Mitsubishi Heavy Industries SRK20ZG-S, SRK50ZG-S, SRK25ZG-S, SRK35ZG-S, SRK25ZG-SS Technical Manual

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

SRK20ZG-S, SRK25ZG-S, SRK35ZG-S, SRK50ZG-S

Manual No. ’06

SRK-T

060

CONTENTS

1 GENERAL INFORMATION.................................................................... 1

1.1 Specific features............................................................................ 1

1.2 How to read the model name ....................................................... 1

2 SELECTION DATA ................................................................................ 2

2.1 Specifications ................................................................................ 2

2.2 Range of usage & limitations ....................................................... 6

2.3 Exterior dimensions ...................................................................... 6

2.4 Piping system ................................................................................ 8

2.5 Selection chart .............................................................................. 9

3 ELECTRICAL DATA .............................................................................. 10

3.1 Electrical wiring ............................................................................. 10

4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER ......... 12

4.1 Operation control function by remote control switch................ 12

4.2 Unit ON/OFF button....................................................................... 13

4.3 Power blackout auto restart function .......................................... 13

4.4 Custom cord switching procedure .............................................. 13

4.5 Flap and louver control................................................................. 14

4.6 3D auto operation .......................................................................... 15

4.7 Timer operation ............................................................................. 16

4.8 Installation location setting .......................................................... 16

4.9 Outline of heating operation ........................................................ 17

4.10 Outline of cooling operation ........................................................ 18

4.11 Outline of automatic operation .................................................... 18

4.12 Protective control function........................................................... 19

5 APPLICATION DATA ............................................................................. 24

5.1 Selection of location for installation ........................................... 25

5.2 Installation of indoor unit ............................................................. 26

5.3 Installation of outdoor unit ........................................................... 29

5.4 Connection of refrigerant pipings ............................................... 29

5.5 Test run .......................................................................................... 31

5.6 Precautions for wireless remote control installation and

operation ........................................................................................ 31

6 MAINTENANCE DATA .......................................................................... 32

6.1 Troubleshooting procedures for electrical equipment .............. 32

6.2 Servicing ........................................................................................ 51

7 INTERFACE KIT (OPTIONAL PARTS).................................................. 52

7.1 Applicable model........................................................................... 52

7.2 List of connectable devices ......................................................... 52

7.3 Exterior dimensions ...................................................................... 52

7.4 Circuit board component layout .................................................. 52

7.5 System configuration.................................................................... 53

7.6 Installation of interface kit ............................................................ 54

7.7 Wired remote control .................................................................... 59

7.8 Insatallation of wired remote control .......................................... 60

7.9 Setting functions using the wired remote control ..................... 61

7.10 Super link adapter ......................................................................... 65

7.11 Operation permission/prohibition control .................................. 67

7.12 External control (remote display) /control of input signal......... 68

8 REFRIGERANT PIPING INSTALLATION / SERVICING MANUAL

FOR AIR CONDITIONERS USING R410A........................................... 69

8.1 Outline ............................................................................................ 69

8.2 Refrigerant piping installation ..................................................... 70

8.3 Installation, removal and servicing.............................................. 76

8.4 Refrigerant recovery ..................................................................... 81

Over heat of compressor

Error of signal transmission

Outdoor fan motor error

1 GENERAL INFORMATION

1.1 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.

(1) 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.

(2) 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.

(3) Remote control flap & louver

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. ¡3D auto operation : Fan speed and air flow direction are automatically controlled, allowing the entire room to be efficiently

conditioned.

¡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.

(4) 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

1.2 How to read the model name

Example : SR K 35 Z G - S

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

4 time flash

Power transistor error

Item

Model

SRK20ZG-S SRC20ZG-S

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 35, Me 29, Lo 21 44

Noise level

Power level

51 58

Heating

Sound level Hi 35, Me 32, Lo 25 45

Power level 53 59

Exterior dimensions

Height × Width × Depth

268 × 790 × 199 540 × 780 × 290

Color Fine snow Stucco white Net weight kg 8.5 35 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 38 24

(Cooling) 7.4 30

Air flow (at High)

(Heating)

CMM

8.5 23

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), 3D AUTO (Green)

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: 0.4 m

Gas line : 0.33 m

–

Insulation Necessary (Both sides) Drain hose Connectable Power source cord 2 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 (Allergen clear filter x1, Photocatalytic washable deodorizing filter x1)

Optional parts Interface kit

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

2 SELECTION DATA

2.1 Specifications

Model SRK20ZG-S (Indoor unit)

SRC20ZG-S (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.)

(4) If the interface kit (SC-BIK-E) (sold separately) is connected to the terminals on the indoor unit’s circuit board, a wired remote control (sold separately)

can be connected, a Super Link can be connected, and the unit can be turned on and off from a CNT terminal.

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

SRK25ZG-S SRC25ZG-S

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 0.93 (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: 3.66

Cooling

Sound level Hi 36, Me 30, Lo 22 44

Noise level

Power level

52 58

Heating

Sound level Hi 36, Me 33, Lo 26 47

Power level 54 62

Exterior dimensions

Height × Width × Depth

268 × 790 × 199 540 × 780 × 290

Color Fine snow Stucco white Net weight kg 8.5 35 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 38 24

(Cooling) 7.6 30

Air flow (at High)

(Heating)

CMM

8.7 23

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), 3D AUTO (Green)

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: 0.4 m

Gas line : 0.33 m

–

Insulation Necessary (Both sides) Drain hose Connectable Power source cord 2 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 (Allergen clear filter x1, Photocatalytic washable deodorizing filter x1)

Optional parts Interface kit

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

Model SRK25ZG-S (Indoor unit)

SRC25ZG-S (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.)

(4) If the interface kit (SC-BIK-E) (sold separately) is connected to the terminals on the indoor unit’s circuit board, a wired remote control (sold separately)

can be connected, a Super Link can be connected, and the unit can be turned on and off from a CNT terminal.

Operation data

(1)

Refrigerant

piping

The piping length is 7.5m.

(220/230/240V)

Item

Model

SRK35ZG-S SRC35ZG-S

Cooling capacity

(1)

W 3500 (500~3900)

Heating capacity

(1)

W 4200 (500~5100)

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

Cooling input kW 1.05 (0.1~1.22)

Running current (Cooling) A 4.9/4.7/4.5

Heating input kW 1.14 (0.09~1.32)

Running current (Heating) A 5.3/5.1/4.9

Inrush current A 5.3/5.1/4.9

COP Cooling: 3.33 Heating: 3.68

Cooling

Sound level Hi 40, Me 32, Lo 23 48

Noise level

Power level

56 62

Heating

Sound level Hi 41, Me 36, Lo 27 50

Power level 59 64

Exterior dimensions

Height × Width × Depth

268 × 790 × 199 540 × 780 × 290

Color Fine snow Stucco white Net weight kg 8.5 38 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 38 24

(Cooling) 8.5 30

Air flow (at High)

(Heating)

CMM

10.8 33

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), 3D AUTO (Green)

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: 0.4 m

Gas line : 0.33 m

–

Insulation Necessary (Both sides) Drain hose Connectable Power source cord 2 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 (Allergen clear filter x1, Photocatalytic washable deodorizing filter x1)

Optional parts Interface kit

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

Model SRK35ZG-S (Indoor unit)

SRC35ZG-S (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.)

(4) If the interface kit (SC-BIK-E) (sold separately) is connected to the terminals on the indoor unit’s circuit board, a wired remote control (sold

separately) can be connected, a Super Link can be connected, and the unit can be turned on and off from a CNT terminal.

Operation data

(1)

Refrigerant

piping

The piping length is 7.5m.

(220/230/240V)

Model SRK50ZG-S (Indoor unit)

SRC50ZG-S (Outdoor unit)

Item

Model

SRK50ZG-S SRC50ZG-S

Cooling capacity

(1)

W 5000 (600~5300)

Heating capacity

(1)

W 5800 (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 1.70 (0.11~2.71)

Running current (Heating) A 7.9/7.5/7.2

Inrush current A 7.9/7.5/7.2

COP Cooling: 3.01 Heating: 3.41

Cooling

Sound level Hi 47, Me 42, Lo 26 48

Noise level

Power level

61 61

Heating

Sound level Hi 48, Me 40, Lo 34 50

Power level 62 64

Exterior dimensions

Height × Width × Depth

268 × 790 × 199 640 × 850 × 290

Color Fine snow Stucco white Net weight kg 8.5 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 38 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 control –

Room temperature control Microcomputer thermostat – Pilot lamp RUN (Green), TIMER (Yellow), HI POWER (Green), 3D AUTO (Green)

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: 0.4 m

Gas line : 0.33 m

–

Insulation Necessary (Both sides) Drain hose Connectable Power source cord 2 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 (Allergen clear filter x1, Photocatalytic washable deodorizing filter x1)

Optional parts Interface kit

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.

(4) If the interface kit (SC-BIK-E) (sold separately) is connected to the terminals on the indoor unit’s circuit board, a wired remote control (sold

separately) can be connected, a Super Link can be connected, and the unit can be turned on and off from a CNT terminal.

Operation data

(1)

Refrigerant

piping

The piping length is 7.5m.

(220/230/240V)

2.2 Range of usage & limitations

2.3 Exterior dimensions

(1) Indoor unit

Models SRK20ZG-S, 25ZG-S, 35ZG-S, 50ZG-S

Indoor return air temperature (Upper, lower limits)

Refrigerant line (one way) length Max. 15m

SRK20ZG-S, 25ZG-S, 35ZG-S SRK50ZG-S

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)

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

Unit: mm

Piping hole (ø65)

( )

Piping hole (ø65)

53.5

380.6

Pipng for Liquid 448.6 (ø6.35)

20, 25, 35 : ø9.52 50 : ø12.7

Pipng for Gas

Drain hose 520 (ø16)

53.5

44.5

252.2

7.5

8.3

102.5

585

102.5

133.5450206.5

202450138

44.5

43.2

39.3

200

17.5

788

199

Terminal block

Piping hole right(left)

268

790

VIEW A

→

Drain holes

286.4

290

49.6

43.5

850

203.1

510 136.9

476

2-16×12

314

328

Terminal block

Service valve (Liquid)

ø6.35 (1/4'')

Service valve (Gas)

ø12.7 (1/2'')

Ground terminal

124

34.6

20˚

42.7

100.3

640

Model SRC50ZG-S

Unit: mm

(2) Outdoor unit

Models SRC20ZG-S, 25ZG-S, 35ZG-S

2-16×12

Drain holes (ø20)

138.4

61.9

18.9165.1510104.9

439.1

111.4

99.4

349.5

313.1

43.1

290

350

23.5312.5

33.5

42.595.9

540

780

Service valve (Liquid)

Flare connection ø6.35 (1/4'')

Service valve (Gas)

Flare connection ø9.52 (3/8'')

Terminal block

2.4 Piping system

Models SRK20ZG-S, 25ZG-S, 35ZG-S

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 SRK50ZG-S

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

Humidity sensor (35 type only)

Humidity sensor

2.5 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.

