Mitsubishi Heavy Industries SRK13ZEV-S4, SRK22ZEV-S4 Technical Manual

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

SRK13ZEV-S4 SRK22ZEV-S4

ROOM AIR-CONDITIONING

TECHNICAL MANUAL & PARTS LIST

TECHNICAL MANUAL

1. SRK13ZEV-S4 .............................................................. 2

2. SRK22ZEV-S4 ............................................................ 60

MODEL SRK13ZEV-S4

CONTENTS

1.1 GENERAL INFORMATION......................................................................... 3

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

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

1.2 SELECTION DATA ..................................................................................... 4

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

(2) Range of usage & limitations ................................................................................ 5

(3) Exterior dimensions ............................................................................................... 5

(4) Piping system ......................................................................................................... 6

(5) Selection chart ........................................................................................................ 7

1.3 ELECTRICAL DATA ................................................................................... 8

(1) Electrical wiring ...................................................................................................... 8

1.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER .............. 9

(1) Operation control function by remote control switch ......................................... 9

(2) Unit ON/OFF button ................................................................................................10

(3) Power blackout auto restart function ...................................................................10

(4) Custom cord switching procedure ....................................................................... 11

(5) Flap control .............................................................................................................11

(6) Comfortable timer setting ......................................................................................12

(7) Outline of heating operation.................................................................................. 12

(8) Outline of cooling operation.................................................................................. 15

(9) Outline of dehumidifying operation ......................................................................16

(10) Outline of automatic operation ............................................................................. 19

(11) Outline of fan operation .........................................................................................19

(12) ION operation ..........................................................................................................20

(13) Protective control function ....................................................................................20

1.5 APPLICATION DATA .................................................................................. 25

(1) Selection of location for installation..................................................................... 26

(2) Installation of indoor unit ...................................................................................... 27

(3) Installation of outdoor unit ....................................................................................30

(4) Refrigerant piping................................................................................................... 30

(5) Test run.................................................................................................................... 31

(6) Precautions for wireless remote control installation and operation .................32

1.6 MAINTENANCE DATA ............................................................................... 33

(1) Troubleshooting procedures for electrical equipment........................................ 33

(2) Servicing ................................................................................................................. 44

1.7 REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL

FOR AIR CONDITIONERS USING R410A ................................................ 45

(1) Outline .....................................................................................................................45

(2) Refrigerant piping installation............................................................................... 46

(3) Installation, removal and servicing .......................................................................52

(4) Refrigerant recovery .............................................................................................. 57

1.1 GENERAL INFORMATION

(1) Specific features

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

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

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

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

¡ Heating/Cooling

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

fans controlled to change frequency, thus controlling the capacity.

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

unit has stabilized.

(b) Fuzzy control

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

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

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

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

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

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

the next time.

(d) Self diagnosis function

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

follows.

RUN light

TIMER light

1 time flash

2 time flash

6 time flash

Heat exchanger sensor error

Room temperature sensor error

Indoor fan motor error

(2) How to read the model name

Example : SR K 13 Z EV - S4

RUN light keeps flashing

RUN light

2 time flash

TIMER light Outdoor (LED)

1 time flash

2 time flash

4 time flash

1 time flash

2 time flash

3 time flash

5 time flash 5 time flash

6 time flash 6 time flash

7 time flash ON

2 time flash 7 time flash

OFF

1 time flash

2 time flash

3 time flash

R410A models

Series No.

Inverter type

Product capacity

Wall mounted type

Split type room air-conditioner

Outdoor air temperature sensor error

Outdoor heat exchanger sensor error

Discharge pipe sensor error

Current cut

Trouble of outdoor unit

Over current

Over heat of compressor

Error of signal transmission

Outdoor fan motor error

Rotor lock

1.2 SELECTION DATA

(1) Specifications

Model SRK13ZEV-S4 (Indoor unit)

Item Cooling capacity Heating capacity Power source 1 Phase, 220V, 50Hz

(1)

Operation data

Exterior dimensions

Height × Width × Depth

Color Cool white Stucco white Net weight kg 12 39 Refrigerant equipment

Compressor type & Q’ty

Heat exchanger Louver fins & inner grooved tubing Straight fins & inner grooved tubing Refrigerant control Capillary tubes + Electronic expansion valve Refrigerant Refrigerant oil R 0.36 (RB68A) Deice control Microcomputer control

Air handling equipment

Fan type & Q’ty

Air flow (at High)

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

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

Operation switch Room temperature control Microcomputer thermostat – Pilot light RUN (Green), TIMER (Yellow), JET/HI POWER (Green), ION (Green)

Safety equipment

Refrigerant

piping

Drain hose Connectable Power source cord 2 m (3 cores with Earth)

Connection wiring

Accessories (included) Mounting kit, Clean filter (Allergen clear filter × 1, Natural enzyme filter × 1) Optional parts –

SRC13ZEV-S4 (Outdoor unit)

Model

(1)

Cooling input kW 0.93 (0.105~1.5) Running current (Cooling) A 5.5 Heating input kW 1.38 (0.095~2.490) Running current (Heating) A 6.8 Inrush current A 6.8 COP Cooling: 4.30 Heating: 4.35

Noise level

Motor kW – 1.1 Starting method – Line starting

Motor W 33 34

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: 0.54 m

Insulation Necessary (Both sides)

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

Cooling Sound level 46 47

Heating Sound level 46 47

(3)

(Cooling) (Heating)

Size × Core number 1.5 mm2 × 4 cores (Including earth cable) Connecting method Terminal block (Screw fixing type)

Item Indoor air temperature Outdoor air temperature

Operation DB WB DB WB

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

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

The piping length is 7.5m.

(2) The operation data are applied to the 220V 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 25 m, add 20 g refrigerant per meter.

W 4000 (400~5000) W 6000 (400~9000)

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

CMM

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

SRK13ZEV-S4 SRC13ZEV-S4

298 × 840 × 259 595 × 780 × 290

– 5CS102XFA (Scroll type) × 1

Tangential fan × 1 Propeller fan × 1

Wireless-Remote control –

Gas line : 0.47 m

(220V)

–

Standards

(2) Range of usage & limitations

Indoor return air temperature (Upper, lower limits)

Refrigerant line (one way) length Max. 25m

SRK13ZEV-S4

Power source voltage Rating ± 10%

Voltage at starting Min. 85% of rating

Frequency of ON-OFF cycle Max. 10 times/h

ON and OFF interval Max. 3 minutes

Outdoor air temperature (Upper, lower limits)

Vertical height difference between outdoor unit and indoor unit

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

Item

Model

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

Cooling operation : Approximately 21 to 43˚C

Heating operation : Approximately

5 to 21˚C

840

298

Piping hole right

259

right: 67

left : 60

14.5

813

603

VIEW A

44.5

47.5220.5

207.5

73.5

53.5

Piping hole (ø65)

Indoor unit

Installating board

Drain hose 515 (ø16)

Piping for gas 533.5 (ø9.52)

Piping for liquid 603.5 (ø6.35)

63.5

8.5

5.3

284.2

44.5

73.5

182.5

450

693

(3) Exterior dimensions

(a) Indoor unit

Model SRK13ZEV-S4

(b) Outdoor unit

Outdoor unitIndoor unit

Heat exchanger

Room temp. sensor

Humidity sensor

Heat exchanger

Solenoid valve

Flare connecting

Heat exchanger sensor

Piping (Liquid) ø6.35

Piping (Gas) ø9.52

Check joint

4 way valve

Service valve (Liquid)

Flare connecting

Discharge pipe temp. sensor

Cooling cycle

Heating cycle

Outdoor air temp. sensor

Heat exchanger sensor

Compressor

uffler

Capillary tube Capillary tube

Strainer

Service valve (Gas)

Electronic expansion valve

14.4

595

96.5

42.5

35°

90.6

29.7

340

13.5

312.5

17.5

164

286.4

290

45.4

49.6

463

62780

106 510

Drain holes

2-16 × 12

Ground terminal

Terminal block

Service valve (Liquid)

Service valve (Gas)

Flare connection ø6.35 (1/4")

Flare connection ø9.52 (3/8")

Unit: mm

Model SRC13ZEV-S4

(4) Piping system

Model SRK13ZEV-S4

(5) Selection chart

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

1005-5

16 18 20 22 24

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

Heating

Applicable range

27 25

20 15

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

Cooling

Heating operation

Indoor air D.B.

temperature

˚C D.B.

Cooling operation

Outdoor air D.B.

temperature

˚C D.B.

Coefficient of cooling &

Heating capacity in

relation to temperature

Piping length [m]

Cooling

Heating

1.0

0.99

1.0

0.975

1.0

0.965

1.0

0.95

1.0

Air inlet temperature of

outdoor unit in ˚C WB

Adjustment coefficient

-5

0.91-30.88-10.8610.8730.9251.00

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

obtained in the following way.

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

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

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

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

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

How to obtain the cooling and heating capacity

Example : The net cooling capacity of the model SRK13ZEV-S4 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 = 4000 ✕ 0.975 ✕ 1.0 = 3900 W

SRK13ZEV-S4 Length 15m

Factor by air temperatures

1.3 ELECTRICAL DATA

(1) Electrical wiring

Model SRK13ZEV-S4

Outdoor unit

Indoor unit

Printed circuit

board

TB TB

F (250V 20A)

U V

C2 S.IN R.IN

Th4

Th5

Th6

CNB

CNE

CNA

CND

Power

transistor

20S

EEV

FMo

Black Brown Red Blue White

Yellow/Green

BK BR RD BL WH

Y/GN

Yellow

Color symbol

Meaning of marks Symbol

Parts name

Compressor motor

Fuse

Fan motor (Indoor)

FMo

an motor (Outdoor)

SM RE

Flap motor Reactor

Symbol

Parts name

Room temp. sensor

Heat exchanger sensor (Indoor unit)

Humidity sensor

Heat exchanger sensor (Outdoor unit)

Outdoor air temp. sensor

Discharge temp. sensor

Symbol

Parts name

20S

4 way valve (coil)

ZNR

Varistor

52C

Magnetic contactor

Diode stack

EEV

Electronic expansion valve

Solenoid valve

ZNR

250V 3A

CNM

Printed circuit board

JEM-ACNFCNE

52C3

CNG

52C

52C4

CNU

6 5

CNL

CNV

CNN

T4 ION generator

Safety switch

Display

Wireless R-Amp

Back-up switch

Y/G

Th1 Th2 Th3

Heat exchanger

Power source 1 Phase

220V 50Hz

( )

1.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

TEMP

SLEEP

ECONO

ACL

OFF

DRY MODE

AIR FLOW

CANCEL

ion

START

JET/

JET

ECONO

AM PM

SLEEP

MED

AUTO

FAN SPEED

MODE

TIME

SET UP

TIMER

JET

ECONO

AM PM

SLEEP

MED

AUTO

(1) Operation control function by remote control switch

Remote control

Model SRK13ZEV-S4

S Operation section

FAN SPEED button

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

JET/HI POWER button

This button changes the JET/HI POWER mode

OPERATION MODE select button

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

ON/OFF button

Press for starting operation, press again for stopping.

DRY MODE button

This button changes the DRY mode.

ION button

This button selects ION operation.

START button

This button selects ON TIMER operation.

SLEEP button

This button selects SLEEP operation.

ECONO switch

This switch changes the ECONOMY mode.

TIME SET UP switch

This switch for setting the TIME.

S Indication section

Indicates during SLEEP operation.

Indicates set temperature. (Does not indicate temperature when operation

mode is on AUTO)

Indicates set air flow rate with lamp.

Indicates during economy mode operation.

Indicates during Hi power mode operation.

SLEEP indicator

TEMPERATURE indicator

FAN SPEED indicator

ECONOMY MODE indicator

HI POWER MODE indicator

• The above illustration shows all controls, but in

practice only the relevant parts are shown.

TEMPERATURE button

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

TIMER time.)

AIR FLOW button

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

(Air scroll) (Flap stopped)

CANCEL button

This button cancels the ON timer and SLEEP timer.

RESET switch

Switch for resetting microcomputer.

ON TIMER indicator

Indicates during ON TIMER operation.

OPERATION MODE indicator

Indicates selected operation with lamp.

[ (Auto) • (Cool) • (Heat) • (Dry) • (Fan)]

Time indicator

Indicates present time or timer setting time.

DRY MODE indicator

Shows the various DRY modes.

AIR FLOW indicator

Shows selected flap mode.

Unit indication section

Model SRK13ZEV-S4

JET/HI POWER light (green)

Illuminates during JET/HIGH POWER operation.

ION light (green)

Illuminates during ION operation.

RUN (HOT KEEP) light (green)

• Illuminates during operation.

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

TIMER light (yellow)

Illuminates during TIMER operation.

(2) Unit ON/OFF button

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

unit on and off.

(a) Operation

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

(b) Details of operation

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

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

Function

Operation mode

Cooling About 24ºC

Thermal dry About 25ºC Auto Auto Continuous

Heating About 26ºC

Room temperature

setting

Fan speed Flap Timer switch

(3) Power blackout auto restart function

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

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

(b) The following settings will be cancelled:

(i) Timer settings

(ii) High-power operations

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

factory. Consult with your dealer if this function needs to be switched off. (2) When power failure ocurrs, the timer setting is cancelled. Once power is resumed, reset the timer. (3)

If the jumper wire (J1) is cut, auto restart is disabled. (See the diagram at right)

Unit ON/OFF button

Jumper wire (J1)

Thick line : Rapid movement

Thin line : Slow movement

Stops for approximately 5 seconds in the horizontal position.

Stops for approximately 5 seconds in this position.

Thick line : Rapid movement

Thin line : Slow movement

(4) Custom cord switching procedure

Jumper wire (J2)

If two wireless remote controls are installed in one room, in order to prevent wrong

operation due to mixed signals, please modify the printed circuit board in the indoor

unit’s control box and the remote control using the following procedure. Be sure to modify

both boards. If only one board is modified, receiving (and operation) cannot be done.

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

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

(J2) using wire cutters.

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

the lead wires, etc.

(b) Modifying the wireless remote control

i) Remove the battery.

ii) Cut the jumper wire shown in the figure at right.

(5) Flap control

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

(a) Air scroll

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

(i) Starting time of operation

During cooling and

dry operation

During heating

operation

Cut

(ii) When not operating

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

(b) Memory flap

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

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

¡ Recommendable stopping angle of the flap

COOL•DRY

Flap moves in upward and downward directions continuously.

Horizontal blowing

HEAT

Slant forward blowing

(6) Comfortable timer setting

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

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

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

(Max. 60 minutes)

Operation mode Operation start time correction value (Min.)

At cooling

At heating

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

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

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

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

time.

(Example) Heating

Setting temperature

Room temperature

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

+5 No change –5

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

+5 No change –5

Operation starting time

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

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

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

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

↑↑

Current operation Correction value start time

Time

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

Setting time

(7) Outline of heating operation

(a) Operation of major functional components in heating mode

Item

Functional components

Indoor fan motor ON ON OFF

Flaps ON or OFF ON or OFF Stop position control

Display Lights up Lights up Lights up or flashes

52C ON ON OFF after stop mode

Outdoor fan motor OFF ON OFF

4-way valve

Electronic expansion valve Depending on the EEV control

Solenoid valve OFF OFF OFF

(b) Air flow selection

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

Air flow selection

Auto

MED

Inverter command speed 12~118rps

Air flow Depends on inverter command speed.

Inverter command speed 12~118rps

Air flow Depends on inverter command speed.

Inverter command speed 12~78rps

Air flow Depends on inverter command speed.

Inverter command speed 12~38rps

Air flow 4th speed fixed

When the inverter

speed is 0rps

Depending on the stop mode

Model

When the inverter speed

is other than 0rps

SRK13ZEV-S4

When the inverter speed is 0rps

due to an anomalous stop

Depending on the stop mode

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

AB 2823 29.5 31.5 34 36 37.5 39 40

AB2931 32 34 40 47

(i) Fuzzy operation

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

(ii) Heating thermostat operation

¡ Operating conditions

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

¡ Detail of operation

Model

Item

Inverter speed 0rps [Comp. stopped] Indoor fan Hot keep normal mode → 1st speed

Outdoor fan Stop

Flap Horizontal

(iii) Hot keep operation

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

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

7th speed

Indoor fan

5th speed

4th speed

3rd speed

2nd speed

1st speed

OFF

6th speed

SRK13ZEV-S4

8th speed

¡ Values of A, B

At 0 rps command 22 25

Other than 0 rps command

17 19

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

Indoor heat exchanger temp. (˚C)

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

7th speed

5th speed

6th speed

¡ Values of A, B

At 0 rps command 22 25

Other than 0 rps command

Indoor fan

4th speed

3rd speed

2nd speed

1st speed

OFF

Indoor heat exchanger temp. (˚C)

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

(iv) Defrosting operation

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

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

continuously.

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

sensor temperature exceeded 4.5°C

5 During continuous compressor operation

In addition, when the speed command from the indoor controller of the indoor unit during heating operation has counted 0 rps 10 times or more and all conditions of 1, 2 and 3 above are satisfied (note that when the temperature for Th4 is -2°C or less: 62 rps or more, -1°C or less: less than 62 rps), defrost operation is started.

