Haier H2SM Series, H2SM-(9+12)H03/R2 Service Manual

SERVICE MANUAL

Air Conditioners

CAUTION

READ THIS MANUAL CAREFULLY TO
DIAGNOSE TROUBLE CORRECTLY
BEFORE OFFERING SERVICE .

MODEL: H2SM-(9+12)H03/R2

THIS MANUAL IS USED BY

QUALIFIED APPLIANCE

TECHNICIANS ONLY. HAIER

DOES NOT ASSUME ANY

RESPONSIBILITY FOR PROPERTY

DAMAGE OR PERSONAL INJURY

FOR IMPROPER SERVICE

PROCEDURES DONE BY ONE

UNQUALIFIED PERSON.

Air Conditioner

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Edition:2006/1/10

Air Conditioner

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Edition:2006/1/10

IMPORTANT INFORMATION

ƽҏFeatures

ƽҏComfortable: wide-angle airflow

ƽhealth air purifying

ƽquiet operation

ƽҏsuper energy efficient

ƽMain Specification

ƽCooling CapacityΚ 2900/3300/5800W

ƽRated Power/Current(cooling)Κ960/1020/2050W/4.6/4.8/9.0A

ƽEER: 3.02/3.23/2.82W/W

ƽHeating CapacityΚ 2800/3300/6000W

ƽRated Power/Current(heating): 900/980/1760W/4.5/4.6/8.0A

ƽCOP: 3.11/3.36/3.4

ƽAir Volume(Indoor): 400/500m

3

/h

ƽPower: 1PH 220-230V~ 50 Hz

MODEL: H2SM-(9+12)H03/R2

Air Conditioner

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Edition:2006/1/10

Safety Information

General Information

This Service Manual describes the operation,disassembly,troubleshooting,and repair of Haier Room Air

Conditioners,etc. It is intended for use by authorized servicers who troubleshoot and repair these units.

NOTE:It is assumed that users of this manual are familiar with the use of tools and e quipment used to

troubleshoot and repair electrical,mechanical,and refrigeration systems;and understand the terminology

used to describe and discuss them.

Haier urges you read and follow all safety precautions and warnings contained in this manual. Failure

to comply with safety information may result in severe personal injury or death.

Related Publications

This is a base service manual,covering a range of similar models.It is intended to be used in

conjunction with the Parts Manual and Technical Sheet c overing s pecific model being serviced.

General Precautions and Warnings

WARNING

To avoid risk of personal injury or death due to electrical shock,disconnect electrical power to unit

before attempting to service the unit.

WARNING

To avoid risk of personal injury or death due to electrical shock,DO NOT,under any circumstances,alter

the grounding plug .Air conditioner must be grounded at all times.Do not remove warning tag from power

cord.If a two-prong (non-grounding) wall receptacle is encountered,contact a qualified electrician and

have the receptacle replaced with a properly grounder wall receptacle in accordance with the National

Electrical Code.

WARNING

To avoid risk of personal injury or death due to electrical shock,grounding wires and wires colored like

groundi ng wires are NOT to be used as current carrying conductors.The standard accepted color coding

for ground wires is green or green with a yellow stripe.Electrical components such as the compressor

and fan motor are grounded through an individual wire attached to the electrical component and to

another part of the air conditioner.Groundi ng wires should not to be removed from individual components

while servicing,unless the component is to be removed and replaced.It is extremely important to replace

all removed grounding wires before completing service.

WARNING

To avoid risk of heat exposure,which may cause death or severe illness,air conditioner must be

monitored when malf unctions or shuts down.