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

(2) 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.

(3) Correction relative to frosting on outdoor heat exchanger during heating

In additions to the foregoing corrections (1), (2) 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 SRK20ZG-S 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

Piping length [m]

Cooling

Heating

1.0

0.99

1.0

0.975

1.0

0.965

1.0

0.95

1.0

SRK20ZG-S

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

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

3 ELECTRICAL DATA

3.1 Electrical wiring

Models SRK20ZG-S, 25ZG-S, 35ZG-S

Indoor unit Outdoor unit

BL Y

WH BK RD

CNU

CNM

52C

CNX

CNY

R-AMP

WIRELESS

DISPLAY

CNE

BACK UP SW

BOARD

PRINTED CIRCUIT

PRINTED CIRCUIT BOARD

CNG

(35 TYPE ONLY)

CNF

250V 3.15A

52C

ZNR

52C-4 52C-3NGJ

2/N

Y/GN

RD WH

Y/GN

EXCHANGER

HEAT

Y/GN

220/230/240V 50Hz

1 Phase

POWER SOURCE

BOX

CONTROL

TB TB

250V 15A

R.IN C-2S.IN

POWER

TRANSISTOR

CND

CNA

CNB

20S

EEV

CNE

BK BL BR

Y/G

Color symbol

Black Blue Brown

Yellow

White

Light blue

Yellow/Green

Red

Meaning of marks

Symbol

Parts name

Symbol

Parts name

Symbol

Parts name

CM F FM

SM LM

Compressor motor Fuse Fan motor(Indoor) Fan motor(Outdoor) Flap motor Louver motor(L)

Louver motor(R)

Room temp.sensor Heat exch.sensor(Indoor unit)

ZNR

20S EEV DSHumidity sensor

Heat exch.sensor(Outdoor unit)

TB Terminal blockOutdoor air temp.sensor Discharge pipe temp.sensor Varistor

4 way valve(coil) Electronic expansion valve Diode stack

L Inductor

Model SRK50ZG-S

Indoor unit Outdoor unit

BL Y

WH BK RD

CNU

CNM

CNX

CNY

R-AMP

WIRELESS

DISPLAY

CNE

BACK UP SW

BOARD

PRINTED CIRCUIT

CNG

22 2

CNF

250V 3.15A

250V 15A

52C

ZNR

52C-4 52C-3NGJ

2/N

Y/GN

RD WH

Y/GN

EXCHANGER

HEAT

Y/GN

220/230/240V 50Hz

1 Phase

POWER SOURCE

BOX

CONTROL

TB TB

BK BL BR

Y/G

Color symbol

Black Blue Brown

GR Gray

Yellow

White

Light blue

OR Orange

Yellow/Green

Red

Meaning of marks

Symbol

Parts name

Symbol

Parts name

Symbol

Parts name

CM F FM

SM LM

Compressor motor Fuse Fan motor(Indoor) Fan motor(Outdoor) Flap motor Louver motor(L)

Louver motor(R)

Room temp.sensor Heat exch.sensor(Indoor unit)

ZNR

20S

EEV

DSHumidity sensor Heat exch.sensor(Outdoor unit)

Terminal block

Outdoor air temp.sensor Discharge pipe temp.sensor Varistor

4 way valve(coil) Electronic expansion valve Diode stack

L Inductor

20S

CNT

CNB

CND

EEV

CNJ

CNI

CNH CNH

CNGCNG

PWB1(MAIN)

PWB2(POWER)

AF_L2

AF_L1

OROR

N_1

P_1

AC.N

AC.L

AC.N AC.L

N_1

P_1

DC-N

DC-P

CNG

PWB3(CAPACITOR)

L-1G3 N-1 CNO.1

Y/G

52C

Models All models

Remote control

S Operation section

OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

4.1 Operation control function by remote control switch

RUN TIMER

ON / OFF

HI POWER 3D AUTO

OFF

1.5 sec.

0.5 sec.

3D AUTO light (green)

Illuminates during 3D AUTO operation.

HI POWER light (green)

Illuminates during HIGH POWER operation.

RUN (HOT KEEP) light (green)

• Illuminates during operation and CLEAN

operation.

•

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

TIMER light (yellow)

Illuminates during TIMER operation.

In emergencies, this button can be used for turning on/off the unit when remote control is not available.

Remote control signal receiver

Unit ON/OFF button

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 pushed, the indicator is switched over in turn.

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 air flow (up/down) mode.

This button changes the air flow (left/right) mode.

SLEEP button

This button selects 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

3D AUTO button

This button sets 3D AUTO operation.

This button selects ALLERGEN CLEAR operation.

ALLERGEN CLEAR button

RESET switch

Switch for resetting microcomputer and setting 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.)

This button cancels the ON timer, OFF timer, and SLEEP operation.

CANCEL button

Unit indication section

Models All models

Unit ON/OFF button

4.2 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.

(1) Operation

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

(2) 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

4.3 Power blackout auto restart function

(1) 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.

(2) The following settings will be cancelled:

(a) Timer settings

(b) 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 (J12) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram at right)

4.4 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.

(1) Modifying the indoor unit’s printed circuit board

Take out the printed circuit board from the control box and cut off jumper wire (J13)

using wire cutters.

After cutting of the jumper wire, take measures to prevent contact with the other the lead

wires, etc.

(2) Modifying the wireless remote control

(a) Remove the battery.

(b) Cut the jumper wire shown in the figure at right.

Jumper wire (J12)

Jumper wire (J13)

Cut

4.5 Flap and louver control

Control the flap and louver by AIRFLOW

 

(UP/DOWN) and



(LEFT/RIGHT) button on the wireless remote control.

(1) Flap

Each time when you press the AIRFLOW

 

(UP/DOWN) button the mode changes as follows.

(2) Louver

Each time when you press the AIRFLOW



(LEFT/RIGHT) button the mode changes as follows.

(3) Swing

(a) Swing flap

Flap moves in upward and downward

directions continuously.

(b) Swing louver

Louver moves in left and right directions continuously.

(4) Memory flap (Flap or Louver stopped)

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.

(5) When not operating

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

COOL , DRY

Remote control display

HEAT

• Angle of Flap from Horizontal

Approx. 10

Approx. 20˚

Approx. 35˚

Approx. 30˚

Approx. 50˚

Approx. 45˚

Approx. 60˚

Approx. 70˚

(Swing)

(Flap stopped)

Center installation

Remote control display

Right end installation

Left end installation

• Angle of Louver

Left Approx. 45˚

Left Approx. 20˚

Left Approx. 30˚

Center

Left Approx. 20˚

Right Approx. 20˚

Center

Right Approx. 45˚

Right Approx. 20˚

Left Approx. 20˚

Center

Right Approx. 20˚ Right Approx. 30˚ Right Approx. 45˚

(Louver stopped)

(Swing) (Spot) (Wide)

S In HEAT operation S In COOL, DRY operation S In HEAT operation S In COOL, DRY operation

Approx. 30˚

Approx. 70˚

Approx.

10˚

Approx. 30˚

4.6 3D auto operation

Control the flap and louver by 3D AUTO button on the wireless remote control.

Air flow selection and air flow direction are automatically controlled, allowing the entire room to efficiently conditioned.

(1) During Cooling and Heating (Including auto cooling and heating)

(a) Air flow selection is determined according to room temperature and setting temperature.

(b) Air flow direction is controlled according to the room temperature and setting temperature.

1) When 3D auto operation starts

2) When Room temp. – Setting temp. is ≤_ 5ºC during cooling and when Setting temp. – Room temp. is ≤_ 5ºC during

heating, the system switches to the following air flow direction control. After the louver swings left and right symmetrically

for 3 cycles, control is switched to the control in 3).

3) After the flap swings for 5 cycles, control is switched to the control in 4).

4) For 5 minutes, the following air flow direction control is carried out.

5) After 5 minutes have passed, the air flow direction is determined according to the room temperature and setting

temperature.

(2) During DRY Operation (including auto DRY operation)

At cooling

Air flow selection

Operation mode

AUTO HI MED LO

At heating

Room temp. – Setting temp. >5˚C Room temp. – Setting temp. ≤_ 5˚C

Setting temp. – Room temp. >5˚C Setting temp. – Room temp. ≤_ 5˚C

HIGH POWER AUTO

HI MED LO

HIGH POWER AUTO

Flap Louver

Cooling

Up/down Swing

Heating

Wide (fixed) Center (fixed)

Flap Louver

Cooling Heating

Left/right Swing

Horizontal blowing (Fixed) Slant forwardl blowing (Fixed)

Flap Louver

Cooling

Up/down Swing

Heating

Center (Fixed)

Wide (Fixed)

Flap Louver

Cooling Heating

Horizontal blowing (Fixed) Slant forwardl blowing (Fixed)

Operation mode

Room temp. – Setting temp. ≤_ 2˚C

Setting temp. – Room temp. ≤_ 2˚C

At heating

At cooling

Air flow direction contorol

2˚C < Setting temp.

–

Room temp. ≤_ 5˚C

2˚C < Room temp.

–

Setting temp. ≤_ 5˚C

Room temp. – Setting temp. > 5˚C

Setting temp. – Room temp. > 5˚C

The control in 4) continues. Control returns to the control in 2). Control returns to the control in 1).

Wide (Fixed)

Flap

Air flow selection

Louver

According to DRY operation.

Horizontal blowing (Fixed)

(2) Sleep timer operation

Pressing the SLEEP button causes the temperature to be controlled as shown in the following chart with respect to the set tempera-

ture.

4.7 Timer operation

(1) Comfortable timer setting (ON timer)

(3) OFF timer operation

The Off timer can be set at a specific time (in 10-minute units) within a 24-hour period.

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.

4.8 Installation location setting

When the indoor unit is installed at the end of a room, control the air flow direction so that it is not toward the side walls. If you set the

remote control’s installation position, keep it so that the air flow is within the range shown in the following figure.

(1) Setting

1 If the air conditioning unit is running, press the ON/OFF button to stop.

The installation location setting cannot be made while the unit is running.

2 Press the AIR FLOW

 

(UP/DOWN) button and the

AIRFLOW



(LEFT/RIGHT) button together for 5 seconds

or more.

The installation location display illuminates.

3 Setting the air-conditioning installation location.

Press the AIR FLOW



(LEFT/RIGHT) button and adjust to the desired

location.

Each time the AIR FLOW



(LEFT/RIGHT) button is pressed, the

indicator is switched in the order of:

4 Press the ON/OFF button.

The air-conditioner's installation location is set.

Press within 60 seconds of setting the installation location (while the

installation location setting display illuminates).

Airflow range Airflow range Airflow range

(Left End Installation) (Center Installation) (Right End Installation)

1, 4

2 3

(Center Installation) (Right End Installation) (Left End Installation)

4.9 Outline of heating operation

(1) Operation of major functional components in heating mode

(2) Details of control at each operation mode (pattern)

(a) 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.

