Mitsubishi Heavy Industries SRK25QA-S Bedienungsanleitung

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Mitsubishi Heavy Industries Air Conditioners

Technical Manual

Manual Number: 2011 No. W1-01

Variable Frequency Wall Mounted Type

Room Air Conditioners

(Split system, heat pump type)

SRK25QA-S/SRC25QA-S

SRK35QA-S/SRC35QA-S

(R410A Refrigerant Used)

MITSUBISHI HEAVY INDUSTRIES, LTD.

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Table of Contents

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

1.1 Features…………………………………………………………..…1

1.2 Model identification………………………………………………1

2 MODEL SELECTION…………………………………………………2

2.1 Model function..…………..…….……..………………………..……2

2.2 Range of usage……………………………………………..………4

2.3 Outline drawing…..………………………………………………..…4

2.4 Cooling cycle system diagram….…………………..…………...…5

2.5 Performance curve……………………………………………………6

3 ELECTRICAL WIRING DIAGRAM………………………………….7

4 NAME OF EACH PARTAND ITS FUNCTION……………….….….9

4.1 NAME OF EACH PART………………..………….………………9

4.2 Emergency “ON/OFF” button (back-up switch) …........………..12

4.3 Automatic restart……………..…………..………………………..12

4.4 Flap control………..…………..……..……………………………..12

4.5 Comfort timer setting……..……..……..…………………………..14

4.6 Outline of heating operation.……..………………………….……..15

4.7 Outline of cooling operation ............................................................ 17

4.8 Outline of drying operation ................................................. 18

4.9 Outline of automatic operation ..........................................................20

4.10 Economical operation.....................................................................20

4.11 Air blowing operation.......................................................................20

4.12 CLEAN operation control...................................................21

4.13 EEV control.....................................................................................21

5 INSTALLATION................................................................................22

5.1 Selection of installation location.................................................24

5.2 Installation of indoor unit..................................................................25

5.3 Installation of outdoor unit...............................................................28

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5.4 Pipe connection.................................................................................28

5.5 Precautions for wireless remote controller operation........................30

5.6 Standard running data........................................................................31

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

6.1 Electrical parts failure diagnosis method............................................32

6.2 Servicing.............................................................................................56

7 SERVICING MANUAL.......................................................................57

8MOUNT ASSEMBLY………………………….................................72

8.1 Indoor unit.........................................................................................72

8.2 Outdoor unit......................................................................................80

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1 GENERALINFORMATION

1.1 Features

(1) Inverter

● Heating/cooling

The rotate speed of the compressor is changed steplessly in relation to varying load, and is

linked with the fans of indoor and outdoor units controlled by the changes of frequency, thus

controls the power.

● Allowing quick heating/cooling operation during start-up period.

The room temperature is kept constant through fine-tuned control after the machine is

stabilized.

(2) Fuzzy control: According to the fuzzy control technology, the room temperature and humidity,

etc. are obtained through dynamic analysis to accurately regulate the rotate

speeds of the compressor and the fan to realize precise temperature control.

(3) Life: Actual service life: over 20,000 hours; Working life: over 100,000 hours; On/off of relay:

over 100,000 times; Continuous on of LED: over 50,000 hours; On/off of emergency

switch: over 10,000 times.

(4) Self diagnosis function: We will continuously provide the best services for our customers

through devices judging abnormal operation, as follows:

The air conditioner indicates the error of the indoor and outdoor sensors (thermistors) only when

it is in the stop mode. Error indication is removed after restart.

1.2 Model identification

R410A Refrigerant used

Master pattern change code

Master pattern

Capacity

Wall mounted type (C is the code for outdoor unit.)

Split type room air conditioner

TIMER lamp

RUN lamp

keeps flashing

RUN lamp

Flash 2 times

RUN lamp

Flash 1 time

Flash 2 times

Flash 5 times

Flash 6 times

TIMER lamp

Flash 1 time

Flash 2 times

Flash 4 times

Flash 1 time

Flash 2 times

Flash 3 times

Flash 4 times

Flash 5 times

Flash 6 times

Flash 2 times

Failure Causes

Heat exchanger sensor error

Room temperature sensor error

Abnormal voltage input

Indoor fan motor error

Outdoor unit temperature sensor

error

Outdoor unit heat exchanger liquid

pipe sensor error

Vent-pipe sensor error

Current cut

Outdoor unit error

Safe current

Power transistor error

Compressor over heat protection

Signal transmission error

Rotor lock

Heat exchanger sensor wire break, poor connector connection

Room temperature sensor wire break, poor connector connection

Voltage too high or too low

Failure of fan motor, poor connector connection

Outdoor unit sensor wire break, poor connector connection

Heat exchanger liquid pipe sensor wire break, poor connector

connection

Vent-pipe sensor wire break, poor connector connection

Compressor blockage, compressor output open-phase, power short

circuit, control valve closed

Power-cut, compressor wire break

Vent-pipe sensor wire break, poor connector connection

Compressor not rotating (dead lock)