17 19

Indoor fan

RUN light

Corresponding to speed

OFF

Flashing

(Hot keep)

Outdoor fan

Inverter command

Fuzzy calculated

value

70 rps

Corresponding

to speed

OFF

(1)

4-way valve

OFF

Solenoid valve

Final defrost operation

Defrost control

Hot keep

Indoor unit

Outdoor unit

120 sec.

Hot keep

100 sec.

Normal heating operation restored

Defrost end

(Th4 5˚C, 10 minutes)

Defrost operation

Defrost operation preparation

6th speed 6th speed

> =

2) Operation of functional components during defrosting operation

Depends on inverter command speed

1 speed up

-3

-2

Room temp. - Setting temp. (deg)

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

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

1 Outdoor heat exchanger sensor (Th4) temperature: 5ºC or higher 2 Continued operation time of defrosting → For more than 10 min.

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

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

¡ Detail of operation

Model

Item

Inverter speed 118 rps

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

Outdoor fan 6th speed

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

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

SRK13ZEV-S4

(vi) Heating “JET” operation (JET button on remote control: ON)

1) Detail of operation

Model

Item

Inverter speed 12~122 rps

Air flow Depends on inverter command speed

2) Indoor fan control

The indoor fan is controlled as shown at right in accordance with

the difference between the room temperature and setting

SRK13ZEV-S4

temperature. However, the limit after increasing the speed by 1

speed is 8 speeds.

(8) Outline of cooling operation

(a) Operation of major functional components in cooling mode

Item

Functional components

Indoor fan motor ON ON OFF

Flaps ON or OFF ON or OFF Stop position control

Display Lights up Lights up Lights up or flashes

52C ON ON OFF after stop mode

Outdoor fan motor OFF ON OFF

4-way valve

Electronic expansion valve Depending on the EEV control

Solenoid valve OFF OFF OFF

When the inverter

speed is 0rps

Depending on the stop mode

When the inverter speed

is other than 0rps

OFF

When the inverter speed is 0rps

due to an anomalous stop

Depending on the stop mode

(b) Air flow selection

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

Air flow selection

Auto

MED

Inverter command speed 12~94rps

Air flow Depends on inverter command speed.

Inverter command speed 12~94rps

Air flow Depends on inverter command speed.

Inverter command speed 12~50rps

Air flow Depends on inverter command speed.

Inverter command speed 12~30rps

Air flow 2nd speed fixed.

Model

SRK13ZEVS4

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

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

(i) Fuzzy operation

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

temperature setting correction temperature and the suction air temperature.

(ii) Cooling thermostat operation

1) Operating conditions

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

2) Detail of operation

Model

Item

Inverter speed 0 rps [Comp. stopped]

Indoor fan Corresponds to fan speed switch.

Outdoor fan Stop

SRK13ZEV-S4

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

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

1) Detail of operation

Model

Item

Inverter speed 94rps

Indoor fan 7th speed

Outdoor fan 6th speed

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

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

SRK13ZEV-S4

(iv) Cooling “JET” operation (JET button on remote control: ON)

Depends on inverter command speed

1 speed up

Room temp. - Setting temp. (deg)

Low -3 +3 High

Cooling oriented

dehumidifying

Heating oriented

dehumidifying

Reheat dehumidifying

Room temp. _ Setting temp. (deg)

c Range

b Range

a Range

50 55

Humidity (%)

III Range

II Range

I Range

-2

+10-1

Room Temp. – Setting Temp. (deg)

1) Detail of operation

Model

Item

Inverter speed 12~96 rps

Air flow Depends on inverter command speed

SRK13ZEV-S4

2) Indoor fan control

The indoor fan is controlled as shown at right in accordance with the

difference between the room temperature and setting temperature.

However, the limit after increasing the speed by 1 speed is 8 speeds.

(9) Outline of dehumidifying operation

(a) Operation start control

For 20 seconds when each type of dehumidifying starts, during judgment each hour, for 3 minutes when switching operations,

when the indoor fan is at 4th speed, the outdoor fan is at 3rd speed dehumidifying operates and the indoor and outdoor temperatures

are detected. However, during operation, (except when the On timer is in the wait state) each type of dehumidifying operation

starts immediately.

(b) Dehumidifying operation

After implementing operation start control, the operation content is determined in accordance with room temperature and the set

temperature.

If one hour passes following the decision on the dehumidifying operation mode, and after operation start control, the decision is

made for another dehumidification cooling operation, a heating oriented dehumidifying operation or a reheat dehumidifying.

(i) Cooling oriented dehumidifying operation

1) Detail of operation

Model

Item

Inverter speed 60 rps

Indoor fan motor 4th speed

Outdoor fan motor 5th speed

4-way valve OFF

Solenoid valve OFF

Note (1) When a JET operation signal is received from the remote control, the indoor unit’s fan speed is increased by 1 speed.

SRK13ZEV-S4

2) Operation change conditions

After 3 minutes have passed since the start of a cooling oriented dehumidifying operation, when the room setting temperature

becomes less than 0 degree, the dehumidifying operation changes to reheat dehumidifying.

(ii) Reheat dehumidifying

1) Operation range

The operation range is determined in accordance with the room temperature, setting temperature and humidity.

Temperature range

Humidity range a range A range A range B range b range A range B range C range c range B range B range C range

I range II range III range

2) Detail of operation

30 30

Range

3rd speed

1st speed

ON OFF

Outdoor fan motor

Solenoid valve

Indoor fan motor

Inverter speed

12 minutes 12 minutes

Reheat

dehumidifying

control

Reheat

dehumidifying

control

+ 1 speed up

12 minutes

Temperature and humidity check

Reheat dehumidifying

operation range decision

OFF

Range

2nd speed

1st speed

Stop

10 22 248

Outdoor temperature (°C)

Notes (1) If the operation range switches from a range other than the A range to the A range, the command speed is set at 10 rps for 10 seconds.

(2) The indoor unit’s fan speed does not change even if JET operation signals are received from the remote control.

3) Operation change conditions

a) After 12 minutes of a reheat dehumidifying operation have passed, if the room temperature < setting temperature -5

(during gentle dry is -10), after the stop mode is implemented, the operation change to a heating oriented dehumidifying

operation.

b) After 12 minutes of a reheat dehumidifying operation have passed, if the room temperature > setting temperature +5,

after the stop mode is implemented, the operation changes to a cooling oriented dehumidifying operation.

4) Reheat dehumidifying outdoor unit fan control

The outdoor unit’s fan speed is controlled as shown below in accordance with the outdoor temperature.

5) Reheat dehumidifying frost prevention control

a) Operating conditions

After 10 minutes have passed since a speed command other than 0 rps has been output, when either of the following

conditions is satisfied.

1 Indoor unit heat exchanger temperature

2 Indoor unit heat exchanger temperature

b) Detail of operation

1 Command speed: 0 rps

2 Indoor unit fan: 3rd speed

3 Outdoor unit fan: Stopped

c) Reset conditions

Indoor unit heat exchanger temperature: 4ºC or higher.

2ºC or lower continuously for 30 minutes

= <

-1ºC

(iii) Heating oriented dehumidifying

1) Detail of operation

Model

Item

Inverter command speed 80 rps

Indoor unit fan 4th speed

Outdoor unit fan 5th speed

4-way valve ON

Solenoid valve OFF

Notes (1) When a JET operation signal is received from the remote control, the indoor unit fan’s speed is raised 1 speed.

2) Operation change conditions

After 3 minutes have passed since the start of heating oriented dehumidifying, if the room temperature > setting

temperature -1 and the discharge pipe temperature is 50ºC or higher, the stop mode is implemented, then cooling cycle

operation begins and changes to the reheat dehumidifying operation.

3) Cooling cycle operation control

a) Detail of operation

SRK13ZEV-S4

Model

Item

Inverter speed 30 rps

Indoor fan motor OFF

Outdoor fan motor OFF

4-way valve OFF

Solenoid valve OFF

SRK13ZEV-S4

b) Reset conditions

When 6 minutes have passed and the outdoor heat exchanger temperature is

9ºC. However, the maximum operating

time is 9 minutes regardless of the outdoor heat exchanger temperature.

(i) After the operation start control in item (a) is performed, the setting temperature is determined in accordance with the room

temperature.

Setting temperature = Room temperature

However, if the setting temperature becomes

28ºC, the setting temperature upper limit is set at 28ºC. The setting humidity is 55%.

(ii) Determining the operation content

1 Outdoor temperature < 20ºC: Heating oriented dehumidifying regardless of the setting temperature. 2 Outdoor temperature

20ºC:

If the room temperature < setting temperature + 3ºC, operation is in the reheat dehumidifying mode.

If the room temperature

setting temperature + 3ºC, operation is in the cooling oriented dehumidifying mode.

For the dehumidifying operation, see the dehumidifying operation for item (b).

(d) Laundry dry operation control

(i) After the operation start control in item (a) is performed, the setting temperature is determined in accordance with the room

temperature and outdoor temperature.

Setting temperature = Room temperature + 6ºC or the room temperature, whichever is lower.

However, if the setting temperature is

If the setting temperature becomes

20ºC the bottom limit of the setting temperature is 20ºC.

25ºC, the setting temperature upper limit is set at 25ºC. The setting humidity is 40%.

(ii) Determining the operation content

1 Outdoor temperature < 20ºC: Heating oriented dehumidifying regardless of the setting temperature. 2 Outdoor temperature

20ºC: If the room temperature < setting temperature - 3ºC, operation is in the heating oriented

dehumidifying mode.

If the setting temperature – 3ºC

room temperature < setting temperature + 3ºC, operation

is in the reheat dehumidifying mode.

If the room temperature

setting temperature +3°C, operation is in the cooling oriented

dehumidifying mode.

For the dehumidifying operation, see the dehumidifying operation for item (b).

(iii) Stop conditions

1 After 3 hours pass. 2 After 1 hour has passed, when it is judged 4 times to continue reheat dehumidifying in the A range, and it doesn’t occur

the 4th time.

(e) Low temperature dehumidifying protective control (Cooling oriented dehumidifying or reheat dehumidifying)

27.5

25.5

19.5

Inverter command speed

Indoor fan motor

Outdoor fan motor

Flap

Speed 6 Speed 5

0rps

OFF

Depend on the flap control

Speed 3 Speed 2

AUTO HI MED LO

Functional components

Fan speed switching

(i) Operating condition: When the room temperature or outdoor temperature becomes lower than 4ºC.

(ii) Detail of operation

Model

Item

Inverter speed 0 rps

Indoor fan motor 2nd speed

Outdoor fan motor Stop mode

4-way valve Stop mode

Solenoid valve Stop mode

SRK13ZEV-S4

(iii) Reset condition: After 7 minutes have passed.

(10) Outline of automatic operation

(a) Determination of operation mode

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

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

operation.

Cooling

Room temperature (˚C)

Heating

Outdoor temperature (˚C)

Dehumidifying

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

operation mode, changes the operation mode.

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

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

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

the wireless remote control and the setting temperature.

Signals of wireless remote control (Display)

–6 –5 –4 –3 –2 –1 ±0+1+2+3+4+5+6

Setting

temperature

Cooling 18 19 20 21 22 23 24 25 26 27 28 29 30

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

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

(11) Outline of fan operation

(a) Operation of major functional components

(12) ION operation (Ion button on the remote control is ON)

Indoor heat exchanger

temperature (°C)

2.5 5 8

0 rps

12 rps

Inverter

command

speed

Humidity (%)

68 73

A range

B range

Operates

Stopped

Humidity (%)

The negative ion generator operates, generating negative ions.

Operation content

Negative ion generator ON

Indoor

unit fan

ION light Lights up.

Air conditioner operating In accordance with the air conditioner settings

Air conditioner stopped In accordance with fan operation settings

Note (1) The negative ion generator is run and stopped in

accordance with the humidity sensor value.

(13) Protective control function

(a) Dew condensation prevention control [Cooling (including automatic), cooling oriented dehumidifying operation]

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

operation starts.

1) When the inverter command speed is higher than 28 rps.

2) When the humidity sensor value is higher than 68%.

(ii) Detail of operation:

Model

Item

Air flow MED

Air flow LO

Other Settings

Notes (1) The A range and B range are as shown at right.

Upper limit of inverter speed A range: 50 rps, B range: 30 rps

Indoor fan motor 5th speed

Upper limit of inverter speed A range: 50 rps, B range: 30 rps

Indoor fan motor 4th speed

Upper limit of inverter speed A range: 50 rps, B range: 30 rps

Indoor fan motor Depends on inverter speed

(2) There is no 1-speed rise in speed during JET operation control.

SRK13ZEV-S4

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

1) The inverter speed is less than 28 rps.

2) The humidity sensor value less than 63%.

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

(i) Operating conditions

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

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

(ii) Detail of anti-frost operation

Indoor heat exchanger

Item

Indoor command speed 12 rps 0rps

Indoor fan Depends on operation mode 2nd speed

Outdoor fan 4th speed OFF

4-way valve OFF Depends on stop mode

Solenoid valve Depends on operation mode Depends on stop mode

temperature

5°C or lower 2.5°C or lower

(iii) Reset conditions: After 5 minutes of operation,

the indoor heat exchanger temperature (Th2) is 8ºC or higher.

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

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

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

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

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

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

fans are not changed.)

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

(e) Compressor protection start

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

seconds.

(ii) After (i) above, if the decision speed is 96 rps or higher, it runs for 5 minutes at 96 rps, then changes to the decision speed. (iii) At thermo operation (OFF → ON) this control is not executed.

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

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

(f) Low load starting

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

is moved to the command speed.

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

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

Dehumidification: Speed decided in the operation region

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

(g) Inching prevention

When the compressor goes into the thermo operation within 3 minutes since operation start or becomes various dehumidifying

operations, the operation is continued with the command speed of 12 rps forcibly.

(h) Current safe

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

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

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

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

Operation starts again after a delay time of 3 minutes.

(i) Current cut

(i) Purpose: Inverter is protected from overcurrent.

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

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

(j) Heating overload protective control

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

temperature (detected by Th5) rose beyond 17ºC for 2 minutes continuously.

(ii) Detail of operation

1) Indoor fan speed is raised forcibly by 1 step. However, when the air flow is LO, the fan speed is not raised by 1 step.

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

upper limit, the upper limit value is maintained.

3) The outdoor fan is set on 2nd speed.

4) JET operation control does not raise the speed by 1 step

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

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

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

(k) Cooling overload protective control

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

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

(ii) Detail of operation

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

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

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

3) The upper limit of control speed is 96 rps.

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

(l) Freezing cycle system protective control

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

after the start of operation.

1) Command speed is higher than 60 rps

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

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

(ii) Detail of operation

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

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

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

operation.

(m) Compressor overheat protection

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

overheat.

(ii) Detail of operation

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

(Example) Fuzzy

After lapse of 3 min. or over

80 90 110

Discharge pipe temperature (˚C)

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

(2) When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps. (3) If the discharge pipe temperature is still 80ºC or greater but less than 90ºC even when the inverter command speed is maintained for 3 minutes when

the temperature is 80ºC or greater but less than 90ºC, 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

SRK13ZEV-S4 22 38

(3)

Lower limit

(4)

4 rps

(1)

4 rps

0 rps

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

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

there is no start at the third time.

(n) Serial signal transmission error protection

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

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

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

(o) High pressure control

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

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

(iii) Detail of operation:

(Example) Fuzzy

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

or over for 1 minute continuously, the inverter is stopped. (2) When the indoor unit heat exchanger temperature is in the range of A~B ºC, if the inverter command speed is been maintained and the operation has

continued for more than 20 seconds at the same speed, it returns to the normal heating operation. (3) Indoor blower retains the fan tap when it enters in the high pressure control. Outdoor blower is operated in accordance with the speed.

After lapse of 20 Sec. or over

Indoor unit heat exchanger temperature (˚C)

¡ Temperature list

ABC

RPSmin < 88 46 53.5 58.5

RPSmin < 108 41 48.5 53.5

108

RPSmin 36 43.5 48.5

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

(2)

Unit : ºC

Lower limit speed 35 rps

8 rps

(1)

8 rps

0 rps

(p) Heating low outdoor temperature protective control

◆ < I > (i) Operating conditions: When the outdoor air temperature sensor (Th5) is 4°C or lower continues for 30 seconds while

outdoor speed is other than 0rps.

(ii) Detail of operation: When the inverter command speed is less than 22rps, the speed is forcibly set at 22rps. However,

when the thermo becomes OFF, the speed is reduced to 0rps.

(iii) Reset condition: When the outdoor air temperature sensor (Th5) becomes 6°C or higher.

◆ < II > (i) Operating conditions: When the outdoor air temperature sensor (Th5) is 0°C or lower continues for 5 minutes while

outdoor speed is other than 0rps.

(ii) Detail of operation: Outdoor fan is stepped up by 1 speed step. (Upper limit 7th speed) (iii) Reset condition: When the outdoor air temperature sensor (Th5) becomes 2°C or higher.

◆ < III >

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

exchanger temperature (Th4) is less than -10°C for 1 minutes.

(ii) Detail of operation:

1 Outdoor air temperature

-7°C: The upper limit of inverter command speed is 60 rps.