When the defrosting, protection device, etc. is actuated, operation is performed in the corresponding mode.

(b) 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.

ON OFF OFF

ON ON OFF

OFF

(few minutes ON)

OFF

ON ON(HOT KEEP) OFF

OFF

(3 minutes ON)

OFF

Thermostat ON Thermostat OFF Defrost Failure

Heating

Compressor

Indoor fan motor

Outdoor fan motor

4-way valve

30~100rps 30~102rps 15~122rps

30~70rps 30~72rps 30~84rps 15~84rps

30~44rps 30~54rps 30~62rps 15~66rps

SRK20ZG-S

Model

Fan speed

SRK25ZG-S SRK35ZG-S SRK50ZG-S

Auto

MED

(3) Defrosting operation

(a) 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 45 minutes (35, 50 type : 35 minutes). (Accumulated compressor operation time)

2 After end of defrosting operation

When it elapsed 45 minutes(35, 50 type : 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 The difference between the outdoor air sensor temperature and the outdoor unit heat exchanger sensor temperature

¡ The outdoor air temperature ≥_ -17°C : 7°C (35type : 5°C, 50type : 4°C) on higher ¡ The outdoor air temperature < -17°C : -5°C or higher

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, 3 and 5 above and the outdoor air temperature is 3°C or less 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.

(b) 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

2 Continued operation time of defrosting → For more than 10 min.

27.5

25.5

19.5

4.10 Outline of cooling operation

(1) Operation of major functional components in Cooling mode

(2) Detail of control in each mode (Pattern)

(a) 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.

ON OFF OFF

OFF OFF OFF

OFF

(few minutes ON)

OFF

(few minutes ON)

ON ON ON

Thermostat ON Thermostat OFF Failure

Cooling

Compressor

Indoor fan motor

Outdoor fan motor

4-way valve

20~64rps 20~68rps 15~100rps

20~64rps 20~68rps

20~98rps

20~98rps 15~100rps

20~48rps 20~52rps 20~74rps 15~62rps

20~32rps 20~38rps 20~46rps 15~30rps

SRK20ZG-S

Model

Fan speed

SRK25ZG-S SRK35ZG-S SRK50ZG-S

Auto

MED

4.11 Outline of automatic operation

(1) Determination of operation mode

The unit checks the room temperature and the outdoor air temperature, determines the operation mode, and then begins in the

automatic operation.

Heating

Dehumidifying

Cooling

Room temperature (˚C)

Outdoor temperature (˚C)

(2) 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.

(3) 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.

(4) 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

4.12 Protective control function

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

(a) 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.

(b) Detail of anti-frost operation

5°C or lower 2.5°C or lower

Item

20, 25 type : 44 rps

Upper limit speed 35 type : 70 rps 0rps

50 type : 76 rps

Indoor fan Depends on operation mode

Protects the fan tap just before

frost prevention control

Outdoor fan Depends on operation mode

Depends on stop mode

4-way valve OFF

(c) 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.

Indoor heat exchanger

temperature

Indoor heat exchanger

temperature (°C)

2.5 5 8

0 rps

Upper

limit

speed

Inverter

command

speed

(2) Cooling overload protective control

(a) 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.

(b) 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.

1 When the outdoor air temperature becomes 40ºC or less.

2 When the inverter command speed is 0rps.

(3) Cooling low outdoor temperature protective control

◆ < I >

(a) Operating conditions: When the outdoor air temperature sensor (Th5) is 22ºC or lower continues for 30 seconds while

outdoor speed is other than 0rps.

(b) Detail of operation: After the outdoor fan operates at A speed for 60 seconds; the corresponding outdoor heat

exchanger temperature shall implement the following controls.

1 Outdoor heat exchanger temperature

21ºC

After the outdoor fan speed drops (down) to one speed for 60 seconds; if the outdoor heat exchanger temperature is

lower than 21°C, gradually reduce the outdoor fan speed by 1 speed. (Lower limit speed is 1st speed)

2 21ºC < Outdoor heat exchanger temperature

38ºC

After the outdoor fan speed maintains at A speed for 20 seconds; if the outdoor heat exchanger temperature is 21°C~

38°C, maintain outdoor fan speed.

3 Outdoor heat exchanger tempeature > 38ºC

After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is

higher than 38°C, gradually increase outdoor fan speed by 1 speed. (Upper limit speed is 3rd speed)

1 When the outdoor air temperature sensor (Th5) becomes 25ºC or higher. 2 When the inverter command speed is 0rps.

Outdoor temperature > 10˚C

Outdoor temperature ≤_ 10˚C

2nd speed

Outdoor fan

1st speed

¡ Value of A

◆ < II >

(a) Operating conditions: When the outdoor air temperature sensor (Th5) is 22ºC or lower continues for 30 seconds while

outdoor speed is other than 0rps.

(b) Detail of operation:

1 The lower limit of inverter command speed is set to C(D)rps and even if the speed becomes lower than C(D)rps, the

speed is kept to C(D)rps. However, when the thermo becomes OFF, the speed is reduced to 0rps.

2 The upper limit of control speed is set to A(B)rps and even if the calculated result becomes higher than that after fuzzy

calculation, the speed is kept to A(B)rps.

22 25

OFF

Upper limit Arps Lower limit Crps

Upper limit Brps Lower limit Drps

Outdoor air temp.(°C)

20, 25, 35 type

50 type

Upper limit Lower limit

BCD

60 30 30

50 60 44 30

¡ Values of A, B, C, D

1 When the outdoor air temperature sensor (Th5) becomes 25ºC or higher.

2 When the inverter command speed is 0rps.

(4) High pressure control

(a) Purpose: Prevents anomalous high pressure operation during heating.

(b) Detector: Indoor unit heat exchanger sensor (Th2)

Indoor unit heat exchanger temperature(˚C)

4rps

(1)

8rps

(2)

8rps

(2)

4rps

(1)

0rps

After lapse of 20 sec. or over

(3)

After lapse of 20 sec. or over

(3)

After lapse of 20 sec. or over

(3)

lower limit

speed 20(35) rps

(Example) Fuzzy

Notes (1) When the indoor unit heat exchanger temperature is in the range of B~C ºC, the speed is reduced by 4 rps at each 20 seconds.

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

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

(3) 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.

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

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

ABCD

RPSmin < 40(88) 48 (48.5) 53 (55) 55 (58) 58 (61)

40(88)

< =

RPSmin < 50(108)

48 (44) 53 (50.5) 55 (53) 58 (56.5)

50(108)

< =

RPSmin 48.5 (39) 56 (45.5) 58 (48) 61 (51.5)

Unit : ºC

(5) Heating overload protective control

(a) 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.

(b) Detail of operation:

1 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.

2 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.

3 Inching prevention control is activated and inching prevention control is carried out with the minimum speed set at 40

(35) rps.

4 The outdoor fan is set on 2nd speed.

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

(6) Heating low outdoor temperature protective control

◆ <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) Detail of operation:

1 When the command speed is less than 40(22) rps, the command speed is forcibly set at 40(22) rps. However, when the

thermo becomes OFF, the speed is reduced 0 rps.

2 Inching prevention control is activated and inching prevention control is carried out with the minimum speed set at 40

(22) rps.

1 When the outdoor air temperature sensor (Th5) becomes 6ºC or higher.

2 When the inverter command speed is 0 rps.

◆ <II >

(a) Operating conditions: When the outdoor air temperature sensor (Th5) is 0ºC or lower continuously for 30 seconds while

the outdoor speed is other than 0 rps.

(b) Detail of operation: The outdoor fan motor speed is stepped up by 1(2) speed step. (Upper limit 7th speed)

1 When the outdoor air temperature sensor (Th5) becomes 2ºC or higher.

2 When the inverter command speed is 0 rps.

◆ <III > (SRK50ZG-S only)

(a) Operating conditions: When the outdoor heat exchanger sensor (Th4) is –10ºC or lower continuously for 10 minutes

while the outdoor speed is other than 0 rps.

(b) Detail of operation: When the command speed upper limit is set at 50 rps.

1 When the outdoor heat exchanger sensor (Th4) becomes -7ºC or higher.

2 When the inverter command speed is 0 rps.

3 After 2 minutes have passed since this control started.

(7) Compressor overheat protection

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

overheat.

(b) 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) 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 rps 30 rps

50 type 22 rps 38 rps

(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.

(8) Current safe

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

(b) 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 30 rps, the compressor is

stopped immediately. Operation starts again after a delay time of 3 minutes.

(9) Current cut

(a) Purpose: Inverter is protected from overcurrent.

(b) 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.

(10) 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.

(11) 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 lower limit speed forcibly.

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

(12) 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.

(13) Serial signal transmission error protection

(a) Purpose: Prevents malfunction resulting from error on the indoor ↔ outdoor signals.

(b) 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.

(14) Rotor lock

If the motor for the compressor does not turn 1/12 revolution 0.044 seconds after it has been started, it is determined that a

compressor lock has occurred and the compressor is stopped.

(15) Outdoor fan motor protection

If the outdoor fan motor has operated at 75rpm or under for more than 30 seconds, the inverter and fan motor are stopped.

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. ¡ When a plug is connected to the power cord, a plug conforming to the IEC60884-1 standard must be used. ¡ 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.

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

can also result in 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 (R410A) 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.

Not 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 event 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.

5.1 Selection of location for installation

(1) Indoor unit

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

air can be evenly distributed.

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

(Where space mentioned right can be secured)

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

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

the sun or the strong rays of the street lighting.

(f) A place where it can be easily drained.

(g) A place separated at least 1m away from the television or the radio.

(To prevent interference to images and sound.)

(2) Outdoor unit

(a) A place where good air circulation can be obtained and where rain, snow or sunshine will not directly strike the unit.

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

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

(e) Avoid installing in the following palces.

• A place near the bed room and the like, so that the operation noise will cause no trouble.

• A place where there is possibility of flammable gas leakage.

• A place exposed to strong wind.

• In a salt-laden atmosphere or a place where the generation of oil mist, vapor or fume is expected.

(f) 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.

(3) Limitations for one way piping length and vertical

height difference.

Snow hood

Height: Must be over the possible snow deposit height

6.5 cm

5 cm

10 cm

Right side

Left side

Notes (1) Blowing out port and suction port on the back side of the unit can be

installed at a distance of 10cm from walls.

In case the barrier is 1.2m or above in height, or is overhead, the

sufficient space between the unit and wall shall be secured.

(2) When the unit is installed, the space of the following dimension and

above shall be secured.

( )

60 cm MIN

Air intake

10 cm MIN

Air outlet

Air intake

No obstacles (Service space for electrical parts)

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

Vertical height difference (h)

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

5.2 Installation of indoor unit

(1) Installation of installation board

(a) Fixing of installation board

(2) 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.