Overload, over current

Failure of power transistor

Insufficient refrigerant, failure of vent-pipe sensor, control valve

closed

Failure of power supply, signal cable break, failure of

indoor/outdoor unit control device

Failure of compressor

Compressor open-phase

Failure of outdoor unit control device

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2 MODEL SELECTION

2.1 Model function

2.1.1 Model: SRK25QA–S (Indoor unit)

SRC25QA–S (Outdoor unit)

Item

Unit

Indoor unit SRK25QA–S

Outdoor unit SRC25QA–S

Net weight

Machine

dimension

790×222×268

780×290×540

Package

dimension

Length× Width

×Height

830×340×280

920×380×590

Color

White

Ash-colored

Fan

Through-flow type, AS resin + glass

fiber

Axial flow type, AS resin + glass

fiber

Air flow

m3/h

550

1830

Noise in cool

room

dB(A)

Hi/Me/Lo:

37/30/23(completely mute,

SPL)

45(completely mute, SPL)

Noise in warm

room

dB(A)

Hi/Me/Lo:

37/32/28(completely mute,

SPL)

48(completely mute, SPL)

Fan motor

Nominal value

16W, 4-step capacitor type

asynchronous motor, insulation

grade E

25W, AC motor, insulation grade B

Power of motor

W (reference

value)

Power of electric

control

W (reference

value)

7.5

Power supply and

power cord

Single-phase, 220V, 50Hz and 3-core, 1.0mm2, 250V, 10A, 2m, w/o plug

Heat exchanger

Spiral, hydrophilic, 3-folded,

16-section, 2-row, 452-fin, 1-2

circuit

Spiral, hydrophilic, 20-section,

1-row, 621-fin, 2-1 circuit

Compressor

Nominal value

THACOM RM - B5077MDE2, 527W, DC frequency conversion

compressor, insulation grade E

Refrigerating

machine oil

300, DIAMOND FREEZE MA68

Refrigerant

controller

Electronic expansion valve (Φ1.65mm) + hush pipe

Refrigerant

R-410A, 850g, addition/reduction not needed within the use range of 15m

Operating

pressure limit

Mpa

Max.: 4.1, Min.: 1.47

Air filter

Mould-proof air filter

Accessories and

quantity

Indoor unit 1, mounting plate 1, tapping screw 5, battery 2, use and

installation manual 1, remote controller 1, outdoor unit 1, Drain elbow 1,

Water shutoff plug 1

Operation control

devices

Wireless remote controller, electronic thermostat controlling room

temperature, microcomputer controlling defrosting

Safety devices

Serial signal protection, fan error protection, compressor over heat

protection, high voltage protection, over current protection, etc.

* The nominal values of “Noise in cool room” and “Noise in warm room” in the above table are tested in a dead

room.

Item

Unit

Rating cooling

Rating heating

Capacity

2500

3200

Power

700

870

Energy efficiency ratio

3.57

3.68

Energy efficiency grade

Grade A (European norm)

Note (1) The data are measured at the following conditions. The pipe length is 5m.

Item

Operation

Indoor air temperature

Outdoor air temperature

Standards

Cooling

27℃

19℃

35℃

24℃

Heating

20℃

—

7℃

6℃

Low temperature Heating

20℃

—

2℃

1℃

(2) The operation data are applied to the 220Vdistricts respectively.

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

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

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2.1.2 Model: SRK35QA–S (Indoor unit)

SRC35QA–S (Outdoor unit)

Item

Unit

Indoor unit SRK35QA–S

Outdoor unit SRC35QA–S

Net weight

9.5

Machine

dimension

790×222×268

780×290×540

Package

dimension

Length× Width

×Height

830×340×280

920×380×590

Color

White

Ash-colored

Fan

Through-flow type, AS resin + glass

fiber

Axial flow type, AS resin + glass

fiber (embedded damping spindle

sleeve)

Air flow

m3/h

520

1940

Noise in cool

room

dB(A)

Hi/Me/Lo: 40/33/25

Noise in warm

room

dB(A)

Hi/Me/Lo: 39/35/27

Fan motor

Nominal value

16W, 4-step capacitor type

asynchronous motor, insulation

grade E

24W, DC motor, insulation grade E

Power of motor

W (reference

value)

Power of electric

control

W (reference

value)

7.5

Power supply and

power cord

Single-phase, 220V, 50Hz and 3-core, 1.0mm2, 250V, 10A, 2m, w/o plug

Heat exchanger

Spiral, hydrophilic, 3-folded,

16-section, 2-row, 452-fin, 1-4

circuit

Child heat exchanger: Spiral,

hydrophilic, 1-row, 4-section,

408-fin

Spiral, hydrophilic, 20-section,

2-row, 1221-fin, 2-1 circuit

Pf1.4

Compressor

Nominal value

THACOM RM - B5077MDE2, 527W, DC frequency conversion

compressor, insulation grade E

Refrigerating

machine oil

300, DIAMOND FREEZE MA68

Refrigerant

controller

Electronic expansion valve (Φ1.5mm) + hush pipe

Refrigerant

R-410A, 900g, addition/reduction not needed within the use range of 15m

Operating

pressure limit

MPa

Max.: 4.15, Min.: 1.47

Air filter

Mould-proof air filter

Accessories and

quantity

Indoor unit 1, mounting plate 1, tapping screw 5, battery 2, use and

installation manual 1, remote controller 1, outdoor unit 1, Drain elbow 1,

Water shutoff plug 1

Operation control

devices

Wireless remote controller, electronic thermostat controlling room

temperature, microcomputer controlling defrosting

Safety devices

Serial signal protection, fan error protection, compressor over heat

protection, high voltage protection, over current protection, etc.

