoc/Center

4-way valve OFF

Note (1) During cooling operation safety control,frost

prevention control, and cooling overload protective control are generally not applicable

(iii) Heating cycle operation

1) Operation content

T1 T2

42min.

TimeStop

Compressor operation

2) Operation time

After cooling operation

(outdoor temperature–indoor

temperature)

1 (Compressor operation time)

T2 (Compressor stopped time)

Heating operation control time (T1+T2)

–12°C~–10°C

2440

–12°C

2430

–10°C~–8°C

2450

–8°C~–6°C

2460

–6°C~–4°C

2470

42min.

–4°C~–2°C

2480

–2°C~0°C

2490

0°C~4°C

2500

4°C~9°C

2510

(Sec.)

(iv) Fan operation2 (v) Standby operation

1) Operation content 1) Operation content

Inverter command speed 0 rps

Indoor fan motor OFF

Outdoor fan motor 2nd speed

Flap and louver Fully closed/ Center

(15) ECONOMY operation (ECONO button on remote control: ON)

(a) The set temperature is raised by 1.5ºC (0.5ºC every one hour) at cooling operation and lowered by 2.5ºC (Steps of 1ºC, 1ºC and

0.5ºC every one hour) at heating operation to continue the operation with the following contents.

(b) Detail of operation

CnT Input

A Unit

B Unit

OFF

*ON

OFF

Note (1) The ON with the * mark indicates an

ON operation using the remote control

unit switch, etc.

(ii) When Jumper wire J1 on the PCB of indoor unit is cut at the field or “PULSE INPUT” is selected in the wired remote

control’s indoor unit settings. Input signal to CnT becomes valid at OFF → ON only and the motion of air conditioner [ON/OFF] is inverted.

CnT Input

A Unit

B Unit

OFF

*ON

(16) External control (remote display)/control of input signal

Make sure to connect the wired remote control unit. Control of input signal is not available without the wired remote control unit.

(a) External control (remote display) output

Following output connectors (CNT) are provided on the printed circuit board of indoor unit.

(i) Operation output: Power to engage DC 12V relay (provided by the customer) is outputted during operation.

(ii) Heating output: Power to engage DC 12V relay (provided by the customer) is outputted during the heating operation.

(iii) Compressor ON output: Power to engage DC 12V relay (provided by the customer) is outputted while the compressor is

operating.

(iv) Error output: When any error occurs, the power to engage DC 12V relay (provided by the customer) is outputted.

(b) Control of input signal

Control of input signal (switch input, timer input) connectors (CNT) are provided on the control circuit board of the indoor unit.

However, when the operation of air conditioner is under the Center Mode, the remote control by CnT is invalid.

(i) If the factory settings (Jumper wire J1 EXTERNAL INPUT on the PCB) are set, or “LEVEL INPUT” is selected in the wired

remote control’s indoor unit settings.

1) Input signal to CnT OFF → ON Air conditioner ON

2) Input signal to CnT ON → OFF Air conditioner OFF

Model

SRK63ZE-S1 SRK71ZE-S1

Item

Operation mode Cooling Heating Cooling Heating

Inverter command speed 12~46 rps 12~60 rps 12~52 rps 12~66 rps

Indoor fan motor 2nd, 4th speed 3rd, 5th speed 2nd, 4th speed 3rd, 5th speed

Outdoor fan motor 3rd~5th speed

Inverter command speed 0 rps

Indoor fan motor OFF

Outdoor fan motor

Determined by stop mode

Flap and louver Fully closed/ Center

(17) Operation permission/prohibition control

The air conditioner operation is controlled by releasing the jumper wire (J3) on the indoor control board and inputting the

external signal into the CnT.

(a) The operation mode is switched over between Permission and Prohibition by releasing the jumper wire (J3) on

the indoor control board.

(b) When the CnT input is set to ON (Operation permission)

(i) The air conditioner can be operated or stopped by the signal from the remote control signal line.

(When the "CENTER" mode is set, the operation can be controlled only by the center input.)

(ii) When the CnT input is changed from OFF to ON, the air conditioner operation mode is changed depending on the status of

the jumper wire (J1) on the indoor control board.