2 Outdoor air temperature > -7°C: The upper limit of inverter command speed is 70 rps.

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

1 When the outdoor heat exchanger temperature (Th4) becomes -7°C or higher.

2 When the inverter command speed is 0rps.

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

Function Operation

Heating,

heating oriented dehumidifying

Heating,

heating oriented dehumidifying

Cooling,

cooling oriented dehumidifying

Cooling,

cooling oriented dehumidifying

When stopped by indoor unit controller

Reheat

dehumidifying

Reheat

dehumidifying

When stopped or reset by outdoor unit protective function

Inverter

speed

3 min.

6 th speed 6 th speed 6 th speed

6 th speed

6 th speed 6 th speed

3 min. 3 min.

2 min.

55 sec.

2 min.

45 sec.

2 min.

45 sec.

4 min. 40 sec.

2 min.

55 sec.

1 min 1 min 1 min 1 min 1 min

1st speed

1 min

2 min.

55 sec.

2 min.

55 sec.

Indoor

fan

Outdoor

fan

4-way valve

Solenoid

valve

Stop

Full stop

[0 rps command]

Stop

Full stop

[0 rps command]

Stop

Full stop

[0 rps command]

Stop

Restart

[0 rps command]

Stop

Restart

[0 rps command]

Stop

Restart

[0 rps command]

OFF

Command speed

0 rps

Speed dependent

OFF

Speed responsive

or reheat

dehumidifying

control

Indoor

power

relay

Hot keep

(i) Operating condition: When inverter command speed of less than 26 rps continues for 60 minutes

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

outdoor fans are not changed.)

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

(r) 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.

(s) Stop mode

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

heating oriented mode to the cooling oriented mode or vice versa, or when the dehumidifying operation is changed from

reheat dehumidifying to the heating or when the inverter speed turns to 0 rps. [When 0 rps is commanded from the indoor unit

controller, or when an outdoor protective function is actuated]

(ii) Detail of operation

1.5 APPLICATION DATA SAFETY PRECAUTIONS

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

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

WARNING section. However, there is also a possibility of serious consequences in relationship to the points listed in the

CAUTION section as well. In either case, important safety related information is indicated, so by all means, properly observe all

that is mentioned.

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

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

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

WARNING

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

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

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

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 insufficient,

injury can result from a falling of the unit.

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

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

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

connection part, through properly securing it. Improper connection or securing can result in heat generation or fire.

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

result 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)

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

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

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

¡ Install the outdoor unit so that the aluminum fins on the air heat exchanger cannot be touched. Failure to observe this

may result in injury.

¡ 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.

CAUTION

(1) Selection of location for installation

5 cm

10 cm

1.5 cm

6.5 cm

(a) Indoor unit

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

air can be evenly distributed.

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

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

space mentioned below can be secured)

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

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

the sun or the strong rays of the street lighting.

(b) Outdoor unit

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

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

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

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

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

Left side

Right side

100

Air inlet

Air Outlet

100

600

No obstacles (Service space for electrical parts)

Unit : mm

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

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

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

prevented for keeping the normal performance capacity.

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

operation.

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

hood will not face directly into the most windy direction.

2) Design the base higher than possible snow deposit.

height difference.

Model

Item One way piping length (R) 25 m

Outdoor Vertical height difference (h)

unit is lower

Outdoor unit

is higher

SRK13ZEV-S4

15 m

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.

above shall be secured.

Snow hood

Height: Must be over the possible snow deposit height

(2) Installation of indoor unit

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

450207.5

53.5

63.5

182.5

693

50 50

73.5 73.5

100

8.5284.25.3

44.5

47.5220.5

40 Speace

for service

15 Speace

for service

Speace for service

Speace for

service

Indoor unit

Installation board

Piping hole (ø65) Piping hole (ø65)

Drain hose 515 (ø16)

Piping for liquid 603.5

Piping for Gas 533.5

INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW)

Unit : mm

(a) Installation of installation board

(i) Fixing of installation board

Adjustment of the installation board in the horizontal

direction is to be conducted with four screws in a

temporary tightened state.

Standard hole

Adjust so that board will be level by turning the board

with the standard hole as the center.

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

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

(i) Drill a hole with ø65

whole core drill

Indoor side Outdoor side

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

indoor side to outdoor side.

(iii) Install the sleeve

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

Indoor side

Paste

Fixing on concrete wall

Use of nut anchor Use of bolt anchor

Bolt (M6 × 12)

Mounting board

Nut (M6)

Mounting board

(ii) Adjusting sleeve length

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.

View of sleeve when installed

Turn to tighten

Outdoor side

Sleeve

Indoor side Outdoor side

Max. 10

Wall thickness

Inclined flange

Sealing plate

+ 1.5 cm

(i) Mounting of connecting wires

1) Remove the lid.

2) Remove the wiring clamp.

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

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

H Harmonized cable type

05 300/500 volts

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

4or5 Number of conductors

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

green)

1.5 Section of copper wire (mm2)

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 grille.

(ii) Installing the support of piping

[Shaping the piping] [Taping of the exterior]

Piping

Terminal block

Clamp

Lid

Drain hose

¡ Hold the bottom of the piping and fix direction before

stretching it and shaping it.

¡ Tape only the portion that goes through the wall.

Always tape the crossover wiring with the piping.

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

[Top View]

Left-hand-sided-piping Right-hand-sided-piping

Piping in the left rear direction

Piping in the left direction

Piping in the right rear direction

Piping in the right direction

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

Right

Rear

Downward

Left rear

Left downward

Left

[Drain hose changing procedures]

1. Remove the drain hose.

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

¡Remove the drain hose,

making it rotate.

¡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.

Gutter

¡Insert the drain hose

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

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.

Pipe accommodation section

Drainage

¡ Arrange the drain hose in a downward angle. ¡ Avoid the following drain piping.

Odor from the gurtter

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.

¡ 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

When it is exposed indoor.Drain hose

(iii) Fixing of indoor unit

Indoor unit

Latch (2 locations)

Installation board

Indoor unit base lower latch

Wall

Installation board

¡ How to remove the indoor unit from the installation board

1 Remove the right and left lids. 2 At the marked portion of the indoor unit base lower latch,

pull downward with fingers.

(both right and left hand sides)

(The indoor unit base lower latch can be removed from the

installation board)

Extended 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.

Lid (left)

The marked portion of the indoor unit base lower latch

Lid (right)

(3) Installation of outdoor unit

Terminal block

Interconneting wire

(a) Installation of outdoor unit

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

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

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

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

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

bolts, wire, etc.

(b) Connection of indoor and outdoor connecting wiring

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

make sure to connect correctly.)

Brown

For power supply, indoor outdoor

2 Blue Connecting wiring 3 Black

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

Do not put wire into the unit.

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

Indoor/outdoor signal wire (Low voltage)

(4) Refrigerant piping

(a) Preparation

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

Indoor unit side

(Do not

turn)

¡ Remove the flared nuts.

(on both liquid and gas sides)

Remove

(b) Connection of refrigerant piping

Indoor unit side

¡ Connect firmly gas and liquid side

pipings by Torque wrench.

Outdoor unit side

¡ Remove the flared nuts.

(on both liquid and gas sides)

Press

Remove

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

then flare the pipes.

Outdoor unit side

¡ Connect firmly gas and liquid side

pipings by Torque wrench.

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

Spanner

(for fixing the piping)

Torque wrench

¡ Specified torquing value:

Liquid side (ø6.35) : 14.0~18.0N·m (1.4~1.8kgf·m) Gas side (ø12.7) : 49.0~61.0N·m (4.9~6.1kgf·m)

¡ Always use a Torque wrench and back up spanner to tighten

the flare nut.

¡ Specified torquing value:

Liquid side (ø6.35) : 14.0~18.0N·m (1.4~1.8kgf·m) Gas side (ø12.7) : 49.0~61.0N·m (4.9~6.1kgf·m)

¡ Use one more spanner to fix the valve.

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)

(i) Tighten all flare nuts in the pipings both indoor and outside will so as not to cause leak. (ii) Connect service valve, charge hose, manifold valve and vacuum pump as is illustrated below. (iii) Open manifold valve handle Lo to its full width, and perform vacuum or evacuation.

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

(– 76 cmHg). (iv) After completing vacuum operation, fully open service valve (Both gas and liquid sides) with hexagon headed wrench. (v) Detach the charge hoses. (vi) Check for possible leakage of gas in the connection parts of both indoor and outdoor.

¡ 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

When refrigerant piping exceeds 15m conduct additional refrigerant charge by weight after refrigerant piping completion. Additional charge amount per meter = 20g/m

[Example]

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

(d) Insulation of connecting portion

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

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

To cover the connecting portion with

Vinyl tape

insulation materials, cut upper portion and then seal it with insulation materials.

(ii) Finishing and fixing

1) Tie up the piping with wrapping tape, and shape it so that it conforms to which the pipe is attached.

2) Fix them with clamps as right figure.

(5) Test run

(a) Conduct trial run after confirming that there is no gas leaks. (b) When conducting trial run set the remote controller thermostat to continuous operation position. However when the power source

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

1) When there is something wrong with the electric outlet and if the insertion of the electric plug is insufficient, there may occur a burn out.

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

Insulation

Refrigerant piping

Electrical wiring

Covering tape

Drain hose

Tapping screw

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.

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

(e) Make sure that drain flows properly.

(f) Standard operation data

Model

Item

High pressure (MPa)

Low pressure (MPa)

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

Running current (A)

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

Cooling –

Heating 2.4~2.6

Cooling 1.1~1.3

Heating –

Cooling 13~17

Heating 32~36

Cooling 5.5

Heating 6.8

SRK13ZEV-S4

(220V)

(6) Precautions for wireless remote control installation and operation

(a) Wireless remote control covers the following distances:

(i) When operating facing the air conditioner:

Notes (1) The remote control is correctly facing the sensing

5 m or less

or less

Wireless remote control

5 m or less

or less

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

the receiver status.

(ii) When manipulating the remote control mounted on a

wall:

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

signal is audible) before mounting.

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.

Receiver

Remote control available in this area.

1.6 MAINTENANCE DATA

YES

(1) Troubleshooting procedures for electrical equipment

(a) Cautions

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

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

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

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

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

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

(b) Items to check before troubleshooting

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

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

3 Is a power supply with the correct voltage connected?

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

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

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

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

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

1 The Run light does not light up.

2 The flaps do not open.

3 The indoor unit fan motors do not run.

4 The self-diagnosis display does not function.

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 voltage is correct, it will be

within the following voltage range. 198 ~ 242 V

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

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

YES

Confirm the contents of the customer complaint.

The cause of the trouble can be specifically identified.

Check the self-diagnosis display.

See page 35.

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

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

Replace the faulty component, then perform an operation check.

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.

(e) Self-diagnosis table

When a heat exchanger sensor wire disconnection is detected while operation is stopped. (If a temperature of –20ºC or lower is detected for 12 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 12 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 12 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 12 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 12 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 power transistor, 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 30 rps or less and the current save has operated. (the compressor stops)

• Overload operation

• Overcharge

• Compressor locking

Current safe stop

3 time

flash

OFF

1 time

flash

2 time

flash

5 time

flash

6 time

flash

Keeps

flashing

Safety switch operates.

(2)

(The air conditioner stops.)

• Defective safety switch

• Easy clean flap setting is defective.

Trouble of safety switch

Keeps

flashing

OFF

3 time

flash

Outdoor

unit

LED

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) Even if the easy clean flap is disconnected, if the indoor unit’s fan motor is not stopped, check the limit switch’s connector connection.

(f) Inspection procedures corresponding to detail of trouble

40 50 60

–10

Sensor error

Is connector connection good?

YES

Is sensor resistance value good?

YES

Replace PCB.

◆ Discharge pipe sensor temperature characteristics

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

Correct connection.

Replace sensor.

[Broken sensor wire, connector poor connection]

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

(Broken wire)

Resistance (kΩ)

(Shortcircuit)

Temperature (˚C)

Indoor fan motor error

Is connector connection good?

YES

* Disconnect the fan motor

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

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

YES

Normal

Replace indoor PCB

Correct connector connection

Is DC fan motor resistance value good?

YES

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

Replace indoor fan motor

Notes (1) See pages 40 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.)

Current cut

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

[Open phase on compressor output terminal, compressor lock]

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

YES

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

YES

Is there any shortcircuit?

YES

Inspect compressor.

Secure space for suction and blow out.

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

Abnormality of outdoor unit

Defective inverter

If check results are normal, compressor is locked.

[Compressor malfunction of insufficient gas (refrigerant)]

Current safe stop

Is refrigerant charge quantity adequate?

YES

Is outdoor ventilation condition good?

YES

Inspect compressor.

YES

Defective inverter

Discharge refrigerant.

Secure space for inlet and outlet.

[Overload operation, compressor lock, overcharge]

Over heat of compressor

[Gas shortage, defective discharge pipe sensor]

Is discharge pipe sensor resistance value good?

Is sufficient quantity of refrigerant circulated?

Defective outdoor unit PCB

(page 36)

YES

Error of signal transmission

Does error persist after power reset?

YES

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

YES

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

Connector connection check, resistance

value check, replacement of discharge pipe sensor

Does trouble persist after charging gas?

YES

Clogged capillary tube or strainer, defective EEV, etc.

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

Trouble by transient cause, not unit trouble.

Correct improper wire connection on indoor/ outdoor unit.

Defective indoor unit PCB

Check if there are any places where gas is leaking.

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

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

Defective outdoor unit PCB

Trouble of safety switch

● Flashing Conditions

When the safety switch is operating.

YES

Is the easy clean flap set correctly?

YES

Is the safety switch normal?

YES

Replace the printed circuit board.

Check crossover wires.

Defective indoor unit PCB. Check crossover wires.

[Defective safety switch, easy clean flap defective.]

Notes (1) Even if the easy clean flap is disconnected, if the

Correct the setting and reset.

Replace the safety switch.

indoor unit’s fan motor is not stopped, check the safety switch’s connector connection.

Outdoor fan motor error

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

Is connector connection good?

YES

* Disconnect the fan motor

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

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

YES

Normal

Rotor lock

Replace outdoor PCB

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

Correct connector connection

Is DC fan motor resistance value good?

YES

Replace outdoor fan motor

Defective inverter

[Compressor defect, outdoor unit circuit defect]

YES

Inspect compressor.

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

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

(i) Indoor unit

Sensor

Room temperature sensor

Heat exchanger sensor

Humidity Sensor

Operation mode

Cooling Release of continuous compressor operation command

Heating Continuous compressor operation command is not released.

Cooling

Heating High pressure control mode

Cooling 1 in the table below.

Heating Normal system operation is possible.

Compressor stop. (Abnormality of outdoor unit)

Shortcircuit Broken wire

Phenomenon

1 Humidity sensor operation

Failure mode Control input circuit reading

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

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

wire

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

Disconnected

1 and 2 are short circuited

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 reading is 100% Operates in the Cooling region.

Air conditioning system operation

If check results are normal, compressor is locked.

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.

Humidity sensor element

Connector (CnF)

Humidity sensor assembly

(ii) Outdoor unit

Is there voltage between terminal blocks 1 and 2 ? (AC 220 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 A)

YES

123456

DC15V

Indoor unit circuit board

DC 308V

DC several V (4~6 V)

CNU

(–)

GND

Blue

Yellow

White

Black

Red

Sensor

Heat exchanger sensor

Outdoor air temperature sensor

Discharge pipe sensor

Operation mode

Cooling System can be operated normally.

Heating Defrosting is not performed.

Cooling System can be operated normally.

Heating Defrosting is not operated.

All modes

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

(h) Checking the indoor electrical equipment

(i) Indoor unit circuit board check procedure

Phenomenon

Shortcircuit Broken wire

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

(ii) 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

Measuring Point Resistance when Normal

1 – 3 (Red – Black)

4 – 3 (White – Black) 30 kΩ or higher

25 MΩ or higher

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

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

that the fan motor is faulty.

Printed circuit

board

F2 (250V 20A)

WH RD

S.IN

R.IN

Th4

Th5

Th6

CNB CNE CNA

CND

Power

transistor

20S

EEV

FMo

Y/GN

◆ Inspection of resistance value of discharge pipe

sensor

Remove the connector and check the resistance value.

See the section of sensor characteristics on page 36.

◆ Inspection of electronic expansion valve

To test if there is voltage.

◆ Check point of outdoor unit (SRC13ZEV-S4)

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 220V 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.

(i) Outdoor unit inspection points

Measure in this sectionOperation SW ON

8~10 sec.

Output voltage

(ACV)

(Example) Self-diagnosis display : Flashes 2 times

For about 50 seconds. After being switched on, the will be a delay of approximately one minute depending on the conditions.

FM0

Outdoor unit circuit board

DC several V (4 ~ 7 V)

CNA

DC15V

DC308V

GND

(–)

Blue

Yellow

White

Black

Red

123456

◆ Power transistor inspection procedure

[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 below can be measured, the power transistor and the circuit board for the

outdoor unit are normal.

◆ Outdoor unit fan motor check procedure

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

Perform this check after checking if the indoor unit is normal.

(i) Outdoor unit printed circuit board output check

1) Turn off the power.