(a) Drill a hole with ø65

whole core drill

(b) Adjusting sleeve length

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

Standard hole

(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

INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW)

Unit : mm

Piping hole( 65) Piping hole( 65)

Installation board

Indoor unit

53.5

Piping for Gas 380.6

Piping for Liquid 448.6

Drain hose 520( 16)

53.5

Space *

for service

Space

for service

44.5

252.2

7.5

8.3

Space for

service

Space for service 100

102.5

585

102.5

133.5

450206.5

202450138

44.5

43.2

39.3

200

* Leave extra space on the right side to enable removal of the lid screw.

Fixing on concrete wall

Use of nut anchor Use of bolt anchor

Bolt (M6 × 12)

Mounting board

Nut (M6)

Mounting board

Max. 10

Piping for Liguid (20~50type) : ø6.35 Piping for Gas (20~35type) : ø9.52

(50type) : ø12.7

(3) Preparation of indoor unit

(a) Mounting of connecting wires

1) Remove the lid(R).

2) Remove the wiring clamp.

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

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.

4) Fix the connecting wire by wiring clamp.

5) Attach the lid.

6) Close the air inlet panel.

(b) Installing the support of piping

Use cables for interconnection wiring to avoid loosening of the wires. CENELEC code for cables. Required field cables. H05RNR4G1.5 (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 (mm2)

[Matters of special notice when piping from left or center/rear of the unit.]

Piping

Drain hose

¡ Tape only the portion that goes through the wall.

Always tape the crossover wiring with the piping.

¡ Hold the bottom of the piping and fix direction before

stretching it and shaping it.

[Top View]

[Shaping the piping] [Taping of the exterior]

Left-hand-sided-piping

Piping in the left rear direction

Piping in the right rear direction

Right

Rear

Downward

Left rear

Left downward

Left

Piping in the left direction

Piping in the right direction

Right-hand-sided-piping

Piping is possible in the rear, left, left lear, left downward, right or downward direction.

Lid

Screw *

Clam

Terminal block

*Leave space to allow removal of this screw after installation.

[Drain hose changing procedures]

1. Remove the drain hose.

¡Remove the drain hose,

making it rotate.

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

Pipe accommodation section

Drainage

¡ Arrange the drain hose in a downward angle.

¡ Avoid the following drain piping.

Higher than specified The drain hose

tip is in water.

Weavy The gap to the ground

is 5 cm or less.

The drain hose tip is in the gutter.

Odor from the gurtter

¡ Pour water to the drain pan located under the heat exchanger, and ensure that the water is discharged outdoor.

¡ When the extended drain hose is indoor, always use a shield pipe (to be arranged by the user) and ensure it is thermally

insulated.

Shield pipe

Extended drain hose

When it is exposed indoor.Drain hose

¡ How to remove the indoor unit from the installation board

1 Push up at the marked portion of the indoor unit base

lower latch, and slightly pull it toward you. (both right and left hand sides) (The indoor unit base lower latch can be removed from the installation board)

2 Push up the indoor unit upward. So the indoor unit will

be removed from the installation board.

¡Remove it with hand or

pliers.

¡Insert the drain cap which was removed at

proce-dure “2” securely using a hexagonal wrench, etc. Note: Be careful that if it is not inserted securely, water leakage may occur.

¡Insert the drain hose

securely, makingit rotate. Note: Be careful that if it is not inserted securely, water leakage may occur.

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

Installation Steps

1 Pass the pipe through the hole

in the wall, and hook the upper part of the indoor unit to the installation board.

2 Gently push the lower part to

secure the unit.

The marked portion of the Indoor unit bese lower latch

Lid

5.3 Installation of outdoor unit

(1) Installation of outdoor unit

(a) Make sure that the unit is stable in installation. Fix the unit to stable base. (b) When installing the unit at a higher place or where it could be toppled by strong winds, secure the unit firmly with foundation

bolts, wire, etc. (c) Perform wiring, making wire terminal numbers conform to terminal numbers of indoor nuit terminal block. (d) Connect using ground screw located near

mark.

(e) In areas where the temperatures drop below 0ºC for serveral continuous days, do not install a drain elbow.

(Water dischage could stop due to freezing.)

• Specified torquing value: Liquid side (ø6.35) : 14~18N·m (1.4~1.8kgf·m) Gas side (ø9.52) : 34~42N·m (3.4~4.2kgf·m) Gas side (ø12.7) : 49~61N·m (4.9~6.1kgf·m)

• Use one more spanner to fix the valve.

¡ 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 (ø6.35): 9.1 mm Gas side (ø9.52): 13.2 mm (ø12.7): 16.6 mm

Press

Remove

(Do not turn)

Spanner for fixing

the piping)

Torque wrench

• Specified torquing value: Liquid side (ø6.35) : 14~18N·m (1.4~1.8kgf·m) Gas side (ø9.52) : 34~42N·m (3.4~4.2kgf·m) Gas side (ø12.7) : 49~61N·m (4.9~6.1kgf·m)

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

5.4 Connection of refrigerant pipings

(1) Preparation

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

(a) Indoor unit side

(b) Outdoor unit side

(2) Connection of refrigerant piping

(a) Indoor unit side

• Connect firmly gas and liquid side pipings by Torque wrench.

(b) Outdoor unit side

• Connect firmly gas and liquid side pipings by Torque wrench.

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)

(3) Air purge

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

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

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).

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

(e) Detach the charge hoses.

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

¡ 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

(4) Insulation of connecting portion

(a) 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.

(b) 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.

5.5 Test run

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

(2) When conducting trial run set the remote control 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.

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

(4) Make sure that drain flows properly.

(5) Standard operation data

Model

SRK20ZG-S SRK25ZG-S SRK35ZG-S SRK50ZG-S

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 4.9/4.7/4.5 7.6/7.3/7.0

Running current (A)

Heating

3.0/2.9/2.8 4.5/4.3/4.1 5.3/5.1/4.9 7.9/7.5/7.2

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)

(b) When manipulating the remote control mounted on a

wall:

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

signal is audible) before mounting.

Notes (1) The remote control 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

7 m or less

Wireless remote control

7 m or less

Remote control available in this area.

Receiver

or less

5.6 Precautions for wireless remote control installation and operation

(1) Wireless remote control covers the following distances:

(a) When operating facing the air conditioner:

or less

If the distances exceed the area indicated above, be sure to check

the receiver status.

6 MAINTENANCE DATA

6.1 Troubleshooting procedures for electrical equipment

(1) 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.

(2) 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?

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

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 (4).

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 control?

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 control 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

(4) 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 34.

See pages 35~38.

(5) 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 control 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 control for 3 minutes after operation stops.

(2)The wired remote control is optional parts.

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.)

• Broken heat exchanger sensor wire, poor connector connection

• Broken room temperature sensor wire, poor connector connection

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.)

• Defective fan motor, poor connector connection

Indoor fan motor error

1 time

flash

2 time

flash

6 time

flash

When an outdoor 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

1 time

flash

Keeps

flashing

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

2 time

flash

Keeps

flashing

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

4 time

flash

Keeps

flashing

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

1 time

flash

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 compressor wire

• Broken discharge pipe sensor wire, poor connector connection

• Compressor blockage

Trouble of outdoor unit

2 time

flash

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

• Gas shortage, defective discharge pipe sensor, closed service valve

Over heat of compressor

5 time

flash

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).

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

Error of signal transmission

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

2 time

flash

2 time

flash

When the outdoor unit’s fan motor sped 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

7 time

flash

Indoor unit display panel

Description

of trouble

Cause Display (flashing) condition

RUN

light

TIMER

light

When the inverter command speed is 20 rps or less and the current safe has operated. (the compressor stops)

• Overload operation

• Overcharge

• Compressor locking

Current safe stop

3 time

flash

E 6

E 7

E 16

E 38

E 37

E 39

E 42

E 59

E 36

E 5

E 60

E 48

The wired remote control wire Y is open. The wired remote control wires X and Y are reversely connected. Noise is penetrating the wired remote control lines. The wired remote control or indoor control PCB is faulty. (The communications circuit is faulty.)

• Broken wired remote control wire, defective indoor unit boards

Error of wired remote control wiring

—

E 1

E 58ON

• Broken power transistor

Power transistor error

5 time

flash

E 41ON

Wired remote control display

(6) 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.

(a) 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 (b) 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 control 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.

(b) 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 control

(*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 37 and 38.)

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

(*4)

. (See page 36.)

*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 control’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.

When the optional wired remote control is used:

When the service mode is effective and the optional wired remote control is used, the signal from the wired remote control won't be received. Use the self diagnostic function with the wireless remote control.

*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 control’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 control 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 control 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 control 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 control 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 control 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 control 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

(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

4 time

flash

5 time

flash

6 time

flash

7 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 the power supply voltage drops during operation.

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)

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

-- -

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.

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.

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.

3 time

flash

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

Abnormal stop 3 times in 20 minutes.

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

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

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

110ºC(50Z) 125ºC(20~35Z)

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 insufficient. 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.

5 time

flash

Note (1) The number of flashes when in the Service Mode do not include the 1.5 second period when the lights 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

• 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).

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.

(d) Remote control 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

FAN

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 control becomes as follows.

Remote control 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

(e) 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)

(f) 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 control 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 control 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 control 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 control 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 control 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 control 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

(7) Inspection procedures corresponding to detail of trouble

Sensor error

[Broken sensor wire, connector poor connection]

(Shortcircuit)

(Broken wire)

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)

40506

–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

Indoor fan motor error

[Defective fan motor, connector poor connection, defective PCB]

Is connector connection good?

YES

Is the output of the indoor unit’s printed circuit board normal?

Normal

YES

Correct connector connection

Is DC fan motor resistance value good?

Replace indoor PCB

Replace indoor fan motor

Notes (1) See pages 47 for the DC fan motor and indoor unit circuit

board check procedure.

(2) After making sure the DC fan motor and indoor unit circuit

board are normal, connect the connectors and confirm that the fan motor is turning. (If power is turned on while one or the other is broken down, it could cause the other to break down also.)

* Disconnect the fan motor

connector, then investigate the DC fan motor and indoor unit circuit board separately.

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.

Trouble of outdoor unit

[Compressor malfunction of insufficient gas (refrigerant)]

Does compressor operation? Is capacitor for compressor normal?

Replace compressor.

Replace heat exchanger sensor

Insufficient gas

Is refrigerant amount normal?

Is heat exchanger sensor resistance value good?

Is connector for compressor connection good?

Does trouble persist after charging gas?

Clogged capillary tube or strainer, defective EEV, etc.

Replace capacitor for compressor.

Correct connection

Check if there are any places where gas is leaking

YES

NO NO

YES

Current safe stop

[Overload operation, compressor lock, overcharge]

Secure space for inlet and outlet.

Discharge refrigerant.

Is refrigerant charge quantity adequate?

Is outdoor ventilation condition good?

Inspect compressor.

Defective inverter

YES

Over heat of compressor

[Gas shortage, defective discharge pipe sensor]

Is discharge pipe sensor resistance value good?