(i) The air conditioner cannot be operated or stopped by the signal from the remote control signal line.

(ii) The air conditioner operation is stopped when the CnT input is changed from ON to OFF.

(d) When the operation permission / prohibition mode is set to effective by the indoor function setting selected by

the remote control, the operation depends on (a) above.

When the jumper wire (J3) is short circuited

Normal operation is enable (when shipping)

When CnT input is set to ON, the operation starts and

if the input is set to OFF, the operation stops.

For the CnT and remote control inputs, the input which

is activated later has priority and can start and stop the

operation.

When the jumper wire (J3) is released

Permission / Prohibition mode

When Cnt input is set to ON, the operation mode is

changed to permission and if input is set to OFF the

operation is prohibited.

When the jumper wire (J1) is short circuited

The signal (i) above starts the air conditioner.

(Shipping status)

When the jumper wire (J1) is released

When the CnT input is set to ON, the air conditioner

starts operation. After that, the operation of the air

conditioner depends on (i) above. (Local status)

(18) Protective control function

(a) Indoor fan motor protection

When the air conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 300 rpm or

under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system.

TIMER light illuminates simultaneously and the RUN light flashing 6 times at each 8-second.

(b) Dew condensation prevention control [Cooling (including automatic), cooling oriented dehumidifying operation]

(i) Operating conditions: When all of the following conditions are met.

1 When the inverter command speed is higher than 20 rps, and the humidity sensor value is higher than 68% continuously

for more than 20 minutes.

2 Indoor heat exchanger temperature

Room temperature –12ºC.

(ii) Detail of operation:

1 Indoor heat exchanger temperature

Room temperature –12ºC

The inverter command speed is reduced 4rps at each 20 seconds. Lower limit speed is 20 rps.

2 Room temperature –12ºC <Indoor heat exchanger temperature

Room temperature –8ºC

The inverter command speed is maintained for 20 seconds.

3 When this control continues for more than 30 minutes, carry out air flow control.

a) Up/down air flow

When selecting other than Up/down swing or multi-directional air flow, compel flat orientation.

b) Left/right air flow

When selecting other than Left/right swing or multi-directional air flow, compel centralized orientation.

(iii) Reset conditions: When either of the following conditions is satisfied.

1 The humidity sensor value is less than 63%.

2 The inverter command speed is less than 20 rps.

3 Indoor heat exchanger temperature > Room temperature –8ºC.

The inverter command speed is raised by 1rps and kept at that speed for 20 seconds. This process is repeated until the

calculated speed is reached.

◆ < I >

(i) Operating conditions: After the inverter command speed is at a value other than 0 rps for ten minutes, when the indoor

heat exchanger temperature is less than 2.5°C.

(ii) Detail of operation

2) If the indoor heat exchanger temperature reaches more than 8°C, the inverter command speed shall be limited to 50rps

to restart operation.

(iii) Reset conditions: Indoor heat exchanger temperature reaches more than 8°C, inverter command speed is at a value other

than 0rps for 10 minutes.

Inverter command speed 0rps

Indoor fan motor Depends on inverter command speed

Outdoor fan motor OFF

4-way valve OFF

◆ < II >

(i) Operating conditions: When all of the following conditions are met.

1 After the inverter command speed is at a value other than 0 rps for 8 minutes, when the indoor heat exchanger tempera-

ture is less than 5°C.

2 When the inverter command speed is more than 20 rps.

(ii) Detail of operation:

1 Indoor heat exchanger temperature

5ºC

The inverter command speed is reduced 4rps at each 20 seconds. Lower limit speed is 20 rps.

2 5ºC <Indoor heat exchanger temperature

8ºC

The inverter command speed is maintained for 20 seconds.

(iii) Reset conditions: When either of the following condition is satisfied.

1 The inverter command speed is less than 20rps.

2 The indoor heat exchanger temperature is more than 8ºC.

The inverter command speed is raised by 1rps and kept at that speed for 20 seconds. This process is repeated until the

calculated speed is reached.

(d) Cooling overload protective control

(i) Operating conditions: When the outdoor unit is operating with the outdoor unit speed of other than 0 rps, and when the

outdoor air temperature sensor (Th5) becomes 41ºC or over for 30 seconds continuously.