2) Disconnect connector CNA for the fan motor in the outdoor unit.

3) Turn on the power, then press the unit ON/OFF button continuously for 5 seconds or longer (to turn the unit ON). When an

indoor unit operates, if there is an output from pin No. (2) in the following diagram for 30 seconds 20 seconds after the unit

ON/OFF button is turned “ON,” the circuit board is normal and the fan motor is faulty. If no voltage is output, the outdoor

unit’s circuit board is faulty and the fan motor is normal.

Note (1) After 3 minutes, the voltage at Pin No. (2) is output again one time for 30 seconds, then the indoor unit detects an error.

(ii) DC Fan motor resistance check

Measuring Point Resistance when Normal

6 – 4 (Red – Black)

3 – 4 (White – Black) 30 kΩ or higher

25 MΩ or higher

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

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

that the fan motor is faulty.

(j) How to make sure of remote control

JET

ECONO

AM PM

SLEEP

MED

AUTO

Is remote

control normal?

(1)

Remote control defects

YES

Again pushing operating switch

Operating the unit?

Does unit ON/OFF button operates?

Operating the unit.

Control problem on main unit

YES

Abnormality is not found.

Replace the display.

Is the unit

operable with remote

control?

Defective 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.

YES

Normal

(2) Servicing

(a) Evacuation

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

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

equipment will freeze, causing what is called water clogging.

¡ Evacuation procedure

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

should be relieved through the check joint.

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

(iii)

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

Start the vacuum pump.

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

Liquid side

Gas side

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

Check joint

Close low pressure valve 1 of gauge manifold.

Service hose

Stop the vacuum pump.

Charge hose

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.

Vacuum pump

(b) Refrigerant charge

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

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

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

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

amount.

(iv)

Purge air from the charge hose A

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

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

(v)

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

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

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

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

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

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

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

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

between suction air and outlet air.

Gauge manifold

Refrigerant cylinder

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

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

(1) Outline

(a) Refrigerant R410A

(i) Adoption of R410A in air conditioners

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

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

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

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

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

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

which do not deplete the ozone layer.

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

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

R22 at the same refrigerant temperature.

(ii) Chemical characteristics of R410A

1) Chemical stability

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

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

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

it only in a well ventilated area.

2) Composition changes (Pseudo-azeotropic characteristics)

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

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

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

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

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

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

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

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

3) Pressure characteristics

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

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

Table 1. Comparison of thermophysical properties of R410A and

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.

R410A R22

Table 2. Comparison of saturated vapor pressure 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.

unit: MPa

(iii) Lubricating oils for R410A

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

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

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

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

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

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

(b) Safety during installation/servicing

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

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

precautions into consideration.

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

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

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

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

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

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

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

gas may occur.

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

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

level.

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

result.

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

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

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

tioner technician or electrician.

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

(2) Refrigerant piping installation

(a) Piping materials and joints used

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

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

affected by contaminants.

(i) Copper pipes

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

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

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

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

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

is available on the market.

Table 3. Thicknesses of annealed copper pipes

Thickness (mm)

Nominal

Outer diameter

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

R410A [ref.] R22

(ii) Joints

Union

Half union

Tee

Elbow

Half elbow

Socket Socket with

different diameter

90° elbow A type

90° elbow B type

Fitting reducer

Tee

Tee with

different diameter

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

1) Flare joints Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm. In such a case, socket joints can be used. Sizes of flare pipe ends, flare joint ends and flare nuts are as shown in Tables 5~8 (see on page 48, 49) below. Also, union, half union, Tee-type union and elbow-type union shapes are generally used (see Fig 1).

Fig.1 Flare joints

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

Table 4.Minimum thicknesses of socket joints

Nominal Reference outer diameter Minimum joint thickness

diameter of copper pipe jointed (mm) (mm)

1/4 6.35 0.50

3/8 9.52 0.60

1/2 12.70 0.70

5/8 15.88 0.80

(b) Processing of piping materials

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

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

2) Removing burrs and chips If the flared section has chips or burrs, refrigerant leakage may occur. Carefully remove all burrs and clean the cut surface

before installation.

3) Insertion of flare nut

Fig.2 Socket joints

4) Flare processing

øD

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.

Fig.3 Flare processing dimensions

Table 5. Dimensions related to flare processing for R410A

A (mm)

Nominal Outer diameter Thickness diameter (mm) (mm)

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

Flare tool for R410A

Clutch type

Conventional flare tool

Clutch type Wing nut type

Table 6. Dimensions related to flare processing for R22

A (mm)

Nominal Outer diameter Thickness diameter (mm) (mm)

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

Flare tool for R410A

Clutch type

Conventional flare tool

Clutch type Wing nut type

Nominal Outer diameter Thickness diameter (mm) (mm)

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

Fig.4 Relations between flare nut and flare seal surface

Table 7. Flare and flare nut dimensions for R410A

Dimension (mm)

AB C D

[unit: mm]

Flare nut width

Table 8. Flare and flare nut dimensions for R22

Nominal Outer diameter Thickness diameter (mm) (mm)

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

ABCD

Dimension (mm)

Flare nut width

(ii) Flare connecting procedures and precautions

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

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

3) Tighten the flare with designated torque by means of a torque wrench. The tightening torque for R410A is same as that

for conventional R22. Incidentally, when the torque is weak, the gas leakage may occur. When it is strong, the flare nut

may crack and may be made nonremovable. When choosing the tightening torque, comply with values designated by

manufacturers. Table 9 shows reference values.

Note : When applying oil to the flare surface, be sure to use oil designated by the manufacturer. If any other oil is used, the lubricating oils may deteriorate

and cause the compressor to burn out.

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)

Tightening torque of torque

wrenches available on the

market N·m (kgf·cm)

[unit: mm]

(i) Types and storage of piping materials

Refrigerant piping materials for air conditioners are broadly classified into the following types.

Refrigerant piping materials

with heat insulation without heat

with flare processing without flare processing without flare processing

General name : (a) Piping set : (b) Copper pipe with insulation

: (c) Bare copper pipe insulation (bare copper pipe)

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 46) 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.

(ii) Identification

1) Piping set

A copper pipe as piping set for R410A must have a thickness as stated in Table 3 (see on page 46), and, as shown in Tables 5

and 6 (see on page 48), it also differs from R22 in flare processing and flare nut dimensions. So, it is necessary to choose a

piping set suitable for R410A.

2) Copper pipe with insulation

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

3) Bare copper pipe

It is necessary to use a bare copper pipe which has a thickness designated in Table 3 (see on page 46) and contains less

contaminants. As the bare copper pipe surface is naked, it is necessary to treat it with exceeding care and adopt a means for

identification to prevent improper usage by making it easily discriminable from other piping materials.

(iii) Precautions before installation

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

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

2) Exercise great care when performing piping installation on a rainy day.

When water enters into the piping, the lubricating oil may deteriorate and cause the equipment to fail.

3) Carry out the piping connection in as short a time as possible.

If the piping is left open for a long period, fully purge the interior with nitrogen gas or dry it with a vacuum pump.

(d) Brazing

(i) Processing the connected parts

As brazing is molten between the joined surfaces to yield high adhesive strength, it is necessary to secure a wide enough space to

be joined and also an adequate clearance between the joined surfaces. Copper pipe joints’ minimum insertion depths, outer pipe

diameters and clearances between outer and inner pipe diameters are as shown in Table 10. In the case of bronze brazing filler,

when the clearance is about 0.05~0.1mm, the pipes can be connected most strongly.

* When joining the pipes, either the pipe ends are processed, or pipes are connected by brazing with a socket joint.

(ii) Brazing filler metal

1) Alloy brazing filler

An alloy mainly composed of silver and copper is used to join iron, copper or copper alloy. Although it excels in solderability,

it is relatively expensive.

2) Phosphor bronze brazing filler

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

3) Low temperature solder

An alloy of tin and lead. An ordinary type of solder. Since it is weak in adhesive strength, it should not be used for refrigerant

pipe brazing.

* Cautions:

a) BCuP tends to react with sulphur and produce a fragile compound water solution, which may cause a gas leakage. So,

b) When performing brazing again at the time of servicing, use the same type of brazing filler.

Table 10. Copper pipe joints’ minimum insertion depths and clearances

Outer pipe diameter Clearance

D (A-D) × 1/2

(mm) (mm)

5~8 6 0.05~0.35

8~12 7 0.05~0.35

12~16 8 0.05~0.45

Minimum insertion depth

(mm)

use any other type of brazing filler at a hot spring resort, etc., and coat the surface with a paint.

(iii) Flux

1) Reasons for the use of flux

• By removing the oxide film and any foreign matter on the metal surface, it assists the flow of brazing filler.

• In the brazing process, it prevents the metal surface from being oxidized.

• By reducing the brazing filler’s surface tension, the brazing filler adheres better to the treated metal.

2) Properties required for flux

•Temperature at which flux is active coincides with the brazing temperature.

• Due to a wide effective temperature range, flux is hard to carbonize.

• It is easy to remove slag after brazing.

• The corrosive action to the treated metal and brazing filler is negligible.

• Excels in coating performance and is harmless to the human body.

As the flux works in a complicated manner as described above, it is necessary to choose an adequate type of flux according to

the type and shape of treated metal, type of brazing filler and brazing method, etc.

3) Types of flux

• Incorruptible flux

Generally, it is a compound of borax and boric acid. Effective in cases where the brazing temperature is higher than 800°C.

• Activated flux

Most of fluxes generally used for silver brazing fall under this type.

It features an increased oxide film removing capability due to the addition of compounds such as potassium fluoride, 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).

(iv) Brazing

As brazing requires sophisticated techniques and experiences, it must be performed by a qualified person.

In order to prevent the oxide film from occurring in the pipe interior during brazing, it is effective to proceed with brazing while

letting dry nitrogen gas (N

2) flow.

1) Attach a reducing valve to the nitrogen gas cylinder

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

3) Apply a seal onto the clearance between the piping and inserted pipe for the nitrogen gas in order to prevent the nitrogen gas

from flowing backward.

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

5) Adjust the flow rate of nitrogen gas so that it is lower than 0.05m

/h, or 0.02MPa (0.2kgf/cm2) by means of the reducing valve.

6) After taking the steps above, keep the nitrogen gas flowing until the piping cools down to a certain extent (i.e. temperature at

which pipes are touchable with finger).

7) Completely remove the flux after brazing.

Flow meter

Stop valve

Reducing

valve

Piping

Rubber plug for sealing

From the nitrogen cylinder

Nitrogen gas

Fig.5 Prevention of oxidation during brazing

* Cautions during brazing

1 General cautions

1) The brazing strength should be high as required.

2) After operation, airtightness should be kept under a pressurized condition.

3) During brazing do not allow component materials to become damaged due to overheating.

4) The refrigerant pipe work should not be come blocked with scale or flux.

5) The brazed part should not restrict the flow in the refrigerant circuit.

6) No corrosion should occur from the brazed part.

2 Prevention of overheating

Due to heating, the interior and exterior surfaces of treated metal may oxidize. Especially, when the interior of the

refrigerant circuit oxidizes due to overheating, scale occurs and stays in the circuit as dust, thus exerting a fatally adverse

effect. So, make brazing at adequate brazing temperature and with a minimum of heating area.

3 Overheating protection

In order to prevent components near the brazed part from overheating damage or quality deterioration due to flame or

heat, take adequate steps for protection such as (1) by shielding with a metal plate, (2) by using a wet cloth, and (3) by

means of heat absorbent.

4 Movement during brazing

Eliminate all vibration during brazing to protect brazed joints from cracking and breakage.

5 Oxidation preventive

In order to improve the brazing efficiency, various types of antioxidant are available on the market. However, the con-

stituents of these are widely varied, and some are anticipated to corrode the piping materials, or adversely affect HFC

refrigerant, lubricating oil, etc. Exercise care when using an oxidation preventive.

(3) Installation, removal and servicing

(a) Tools for R410A

In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being charged accidentally, the service

port diameter of the outdoor unit control valve (3-way valve) has been changed. Also, to increase the pressure resisting strength,

flare processing dimensions and sizes of opposite sides of flare nuts (for copper pipes with nominal diameters 1/2 and 5/8) have

been changed. During installation/service, therefore, prepare tools exclusive for R410A shown in (i) on page 53 and general tools

shown in (ii) on page 54.

(i) Tools exclusive for R410A

1) Gauge manifold

• As R410A is characterized by high pressure, conventional tools cannot be used.

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

• In order to prevent any other refrigerant from being charged accidentally, each port of the manifold has been changed in

shape.

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

2) Charge hose

• As R410A is characterized by high pressure, the pressure resistance of the charge hose has been increased. The material has

also been changed to an HFC resistant type, and, as in the case of each port of the manifold, the hose cap size has been

changed. Furthermore, for prevention of gas pressure reaction, a charge hose with a valve placed near the cap is also avail-

able.

Table 13. Differences between conventional charge hose and that for R410A

Conventional charge hose Charge hose for R410A

Pressure resistance

Normal pressure

Breaking pressure

Engineering material NBR rubber

Cap size

3.4 MPa (34 kgf/cm2) 5.1 MPa (51 kgf/cm2)

17.2 MPa (172 kgf/cm2) 27.4 MPa (274 kgf/cm2)

HNBR rubber

internally coated with nylon

7/16 UNF 1/2 UNF

20 threads per inch 20 threads per inch

3) Electronic balance for refrigerant charging

• As R410A belonging to the HFCs features high pressure and high evaporating speed, when R410A is charged by using a

charging cylinder, R410A in the cylinder cannot be kept in a liquefied state and gasified refrigerant bubbles in the charging

cylinder, it becomes difficult to read values. Therefore, it is advisable to adequately use an electronic balance for refrigerant

charging.

• An electronic balance for refrigerant charging has higher strength due to its structure with four points of support for refrig-

erant cylinder weight detection. As the charge hose connecting part has two ports-one for R22 (7/16 UNF 20 threads per

inch) and the other for R410A (1/2 UNF 20 threads per inch) - it can also be used for charging the conventional refrigerant.

•Two types of electronic balance for refrigerant charging are available - one for 10kg cylinder and the other for 20kg cylinder.

Electronic balance for 10kg cylinder precision ± 2g Electronic balance for 20kg cylinder precision ± 5g

• Refrigerant is charged manually by opening/closing the valve.

4) Torque wrench (for nominal diameters 1/2 and 5/8)

• Along with changes in flare nut sizes for enhanced pressure resisting strength, torque wrenches for R410A differ in opposite

side size.

Table 14. Differences between conventional wrenches and those 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)

Conventional torque wrench Torque wrench for R410A

5) Flare tool (clutch type)

•A flare tool for R410A is provided with a large clamp bar receiving hole so that the projection of the copper pipe from the

clamp bar can be set at 0~0.5 mm in flare processing, and also features higher spring strength for increased expansion pipe

torque. This flare tool can also be used for R22 copper pipe.

6) Gauge for projection adjustment (used when flare processing is made by using conventional flare tool [clutch type])

•

A gauge 1.0 mm in thickness which helps in easily setting the projection of the copper pipe from the clamp bar at 1.0~1.5 mm.

7) Vacuum pump adapter

• It is necessary to use an adapter for preventing vacuum pump oil from flowing back to the charge hose. The charge hose

connecting part has two ports - one for conventional refrigerant (7/16 UNF 20 threads per inch) and the other for R410A. If

the vacuum pump oil (mineral) mixes with R410A, a sludge may occur and damage the equipment.

8) Refrigerant cylinder

•A refrigerant cylinder exclusive for R410A comes identified with refrigerant name and is coated with pink paint as desig-

nated by the ARI, U.S.A.

9) Charge port and packing for refrigerant cylinder

• According to the charge hose’s cap size, a charge port with 1/2 UNF 20 threads per inch and corresponding packing are

required.

10) Gas leakage detector

•A high sensitivity gas leakage detector exclusive for HFC refrigerant is used. In the case of R410A, the detection sensitivity

is about 23g per year.

(ii) General tools

1) Vacuum pump

2) Torque wrench

for 1/4: opposite side 17 mm × for 1/4: opposite side 17 mm × for 3/8: opposite side 22 mm ×

3) Pipe cutter

4) Reamer

5) Screwdriver (+, -)

6) Hacksaw

(16 N·m) (160 kgf·cm)

(18 N·m) (180 kgf·cm) (42 N·m) (420 kgf·cm)

7) Hole core drill (ø65 or 70)

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

9) Spanner, or monkey wrench

10) Tape measure

11) Thermometer

12) Clamping ampere meter

13) Insulation resistance tester (mega tester)

14) Electro circuit tester

15) Pipe bender

(iii) Applicability of R410A tools 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.

Table 15. Applicability of R410A tools to R22 model

Tools for R410A Applicable to R22 model

(b) New installation work (when using new refrigerant piping)

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

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

1) Connect the charge hose to the outdoor unit. 1

2) Connect the charge hose to the vacuum pump adapter. 2 At this time, keep the control valves in the fully closed position. 3 4

3) Place the handle Lo in the fully opened position 5, and turn on the vacuum pump’s power switch. During this step, perform evacuating (about 10 ~ 15 minutes); for the evacuating time, refer to the equipment manufacturer’s manual.