(page 43)

Is sufficient quantity of refrigerant circulated?

Defective outdoor unit PCB

YES

Check if there are any places where gas is leaking.

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

Does trouble persist after charging gas?

Clogged capillary tube or strainer, defective EEV, etc.

Error of signal transmission

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

Does error persist after power reset?

Are the lines connecting the indoor and outdoor units connected normally?

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.

Defective outdoor unit PCB

Check crossover wires.

Outdoor fan motor error

[Defective fan motor, connector poor connection, defective PCB]

Is connector connection good?

YES

Is the output of the outdoor unit’s printed circuit board normal?

Normal

YES

Correct connector connection

Is DC fan motor resistance value good?

Replace outdoor PCB

Replace outdoor fan motor

* Disconnect the fan motor

connector, then investigate the DC fan motor and outdoor unit circuit board separately.

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.

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

(8) Phenomenon observed after shortcircuit, wire breakage on sensor

(a) Indoor unit

Phenomenon

Sensor

Shortcircuit Broken wire Cooling Release of continuous compressor operation command

Heating Continuous compressor operation command is not released.

Cooling System can be operated normally.

Heating High pressure control mode (Inverter stop command)

Humidity Sensor

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

Note (1) The humidity sensor is included in the 35 and 50 type only.

Operation mode

Heat exchanger sensor

Outdoor air temperature sensor

Discharge pipe sensor

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

(9) Checking the indoor electrical equipment

(a) Indoor unit circuit board check procedure

(b) Outdoor unit

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

System can be operated normally.

Defrosting is performed for 10 minutes at approx. 45 minutes.

System can be operated normally.

Defrosting is performed for 10 minutes at approx. 45 minutes.

Compressor stop

Is there voltage between terminal blocks 1 and 2 ? (AC 220/230/240 V)

Indoor electrical components are normal.

Is the voltage between terminal blocks 2 and 3 oscillating between DC 0 and 12V?

Inspect power source for outdoor unit.

Replace fuse.

Replace printed circuit board.

Is the fuse burnt out? (3.15 A)

YES

(b) Indoor unit fan motor check procedure

This is a diagnostic procedure for determining if the indoor unit’s fan motor or the circuit board is broken down.

1) Indoor unit printed circuit board output check

a) Turn off the power.

b) Remove the front panel, then disconnect the fan motor lead wire connector.

c) Turn on the power. If the unit operates when the ON/OFF button is pressed, if trouble is detected after the voltages in

the following figure are output for approximately 30 seconds, it means that the circuit board is normal and the fan

motor is broken down.

If the voltages in the following figure are not output at connector pins No. 1, 4 and 5, the indoor unit’s circuit

board has failed and the fan motor is normal.

2) DC Fan motor resistance check

Notes (1) Remove the fan motor and measure it without power connected to it.

Notes (2) If the measured value is below the value when the motor is normal, it means

that the fan motor is faulty.

123456

DC15V

Indoor unit circuit board

DC 308~336V

DC several V (4~6 V)

CNU

(–)

GND

Blue

Yellow

White

Black

Red

Measuring Point Resistance when Normal

1 – 3 (Red – Black)

25 MΩ or higher

4 – 3 (White – Black) 30 kΩ or higher

(10) How to make sure of remote control

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

(1)

Is remote

control normal?

YES

Again pushing operating switch

Operating the unit?

Does unit ON/OFF button operates?

Operating the unit.

YES

Remote control defects

Abnormality is not found.

Replace the display.

Control problem on main unit

Is the unit

operable with remote

control?

Defective remote control

YES

Normal

–

2/N

250V 15A

R.IN

C-2

S.IN

POWER

TRANSISTOR

UVW

CND

CNA

FMO

CNB

20SEEV

CNE

◆ Inspection of resistance value of sensor

Remove the connector and check the resistance value.

See the section of sensor characteristics on page 43.

◆ 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 sensor

Remove the connector and check the resistance value.

See the section of sensor characteristics on page 43.

◆ 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

N_1P_1

N_1

P_1

DC-NDC-P

PWB3 (CAPACITOR)

CNG

PWB1 (MAIN )

PWB2 (POWER )

EEV

Th4 Th5 Th6

CNT CNJCNDCNB

FMo

20S

F(250V 15A)

L-1

AC.N

AC.L

AC.N

AC.L

AF_L2

AF_L1

CNHCNG

Y/GN

CNI

2/N

N-1

CNO.1

6.2 Servicing

(1) 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

(a) 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.

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

(2) Refrigerant charge

(a) 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.

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

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

amount.

(d) 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.

(e) 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.

(f) 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.

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

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

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

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

ence between return air and supply 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.

7 INTERFACE KIT (OPTIONAL PARTS)

7.1 Applicable model

Name Type

Interface kit SC-BIK-E

SRK20ZG-S, SRK25ZG-S SRK35ZG-S, SRK50ZG-S

7.2 List of connectable devices

Name Type

Wired remote control RC-E1R

Super link adapter SC-AD-ER

Center console SC-SLA1-ER, SC-SLA2A-ER, SC-SLA3-ER

7.3 Exterior dimensions

120

135 1300

18.2 83.5

7.4 Circuit board component layout

Indoor unit connection terminals

Jumper wire

Address setting rotary switch

Wired remote control and Super link adapter terminal block

CNT terminal

7.5 System configuration

q Wired remote control system

e Remote operation

w Control of multiple units with a remote control

Room air conditinoer

Interface kit

SC-BIK-E

Wired remote control

RC-E1R

• Wired remote control (RC-E1R)

• Interface kit (SC-BIK-E)

Multiple units (16units~144units) can be cotrolled with a single remote control.

Using the wired remote control system, users can run and stop the unit, switch operations, adjust the temperature, fan speed and air flow direction (up or down), and control timer operation .

Use a wired remote control for retirement homes, school classrooms and similar locations.

Multiple units (16units~144units) can be cotrolled with a single remote control.

• Using the remote start/stop switch timer, etc., the unit can be started and stopped by inputting level or by inputting pulses.

• The run signal, heating signal, compressor ON signal and check signal can be received by nonvoltage contacts.

For hotels and similar facilities with multiple units installed, the remote control is used to turn multiple air conditioning units ON or OFF.

For users who want to exercise central control together with a package air conditioning system, such as an office.

Remote start and stop and remote monitoring.

• Interface kit (SC-BIK-E)

• Super link adapter (SC-AD-ER)

• Center console (SC-SLA1-ER, SC-SLA2A-ER, SC-SLA3-ER)

• Wired remote control (RC-E1R)

※1 The wireless remote control

supplied with one unit cannot be used.

If it is necessary to control

each room separately, use the wired remote control.

• Inrterface kit (SC-BIK-E)

• Remote ON/OFF monitor kit (Customer arrangements)

Center console

SC-AD-ER

Center console

SC-AD-ER SC-AD-ER SC-AD-ER SC-AD-ER SC-AD-ER

SC-AD-ER SC-AD-ER SC-AD-ER

Super link adapter

SC-BIK-E SC-BIK-E SC-BIK-E SC-BIK-E

SC-BIK-E

Interface kit

Signal wire

(2m supplied)

Room air conditinoer

Interface kit

Signal wire

(2m supplied)

RCE1R

RC-

E1R

RCE1R

Wired remote control

※1

Wired remote control

※1

Wired remote control

Packaged air conditioner

SC-BIK-E

Remote operation

Common

Operation output

Heating output

Compressor operation output

Malfunction output

Remote operation input

Power supply DC 12/24V or AC 220 ~ 240V

System configuration Control contents Use Parts used

7.6 Installation of interface kit

Accessories included in package

Part name

Quantity

Please check to make sure all the accessories have been included.

Indoor unit connection cable (total cable length: 2 m)

Wood screws (for mounting the interface: ø4 × 25)

Tapping screws (for mounting the clamp and interface mounting bracket)

Interface mounting bracket

Clamp (for the indoor unit)

Connecting the interface and indoor unit

q Remove the air inlet panel, lid and front panel.

w Take the indoor control board out of the control box.

e There are five terminals (respectively marked with CNA,

CND, CNI, CNK, and CNL) for the indoor control boad. In connecting an interface, connect to the respective terminals securely with the connection harness supplied with an optional “Interface connection kit SC-BIK-E”.

r House the indoor unit control board in the control box.

t Fasten the connection harness onto the indoor control box

with clamp supplied with the kit.

y Reinstall the front panel, lid and air inlet panel.

Clamp

Connection terminal

o Fasten with the clamp

Remove the upper case

Install the indoor unit connection cables

XYZXYZ

u Remove the upper case of the interface.

• Take out the 2 screws in the interface case.

i Install the indoor unit’s connection cables in the interface.

• Connect the connectors of the indoor unit connection cables to the connectors on the interface’s circuit board. (4 places)

o Fasten the indoor unit connection cables using clamps.

• Cables can be brought in from the top or from the back.

• Use side cutters, etc. to cut out the thin knockouts used to run wires into the case.

Connecting the interface and the indoor unit

Names of each part of the interface unit

Jumpers

Indoor unit connection terminals

Clamp for fastening indoor unit connection cables

Interface board

CNT terminal

Clamp for fastening the wired remote control connection cable

* Either the super link adapter cable or the wired remote control connection cable can be connected.

Address setting rotary switch

Super link adapter terminal block

Clamp for fastening the super link adapter connection cable

Wired remote control

terminal block

Z Y X

• The maximum total length should be 600 m.

• Be sure to use shielded cable. (Type: 0.3 mm

× 3 cores)

• If the extended length exceeds 100m, change the wire size to the following sizes. However, inside the remote control case, the maximum wire size should be 0.5 mm

or less. Change the wire size in accordance with the wires connected near the outside. Within 100 ~ 200 m ······ 0.5 mm

× 3 cores

Within 300 m ···· 0.75 mm

× 3 cores

Within 400 m ···· 1.25 mm

× 3 cores

Within 600 m ······ 2.0 mm

× 3 cores

Multiple units (up to 16 units) can be controlled with a single remote control.

1 For group control, install connection cables between the unit and package air conditioner indoor units.

• Connect the cables to terminals X, Y and Z in the interface unit. Each terminal has polarity, so be sure to connect wires to the

corresponding terminals at each end.

• Use cables with a size of 0.5 mm

or larger. (cables that are large enough to endure the

routing required)

• Keep the total length of connection cables and remote control wiring to within 600 m.

2 Set the address in each unit.

Set the address of using the rotary switch on the circuit board inside each unit. (“0” ~ “F”)

Set the addresses in each group so that there is no overlapping of addresses.

After turning on the power, the indoor unit’s address is displayed when the Air

Conditioner No. button on the remote control is pressed, so check if the indoor unit

addresses is displayed in the remote control’s display when the and buttons

are pressed to select each unit.

Wired remote control connection

䢇 Control of multiple units with a remote control

Cautions when extending the connection cable length

Cut jumper wire “J2” on the circuit board.