(ii) Detail of operation

1) Outdoor fan is stepped up by 3 speed step. (Upper limit speed is 7th speed.)

2) The lower limit of control speed is set to 30 rps and even if the calculated result becomes lower than that after fuzzy

calculation, the speed is kept to 30 rps. However, when the thermo becomes OFF, the speed is reduced to 0 rps.

(iii) Reset conditions: When either of the following condition is satisfied.

1 When the outdoor air temperature becomes 40ºC or less.

2 When the inverter command speed is 0rps.

(e) Cooling low outdoor temperature protective control

◆ < I >

(i) Operating conditions: When the outdoor air temperature sensor (Th5) is 22ºC or lower continues for 30 seconds while

outdoor speed is other than 0rps.

(ii) Detail of operation: After the outdoor fan operates at 3rd speed for 60 seconds; the corresponding outdoor heat

exchanger temperature shall implement the following controls.

1 Outdoor heat exchanger temperature

22ºC

After the outdoor fan speed drops (down) to one speed for 60 seconds; if the outdoor heat exchanger temperature is lower than 22°C, gradually reduce the outdoor fan speed by 1 speed. (Lower limit speed is 1st speed)

2 22ºC < Outdoor heat exchanger temperature

40ºC

After the outdoor fan speed maintains at 3rd speed for 20 seconds; if the outdoor heat exchanger temperature is 22°C~ 40°C, maintain outdoor fan speed.

3 Outdoor heat exchanger tempeature > 40ºC

After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is higher than 40°C, gradually increase outdoor fan speed by 1 speed. (Upper limit speed is 3rd speed)

(iii) Reset conditions: When the either of the following conditions is satisfied

1 When the outdoor air temperature sensor (Th5) becomes 25ºC or higher.

2 When the inverter command speed is 0rps.

◆ < II >

(i) Operating conditions: When the outdoor air temperature sensor (Th5) is 22ºC or lower continues for 30 seconds while

outdoor speed is other than 0rps.

(ii) Detail of operation:

1 The lower limit of inverter command speed is set to 20(30)rps and even if the speed becomes lower than 20(30)rps, the

speed is kept to 20(30)rps. However, when the thermo becomes OFF, the speed is reduced to 0rps.

2 The upper limit of control speed is set to 60(50)rps and even if the calculated result becomes higher than that after fuzzy

calculation, the speed is kept to 60(50)rps.

(iii) Reset conditions: When the either of the following condition is satisfied

1 When the outdoor air temperature sensor (Th5) becomes 25ºC or higher.

2 When the inverter command speed is 0rps.

(f) High pressure control

(i) Purpose: Prevents anomalous high pressure operation during heating. (ii) Detector: Indoor heat exchanger sensor (Th2) (iii) Detail of operation:

1 56ºC

Indoor heat exchanger temperature < 58°C

The inverter command speed is reduced 2rps at each 20 seconds. When the indoor unit heat exchanger temperature is 58°C or higher but less 61°C, the speed is reduced 4rps at each 20 seconds. The lower limit speed is 30rps. When the temperature is 61°C or higher for 1 minute continuously, the inverter is stopped.

2 48.5ºC

Indoor unit heat exchanger temperature < 56ºC

The inverter command speed is been maintained and the operation has continued for more than 20 seconds at the same

speed, it returns to the normal heating operation.

Note (1) Indoor fan retains the fan tap when it enters in the high pressure control. Outdoor fan is operated in accordance with the speed.

(iv) Reset conditions: When the indoor heat exchanger temperature is less than 48.5°C

The inverter command speed is raised by 1rps and kept at that speed for 20 seconds. This process is repeated until the

calculated speed is reached.

(g) Heating overload protective control

(i) Operating conditions : When the unit is operating with the outdoor unit speed other than 0 rps or when the outdoor air

temperature sensor (Th5) rose beyond 22ºC for 30 seconds continuously.

(ii) Detail of operation:

1 Taking the upper limit of control speed range at 50 rps, if the output speed obtained with the fuzzy calculation exceeds the

upper limit, the upper limit value is maintained.

