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

...

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.

+ 60 hidden pages

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

Specifications and Main Features

Frequently Asked Questions

User Manual