Caution: Both the wired remote control and the wireless remote control supplied with the

indoor unit cannot be used together.

Strip off the sheath material from the connection cable wires inside the wired remote control case.

The length of wire with the sheathing removed should be as shown below for each wire.

Black: 195 mm White: 205 mm Red: 215 mm

Fasten the connection cables with clamps.3

Connect the interface and remote control.

The terminals have polarity, so be sure to connect the wires to the corresponding terminal on each end.

Be sure to strip off the only the proper length of sheath material from each connection cable in the interface unit.

Please see the instructions in the wired remote control’s manual concerning connections to the wired remote control.

Jumper wire (J2)

Rotary switch

Sheath material

removal length

Remote control terminal block

Connection cable

0.3 mm

(recommended)

~ 0.5 mm

(maximum)

Wired terminal block

Interface side

Z terminal: black wire

Y terminal: white wire

X terminal: red wire

No.

Z Y X

See the super link adapter’s manual concerning connections to the super link adapter.

1Cut jumper wire (J2) on the circuit board.

Caution: This device cannot be used together with the wireless remote

control which is supplied with the indoor unit.

2Connections between the interface and super link adapter

3Fasten the super link adapter cable with clamps.

CNT connector functions

Super link adapter connection

Jumper wire (J2)

Super link adapter

Super link adapter terminal block

Interface side

Within 200 m 0.5 mm

× 3 cores

Within 300 m 0.75 mm

× 3 cores

Within 400 m 1.25 mm

× 3 cores

Within 600 m 2.0 mm

× 3 cores

Shielded wire

Vinyl cabtyre round cord

Vinyl cabtyre round cable

Vinyl insulated wirevinyl sheathed cable for control

Z terminal: black wire

Y terminal: white wire

X terminal: red wire

Names of recommended signal wires

Turning the contacts ON/OFF, the off/running status of the air conditioner can be monitored from the External control unit (remote display).

1Connect a locally procured remote control

unit to the CNT terminal.

2In case of the pulse input, cut off the

jumper wire “J1” on the main unit PCB.

3When setting at Operation

permission/prohibition Mode, cut off the jumper wire “J3”.

䢇 X

R1~4

are for the DC 12V relay

䢇 XR5 is a DC 12/24 or AC 220~240V relay 䢇 CNT connector (local) maker, model

Pulse input

(J1 cut)

Pulse input

(J1 cut)

Input

Output

Operation output

Heating output

Malfunction output

ON output (XR1 = ON) during air conditioner operation

ON output (X

R2 = ON) during heating operation

ON output (X

R3 = ON) during compressor operation

ON output (X

R4 = ON) during an abnormal stop

Content

Jumper wire (J3)

In the operation permited/prohibited mode, remote control operations are allowed only when the input is turned ON.

CNT connector

0.3 mm2 (Keep the distance between the relay and the CNT terminal within 2 m.)

Common

Power supply DC 12/24 V or AC 220~240V

Output 1

Output 2

Output 3

Output 4

Input

Jumper wire (J1)

Connector

Terminals

Molex

5264-06

5263T

Air conditioner ON/OFF is inverted depending on the pulse signal at OFF ON.

Output 1

Output 2

Output 3

Output 4

Compressor operation output

Remote control input

Input

Level input (At shipment)

External control

(At shipment)

External control

(At shipment)

Operation permission /prohibition (J3 cut)

OFFONON

OFF

Air conditioner OFF Air conditioner OFF

OFFONON

OFF

Air conditioner ON Air conditioner OFF

Install the interface so that the connection cable can reach the indoor unit (approximately 1.3 m). If the connection cable is extended, operation will be faulty, so do not extend the cable. Fasten the unit to a wall, pillar or similar location.

Use a side cutter or similar tool to open the thin knockouts in the case for running wires.

1Mount the lower case of the interface

unit to a flat surface using the wood screws supplied with the unit.

2Mount the upper case.

Recess the electrical box (procured locally) and each connection cable inside the wall.

Fasten the lower case of the interface unit to the electrical box using screws (M4 screws, procured locally).

Mount the upper case to the lower case.

1Mount the interface unit’s upper case. 2Mount the mounting bracket to the

interface unit using the tapping screws supplied with the unit.

3Mount the mounting bracket to a wall

surface, etc. using the wood screws provided.

Interface installation

If the unit is mounted directly to a wall

Recessing the unit in a wall

Mounting with the mounting bracket

3 Mount the bracket on a wall or pillar

(2 wood screws)

3 Mount the upper case

Connection cable

Wiring inlet

Electrical box (procured locally)

Fasten it to the electrical box. 2 M4 screws (procured locally)

1 Fasten it to a wall or pillar (2 wood screws)

1 Recess the electrical box and

connection cables

2 Mount the upper case

2 Mount the mounting bracket

on the interface unit. (3 tapping screws)

7.7 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.

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, 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.

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.)

Temperature setting switches

These switches are used to set

the temperature of the room.

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】

Cannot be used.

【CHECK switch】

Cannot be used.

【TEST switch】

Cannot be used.

LOUVER switch

This switch is used to operate/stop the swing louver. (Up/down swing only)

【Vent Indicator】

Cannot be used.

【VENT switch】

Cannot be used.

【RESET switch】

Cannot be used.

* If you press 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【 】.

7) Use a cord clamp to attach the remote control cord to the wall.

8) Set the functions according to the types of indoor unit. (Refer to 61 page).

(b) Recessed fitting

1) The Electrical box and remote control (shield wire must be use in case of extension) are first embedded.

(1) Selection of installation location

Avoid the following locations (a) Direct sunlight. (b) Close to heating device. (c) Highly humid or water splashing area. (d) Uneven surface.

(2) Installation procedure

(a) Exposed fiting

1) Open the remote control cover and unscrew the screw located beneath the switch.

2) Open the remote control case.

• Put a screw driver (flat-head) into the concavity

made on the upper part of a remote control and twist it lightly to open the casing.

3) The cord of a remote control can only be pulled out in the upward direction.

• Cut off with nippers or a knife a thin walled

part made on the upper end of the rmote control bottom casing, and then remove burrs with a file or the like.

4) Fix the remote control bottom casing onto a wall with two wood screws supplied as accessories.

5) Connect the remote control to the terminal block. Connect the terminals of the remote control to the indoor unit with the same numbers. Because the terminal block has polarity, the device becomes inoperative if there are wrong connections.

Terminals: xRed wire, YWhite wire, ZBlack wire

• Use a cord of 0.3mm2 (recommended) -

0.5mm

(maximum) for a remote control cord. Remove a sheathe of the remote control cord for the section laid within the remote control casing.

Thin walled part

Upper

Lower

Lower case

Upper

Lower

Lower case

Upper

Lower

Board

Wiring

XYZ

Red White Black

Upper case

Remote control cord

Electrical box

Not included

Upper

Lower

Cable outlet

Lower case

Upper

Lower

Cable outlet

Cut off with a knife or the like thin walled parts

intended for screw holes, and then fix it with

screws.

Two M4 screws (Head diameter must be 8mm) (not included)

(This side is not grounded)

Earth wiring

Remote control switch

Remote control cord (Shielded wire)

Indoor unit

Length of the section where a sheath is removed

2) Remote the upper case to the remote control.

3) Attach the lower case to the Electricl box with two M4 screws. (Head diameter must be 8 mm). Choose either of the following two positions in fixing it with screws.

4) Connect the remote control cord to the remote control. Refer to [Exposed fitting].

5) Installation work is completed by replacing the top casing onto the bottom casing as before.

6) Set the function switch according to the type of the indoor unit. (Refer to 61 page)

Precation in Extending the Remote control cord Maximum total extension 600m. The cord should be a shielded wire.

● For all types : 0.3mm

× 3 cores

Note (1) Use cables up to 0.5mm2 (maximum) for those laid inside

the remote control unit casing and connect to a different size cable at a vicinity point outside the remote control unit, if necessary.

100.Within 100-200m…………0.55 mm2 × 3 cores

Within 300m…………0.75 mm

× 3 cores

Within 400m…………1.25 mm

× 3 cores

Within 600m…………2.05 mm

× 3 cores

●

The shielded wire should be grounded at one side only.

7.8

Installation of wired remote control

(Optional parts)

Black: 195mm, White: 205mm, Red: 125mm

6) Replace the top casing as before.

Screw

The length of each wire that should be left after a sheath is removed is as follows:

7.9 Setting functions using the wired remote control

(1) The default settings of this unit's functions are as follows: If you want to charge a setting, follow the procedure found in the

installation manual and set to your desired setting.

For the method of setting, please refer to the installation manual of a remote control unit.

1 Remote control unit functions ( FUNCTION

)

2 Indoor unit functions (I/U FUNCTION

)

【01】

【09】

【11】

【18】

Default

setting

GRILLE SET

AUTO RUN SET

TEMP S/W

MODE S/W

ON/OFF S/W

FANSPEED S/W

LOUVER S/W

TIMER S/W

SENSOR S/W

VENTI SET

TEMP RANGE SET

I/U FAN SPEED

MODEL TYPE

EXTERNAL CONTROL SET

ERROR DISP SET

POSITION

˚C/˚F SET

INVALID

50Hz AREA ONLY

60Hz AREA ONLY

AUTO RUN ON

AUTO RUN OFF

VALID

INVALID

VALID

INVALID

VALID

INVALID

VALID

INVALID

VALID

INVALID

VALID

INVALID

SENSOR OFF (Invalid)

SENSOR ON (Valid)

INVALID

VALID

NO VENTI

VENTI LINK SET

NO VENTI LINK

DISP CHANGE

NO DISP CHANGE

3 FAN SPEED

2 FAN SPEED

1 FAN SPEED

HEAT PUMP

COOLING ONLY

INDIVIDUAL OPERATION

SAME OPERATION FOR ALL UNITS

ERROR DISP

NO ERROR DISP

FIX (1 OF 4) (4 position stop)

IN MOTION (Free stop)

˚C

˚F

Grille lift panel setting

Remote control sensor setting

Indoor unit fan speed setting

ON/OFF

Louver control setting

【01】

【03】

【07】

【08】

【09】

【10】

Function

number A

Default

setting

Hi CEILING SET

FILTER SIGN SET

POSITION

EXTERNAL INPUT SET

ROOM TEMP OFFSET

FAN CONTROL

FREEZE PREVENT TEMP

FREEZE PREVENT CONTROL

(Heating room temperature offset)

Heating fan control

Louver control setting

STANDARD (Mild mode)

Hi CEILING 1

(Powerful mode)

NO DISPLAY

AFTER 180H

AFTER 600H

AFTER 1000H

1000H→STOP

FIX (1 OF 4) (4 positiion stop)

IN MOTION (Free stop)

LEVEL INPUT

PULSE INPUT

NORMAL OPERATION

VALID

NORMAL OPERATION

TEMP SHIFT +3˚C

LOW FAN

STOP→LOW FAN (Intermittent operation)

TEMP Hi

TEMP Lo

FAN CONTROL ON

FAN CONTROL OFF

Function description

Setting

Function

number A

Function description

Setting

()

POWER FAILURE COMPENSATION SET

()

OPERATION PERMISSION PROHIBITED

Notes(1)

(2)

(3)

Setting marked with [] are the default setting. Setting marked with [

] are those that are set automatically according to an indoor unit or an outdoor unit connected. Please check default settings with the indoor unit's installation manual. The SRK model cannot set the items described in【】in the function number A.