2 The lower limit of control speed is set to 30 rps and even if the calculated result becomes lower than that after fuzzy

calculation, the speed is kept to 30 rps. However, when the thermo becomes OFF, the speed is reduced to 0 prs.

3 The outdoor fan is lowered forcibly by 1step. (Lower limit speed is 2nd speed.)

22 25

OFF

Upper limit 50rps Lower limit 30rps

Upper limit 60rps Lower limit 20rps

Outdoor air temp.(°C)

(h) Heating low outdoor temperature protective control

◆ < I > (i) Operating conditions: When the outdoor air temperature sensor (Th5) is 4°C or lower continues for 30 seconds while

outdoor speed is other than 0rps.

(ii) Detail of operation: When the inverter command speed is less than 20rps, the speed is forcibly set at 20rps. However,

when the thermo becomes OFF, the speed is reduced to 0rps.

(iii) Reset conditions: When the outdoor air temperature sensor (Th5) becomes 6°C or higher.

◆ < II > (i) Operating conditions: When the outdoor air temperature sensor (Th5) is 4°C or lower continues for 30 seconds while

outdoor speed is other than 0rps.

(ii) Detail of operation: Outdoor fan is stepped up by 2 speed step. (Upper limit 7th speed) (iii) Reset conditions: When the outdoor air temperature sensor (Th5) becomes 6°C or higher.

◆ < III >

(i) Operating conditions: When the outdoor unit is operating with the speed of other than 0rps, and when the outdoor heat

exchanger temperature (Th4) is less than -18°C.

(ii) Detail of operation: The inverter command speed upper limit and corresponding outdoor heat exchanger temperature

are set as follows.

(iii) Reset conditions: When the either of the following conditions is satisfied

1 When the outdoor heat exchanger temperature (Th4) becomes -16°C or higher. 2 When the inverter command speed is 0rps.

(i) Compressor protection start

(i) When the indoor unit calculated speed is 30rps or over at operation start, the unit is operated with 30rps for 1 minute and 45

seconds. After that when the calculated speed is 38rps or over, the unit is operated with 38rps for 1minute and 15 seconds.

After that when the calculated speed is 46rps or over, the unit is operated with 46rps for 1minute. After that when the

calculated speed is 54rps or over,the unit is operated with 54rps for 1minute then moved to command speed.

(ii) At thermo operation (OFF → ON) this control is not executed.

(iii) The indoor unit fan corresponds to the command speed of each operation mode.

Note (1) When the calculated speed is less than 30 rps, the unit is started with low load starting described in article (k).

(j) Inching prevention

When the compressor goes into the thermo operation within 5 minutes since operation start or becomes various dehumidifying

operations, the operation is continued with the command speed of 12 rps forcibly.

(k) Low load starting

(i) When the unit is started with calculated speed of less than 20 rps, it is operated with 20 rps for 60 seconds, then the operation

is moved to the command speed.

(ii) The indoor fan corresponds to the operation mode.

Cooling: Speed corresponding to the command speed of air flow switching

Dehumidification: Speed decided in the operation region

Heating: The lower one between the speed corresponding to the command speed and the hot keep speed

-16

ON: 70rps

OFF

ON: 40rps

ON: 20rps

-18-20-25

Outdoor heat exchanger temp.(°C)

(l) Freezing cycle system protective control

(i) Operating conditions: When both of following conditions have continued for more than 5 minutes later than 5 minutes

after the start of operation.

1) Inverter command speed is higher than 60 rps

2) During cooling, dehumidifying: Indoor heat exchanger temperature–Room temperature > –4ºC

During heating: Indoor heat exchanger temperature–Room temperature < 6ºC

(ii) Detail of operation: The inverter command speed repeats 30 minutes at 30rps↔2 minutes at 62 rps.

(iii) Reset conditions: When the condition becomes outside of either conditions 1) or 2) shown above

Note (1) This control is valid when the room air temperature is in the range of 10 to 40ºC at cooling and dehumidification operation and 0 to 40ºC at heating

operation.

(m) Prevention of continuous low speed operation: For oil return to compressor

(i) Operating conditions: When inverter command speed of less than 20 rps continues for 60 minutes

(ii) Detail of operation: The unit is operated at inverter command speed of 30 rps forcibly for 15 seconds. (The indoor and

outdoor fans are not changed.)