4) When the compound gauge’s pointer has indicated -0.1 MPa (-76 cmHg) 6, place the handle Lo in the fully closed position 5, and turn OFF the vacuum pump’s power switch Keep this state for 1~2 minutes, and ascertain that the compound gauge’s pointer does not return.

5) Fully open the control valves. 3 4

6) Detach the charge hoses. 1 2

7) Tightly secure the cap on the service port. 7

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

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.

Fig.6 Configuration of air purge by vacuum pump

(ii) Additional refrigerant charging required for refrigerant piping length longer than standard length (The following steps should be

taken following the step 5) in (i) above. See Fig. 7)

1) Set the refrigerant cylinder to the electronic balance, and connect the connecting hoses on the cylinder and electronic balance’s connecting port. * Caution:

Be sure to make setting so that liquid can be charged. When using a cylinder equipped with a siphon, liquid can be charged without turning it upside down.

2) Connect the gauge manifold’s charge hose to the electronic balance’s connecting port. 3 2

3) Open the refrigerant cylinder’s valve, and, after opening the charging valve a little, close it. 1 2

4) After making zero (0) adjustment, open the charging valve and, by opening the gauge manifold’s valve Lo, charge the liquid refrigerant. 2 5 (Before handling the electronic balance, refer to its instruction manual).

5) When the designated amount of refrigerant could not be charged, make additional charging bit by bit by cooling operation (for the amount of each addition, follow the instruction manual prepared by the equipment manufacturer). If the first additional charging was not enough, make the second additional charging after about one minute in the same manner as the first additional charging. * Caution:

Be sure never to charge a large amount of liquid refrigerant at once to the unit in cooling mode, since liquid is charged from the gas side.

6) After charging liquid refrigerant into the air conditioner by closing the charging valve, stop operation by fully closing the

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)

gauge manifold’s valve Lo. 2 5

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

When stopped halfway, refrigerant being cycled will be released.

8) After securing the caps on the service port and control valve, check the caps’ periphery to see if there is any gas leakage. 6 7

Fig.7 Configuration of additional refrigerant charging

(i) Removing the unit

1) Recovery of refrigerant from the outdoor unit by pump down

• At the time of pump down, use a gauge manifold exclusive for R410A.

• Operating the unit in forced cooling mode, recover refrigerant from the outdoor unit.

(For details of reclaiming steps and precautions, see the instruction manual prepared by the equipment manufacturer)

* Caution:

In the case of an outdoor unit which is incapable of pump down, use a refrigerant recovery unit.

2) Removing the indoor/outdoor units

• Remove the piping and wiring between the indoor and outdoor units.

•Tighten the outdoor unit’s control valves and service port with the specified torque.

•Tighten the capped flare nuts at the indoor/outdoor units connecting part with the specified torque.

• Remove the indoor/outdoor units.

* Caution:

When storing the indoor unit piping in its original position, be careful not to break the piping.

(ii) Installing the unit

1) Proceed with the installation following the steps described in “ (b) New installation work”.

(d) Replacing the unit (Never use the existing refrigerant piping)

Use a brand-new refrigerant piping (1) when replacing the air conditioner using the conventional refrigerant (R22) with an air

conditioner using the alternative refrigerant (R410A) or (2) even when replacing the air conditioner using the alternative refrigerant

(R410A) with another air conditioner using R410A, as a problem may occur due to differences in pressure characteristics of refrig-

erant or differences in type of lubricating oil (air conditioners using R410A do not always use the same type of the lubricating oils).

(e) Retrofitting

Do not operate the air conditioner which has used the conventional refrigerant (R22) by charging the alternative refrigerant (R410A).

Otherwise, the equipment may cease to function normally and go wrong, or even cause serious problems such as rupture of the

refrigeration cycle.

(f) Refrigerant recharging at servicing

When it becomes necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following

steps.

(For details, see the instruction manual prepared by the equipment manufacturer)

1) Connect the charge hose to the outdoor unit’s service port.

2) Connect the charge hose to the vacuum pump adapter. At this time, keep the control valves in the fully opened position.

3) Place the handle Lo in the fully opened position, and turn ON the vacuum pump’s power source. (For the evacuating time, refer

to the equipment manufacturer’s manual)

4) When the compound gauge’s pointer has indicated -0.1 MPa (-76 cmHg), place the handle Lo in the fully closed position, and

turn OFF the vacuum pump’s power source. Keep this state for 1 ~ 2 minutes, and ascertain that the compound gauge’s pointer

does not return.

5) Charge liquid refrigerant by using the electronic balance according to the steps described in Section (b)(ii) (pages55~56).

(4) Refrigerant recovery

(a) Recovering procedures

The following procedures for refrigerant recovery represent general procedures, and they may differ between actual cases depend-

ing upon the type of refrigerant recovering equipment. The connecting and handling methods for different type of refrigerant

recovering equipment may also differ. So, ascertain the details by referring to the respective instruction manuals, etc.

(i) Checks prior to recovering procedures

1) Checking the refrigerant recovering equipment

1 Gas leakage [If there is any malfunction, repair it]. 2 Oil separator [Drain the residual oil]. 3 Recovering equipment weighing function, overcharge preventing function (float switch), moisture indicator, drier and

other accessory functions [should be adjusted or replaced where necessary].

4 Electrical circuit

2) Checking the accessories to the refrigerant recovering equipment

(ii) Preparations for recovering procedures

1) Installation of refrigerant recovering equipment

Install the equipment in a place which satisfies the following requirements as much as possible.

1 Ambient temperature is higher than 0°C and lower than 40°C. 2 A flat and dry floor. 3 A place as close to the air conditioner as possible.

2) Preparation of recovering cylinder

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

3) Connect to the power source

4) Preparations for air conditioner subjected to refrigerant recovery 1 When it is possible to run the air conditioner subjected to refrigerant recovery, perform pump down operation so that

refrigerant is contained in the outdoor unit (condenser side).

• Carry out the pump down operation after confirming the specification of the air conditioner subjected to refrigerant

recovery.

2 If there is any clogging part (ex. the electronic expansion valve, etc.), fully open such part.

Gauge manifold

Air conditioner

subjected to

recovery

(Intake

port)

Refrigerant recovering equipment

(Discharge

port)

Recovering cylinder

(iii) Connection of refrigerant recovering equipment

1) Connect the air conditioner subjected to refrigerant recovery to the refrigerant recovering equipment. 1 When there is a service port (port for recovery):

Make connection to the service port (port for recovery) by using a gauge manifold and charge hose.

2 When there is no service port (port for recovery):

Make connection in a manner similar to 1 above by using a piercing valve.

2) Connect the refrigerant recovering equipment to the recovering cylinder.

(iv) Recovering procedures

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

operate the equipment to recover refrigerant.

2) During the operation, take care of the following cautions. 1 Ascertain that the refrigerant recovering equipment is running as required and always monitor the state of operation so that

adequate steps can be taken in an emergency.

2 During the operation, remain at work site to ensure safety. 3 If you have to leave your work site for any unavoidable reason, stop the operation after ascertaining that the recovering

cylinder is not overcharged.

3) During the operation, if the refrigerant recovering equipment’s overcharging prevention mechanism operates and the equip-

ment stops automatically, replace the recovering cylinder with an empty one.

4) If the pressure gauge’s reading increases after a short time from the accomplishment of recovery and automatic stoppage of the

refrigerant recovering equipment, restart the equipment and, if it stops again, finish the recovery.

(v) Procedures after recovery

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

ing cylinder.

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

(b) Accessories/tools

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

Shown below are standard accessories.

(i) Recovering cylinder

• Use a recovering cylinder designated by the equipment manufacturer.

•A detachable cylinder must be such that it complies with the laws and regulations concerned.

• Do not use an ordinary cylinder as a recovering cylinder.

Note 1: A cylinder available when R410A was purchased, is a borrowed one.

Note 2: As a cylinder available when R410A was purchased, is provided with a check valve, it cannot be used as a recovering

cylinder.

•Types (by function)

Valve for liquid

Valve for gas

Liquid

•With a built-in float

Fig.8 Cylinder types

cylinder

(signal) for prevention of overcharging

Liquid

(a) Basic type

• 1-port valve

• Can be used for R410A recovery.

•Inverted when delivering liquid R410A.

Valve

Liquid

(b) 2-port valve type

• Capable of delivering liquid R410A or releasing gas in the upright position.

• Convenient for servicing.

• Caution

It is prohibited by law to recover R410A into a throw-away service can or one-way cylinder.

(ii) Drier

•A desiccant container for removing the water content of R410A.

•A drier should be prepared as expendables.

•Keep the drier sealed just before fitting it.

• Required to protect the R410A recovering equipment.

(iii) Connection hose

1) Charge port and charge port packing

• Usually, it is sold independently of a refrigerant cylinder.

• In the case of a two-port cylinder, the diameter may be special.

Inquire the manufacture for confirmation.

•A packing is expendables.

Valve for liquid the tube is inserted to a level close to the cylinder bottom.

Valve for gas (for gas releasing)

Signal line Float

}

Charge port

(c)

2) Charge hose (pressure resistant hose for fluorocarbon) and packing

• It is 1/4B in thickness and available in various lengths, etc.

• Use a hose whose pressure resisting performance is higher than 5.2 MPa (52 kg/cm

• Generally, a setting fixture is provided only on one end.

(iv) Gauge manifold

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

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

G).

Hose packing

Setting fixture

Compound gauge

Stop valve

Pressure gauge

Charge hose

Gauge manifold

(v) Tube piercing valve

1) A tool used to make a hole for recovery in the copper pipe when recovering R410A from equipment which has no port for

charging or recovering gas. Various types are available on the market and given various names.

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

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

(vi) Vacuum pump

Used to evacuate the recovering equipment and recovering cylinder.

Piercing pliers

Exhaust port

Piercing valve

Suction port

MODEL SRK22ZEV-S4

CONTENTS

2.1 GENERAL INFORMATION......................................................................... 61

(1) Specific features...................................................................................................... 61

(2) How to read the model name.................................................................................. 61

2.2 SELECTION DATA ..................................................................................... 62

(1) Specifications .......................................................................................................... 62

(2) Range of usage & limitations ................................................................................. 63

(3) Exterior dimensions ................................................................................................ 63

(4) Piping system .......................................................................................................... 64

(5) Selection chart......................................................................................................... 65

2.3 ELECTRICAL DATA ................................................................................... 66

(1) Electrical wiring ....................................................................................................... 66

2.4 OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER .............. 67

(1) Operation control function by remote control switch .......................................... 67

(2) Unit ON/OFF button................................................................................................. 69

(3) Power blackout auto restart function .................................................................... 69

(4) Custom cord switching procedure ........................................................................ 70

(5) Flap and louver control........................................................................................... 70

(6) Comfortable timer setting....................................................................................... 71

(7) Sleep timer operation.............................................................................................. 71

(8) Outline of heating operation................................................................................... 72

(9) Outline of cooling operation................................................................................... 75

(10) Outline of dehumidifying operation ....................................................................... 76

(11) Outline of automatic operation .............................................................................. 77

(12) Outline of fan operation .......................................................................................... 78

(13) Outline of clean operation ...................................................................................... 78

(14) Outline of allergen clear operation ........................................................................ 78

(15) ECONOMY operation .............................................................................................. 80

(16) External control (remote display)/control of input signal .................................... 80

(17) Operation permission/prohibition control ............................................................ 81

(18) Protective control function ..................................................................................... 82

2.5 APPLICATION DATA .................................................................................. 89

(1) Selection of location for installation...................................................................... 90

(2) Installation of indoor unit ....................................................................................... 91

(3) Installation of outdoor unit ..................................................................................... 94

(4) Refrigerant piping ................................................................................................... 94

(5) Test run ..................................................................................................................... 95

(6) Precautions for wireless remote control installation and

operation .................................................................................................................. 97

(7) Installation of wired remote control and super link adapter

(SC-AD-E) (Optional parts) ..................................................................................... 98

2.6 MAINTENANCE DATA ............................................................................... 105

(1) Troubleshooting procedures for electrical equipment ........................................ 105

(2) Servicing .................................................................................................................. 124

2.7 REFRIGERANT PIPING INSTALLATION/SERVICING MANUAL

FOR AIR CONDITIONERS USING R410A ................................................ 124

2.1 GENERAL INFORMATION

(1) Specific features

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

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

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

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

¡ Heating/Cooling

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

fans controlled to changes in frequency, thus controlling the power.

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

unit has stabilized.

(b) Fuzzy control

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

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

The Flap & louver can be automatically controlled by operating wireless remote control.

¡Flap swing : The flaps swing up and down successively. ¡Louver swing : The louvers swing left and right successively. ¡Multi-directional Air Flow : Activating both up/down air swing and left/right air swing at the same time results in a multi-

directional air flow.

¡Memory flap : Once the Flap & louver position is set, the unit memorizes the position and continues to operate

at the same position from the next time.

(d) Self diagnosis function

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

follows.

RUN light

TIMER light

1 time flash

2 time flash

6 time flash

Heat exchanger sensor error

Room temperature sensor error

Indoor fan motor error

(2) How to read the model name

Example : SR K 22 Z EV - S4

1 time flash

RUN light keeps flashing

RUN light

2 time flash

4 time flash

1 time flash

2 time flash

3 time flash

5 time flash

6 time flash

7 time flash

2 time flash

R410A models

Series No.

Inverter type

Product capacity

Wall mounted type

Split type room air-conditioner

Outdoor temperature sensor error

Outdoor heat exchanger sensor error

Discharge pipe temp. sensor error

Current cut

Trouble of outdoor unit

Over current

Over heat of compressor

Error of signal transmission

Outdoor fan motor error

Rotor lock

2.2 SELECTION DATA

(1) Specifications

Model SRK22ZEV-S4 (Indoor unit)

Item Cooling capacity Heating capacity Power source 1 Phase, 220V, 50Hz

(1)

Operation data

Exterior dimensions

Height × Width × Depth

Color Yellowish white Stucco white Net weight kg 15 59 Refrigerant equipment

Compressor type & Q’ty

Heat exchanger Slit fins & inner grooved tubing Straight fin & inner grooved tubing Refrigerant control Capillary tubes + Electronic expansion valve Refrigerant Refrigerant oil R 0.67 (MEL56) Deice control Microcomputer control

Air handling equipment

Fan type & Q’ty

Air flow (at High)

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

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

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

Safety equipment

Refrigerant

piping

Drain hose Connectable Power source supply Terminal block (Screw fixing type)

Connection wiring

Accessories (included) Optional parts Wired-Remote control

SRC22ZEV-S4 (Outdoor unit)

Model

(1)

Cooling input kW 1.84 Running current (Cooling) A 8.4 Heating input kW 1.86 Running current (Heating) A 8.5 Inrush current A 8.5 COP Cooling: 3.42 Heating: 3.82

Noise level

Power level 59 63

Motor kW – 1.3 Starting method – Line starting

(3)

Motor W 46 86

O.D mm (in) Liquid line: φ6.35 (1/4″) Gas line: φ15.88 (5/8″) Connecting method Flare connecting Attached length of piping Liquid line: 0.70m

Insulation Necessary (Both sides)

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

Operation DB WB DB WB

The piping length is 7.5m.

(2) The operation data are applied to 220V destricts respecitively. (3) The refrigerant quantity to be charged includes the refrigerant in 15 m connecting piping.

(Purging is not required even for the short piping.) If the piping length is longer, when it is 15 to 30 m, add 25g refrigerant per meter.