* The nominal values of “Noise in cool room” and “Noise in warm room” in the above table are tested in a dead

room.

Item

Unit

Rating cooling

Rating heating

Capacity

3500

4000

Power

1020

1100

Energy efficiency ratio

3.43

3.64

Energy efficiency grade

Grade A (European norm)

Note (1) The data are measured at the following conditions. The pipe length is 5m.

Item

Operation

Indoor air temperature

Outdoor air temperature

Standards

Cooling

27℃

19℃

35℃

24℃

Heating

20℃

—

7℃

6℃

Low temperature Heating

20℃

—

2℃

1℃

(2) The operation data are applied to the 220Vdistricts respectively.

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

-4-

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

2.2 Range of usage

Please use the air conditioners within the following range of usage, otherwise the protector will be

triggered.

Cooling Operation

Heating Operation

Outdoor temperature

About 18℃~43℃

About -15~24℃

Room temperature

About18℃~32℃

About below 30℃

Indoor humidity

About below 80%

25~35 Models

Max. piping one-way length

Within 15 m

Vertical height difference

Within 5 m

Additional R410A Refrigerant

Not required

Voltage

Rating ±10%

Starting voltage

At least 85% of rating

Switching frequency

Max. 10 times per hour

Time interval between stop and start

Min. 3 min

2.3 Outline drawing

(1) Indoor unit: SRK25QA–S/ SRK35QA–S Unit: mm

Piping hole right (left)

Terminal block

Remote controller

Flare connecting (Gas)

Flare connecting (Liquid)

Drainage pipe

Piping hole

VIEWA

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(2) Outdoor unit: SRC25QA-S/ SRC35QA-S Unit: mm

2.4 Cooling cycle system diagram

Models: QA-S Series

Note (1)……line is piping for site construction.

Drain holes

Terminal block

Flare connecting

Operation valve (Gas)

Operation

valve

(Liquid)

Indoor unit

Outdoor unit

Circulation of cooling

Circulation of heating

Flare connecting

Operation valve (Gas)

Outdoor air

temp. sensor

Air heat

exchanger

Heat exchanger

sensor

Gas liquid

separator

Compressor

Discharge pipe sensor

4-way valve

Check joint

Gas pipeNote (1)

model

Air heat

exchanger

Inlet air temp.

sensor

Air heat

exchanger sensor

Liquid pipe

Flare connecting

Filter

Electronic expansion valve

Hush pipe

Operation valve (Liquid)

Refrigerant inlet pipe

Refrigerant outlet

pipe

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2.5 Performance curve

The cooling and heating capacities are measured in the following conditions. The actual capacity

can be obtained with the following formula.

Actual capacity = Rating capacity x Correction factor

(1) Capacity correction according to indoor and outdoor temperatures:

Outdoor air W.B. temperature (°C W.B.) ISO-T1 Standard

⑵Capacity correction according to one way length of refrigerant piping:

It is necessary to correct the cooling and heating capacity according to the one way length of

refrigerant piping.

Piping length (m)

Cooling

1.0

0.99

0.975

Heating

1.0

⑶Capacity correction according to frosting on outdoor heat exchanger during heating:

In additions to the foregoing corrections (1) and (2), the heating capacity also needs to be

corrected according to the frosting on the outdoor heat exchanger.

Air inlet temperature of

outdoor unit

-10

-9

-7

-5

-3

-1

Frosting correction factor

0.95

0.94

0.93

0.91

0.88

0.86

0.87

0.92

1.00

⑷Example of cooling and heating capacity calculation:

The actual cooling capacity of model SRK25QA-S with the one way piping length of 25m at the

indoor wet-bulb temperature of 19℃and outdoor dry-bulb temperature of 35℃in summer or

indoor dry-bulb temperature of 20℃, outdoor dry-bulb temperature of 1℃and indoor wet-bulb

temperature of -1℃in winter is

Actual cooling capacity = 2500 x 1.0 x 0.95 ≈ 2375W

Nominal cooling Temp. correction Piping length

capacity factor correction factor

Actual heating capacity = 3200 x 0.81 x 0.95 x 0.86 ≈2118W

Nominal heating Temp. correction Piping length Frosting

capacity factor correction factor correction factor

Cooling

Heating

Accommodation

Cooling operation

Heating operation

Indoor air D.B.

temperature

Outdoor air D.B.

temperature

Indoor air W.B. temperature (°C W.B.) ISO-T1 Standard

Correction factor of cooling & heating

capacity in relation to temperature

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3 ELECTRICALWIRING DIAGRAM

3.1 Circuit diagram: 25QA-S

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