Note (1) When the inverter command of exceeding 30 rps is directed during 30 rps forced operation, the unit follows it.

(n) Current cut

(i) Purpose: Inverter is protected from overcurrent.

(ii) Detail of operation: Output current from the converter is monitored with a shunt resistor and, if the current exceeds the

setting value, the compressor is stopped immediately. Operation starts again after a delay time of 3

minutes.

(o) Outdoor unit failure

This is a function for determining when there is trouble with the outdoor unit during air conditioning.

The compressor is stopped if any one of the following in item 1), 2) is satisfied. Once the unit is stopped by this function, it is not

restarted.

1) When the input current is measured at 1 A or less for 3 continuous minutes or more.

2) If the outdoor unit sends a 0 rps signal to the indoor unit 3 times or more within 20 minutes of the power being turned on.

(p) Current safe

(i) Purpose: Current is controlled not to exceed the upper limit of the setting operation current.

(ii) Detail of operation: Input current to the converter is monitored with the current sensor fixed on the printed circuit board

of the outdoor unit and, if the operation current value reaches the limiting current value, the outdoor

unit speed is reduced.

If the mechanism is actuated when the speed of outdoor unit is less than 20 rps, the compressor is

stopped immediately. Operation starts again after a delay time of 3 minutes.

(q) Power transistor overheat protection

(i) Purpose: In order to prevent the power transistor overheating during operation, faulty controller operations, deterioration,

damage and so on occurs.

(ii) Detail of operation:

1 Power transistor sensor temperature

110ºC

The compressor is stopped immediately. When the power transistor sensor temperature is less than 80°C, restart.

2 90ºC

Power transistor sensor temperature < 110ºC

The outdoor unit speed drops to 4 rps. After 20 seconds, the outdoor unit speed performs the following controls, accord-

ing to the power thansistor sensor temperature.

3 80ºC

Power transistor sensor temperature < 90ºC

Maintain the outdoor unit speed. When the rotation speed is the same for 6 minutes, or when the power transistor sensor temperature is less than 80°C. The speed is raised by 2rps and kept at that speed for 1 minute. This process is repeated

until the inverter command speed is reached.

If the previous sensor temperature

< =

current sensor temperature reduce by 4rps

If the previous sensor temperature > current sensor temperature reduce by 2rps

Notes (1) When the discharge pipe temperature is in the range of 100 to 110ºC, the speed is reduced by 4 rps.

(2) When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps.

(3) If the discharge pipe temperature is still 90 ºC or greater but less than 100 ºC even when the inverter command speed is maintained for 3 minutes

when the temperature is 90 ºC or greater but less than 100 ºC, the speed is raised by 1 rps and kept at that speed for 3 minutes. This process is

repeated until the calculated speed is reached.

2) If the temperature of 110ºC is detected by the sensor on the discharge pipe, then the compressor will stop immediately.

When the discharge pipe temperature drops and the time delay of 3 minutes is over, the unit starts again within 1 hour but

there is no start at the third time.

(s) Serial signal transmission error protection

(i) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals.

(ii) Detail of operation: If the compressor is operating and a serial signal cannot be received from the indoor control with

outdoor control having serial signals continuously for 1 minute and 55 seconds, the compressor is

stopped.

After the compressor has been stopped, it will be restarted after the compressor start delay if a serial

signal can be received again from the indoor control.

(RUN light: ON, TIMER light: 6 times flash)

(r) Compressor overheat protection

(i) Purpose: It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the compressor

overheat.

(ii) Detail of operation

1) Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.

Discharge pipe temperature (˚C)

After lapse of 3 min. or over

(3)

After lapse of 3 min. or over

(3)

After lapse of 3 min. or over

(3)

4 rps

(1)

0 rps

(Example) Fuzzy

90 100 110

Lower limit speed 20rps

Cooling Heating

Lower limit speed 20rps 20rps

Mitsubishi Heavy Industries SRK63ZE-S1, SRK25ZD-S1, SRK35ZD-S1, SRK50ZD-S1, SRK71ZE-S1 Technical Manual

Specifications and Main Features

Frequently Asked Questions

User Manual