Sound level Hi 43, Me 39, Lo 33, ULo 26 47

Cooling

Power level

Sound level Hi 44, Me 38, Lo 32, ULo 27 48

Heating

(Cooling) 18.5 46 (Heating)

Size × Core number 1.5 mm2 × 4 cores (Including earth cable) Connecting method Terminal block (Screw fixing type)

Item Indoor air temperature Outdoor air temperature

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

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

W 6300 (900~7100) W 7100 (900~9000)

kg R410A 1.9 (Pre-Charged up to the piping length of 15m)

CMM

Mounting kit, Clean filter (Allergen clear filter × 1, Photocatalytic washable deodorizing filter × 1)

SRK22ZEV-S4 SRC22ZEV-S4

58 62

318 × 1098 × 248 750 × 880 × 340

– TNB220FLBM1 (Twin rotary type) × 1

Tangential fan × 1 Propeller fan × 1

21 46

Wireless-Remote control –

Gas line : 0.63m

(220V)

–

Standards

(2) Range of usage & limitations

Indoor return air temperature (Upper, lower limits)

Refrigerant line (one way) length Max. 30m

SRK22ZEV-S4

Cooling operation: Approximately 18 to 32°C Heating operation: Approximately 15 to 30°C

Cooling operation: Approximately -15 to 46°C Heating operation: Approximately -15 to 21°C

Power source voltage Rating ± 10%

Voltage at starting Min. 85% of rating

Frequency of ON-OFF cycle Max. 7 times/h (Inching prevention 5 minutes)

ON and OFF interval Max. 3 minutes

Outdoor air temperature (Upper, lower limits)

Vertical height difference between outdoor unit and indoor unit

Max. 20m (Outdoor unit is higher) Max. 20m (Outdoor unit is lower)

Item

Model

VIEW A

17.360

150

43.5

489

Piping hole right (left)

248

19 51.2

Terminal block

1090

Unit: mm

318

44.5

7.7

299

106

8.5301.8

Installation board

450

Piping for Gas (ø15.88) 633.5

44.5

53.5

106

49.5

349

886

221.547

Indoor unit

1098

Piping for Liquid (ø6.35) 703.5

Drain hose 772 (ø16)

Piping hole (ø65)

(3) Exterior dimensions

(a) Indoor unit

Model SRK22ZEV-S4

(b) Outdoor unit

Terminal block

Service valve (Gas) Flare fitting ø15.88 (5/8")

Service valve (Liquid) Flare fitting ø6.35 (1/4")

25.1165.5

30°

48.5103.3

750

24.1

Drain holes

2-ø15

25.8

29.8

87.9880

150580150

532

223

340

61 47.5

19 380 19

418

Outdoor unitIndoor unit

Heat exchanger

Room temp. sensor

Humidity sensor

Heat exchanger

Flare connecting

Heat exchanger sensor

Piping (Liquid) ø6.35

Piping (Gas) ø15.88

Check joint

4 way valve

Service valve (Liquid)

Flare connecting

Discharge pipe temp. sensor

Cooling cycle

Heating cycle

Outdoor air temp. sensor

Heat exchanger sensor

Compressor

uffler

Capillary tube

Strainer Strainer

accumulator

Accumulator

Sub

Service valve (Gas)

Electronic expansion valve

Model SRC22ZEV-S4

Unit: mm

(4) Piping system

Model SRK22ZEV-S4

(5) Selection chart

Cooling

Heating

2220181614

0.6

0.7

0.8

0.9

1.0

1.2

1.1

1.3

-5

-10

-15

Applicable range

Depends on installed situation

Outdoor air W.B. temperature ˚C W.B.

-15 -10 -5 0 5 10 15

Indoor air W.B. temperature ˚C W.B.

ISO-T1 Standard Condition

Cooling operation

Outdoor air D.B.

temperature

˚CD. B.

Coefficient of cooling

Heating capacity in

relation to temperature

Heating operation

Indoor air D.B.

temperature

˚CD. B.

ISO-T1 Standard Condition

Piping length [m]

Cooling

Heating

1.0

0.99

1.0

0.975

1.0

0.965

1.0

0.95

1.0

0.935

1.0

Air inlet temperature of

outdoor unit in ˚C WB

Adjustment coefficient

-10

0.95-90.94-70.93-50.91-30.88-10.8610.8730.9251.00

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

obtained in the following way.

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

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

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

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

units

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

outdoor heat exchanger.

How to obtain the cooling and heating capacity

Example : The net cooling capacity of the model SRK22ZEV-S4 with the piping length of 15m, indoor wet-bulb temperature at

19.0˚C and outdoor dry-bulb temperature 35˚C is Net cooling capacity = 6300 ✕ 0.975 ✕ 1.0 = 6143W

SRK22ZEV-S4 Length 15m

Factor by air temperatures

2.3 ELECTRICAL DATA

(1) Electrical wiring

Model SRK22ZEV-S4

Heat

Y/GN

R-AMP

Wireless

Display

Y/GN

Indoor unit Outdoor unit

2/N

Y/GN

R/LS/N

exchanger

ZNR

F 250V

3.15A

Terminal block

TB TB

To wired

remote control (option)

Power Source 1 Phase 220V 50Hz

N-1

CNI

Y/G

CNO

CNG

CNH

CNG

CNH

G3G2

Y/G

AF_L1

AF_L2

AC.LAC.N

L-1

F 250V 20A

20S

FMo

CNB

CND

CNJ

CNT

Th6

Th5

Th4

EEV

PWB2 (POWER)

PWB1 (MAIN)

CNG

PWB3 (CAPACITOR)

DC-P

DC-N

P_1

N_1

P_1

N_1

board

Printed circuit

CNE CNF

CNU

CNM

CNX

CNY

CNT

JEM-A

Option

CNB

XR1

XR2

XR3

XR4

XR5

CNG

LM1

LM2

Th3Th2Th1

Color symbol

Meaning of marks Symbol

Parts name Symbol Parts name Symbol Parts name

BK BL OR

Y/G

Black Blue Orange

Yellow/Green

White

Red

Green

Yellow

CM F FM

SM LM

1,2

Compressor motor Fuse Fan motor(Indoor) Fan motor(Outdoor) Flap motor Louver motor Room temp.sensor Heat exch.sensor(Indoor unit)

ZNR 20S EEV DS

Humidity sensor Heat exch.sensor(Outdoor unit) Outdoor air temp.sensor Discharge pipe temp.sensor Varistor 4 way valve(coil) Electronic expansion valve Diode stack

L RL XR1 XR2 XR3 XR4 XR5

Inductor Inspection lamp Operation indication (DC12) Heating indication (DC12) ON indication for CM(DC12) Check indication (DC12) Distant operation

2.4

OUTLINE OF OPERATION CONTROL BY MICROCOMPUTER

(1) Operation control function by remote control switch

(a) Wireless remote control

Model SRK22ZEV-S4

S Operation section

FAN SPEED button

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

HI POWER/ECONO button

This button changes the HIGH POWER/ ECONOMY mode.

ALLERGEN button

This button selects ALLERGEN CLEAR operation.

TEMPERATURE button

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

TIMER time.)

SLEEP button

This button changes to SLEEP operation.

CLEAN switch

This switch changes the CLEAN mode.

ON TIMER button

This button selects ON TIMER operation.

• The above illustration shows all controls, but in practice

only the relevant parts are shown.

OPERATION MODE select button

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

ON/OFF (luminous) button

Press for starting operation, press again for stopping.

AIR FLOW (UP/DOWN) button

This button changes the flow (up/down) mode.

AIR FLOW (LEFT/RIGHT) button

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

CANCEL button

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

OFF TIMER button

This button selects OFF TIMER operation.

RESET switch

Switch for resetting microcomputer.

TIME SET UP switch

Switch for setting the time.

S Indication section

SLEEP indicator

Indicates during SLEEP operation.

TEMPERATURE indicator

Indicates set temperature. (Does not indicate temperature when operation

mode is on AUTO)

FAN SPEED indicator

Indicates set air flow rate with lamp.

ALLERGEN CLEAR indicator

Indicates during ALLERGEN CLEAR operation.

CLEAN indicator

Indicates during CLEAN operation.

ON/OFF TIMER indicator

Indicates during ON/OFF TIMER operation.

OPERATION MODE indicator

Indicates selected operation with lamp.

(Auto) • (Cool) • (Heat) • (Dry) •

[

(Fan) ]

TIME indicator

Indicates present time or timer setting time.

AIR FLOW indicator

Shows selected flap and louver mode.

HI POWER/ECONO MODE indicator

Indicates during HIGH POWER/ECONOMY mode operation.

(b) Wired remote control (Optional parts)

Weekly timer display

Displays the settings of the weekly timer.

[Vent Indicator]

Indicates operation in the Ventilation mode.

Operation/Stop switch

This switch is used to operate and stop the air conditioning system. Press the switch once to operate the system and press it once again to stop the system.

MODE switch

This switch is used to switch between operation modes. (The clean operation or allergen clear operation cannot be selected.)

Operation setting display area

Displays setting temperature, airflow volume, operation mode and operation message.

Operation/Check indicator light

During operation: Lit in green In case of error: Flashing in red

FAN SPEED switch

This switch is used to set the airflow volume. (AUTO, ULO, HI POWER or ECONO cannot be selected.)

SET switch

This switch is used to apply the timer operation setting. This switch is also used to make silent mode operation settings.

[RESET switch]

Press this switch while making settings to go back to the previous operation. This switch is also used to reset the

FILTER CLEANING message display.

(Press this switch after cleaning the air filter.)

Central control display

Displayed when the air conditioning system is controlled by the option controller.

Timer operation display

Displays the settings related to timer operation.

AIR CON No. (Air conditioning system No.) switch

Displays the number of the connected air conditioning system. ("00" appears.)

[CHECK switch]

This switch is used at servicing.

[TEST switch]

This switch is used during test operation.

Temperature setting switches

These switches are used to set

the temperature of the room.

VENT switch

Switch that operates the connected ventilator.

Timer setting switches

These switches are used to set the timer mode and time.

TIMER switch

This switch is used to select a timer mode. (The comfortable timer or sleep operation cannot be selected.)

[GRILL switch]

This switch has no function. When this switch is pressed, (Invalid Operation) is displayed, but it does not mean a failure.

LOUVER switch

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

* If you oress any of the switches above and INVALID OPER is display, the switch has no function. But it does not mean a failure.

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.

Note (1) The SRK models don't support the switches and functions displayed in [ ].

Pull the cover downward to open it.

Model SRK22ZEV-S4

RUN (HOT KEEP) light (green)

• Illuminates during operation.

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

TIMER light (yellow)

Illuminates during TIMER operation.

HI POWER light (green)

Illuminates during HIGH POWER operation.

ECONO light (orange)

Illuminates during ECONOMY operation.

(2) Unit ON/OFF button

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

unit on and off.

(a) Operation

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

(b) Details of operation

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

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

Function

Operation mode

Cooling About 24ºC

Thermal dry About 24ºC Auto Auto Continuous

Heating About 26ºC

Room temperature

setting

Fan speed Flap

Timer switch

Unit ON/OFF button

(3) Power blackout auto restart function

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

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

(b) The following settings will be cancelled:

(i) Timer settings

(ii) High-power operations

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

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

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

timer.

(3)

If the jumper wire (J7) “AUTO RESTART” is cut, auto restart is disabled. (See the diagram at right)

Jumper wire (J7)

EXTERNAL INPUT

WIRED REMOCON

OPE PERMISSION CUSTOM

AUTO RESTART

LO TEMP

DIRT PREVENT

COOL ONLY

HI CEIL PANEL

50/60

(4) Custom cord switching procedure

If two wireless remote controls are installed in one room, in order to prevent wrong

operation due to mixed signals, please modify the printed circuit board in the indoor

unit’s control box and the remote control using the following procedure. Be sure to

modify both boards. If only one board is modified, receiving (and operation) cannot

be done.

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

Take out the printed circuit board from the control box and cut off jumper wire (J4)

using wire cutters.

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

(b) Modifying the wireless remote control

1) Remove the battery.

2) Cut the jumper wire shown in the figure at right.

Cut

(5) Flap and louver control

Control the flap and louver by AIRFLOW

(a) (i) Swing flap

Flap moves in upward and downward directions continuously.

(ii) Swing louver

Louver moves in left and right directions continuously.

(iii) When not operating

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

(b) Multi-directional Air Flow (up/down air and left/right air scroll)

Activating both up/down air swing and left/right air swing at the same time results in a multi-directional air flow.



(UP/DOWN) and



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



Jumper wire (J4)

Up/down air scroll

In COOL, DRY and FAN operation

Stops at this position for 5 seconds.

Thick line : moves quickly Thin line : moves slowly

Stops at this position for 5 seconds.

Left/right air scroll

In COOL, DRY and FAN operationIn HEAT operation

Left louver Right louver

In HEAT operation

When you press the AIRFLOW (UP/DOWN or LEFT/RIGHT) button once while the flap or louver is operating, it stops swinging

at an angle. Since this angle is memorized in the microcomputer, the flap or louver will automatically be set at this angle when the

next operation is started.

¡ Recommendable stopping angle of the flap

HEAT

Slant forward blowing

COOL•DRY

Horizontal blowing

(6) Comfortable timer setting

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

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

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

(Max. 60 minutes)

Operation mode Operation start time correction value (Min.)

At cooling

At heating

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

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

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

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

time.

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

+5 No change –5

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

+5 No change –5

< =

(Example) Heating

Setting temperature

Room temperature

Operation starting time

Time

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

Setting time

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

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

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

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

↑↑

Current operation Correction value start time

(7) Sleep timer operation

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

Cooling, DRY

Temperature setting (˚C)

Timer operation (time)

-1.0

1.0

0 1.0 2.0

Start

Heating

Temperature setting (˚C)

Timer operation (time)

-1.0

-2.0

-3.0

-6.0

0 0.5 1.0 2.0

Start

(8) Outline of heating operation

(a) Operation of major functional components in heating mode

Item

Functional components

Indoor fan motor ON ON OFF

Flap and louver ON or OFF ON or OFF Stop position control

Display Lights up Lights up Lights up or flashes

Outdoor fan motor ON

4-way valve Depending on the stop mode ON Depending on the stop mode

Electronic expansion valve Depending on the EEV control

(b) Air flow selection

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

Air flow selection

Auto

MED

ULO

Inverter command speed 12~88rps

Air flow Depends on inverter command speed.

Inverter command speed 12~88rps

Air flow 9th speed fixed

Inverter command speed 12~88rps

Air flow 7th speed fixed

Inverter command speed 12~74rps

Air flow 5th speed fixed

Inverter command speed 12~40rps

Air flow 3rd speed fixed

When the inverter

speed is 0rps

Model

When the inverter speed

is other than 0rps

SRK22ZEV-S4

When the inverter speed is 0rps

due to an anomalous stop

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

(iii) Outdoor unit blower operates in accordance with the inverter command speed.

(i) Fuzzy operation

Deviation between the room temperature setting correction temperature and the suction air temperature is calculated in

accordance with the fuzzy rule, and used for control of the air capacity and the inverter command speed.

(ii) Heating thermostat operation

¡ Operating conditions

If the inverter command speed obtained with the fuzzy calculation drops below -24 rps during the heating fuzzy operation,

the operation changes to the heating thermostat operation.

¡ Detail of operation

Model

Item

Inverter command speed 0rps [Comp. stopped] Indoor fan motor Hot keep N or M mode → 1st speed

Outdoor fan motor Stop

Flap and louver Horizontal, center

SRK22ZEV-S4

OFF

Indoor fan speed

A B

26 27 28 29.5 31.5 33 34.5 36 37.5 39 40.5 42

OFF

Indoor fan speed

A B

26 27 28 29.5 31.5 33 35.5 38 40.5 43 45.5 48

(iii) Hot keep operation

¡ Hot keep N mode (Air flow: HI, MED, LO, ULO)

¡ Values of A, B

At 0 rps command 22 25

Other than 0 rps command

10 15

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

Indoor heat exchanger temp. (˚C)

¡ Hot keep M mode (Air flow: AUTO, HIGH POWER, ECONOMY)

Indoor heat exchanger temp. (˚C)

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

(d) Defrosting operation

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

1) 1 After start of heating operation → When it elapsed 45 minutes.(Accumulated compressor operation time)

2 After end of defrosting operation → When it elapsed 45 minutes.(Accumulated compressor operation time) 3 Outdoor unit heat exchanger sensor (Th4) temperature → When the temperature has been below –5ºC for 3

minutes continuously.

4 ¡ The outdoor air temperature

The difference between the outdoor air temperature sensor temperature and the outdoor heat exchanger

temperature sensor temperature is

¡ The outdoor air temperature < –17°C

2) In addition, when the inverter command speed from the indoor controller of the indoor unit during heating operation

3) 1 After start of heating operation → Less than 45 minutes.(Accumulated compressor operation time)

The difference between the outdoor air temperature sensor temperature and the outdoor heat exchanger

temperature sensor temperature is

5 During continuous compressor operation (Defrost operations shall not be performed from 10 minutes after the

compressor begins running.)

has counted 0 rps 10 times or more and all conditions of 1, 2, 3 and 5 above and when the outdoor air temperature is 3°C or less are satisfied (note that when the temperature for Th4 is -5°C or less: 30 rps or more, -4°C or less: less than 30 rps), After running at an inverter command speed of 40rps for 7 minutes, defrost operations will start.

2 After end of defrosting operation → Less than 45 minutes.(Accumulated compressor operation time) 3 Outdoor unit heat exchanger sensor (Th4) temperature → When the temperature has been below –5ºC for 3

minutes continuously.

4 ¡ The outdoor air temperature

The difference between the outdoor air temperature sensor temperature and the outdoor heat exchanger

temperature sensor temperature is

¡ The outdoor air temperature < –17°C

The difference between the outdoor air temperature sensor temperature and the outdoor heat exchanger

temperature sensor temperature is

5 During continuous compressor operation (Defrost operations shall not be performed from 10 minutes after the

compressor begins running.)

–17°C

7ºC.

–5ºC.

20ºC.

15ºC.

¡ Values of A, B

At 0 rps command 22 25

Other than 0 rps command

10 15

indoor unit

Hot keep

120sec.120sec.

40sec. 40sec.

Final defrost operation

Defrost operation

(1)

Defrost end (Th4 15°C ,10 min.)

Hot keep

outdoor unit

Indoor fan

motor

Outdoor fan

motor

4-way valve

RUN light

Inverter

command

OFF

Corresponding

to speed

OFF

Corresponding

to speed

Defrost operation

preparation

Normal heating operation restored

Flashing

(Hot keep)

Fuzzy calculated

value

70rps

(ii) Operation of functional components during defrosting operation

Note (1) When outdoor unit heat exchanger sensor (Th4) temperature becomes 2°C or higher, inverter command changes 70 rps to 40 rps.