Notes(1)

(2)

(3)

(4)

Setting marked with [] are the default setting. Setting marked with [

] are those that are set automatically according to an indoor unit or an outdoor unit connected. Please check default settings with the indoor unit's installation manual. When Item 17 : “ POSITION” is changed, please also change Item 04 “ POSITION” setting found in “Indoor unit functions”. The SRK model cannot set the items described in【】in the function number A.

(2) Function setting method

(a) Stop the air conditioner

(b) Press the SET and MODE buttons simultaneously

for 3 seconds or longer.

The screen display will be switched as follows:

“

SELECT ITEM”

“

SET"

“FUNCTION SET

”

The unit will enter the function setting mode. The

screen display will charge to “

FUNCTION

”.

(d) Check which category your desired setting belongs to, “

FUNCTION (Remote control unit function)” or “I/U

FUNCTION " (Indoor unit function).

(e) Press either

or button.

Select either “ FUNCTION

” or “I/U FUNCTION

”.

(f) Press the SET button.

When “ FUNCTION ” is selected.

1 “DATA LOADING” (blinking)

“

FUNCTION”

“01 GRILLE SET” (Function number: A, Function description: B)

The screen display will be switched like this.

2 Press either

or button.

“Function number: A, Function description: B “from the list of remote control unit functions will be displayed one by

one. Select a desired function.

3 Press the SET button.

The screen display will be switched as follows:

“

SETTING”

“Setting: C” (ex. “AUTO RUN ON”)

4 Press either

or button.

A list of “Settings: C” will be displayed one by one. Select your desired setting.

5 Press the SET button.

The selected setting is displayed

for 2 seconds, then followed by

“SET COMPLETE” and the

function setting process is com-

pleted.

Then the screen display will be

swiched to “Function number: A, Function description: B,” s o

if you want to continue to set an-

other function, repeat the steps as

explained above.

To finish the function setting pro-

cess, please proceed to Step (g).

Operating guide message Function description: B , Settting: C

Function number: A

Previous screen buttonIndoor unit selector button

Confirm Button

Finish Button

Selector button

Start Button

AUTO RUN SET

FUNCTION SET

FUNCTION

I/U FUNCTION

AUTO RUN SET

AUTO RUN ON

AUTO RUN ON AUTO RUN OFF

SET COMPLETE

Function number: A

Function description: B

* When “ AUTO RUN SET ” is selected.

Setting: C

When “I/U FUNCTION ” is selected.

1 The screen display will be switched as follows:

“

I/U SELECT” “

SET”

“I/U No.00” (blinking)

2 Press either

or button.

Select the indoor unit number that you want to change settings. If only one indoor unit is connected, the indoor unit number will not charge, so please proceed to Step 3. If “ALL I/U

” is selected while indoor group control is in effect, you can set all units to the same settings.

3 Press the SET button.

Indoor unit number indication will change from blinking to lit continuously, The screen display will be switched as follows: "DATA LOADING" (blinking for about 2 to 23 seconds)

“ FUNCTION” “05 EXTERNAL INPUT SET”

(Function number: A, Function description: B)

4 Press either

or button.

“Function number: A, Function description: B” from the list of indoor unit functions will be displayed one by one. Select a desired function.

5 Press the SET button.

The screen display will be switched as follows: “

SETTING” “Setting: C” (ex. “LEVEL INPUT”)

6 Press either

or button.

A list “Setting: C” will be displayed one by one. Select your desired setting.

7 Press the SET button.

The selected setting is displayed for 2 seconds, then followed by “SET COMPLETE” and the function setting process is completed. Then the screen display will be switched to “Function number: A, Function description: B” so if you want to continue to set another function, repeat the stepa as explained above. To finish the function setting process, please proceed to Step 8.

8 Press AIR CON No. button.

The screen display will go back to the indoor unit selection screen (ex. “ I/U No.00”).

(g) Press the ON/OFF button.

This ends a function setting process. Even if a function setting process is not completed, this ends the process. Please note that any setting that is not completed will become void.

¡ Pressing the RESET button during a function setting process will allow you to go back the previous

step. Please note that any setting that is not completed will become void.

¡ Method of checking the current setting

While following the above mentioned step, the setting that appears when the SET button is pressed for each “Function number: A, Function description: B” is the current setting “Stting: C”. (When "ALL I/U

" is selected, the setting of

the indoor unit with the lowest number is displayed)

¡ Settings are stored in the controller and not lost even a power outage occurs.

I/U No.00

* When “

EXTERNAL INPUT SET” is selected.

Function number: A

Function description: B

EXTERNAL INPUT SET

Settings: C

LEVEL INPUT

(3) Changing the remote control set temperature range

(a) It is possible to change the set temperature range using the remote control.

1) The upper and lower set temperature limits can be set from the remote control. Upper limit value setting: Effective during heating. The temperature can be set within a range of 20~30ºC. Lower limit value setting: Effective when running in modes other than the heating mode (AUTO, COOL, FAN, DRY): The temperature can be set within a range of 18~26ºC.

2) If the upper and lower limits are set using this function, the following controls are active.

(b) When and BTEMP RANGE SET under “

FUNCTION” the function setting mode is DISP CHANGE

1) If you are setting the upper limit, q If a temperature that is greater than the upper limit during heating is set from the remote control.

The unit runs for 30 minutes at the set temperature, then it automatically transmits the upper limit temperature. The display on the remote control also approaches that temperature.

w During heating, if the upper limit value is set at a temperature below the upper limit value:

The set temperature is transmitted.

2) If the lower limit is set q If a temperature that is lower than the lower limit value is set from the remote control. When running in an operation

mode other than the heating mode: the unit runs at the set temperature for 30 minutes, then it automatically transmits the lower limit temperature.

w If a temperature that is higher than the lower limit value is set when running in a mode other than the heating mode:

It transmits the set temperature.

FUNCTION” the function setting mode is NO DISP CHANGE.

1) If the upper limit is set q During heating, if a temperature that is higher than the upper limit is set from the remote control:

The upper limit value is transmitted. However, the remote control display does not approach the upper limit value, but remains on the set temperature.

w During heating, if the temperature is set at a value lower than the upper limit value:

The set temperature is transmitted.

2) If the lower limit is set q When in an operating mode other than the heating mode, if a temperature that is lower than the lower limit value is

set from the remote control: The lower limit value is transmitted. However, the remote control display does not approach the lower limit value, but remains on the set temperature.

w When in an operating mode other than the heating mode, if a temperature that is higher than the lower limit value is set:

The set temperature is transmitted.

(d) Setting the upper and lower limit values

1) Stop the air conditioner, then press the SET and MODE buttons simultaneously for 3 seconds or longer. If you press “ SELECT ITEM” “

SET”

“FUNCTION SET

” the display changes.

2) Press the

button, then change the “TEMP RANGE

“ display.

3) Press the SET button and enter the temperature range setting mode.

4) Using the

buttons, select the “Hi LIMIT SET

” or “Lo LIMIT SET

,” then fix it by pressing SET.

5) If you selected “Hi LIMIT SET,” (enabled during heating) q “

SET UP” “Hi LIMIT 28°C ” (blinking) is displayed.

w Using the “

” temperature setting buttons, select the upper limit value. Display Example: “Hi LIMIT 26ºC

“ (blinking)

e Press the SET button to fix the setting. Display example: “Hi LIMIT 26ºC” (lights up for 2 seconds)

After the fixed upper limit value lights up for 2 seconds, the display returns to the “Hi LIMIT SET

” display in

item d).

6) If “Lo LIMIT SET

” was selected (enabled during COOL, DRY and FAN)

q “

SET UP” “Lo LIMIT 20°C

” (blinking) is displayed.

w Using the

temperature setting buttons, select the lower limit. Display example: “Lo LIMIT 24ºC

” (blinking)

e Press the SET button to fix the setting. Display example: “Lo LIMIT 24ºC” (lights up for 2 seconds)

After the fixed lower limit value lights up for 2 seconds, the display returns to the “Lo LIMIT SET

” display in

item 4).

7) Pressing the ON/OFF button stops the operation. (Operation stops even if the ON/OFF button is pressed during setting, and the stopped state returns. However, if setting is not completed, it is not valid, so use caution.)

S If the RESET button is pressed during setting, the previous setting screen is displayed.

Function No. A

(Example) If the upper limit is set at 28°C

Function Contents B Setting Contents C

TEMP RANGE SET

DISP CHANGE

NO DISP CHANGE

Control Contents

The remote control’s display and sent data upper limit changes to 28°C.

The remote control’s display upper limit remains at 30°C and only the upper limit of the sent data is changed to 28°C.

• If the RESET button is pressed during a setting operation, the display returns to the previously displayed setting screen.

However, settings which have not been fixed become invalid, so exercise caution.

* If “NO DISP CHANGE” is selected in No. 12, “TEMP RANGE SET” of the remote control’s functions, of the function

setting modes, the remote control’s display does not change even if the temperature range has been changed.

7.10 Super link adapter (SC-AD-ER)

(1) Functions

(a) Transmits the settings from the Super link option to the indoor units. (b) Returns the priority indoor unit data in response to a data request from the Super link option. (c) Inspects the error status of connected indoor units and transmits the inspection codes to the Super link option. (d) A maximum of 16 units can be controlled (if in the same operation mode).

(2) Wiring connection diagram

SC-AD-ER

LED-R LED-G

Blue

Red

White

Black

Master/Slave address

Network address [00] ~ [47]

Connection to super link (total length of wires: 1000 m maximum)

0.75 ~ 2.0 mm

2-core

Connection to the terminal block for interface kit (polar) (total length of wires: 600 m maximum)

No. Name ot the recommended signal wire

1 Shielding wire 2 Vinylcabtire round cord 3 Vinyl cabtire round cable 4 Control vinyl insulated, vinyl sheath cable

Master/Slave Address

SW 3-1

ON Master

OFF Slave

Shielding wires:

100 ~ 200 m ................. 0.5 mm

× 3-core wires

~ 300 m ................. 0.75 mm2 × 3-core wires

~ 400 m ................. 1.25 mm2 × 3-core wires

~ 600 m ................. 2.0 mm

× 3-core wires

● Make sure to ground one side only of the shielding wire.

1) Set the super link network address with SW1 (10-position) and SW2 (1-position).

2) Without a remote control (no wired remote control and no wireless remote control), set SC-AD-ER SW3-1 to ON (Master).