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

1 Outdoor heat exchanger sensor (Th4) temperature: 15ºC or higher 2 Continued operation time of defrosting → For more than 10 min.

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

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

¡ Detail of operation

Model

Item

Inverter command speed 88 rps

Indoor fan motor Hot keep M mode (max 10th speed)

Outdoor fan motor 6th speed

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

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

SRK22ZEV-S4

(9) Outline of cooling operation

(a) Operation of major functional components in Cooling mode

Item

Functional components

Indoor fan ON ON OFF

Flap and louver ON or OFF ON or OFF Stop position control

Display Lights up Lights up Lights up or flashes

Outdoor fan motor ON

4-way valve Depending on the stop mode OFF Depending on the stop mode

Electronic expansion valve Depending on the EEV control

(b) Air flow selection

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

Air flow selection

Auto

MED

ULO

Inverter command speed 12~64rps

Air flow Depends on inverter command speed.

Inverter command speed 12~64rps

Air flow 8th speed fixed

Inverter command speed 12~54rps

Air flow 6th speed fixed

Inverter command speed 12~40rps

Air flow 4th speed fixed

Inverter command speed 12~30rps

Air flow 2nd speed fixed

When the inverter

speed is 0rps

Model

When the inverter speed

is other than 0rps

SRK22ZEV-S4

When the inverter speed is 0rps

due to an anomalous stop

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

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

(i) Fuzzy operation

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

the room temperature setting correction temperature and the suction air temperature.

(ii) Cooling thermostat operation

1) Operating conditions

During the cooling fuzzy operation or when the inverter command speed obtained by the fuzzy calculation is less than -

24 rps.

2) Detail of operation

Model

Item

Inverter command speed 0 rps [Comp. stopped]

Indoor fan motor Corresponds to fan speed switch.

Outdoor fan motor Stop

SRK22ZEV-S4

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

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

1) Detail of operation

Model

Item

Inverter command speed 64 rps

Indoor fan motor 8th speed

Outdoor fan motor 6th speed

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

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

SRK22ZEV-S4

(10) Outline of dehumidifying operation

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

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

Heating oriented dehumidifying Cooling oriented dehumidifying

Low –3 High

Room temperature - Setting temperature (deg)

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

dehumidifying.

(b) Outline of control

(i) Cooling oriented dehumidifying

Room temperature and relative humidity is checked at 5-minute intervals after selecting the cooling or heating oriented

dehumidifying in order to determine the operation range.

Operation range

• Humidity sensor’s set values

Low humidity regions

Operation pattern

Inverter command speed

(rps)

Indoor fan motor

Outdoor fan motor

Determination of cooling oriented dehumidifying operation range

High humidity regions

Low humidity regions C (C) B (C) A (B)

55 70

Relative humidity (%)

A range B range C range D range E range F range I range

4th speed

5min.

I (I)

Low –1 0 +2 High

Room temperature – Setting temperature (deg)

2nd speed

3rd speed

5min.

2nd speed

3rd speed

5min.

F (F) E (F) D (E)

High humidity regions

4th speed

5th speed

5min.

3rd speed

4th speed

5min.

Note (1) Figures in the parentheses

( ) show the values at ECONOMY operation.

2nd speed

3rd speed

5min.

OFF

5min.

1st speed

25sec.

Temperature and humidity check

(ii) Heating oriented dehumidifying

4th speed

2nd speed 2nd speed

3rd speed 3rd speed

25 sec.

OFF

1st speed

27.5

25.5

19.5

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

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

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

of heating oriented dehumidifying operation within the (M) range.

Note (1) Figures in the parentheses

( ) show the values at ECONOMY operation.

Operation pattern

Operation range

Heating operation O range L range M range

(O) (L) (L)

O L M

Low –1 0 High

Room temperature – Setting temperature (deg)

Inverter command speed

Indoor fan motor

Outdoor fan motor

Determination of heating oriented dehumidifying operation range

(rps)

Depends on the operation condition

5 min. 5 min. 5 min.

Temperature check

(11) Outline of automatic operation

(a) Determination of operation mode

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

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

operation.

Cooling

Room temperature (˚C)

Dehumidifying

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

operation mode, changes the operation mode.

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

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

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

the wireless remote control and the setting temperature.

Setting

temperature

Cooling 18 19 20 21 22 23 24 25 26 27 28 29 30

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

Heating

Outdoor temperature (˚C)

–6 –5 –4 –3 –2 –1 ±0+1+2+3+4+5+6

Signals of wireless remote control (Display)

(12) Outline of fan operation

Inverter command speed

Indoor fan motor

Outdoor fan motor

Flap and louver

2nd speed 8th speed

0rps

OFF

Depend on the flap and louver control

6th speed 4th speed 2nd speed2nd speed

AUTO HI MED LO ULO ECONO

Functional components

Fan speed switching

Operation pattern2

Operation pattern1

Outdoor temperature (°C)

Room temperature (

After cooling operation, if (outdoor temperature-indoor temperature)

> =

9°C or

humidity sensor measures humidity

> =

70%

Fan operation 2 (42 min.)

After cooling operation, if (outdoor temperature-indoor temperature) < 9°C and humidity sensor measures humidity < 70% Heating cycle operation (42 min.)

Operation pattern2

Start

Allergen clear operations control (90 minutes)

End

Cooling

operation

(18 min.)

Standby

operation

(6 min.)

Complete stop Complete stop

Operation pattern1

Fan operation

(18 min.)

Fan operation1

(84 min.)

Start fan

operation

(6 min.)

(a) Operation of major functional components

(13) Outline of clean operation

COOL, DRY, AUTO (COOL, DRY); after operation has stopped, the moisture inside the dryer air conditioner, controls the production

of fungus etc.

(a) Operating condition

‘Clean’ is switched ON, when the air conditioner receives a STOP signal.

(b) Detail of operation

Inverter command speed 0 rps

Indoor fan motor 1st speed

Outdoor fan motor OFF

Flap and louver Fully closed

When control finishes 120 minutes after the Clean operation starts. When the stop signal is received from the remote control.

(14) Outline of allergen clear operation

(a) The start fan operation, and decision to the operation pattern.

Indoor fan speed at 2nd speed, outdoor fan speed at 4th speed for 6 minutes, measure room temperature and outdoor temperature,

decide to use operation Pattern 1 or operation Pattern 2 according to the conditions in the following diagram.

Inverter command speed 0

Indoor fan motor 2nd speed

Outdoor fan motor 4th speed

Flap and louver Horizontal, center

(b) Operation flow

(i) Fan operation1

42min.

TimeStop

Compressor operation

1) Operation content

Inverter command speed 0 rps

Indoor fan motor 1st speed

Outdoor fan motor OFF

Flap and louver Fully closed/ Center

(ii) Cooling operation

1) Operation content

Inverter command speed 20 rps

Indoor fan motor 2nd speed

Outdor fan motor 3rd speed

Flap and louver Horizoc/Center

4-way valve OFF

Note (1) During cooling operation safety control,frost

prevention control, and cooling overload protective control are generally not applicable

(iii) Heating cycle operation

1) Operation content

When the compressor is operating

Inverter command speed 20 rps 0 rps

Indoor fan motor OFF

Outdoor fan motor 3rd speed Determined by heating stop mode

Flap and louver Horizontal/ Center

4-way valve ON Determined by heating stop mode

2) Operation time

When the compressor is stopped

(Including protection stoppage)

After cooling operation

(outdoor temperature–indoor

temperature)

1 (Compressor operation time)

T2 (Compressor stopped time)

Heating operation control time (T1+T2)

–12°C

2430

–12°C~–10°C

2440

–10°C~–8°C

2450

–8°C~–6°C

2460

–6°C~–4°C

2470

42min.

–4°C~–2°C

2480

–2°C~0°C

2490

0°C~4°C

2500

(Sec.)

4°C~9°C

2510

(iv) Fan operation2 (v) Standby operation

1) Operation content 1) Operation content

Inverter command speed 0 rps

Indoor fan motor OFF

Outdoor fan motor 2nd speed

Flap and louver Fully closed/ Center

Inverter command speed 0 rps

Indoor fan motor OFF

Outdoor fan motor

Flap and louver Fully closed/ Center

Determined by stop mode

(15) ECONOMY operation (ECONO button on remote control: ON)

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

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

(b) Detail of operation

Model

Item

Operation mode Cooling Heating

Inverter command speed 12~46 rps 12~60 rps

Indoor fan motor 2nd, 4th speed 3rd, 5th speed

Outdoor fan motor 3rd~5th speed

SRK22ZEV-S4

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

Make sure to connect the wired remote control unit. Control of input signal is not available without the wired remote control unit.

(a) External control (remote display) output

Following output connectors (CNT) are provided on the printed circuit board of indoor unit.

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

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

(iii) Compressor ON output: Power to engage DC 12V relay (provided by the customer) is outputted while the compressor is

operating.

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

(b) Control of input signal

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

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

(i) If the factory settings (Jumper wire J1 EXTERNAL INPUT on the PCB) are set, or “LEVEL INPUT” is selected in the wired

remote control’s indoor unit settings.

1) Input signal to CnT OFF → ON Air conditioner ON

2) Input signal to CnT ON → OFF Air conditioner OFF

CnT Input

A Unit

B Unit

OFF

*ON

(ii) When Jumper wire J1 on the PCB of indoor unit is cut at the field or “PULSE INPUT” is selected in the wired remote

control’s indoor unit settings. Input signal to CnT becomes valid at OFF → ON only and the motion of air conditioner [ON/OFF] is inverted.

CnT Input

A Unit

B Unit

OFF

*ON

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

ON operation using the remote control unit switch, etc.

(17) Operation permission/prohibition control

The air conditioner operation is controlled by releasing the jumper wire (J3) on the indoor control board and inputting the

external signal into the CnT.

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

the indoor control board.

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.

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

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

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

(ii) When the CnT input is changed from OFF to ON, the air conditioner operation mode is changed depending on the status of

the jumper wire (J1) on the indoor control board.

When the jumper wire (J1) is short circuited

The signal (i) above starts the air conditioner. (Shipping

status)

When the jumper wire (J1) is released

When the CnT input is set to ON, the air conditioner

starts operation. After that, the operation of the air

conditioner depends on (i) above. (Local status)

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

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

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

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

(18) Protective control function

(a) Indoor fan motor protection

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

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

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

(b) Dew condensation prevention control [Cooling (including automatic), cooling oriented dehumidifying operation]

(i) Operating conditions: When all of the following conditions are met.

1 When the inverter command speed is higher than 20 rps, and the humidity sensor value is higher than 68% continuously

for more than 20 minutes.

2 Indoor heat exchanger temperature

(ii) Detail of operation:

1 Indoor heat exchanger temperature

The inverter command speed is reduced 4rps at each 20 seconds. Lower limit speed is 20 rps.

2 Room temperature –12ºC <Indoor heat exchanger temperature

The inverter command speed is maintained for 20 seconds.

3 When this control continues for more than 30 minutes, carry out air flow control.

a) Up/down air flow

When selecting other than Up/down swing or multi-directional air flow, compel flat orientation.

b) Left/right air flow

When selecting other than Left/right swing or multi-directional air flow, compel centralized orientation.

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

1 The humidity sensor value is less than 63%.

2 The inverter command speed is less than 20 rps.

3 Indoor heat exchanger temperature > Room temperature –8ºC.

The inverter command speed is raised by 1rps and kept at that speed for 20 seconds. This process is repeated until the

calculated speed is reached.

Room temperature –12ºC.

Room temperature –12ºC

Room temperature –8ºC

◆ < I >

(i) Operating conditions: After the inverter command speed is at a value other than 0 rps for ten minutes, when the indoor

heat exchanger temperature is less than 2.5°C.

(ii) Detail of operation

Inverter command speed 0rps

Indoor fan motor Depends on inverter command speed

Outdoor fan motor OFF

4-way valve OFF

2) If the indoor heat exchanger temperature reaches more than 8°C, the inverter command speed shall be limited to 50rps

to restart operation.

(iii) Reset conditions: Indoor heat exchanger temperature reaches more than 8°C, inverter command speed is at a value other

than 0rps for 10 minutes.

◆ < II >

(i) Operating conditions: When all of the following conditions are met.

1 After the inverter command speed is at a value other than 0 rps for 8 minutes, when the indoor heat exchanger temperature

is less than 5°C.

2 When the inverter command speed is more than 20 rps.

(ii) Detail of operation:

1 Indoor heat exchanger temperature

The inverter command speed is reduced 4rps at each 20 seconds. Lower limit speed is 20 rps.

2 5ºC <Indoor heat exchanger temperature

The inverter command speed is maintained for 20 seconds.

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

1 The inverter command speed is less than 20rps.

2 The indoor heat exchanger temperature is more than 8ºC.

The inverter command speed is raised by 1rps and kept at that speed for 20 seconds. This process is repeated until the

calculated speed is reached.

(d) Cooling overload protective control

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

outdoor air temperature sensor (Th5) becomes 41ºC or over for 30 seconds continuously.

(ii) Detail of operation

1) Outdoor fan is stepped up by 3 speed step. (Upper limit speed is 7th speed.)

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

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

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

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

2 When the inverter command speed is 0rps.

(e) Cooling low outdoor temperature protective control

◆ < I >

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

outdoor speed is other than 0rps.

(ii) Detail of operation: After the outdoor fan operates at 3rd speed for 60 seconds; the corresponding outdoor heat

exchanger temperature shall implement the following controls.

1 Outdoor heat exchanger temperature

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

lower than 22°C, gradually reduce the outdoor fan speed by 1 speed. (Lower limit speed is 1st speed)

2 22ºC < Outdoor heat exchanger temperature

After the outdoor fan speed maintains at 3rd speed for 20 seconds; if the outdoor heat exchanger temperature is 22°C~

40°C, maintain outdoor fan speed.

3 Outdoor heat exchanger tempeature > 40ºC

After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is higher than 40°C, gradually increase outdoor fan speed by 1 speed. (Upper limit speed is 3rd speed)

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

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

2 When the inverter command speed is 0rps.

5ºC

22ºC

8ºC

40ºC

22 25

OFF

Upper limit 50rps Lower limit 30rps

Upper limit 60rps Lower limit 20rps

Outdoor air temp.(°C)

◆ < II >

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

outdoor speed is other than 0rps.

(ii) Detail of operation:

1 The lower limit of inverter command speed is set to 20(30)rps and even if the speed becomes lower than 20(30)rps, the

speed is kept to 20(30)rps. However, when the thermo becomes OFF, the speed is reduced to 0rps.

2 The upper limit of control speed is set to 60(50)rps and even if the calculated result becomes higher than that after fuzzy

calculation, the speed is kept to 60(50)rps.

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

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

(f) High pressure control

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

(ii) Detector: Indoor heat exchanger sensor (Th2)

(iii) Detail of operation:

1 56ºC

Indoor heat exchanger temperature < 58°C

The inverter command speed is reduced 2rps at each 20 seconds. When the indoor unit heat exchanger temperature is 58°C or higher but less 61°C, the speed is reduced 4rps at each 20 seconds. The lower limit speed is 30rps. When the temperature is 61°C or higher for 1 minute continuously, the inverter is stopped.

2 48.5ºC

Indoor unit heat exchanger temperature < 56ºC

The inverter command speed is been maintained and the operation has continued for more than 20 seconds at the same

speed, it returns to the normal heating operation.

Note (1) Indoor fan retains the fan tap when it enters in the high pressure control. Outdoor fan is operated in accordance with the speed.

(iv) Reset conditions: When the indoor heat exchanger temperature is less than 48.5°C

The inverter command speed is raised by 1rps and kept at that speed for 20 seconds. This process is repeated until the

calculated speed is reached.

(g) Heating overload protective control

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

temperature sensor (Th5) rose beyond 22ºC for 30 seconds continuously.

(ii) Detail of operation:

1 Taking the upper limit of control speed range at 50 rps, if the output speed obtained with the fuzzy calculation exceeds the

upper limit, the upper limit value is maintained.

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

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

3 The outdoor fan is lowered forcibly by 1step. (Lower limit speed is 2nd speed.)

(iii) Reset conditions: When the outdoor air temperature drops below 21ºC.

(h) Heating low outdoor temperature protective control

-16

ON: 70rps

OFF

ON: 40rps

ON: 20rps

-18-20-25

Outdoor heat exchanger temp.(°C)

◆ < I > (i) Operating conditions: When the outdoor air temperature sensor (Th5) is 4°C or lower continues for 30 seconds while

outdoor speed is other than 0rps.

(ii) Detail of operation: When the inverter command speed is less than 20rps, the speed is forcibly set at 20rps. However,

when the thermo becomes OFF, the speed is reduced to 0rps.

(iii) Reset conditions: When the outdoor air temperature sensor (Th5) becomes 6°C or higher.

◆ < II > (i) Operating conditions: When the outdoor air temperature sensor (Th5) is 4°C or lower continues for 30 seconds while

outdoor speed is other than 0rps.

(ii) Detail of operation: Outdoor fan is stepped up by 2 speed step. (Upper limit 7th speed) (iii) Reset conditions: When the outdoor air temperature sensor (Th5) becomes 6°C or higher.

◆ < III >

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

exchanger temperature (Th4) is less than -18°C.

(ii) Detail of operation: The inverter command speed upper limit and corresponding outdoor heat exchanger temperature

are set as follows.

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

1 When the outdoor heat exchanger temperature (Th4) becomes -16°C or higher. 2 When the inverter command speed is 0rps.

(i) Compressor protection start

(i) When the indoor unit calculated speed is 30rps or over at operation start, the unit is operated with 30rps for 1 minute and 45

seconds. After that when the calculated speed is 38rps or over, the unit is operated with 38rps for 1minute and 15 seconds.

After that when the calculated speed is 46rps or over, the unit is operated with 46rps for 1minute. After that when the

calculated speed is 54rps or over,the unit is operated with 54rps for 1minute then moved to command speed.

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

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

Note (1) When the calculated speed is less than 30 rps, the unit is started with low load starting described in article (k).

(j) Inching prevention

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

operations, the operation is continued with the command speed of 12 rps forcibly.

(k) Low load starting

(i) When the unit is started with calculated speed of less than 20 rps, it is operated with 20 rps for 60 seconds, then the operation

is moved to the command speed.

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

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

Dehumidification: Speed decided in the operation region

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

(l) Freezing cycle system protective control

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

after the start of operation.

1) Inverter command speed is higher than 60 rps

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

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

(ii) Detail of operation: The inverter command speed repeats 30 minutes at 30rps↔2 minutes at 62 rps.

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

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

operation.

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

(i) Operating conditions: When inverter command speed of less than 20 rps continues for 60 minutes

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

outdoor fans are not changed.)

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

(n) Current cut

(i) Purpose: Inverter is protected from overcurrent.

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

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

minutes.

(o) Outdoor unit failure

This is a function for determining when there is trouble with the outdoor unit during air conditioning.

The compressor is stopped if any one of the following in item 1), 2) is satisfied. Once the unit is stopped by this function, it is not

restarted.

1) When the input current is measured at 1 A or less for 3 continuous minutes or more.

2) If the outdoor unit sends a 0 rps signal to the indoor unit 3 times or more within 20 minutes of the power being turned on.

(p) Current safe

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

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

of the outdoor unit and, if the operation current value reaches the limiting current value, the outdoor

unit speed is reduced.

If the mechanism is actuated when the speed of outdoor unit is less than 20 rps, the compressor is

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

(q) Power transistor overheat protection

(i) Purpose: In order to prevent the power transistor overheating during operation, faulty controller operations, deterioration,

damage and so on occurs.

(ii) Detail of operation:

1 Power transistor sensor temperature

110ºC

The compressor is stopped immediately. When the power transistor sensor temperature is less than 80°C, restart.

2 90ºC

Power transistor sensor temperature < 110ºC

The outdoor unit speed drops to 4 rps. After 20 seconds, the outdoor unit speed performs the following controls, according

to the power thansistor sensor temperature.

If the previous sensor temperature

If the previous sensor temperature > current sensor temperature reduce by 2rps

current sensor temperature reduce by 4rps

Cooling Heating

Lower limit speed 20rps 20rps

3 80ºC

Power transistor sensor temperature < 90ºC

Maintain the outdoor unit speed. When the rotation speed is the same for 6 minutes, or when the power transistor sensor temperature is less than 80°C. The speed is raised by 2rps and kept at that speed for 1 minute. This process is repeated

until the inverter command speed is reached.

(r) Compressor overheat protection

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

overheat.

(ii) Detail of operation

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

(Example) Fuzzy

After lapse of 3 min. or over

(3)

Lower limit speed 20rps

4 rps

(1)

4 rps

0 rps

90 100 110

Discharge pipe temperature (˚C)

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

(2) When the discharge pipe temperature is raised and continues operation for 20 seconds without changing, then the speed is reduced again by 4 rps. (3) If the discharge pipe temperature is still 90 ºC or greater but less than 100 ºC even when the inverter command speed is maintained for 3 minutes when

the temperature is 90 ºC or greater but less than 100 ºC, the speed is raised by 1 rps and kept at that speed for 3 minutes. This process is repeated until the calculated speed is reached.

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

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

there is no start at the third time.

(s) Serial signal transmission error protection

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

(ii) Detail of operation: If the compressor is operating and a serial signal cannot be received from the indoor control with

outdoor control having serial signals continuously for 1 minute and 55 seconds, the compressor is

stopped.

After the compressor has been stopped, it will be restarted after the compressor start delay if a serial

signal can be received again from the indoor control.

(RUN light: ON, TIMER light: 6 times flash)

(t) Compressor lock

Functional

components

Operation

Inverter command

speed

Decision

rps

EEV

control

Fully closed

0 rps

OFF

According to

outdoor rps

According to

indoor rps

OFF

Set location

OFF

Outdoor unit fun

Indoor unit fun

4-way valve

Flap

EEV

Cooling,cooling oriented dehumidifying

Heating,heating oriented dehumidifying

Cooling,cooling oriented dehumidifying

Heating,heating oriented dehumidifying

When the complete stop command is given,

when there is and abnormal stoppage command

When stoppage occurs due to thermostat operation,

switching operations and protective function operations

Stop instructions All stop Stop instructions All stop Stop instructions Restart Stop instructions Restart

1st speed

Hot keep

470 pulse

150 pulse

3 min. 3 min.

2 min.55 sec.

470 pulse

2 min.55 sec.

470 pulse

2 min.55 sec.

40 sec.

470 pulse

2 min.55 sec.

40 sec.

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.

(u) 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.

(v) Stop mode

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

heating oriented mode to the cooling oriented mode or vice versa, or when the inverter speed

turns to 0 rps. [When 0 rps is commanded from the indoor unit controller, or when an outdoor

protective function is actuated]

(ii) Detail of operation

2.5 APPLICATION DATA SAFETY PRECAUTIONS

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 20A) with a contact separation of at least 3mm.

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

ment such as engineering shop could cause equipment malfunction.

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

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

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

result in water leakage, electric shocks and fires.

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

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

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

¡ 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 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)

¡ 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.

CAUTION

(1) Selection of location for installation

5 cm

10 cm

1.5 cm

6.5 cm

(a) Indoor unit

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

air can be evenly distributed.

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

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

space mentioned below can be secured)

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

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

the sun or the strong rays of the street lighting.

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

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

(To prevent interfence to images and sound.)

(b) Outdoor unit

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

• A place where intake air temperature is over 46°C , it is desirable to install a roof avoiding the sunlight.

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

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

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

(v) 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.

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

Left side

Right side

100

Air inlet

Air outlet

100

600

No obstacles (Service space for electrical parts)

Unit : mm

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

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

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

prevented for keeping the normal performance capacity.

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

operation.

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

hood will not face directly into the most windy direction.

2) Design the base higher than possible snow deposit.

height difference.

Model Item One way piping length (R) 30 m

Outdoor Vertical height difference (h)

unit is lower

Outdoor unit

is higher

SRK22ZEV-S4

20 m

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.

above shall be secured.

Snow hood

Height: Must be over the possible snow deposit height

(2) Installation of indoor unit

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

610 450

INSTALLATION SPACE (INDOOR UNIT) (FRONT VIEW)

(a) Installation of installation board

(i) Fixing of installation board

Adjustment of the installation board in the horizontal

direction is to be conducted with four screws in a

temporary tightened state.

Standard hole

Adjust so that board will be level by turning the board

with the standard hole as the center.

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

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

(i) Drill a hole with ø65

whole core drill

Indoor side Outdoor side

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

indoor side to outdoor side.

(iii) Install the sleeve

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

Indoor side

Paste

Fixing on concrete wall

Use of nut anchor Use of bolt anchor

Bolt (M6 × 12)

Mounting board

Nut (M6)

Mounting board

(ii) Adjusting sleeve length

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.

View of sleeve when installed

Turn to tighten

Outdoor side

Sleeve

Indoor side Outdoor side

Max. 10

Inclined flange

Sealing plate

Wall thickness

+ 1.5 cm

(i) Mounting of connecting wires

1) Open the air inlet panel.

2) Remove the lid.

3) Remove the wiring clamp.

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

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

H Harmonized cable type

05 300/500 volts

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

4 Number of conductors

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

green)

1.5 Section of copper wire (mm2)

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

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

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

3 Affix the connection wire using the wiring clamp.

5) Fix the connecting wire by wiring clamp.

6) Attach the lid.

7) Close the air inlet panel.

(ii) Installing the support of piping

[Shaping the piping] [Taping of the exterior]

Terminal block

Wiring Clamp

Lid

Piping

Drain hose

¡ Hold the bottom of the piping and fix direction before

stretching it and shaping it.

¡ Tape only the portion that goes through the wall.

Always tape the crossover wiring with the piping.

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

[Top View]

Left-hand-sided-piping Right-hand-sided-piping

Piping in the left rear direction

Piping in the left direction

Piping in the right rear direction

Piping in the right direction

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

Right

Rear

Downward

Left rear

Left downward

Left

[Drain hose changing procedures]

1. Remove the drain hose.

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

¡Remove the drain hose,

making it rotate.

¡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.

Gutter

¡Insert the drain hose

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

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.

Pipe accommodation section

Drainage

¡ Arrange the drain hose in a downward angle. ¡ Avoid the following drain piping.

Odor from the gurtter

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.

insulated.

Shield pipe

When it is exposed indoor.Drain hose

(iii) Fixing of indoor unit

¡ 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.

Extended 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.

(3) Installation of outdoor unit

(a) Installation of outdoor unit

(i) Make sure that the unit is stable in installation. Fix the unit to stable base.

(ii) 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.

(iii) Perform wiring, making wire terminal numbers conform to terminal numbers of indoor nuit terminal block.

(iv) Connect using ground screw located near

(v) 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.)

mark.

Power supply cord CENELEC code for cables requiring field cables H05RNR3G2.5

(4) Refrigerant piping

(a) Preparation

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

Indoor unit side

(Do not

turn)

¡ Remove the flared nuts.

(on both liquid and gas sides)

Press

Remove

(b) Connection of refrigerant piping

Indoor unit side

¡ Connect firmly gas and liquid side

pipings by Torque wrench.

Spanner

(for fixing the piping)

Torque wrench

¡ Specified torquing value:

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

Gas side (ø15.88) : 68.0~82.0N·m (6.8~8.2kgf·m)

¡ Always use a Torque wrench and back up spanner to tighten

the flare nut.

Outdoor unit side

¡ Remove the flared nuts.

(on both liquid and gas sides)

Press

Remove

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

then flare the pipes.

Outdoor unit side

¡ Connect firmly gas and liquid side

pipings by Torque wrench.

¡ Specified torquing value:

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

Gas side (ø15.88) : 68.0~82.0N·m (6.8~8.2kgf·m)

¡ Use one more spanner to fix the valve.

Dimension A Liquid side (φ6.35): 9.1 mm Gas side (φ15.88): 19.7 mm

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)

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

MPa (– 76 cmHg). (iv) After completing vacuum operation, fully open service valve (Both gas and liquid sides) with hexagon headed wrench. (v) Detach the charge hoses. (vi) Check for possible leakage of gas in the connection parts of both indoor and outdoor.

¡ 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

Additional refrigerant charge

When refrigerant piping exceeds 15m conduct additional refrigerant charge by weight after refrigerant piping completion. Additional charge amount per meter = 25g/m

[Example]

How much amount of additional charge for 25m piping? (25 – 15)m × 25g/m = 250g 250g for additional charge

(d) Insulation of connecting portion

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

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

Vin yl tape

(ii) Finishing and fixing

1) Tie up the piping with wrapping tape, and shape it so that it conforms to which the pipe is attached.

2) Fix them with clamps as right figure.

(5) Test run

(a) Conduct trial run after confirming that there is no gas leaks. (b) When conducting trial run set the remote controller thermostat to continuous operation position. However when the power source

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

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

a burn out.

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

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

Insulation

Refrigerant piping

Electrical wiring

Covering tape

Drain hose

Tapping screw

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.

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

0.2

0.4

0.6

0.8

1.2

1.4

15 20 25 30 35 40 45 50

CAPACITY RATI O

Rated

0.5

0.6

0.7

0.8

0.9

1.1

1.2

1.3

1.4

-15 -10 -5 0 5 10 15 20 25

CAPACIT Y RATIO

Hi Me

ULo

HEATING CHARACTORISTICS

COOLING CHARACTARISTICS

INDOOR CONDITION: DB20°C

OUTDOOR DB TEMP.(°C)

INDOOR CONDITION: DB27°C/WB19°C

OUTDOOR DB TEMP.(°C)

(e) Make sure that drain flows properly.

(f) Standard operation data

Model

Item

High pressure (MPa)

Low pressure (MPa)

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

Running current (A)

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

Cooling –

Heating 2.5~2.7

Cooling 0.8~1.0

Heating –

Cooling 12~14

Heating 16~18

Cooling 8.4

Heating

SRK22ZEV-S4

8.5

(220V)

(6) Precautions for wireless remote control installation and operation

(a) Wireless remote control covers the following distances:

(i) When operating facing the air conditioner:

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.

Wireless remote control

5 m or less

or less

5 m or less

or less

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

receiver status.

(ii) When manipulating the remote control mounted on a wall:

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

is audible) before mounting.

Receiver

Remote control available in this area.

(7) Installation of wired remote control

SW12

SW13

SW14

J1 J2 J3 J4

WIRED REMOCON

SW12

J1 J2 J3 J4

WIRED REMOCON

and super link adapter (SC-AD-E) (Optional parts)

(a) Modifying the indoor unit’s printed circuit

board

(i) Remove the air inlet panel (Refer to the installa

tion directions).

(ii) Remove the front panel (Refer to the installa-

tion directions).

(iii) Remove the control box

• Remove the screw and the latch, and open the control lid.

(iv) Cut the jumper attached on the board.

• Remove the upper box. Remove the screw, the latch and the band.

Band

Latch

Screw

• Remove the flap connector, the louver connector, the fan motor connector, the earth and the sensor.

Sensor

Earth

Screw (Fixing the control box)

Control lid

Latch

Fan motor connector

Flap/Louver connector

• Cut the jumper (printed “WIRED REMOCON”) attached on the board. It is impossible to control by the wireless remote control after cutting the jumper.

Jumper (WIRED REMOCON)

• Install the upper box.

(v) Connect the wire

• Connect the wired remote control and super

link wire. (Please refer to the installation manual of attachment in wired remote control for details)

• Remove the screw fixing the control box.

• Remove the control box from the base . It is possible to remove the control box from the base by leaning the control box slightly to right-hand side and pulling it toward you.

Band

Each wire can be connected the left or right

terminal block.

(vi) Install the control box.

Be careful not to bite the wire.

(vii) Install the front panel.

(vii) Install the air inlet panel.

Notes (1) One remote control cannot control two or

more indoor units.

(2) To connect the super link, the optional SC-

AD-E (super link adapter) is required.

(b) Installation of wired remote control (Optional

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

Remote control switch

Remote control cord (Shielded wire)

Precation in Extending the Remote control cord

● The shielded wire should be grounded at one side only.

Within 100-200m

…………

Within 300m

…………

Within 400m

…………

Within 600m

…………

0.5 mm

0.75 mm

1.25 mm

2.0 mm

× 3 cores × 3 cores × 3 cores × 3 cores

Maximum total extension 600m.

▼

The cord should be a shielded wire.

● For all types : 0.3mm

× 3 cores

Note (1) Use cables up to 0.5mm

(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.

Indoor unit

Length of the section where a sheath is removed

parts)

(i) Selection of installation location

Avoid the following locations

1) Direct sunlight.

2) Close to heating device.

3) Highly humid or water splashing area.

4) Uneven surface.

(ii) Installation procedure

1) Exposed fiting a) Open the remote control case.

• Put a screw driver (flat-head) into the concavity made on the upper part of a remote control unit and twist it lightly to open the casing.

b) The cord of a remote control unit can only

be pulled out in the upward direction.

2) Recessed fitting a) The Electrical box and remote control (shield

wire must be use in case of extension) are first embedded.

• Cut off with nippers or a knife a thin walled part made on the upper end of the remote control unit’s bottom casing, and then remove burrs with a file or the like.

c) Fix the remote control unit’s bottom casing

onto a wall with two wood screws supplied as accessories.

d) 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) -

0.5mm2 (maximum) for a remote control unit cord. Remove a sheathe of the remote

control unit cord for the section laid within the remote control unit casing. The length of each wire that should be left after a sheath is removed is as follows:

Black: 195mm, White: 205mm, Red: 215mm e) Replace the top casing as before. f) Use a cord clamp to attach the remote con-

trol cord to the wall.

g) Set the functions according to the types of

in door unit. See Section “Function Setting’’.

b) Remove the upper case to the remote con-

trol.

c) 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.

d) Connect the remote cord to the remote con-

trol.

Refer to [Exposed Fitting].

e) Installation work is completed by replacing

the top casing onto the bottom casing as before.

f) Set the function switch according to the type

of the indoor unit.

Refer to [Function setting].

Mitsubishi Heavy Industries SRK13ZEV-S4, SRK22ZEV-S4 Technical Manual

Specifications and Main Features

Frequently Asked Questions

User Manual