Internal/external Crossing

Interface kit (SC-BIK-E)

Wired remote control (RC-E1R)

Network options

Outdoor unit

Indoor unit

Super link adapter (SC-AD-ER)

A B

Basic Connections

(3) Installation

(a) Accessories

Printed circuit board Metal box Metal cover Insulating rubber sheet

Pan head screw Locking support Band Binding band

ø4 × 8r 2 units for fixing the printed circuit board for binding wires, 5 pieces

made of nylon 4 units

(b) Metal box dimension

90 5

100

22.5

2-ø6

1) Secure the installing board to the metal box with the locking supports.

2) The wires are put through a grommet and bound into a bundle with a binding band.

3) Attaching to the outside of a indoor unit.

4) Attaching to the back of a wired remote control.

s In this case, attach the metal cover.

s In this case, attach directly to the

lower case of the wired remote control.

SC-AD-ER Board

Locking support (4 locations)

Binding band

(4) Inspection Displays

Check the green LED and red LED flashing at the SC-AD-ER board.

SC-AD-ER board LED

Red Green

Inspection mode

light off flashing Normal communication

• Open circuit at the wired remote control signal wire (X) or (Z).

light off light off • Short circuit at the wired remote control signal wire. (between X - Z)

• Power source of the indoor wired remote control is out of order.

• Open circuit at the super link signal wire (A) or (B).

1 flashing flashing • Short circuit at the super link signal wire. (between A - B)

• The super link circuit is out of order.

2 flashings flashing • Poor SC-AD-ER board address setting. (setting at No. 48 or 49)

• Open circuit at the wired remote control signal wire (Y).

• Short circuit at the wired remote control signal wire. (between X - Y or between X - Z)

3 flashings flashing

•

In the case of opening without a wired remote control, SC-AD-ER board “Master” setting is not performed.

• The wired remote control signal circuit is out of order.

4 flashings flashing • The address is repeated in the SC-AD-ER board and the indoor unit connected to the link network. E2

flashings flashing • The address is repeated in the SC-AD-ER board and the outdoor unit connected to the link network. E31

Display on the central control device of the network

7.11 Operation permission/prohibition control

The air conditioner operation is controlled by releasing the jumper wire (J3) on the interface kit board and inputting the external

signal into the CnT.

(1) The operation mode is switched over between Permission and Prohibition by releasing the jumper wire (J3) on

the interface kit control board.

(2) When the CnT input is set to ON (Operation permission)

(a) The air conditioner can be operated or stopped by the remote control signal.

(When the "CENTER" mode is set, the operation can be controlled only by the center input.)

(b) 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 interface kit board.

(3) When the CnT input is set to OFF (Prohibition)

(a) The air conditioner cannot be operated or stopped by the remote control signal.

(b) The air conditioner operation is stopped when the CnT input is changed from ON to OFF.

(4) When the operation permission / prohibition mode is set to effective by the indoor function setting selected by

the remote control, the operation depends on (1) 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 (a) 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 (a) above. (Local status)

CnT Input

Unit

(CASE A)

Unit

(CASE B)

OFF

*ON

OFF

Note (1) The ON with the * mark indicates an

ON operation using the remote control

unit switch, etc.

(b) Pulse input

When Jumper wire J1 on the PCB of interface kit 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

Unit

(CASE A)

Unit

(CASE B)

OFF

*ON

7.12 External control (remote display)/control of input signal

(1) External control (remote display) output

Following output connectors (CNT) are provided on the printed circuit board of interface kit.

• Operation output: Power to engage DC 12V relay (provided by the customer) is outputted during operation.

• Heating output: Power to engage DC 12V relay (provided by the customer) is outputted during the heating operation.

• Compressor OPERATION output: Power to engage DC 12V relay (provided by the customer) is outputted while the com-

pressor is operating.

• MALFUNCTION output: When any error occurs, the power to engage DC 12V relay (provided by the customer) is outputted.

(2) Control of input signal

Control of input signal (switch input, timer input) connectors (CNT) are provided on the control circuit board of interface kit.

However, when the operation of air conditioner is under the Center Mode, the remote control by CnT is invalid.

(a) Level input

If the factory settings (Jumper wire J1 EXTERNAL INPUT on the PCB of interface kit) 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

8 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)

8.1 Outline

8.1.1 Refrigerant R410A

(1) 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.

(2) Chemical characteristics of R410A

a) 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.

b) 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.

c) 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

(3) 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 syn-

thetic 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.

8.1.2 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.

8.2 Refrigerant piping installation

8.2.1 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.

(1) 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

(2) Joints

For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants. a) 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 72, 73) 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

b ) 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

8.2.2 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. (1) Flare processing procedures and precautions

a) Cutting the pipe

By means of a pipe cutter, slowly cut the pipe so that it is not deformed.

b) 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.

c) Insertion of flare nut

Socket Socket with

different diameter

90° elbow A type

90° elbow B type

Fitting reducer

Tee

Tee with

different diameter

d) 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

45°~46°



43°~45°

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]

(2) Flare connecting procedures and precautions

a) Make sure that the flare and union portions do not have any scar or dust, etc.

b) Correctly align the processed flare surface with the union axis.

c) 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.

8.2.3 Storage of piping materials

(1) 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 70) 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

(2) Identification

a) Piping set

A copper pipe as piping set for R410A must have a thickness as stated in Table 3 (see on page 70), and, as shown in Tables 5

and 6 (see on page 72), it also differs from R22 in flare processing and flare nut dimensions. So, it is necessary to choose a

piping set suitable for R410A.

b) Copper pipe with insulation

Before using a copper pipe with insulation, make sure that it has a thickness designated for R410A.

c) Bare copper pipe

It is necessary to use a bare copper pipe which has a thickness designated in Table 3 (see on page 70) 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.

(3) Precautions before installation

Observe the following precautions when performing the piping connection at the site.

a) Keep any open ends of pipes be sealed with a cap, etc. until connected with the equipment.

b) 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.

c) 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.

8.2.4 Brazing

(1) 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.

(2) Brazing filler metal

a) 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.

b) Phosphor bronze brazing filler

Phosphor bronze brazing filler is generally used to join copper or copper alloy.

c) 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:

1) 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.

2) 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.

(3) Flux

a) 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.

b) 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.

c) 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, potas-

sium 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).

(4) 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.

a) Attach a reducing valve to the nitrogen gas cylinder

b) Use a copper pipe to direct the nitrogen gas into the piping, and attach a flowmeter to the nitrogen gas cylinder.

c) 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.

d) When the nitrogen gas is flowing, be sure to keep the piping end open.

e) 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.

f) 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).

g) 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.

8.3 Installation, removal and servicing

8.3.1 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 (1) on page 77 and general tools

shown in (2) on page 78.

Fig.5 Prevention of oxidation during brazing

Flow meter

Stop valve

Reducing

valve

Piping

Rubber plug for sealing

From the nitrogen cylinder

Nitrogen gas

(1) Tools exclusive for R410A

a) 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.

b) 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 avail-

able.

c) 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.

d) 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

e) 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.

f) 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.

g) 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.

h) 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.

i) 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.

j) 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.

(2) General tools

a) Vacuum pump

b) Torque wrench

for 1/4: opposite side 17 mm ×

for 3/8: opposite side 22 mm ×

c) Pipe cutter

d) Reamer

e) Screwdriver (+, -)

f) Hacksaw

(3) Applicability of R410A tools to R22 model

g) Hole core drill (ø65 or 70)

h) Hexagonal wrench (opposite side 4 or 5 mm)

i) Spanner, or monkey wrench

j) Tape measure

k) Thermometer

l) Clamping ampere meter

m) Insulation resistance tester (mega tester)

n) Electro circuit tester

o) 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.

8.3.2 New installation work (when using new refrigerant piping)

(1) Air purge by vacuum pump and gas leakage inspection (see Fig. 6)

a) Connect the charge hose to the outdoor unit. 1 b) Connect the charge hose to the vacuum pump adapter. 2

At this time, keep the control valves in the fully closed position. 3 4

c) 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.

d) 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.

e) Fully open the control valves. 3 4 f) Detach the charge hoses. 1 2 g) Tightly secure the cap on the service port. 7

h) After securing the caps on the control valves, check the caps’ periphery if there is any gas leakage. 3 4 7

(2) 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) a) 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.

b) Connect the gauge manifold’s charge hose to the electronic balance’s connecting port. 3 2 c) Open the refrigerant cylinder’s valve, and, after opening the charging valve a little, close it. 1 2 d) 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).

e) 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.

f) 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

g) Quickly remove the charge hose from the service port. 6

When stopped halfway, refrigerant being cycled will be released.

h) 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

8.3.3 Removal (When using new refrigerant piping)

(1) Removing the unit

a) 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.

b) 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.

(2) Installing the unit

a) Proceed with the installation following the steps described in “8.3.2 New installation work”.

8.3.4 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).

8.3.5 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)

8.3.6 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 8.3.2 (2) (pages79, 80).

8.4 Refrigerant recovery

8.4.1 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.

(1) Checks prior to recovering procedures

a) 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

b) Checking the accessories to the refrigerant recovering equipment

(2) Preparations for recovering procedures

a) 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.

b) Preparation of recovering cylinder

A recovering cylinder should be such that it does not go against prohibitions, and is suitable for refrigerant recovered.

c) Connect to the power source

d) 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.

(3) Connection of refrigerant recovering equipment

a) 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.

b) 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

(4) Recovering procedures

a) According to the instructions for handling the refrigerant recovering equipment (described in the attached instruction manual),

operate the equipment to recover refrigerant.

b) 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.

c) 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.

d) 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.

(5) Procedures after recovery

a) Close the valves on the air conditioner subjected to refrigerant recovery, the refrigerant recovering equipment and the recover-

ing cylinder.

b) Detach the recovering cylinder charged with refrigerant and store it as required by law.

8.4.2 Accessories/tools

In order to carry out R410A recovery, a variety of accessories/tools are required.

Shown below are standard accessories.

(1) 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.

(2) 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.

(3) Connection hose

a) 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

Va lv e

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

b) 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.

(4) Gauge manifold

• The most important service tool for refrigeration and air conditioner.

• Widely used when charging/recovering R410A while checking gas pressure.

(5) Tube piercing valve

a) 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.

b) As the piercing edge tends to wear, it is necessary to treat this valve as semi-expendables.

c) As vacuum rises, air tends to be inhaled from the hole. So, care must be exercised.

(6) 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

INVERTER WALL MOUNTED TYPE ROOM AIR-CONDITIONER

No.116(1.1A) R

Air-Conditioning & Refrigeration Systems Headquarters

16-5, 2-chome, Kounan, Minato-ku, Tokyo, 108-8215, Japan

Fax : (03) 6716-5926

Mitsubishi Heavy Industries SRK20ZG-S, SRK50ZG-S, SRK25ZG-S, SRK35ZG-S, SRK25ZG-SS Technical Manual

Specifications and Main Features

Frequently Asked Questions

User Manual