CONTENTS

1. SPECIFICATION....................................1

２．　ＥＬＥＣＴＲＩＣＡＬ　ＣＯＮＴＲＯＬ．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．３
３

．　ＴＲＯＵＢＬＥ　ＳＨＯＯＴＩＮＧ．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．２７

４

．　ＩＮＳＴＡＬＬＡ　ＴＩＯＮ．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．．３２　

５

．　ＣＩＲＣＵＩＴ　ＡＮＤ　ＷＩＲＩＮＧ　ＤＩＡＧＲＡＭ．．．．．．．．．．．．．．．．．．．．．．．４２

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SPECIFICATION

1

Model˖

H2SM-(9+12)H03/R2

Brand Mark˖

-----

Cooling Capacity˖

2900/3300/5800W

Frequency Range˖

50Hz

Rated Power/Current˖

960/1020/2050W/9.0A

Power

1PH 220-230V~ 50 Hz

Max Power/Current˖

2400W/12.4A

Cooling

EE

R 3.02/3.23/2.82W/W

Model×Sectional Area˖

--------

Heating Capacity˖

2800/3300/6000W

Power Cord

Refer. No.˖ --------

Rated Power/Current˖

900/980/1760W/8.0A

Compressor

manufacturer/Type

Max Power/Current˖　　　　　　　　　2520W/

13.0A

Heating

COP 3.11/3.36/3.40

Compressor

Oilcharge

Power/Current of

Electric Heating˖

----- Type/NetCharge˖

R410A

Operating temp. range -7OC-43OC

Additional Charge for

exhausting air.

0g

H˖

1180 r/min

Refrigerant

Charge if over Standrad

Pipe Lenth

50g/m

M˖

1050 r/min

Lenth×Internal/External

Diametre

2.7*1.4

Indoor

Velocity

L˖

920 r/min

Capilary

Refer No.˖　　　

H˖ 840 r/min Indoor˖　　　　　　　　　1.30 mm
H˖ ---- r/min

Height of rising

radiator slice

Outdoor˖ 1.37 mm

H˖ ---- r/minNet˖

8.8kg

Outdoor

Velocity

Indoor Weight

Gross˖

10.6kg

Net˖

57kg

Indoor˖ 500(12) m3/h

Outdoor Weight

Gross˖

66kg

Air

Vol ume

(High)

Outdoor˖ ----- m

3

/hIndoor Dimension(L×W×H)˖ 795×265×182 mm

Capacitor of Fan Motor˖

……

Indoor Packaging Dimension(L×W×H) 865x272x330 mm

Class of electric Shock Protection

ĉ

Outdoor Dimension (L×W×H)˖

810×288×680 mm

Class of Water Proof˖ IP 24 Outdoor Packaging dimension(L×W×H) 960×405×760 mm

Moisture Removal˖

2.4×10

-3m3

/h

liquid /Gas pipe Diametre

ij6.35/9.52 mm

Model

: YR-

H10 standard Lenth

5m

Remote

Controller Refer. No.˖

0010401628

Refrigerant

Pipe

Max Lenth 15 m

Remote Controller Bracket˖ ----- Lenth/Diametre of Drain Hose ----

Appearance˖ ----- Max. pressure at warm side˖ 4.15 MPa

Climate Type˖ T1 Max.pressure at cool side˖ 4.15MPa

Installation Bracket Type˖ ----- Plug Type(spec.)˖ ---

Area available for clooling/heating

15-23 m

2

Ammeter spec.˖ ---

Dry/Wet ball(indoor)˖ 32℃/ 223 ćDry/Wet ball(indoor)：２７　　/ć --ć

Max.running

temperature(cooling):

Dry/Wet ball(outdoor)˖ 43 / 26 ćć

temperature(heating):

Dry/Wet ball(outdoor):２４℃／１８℃

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Air Conditioner        Edition:2005/11/18

ELECTRICAL CONTROL

One. Temperature Control Function

In temperature control function, the operation frequency of outdoor unit is determined based on room
temperature and the set temperature.
In automatic fan speed mode, indoor fan is controlled based on the need of temperature control
In heating mode, indoor fan is controlled based on the temperature of coil.
1-1-1.Specification of Indoor Ambient Temperature Sensor
In case of short circuit or open circuit, indicator lamp alarms and indoor fan stops. When normal condition is resumed,
fan will automatically restart and operate normally.
Short Circuit:
Temperature: over 126

o

C, Hexadecimal System: over F8H, Resistance: below 0.65K,Voltage: over 4.85V.
Normal Temperature:
Temperature: 25

o

C, Hexadecimal System: 40H, Resistance: 23K, Voltage: 2.33V.
Open Circuit:
Temperature: below -31

o

C, Hexadecimal System: below 08H, Resistance: below 620K Voltage: below

0.15V.
B Parameter = 4200 R (25

o

C) = 23K

1-1-2 Specification of Indoor Coil Temperature Sensor
B Constant Number = 3700 R (25

o

C) = 10KΩ

1-1-3 When heating operation starts and indoor fan stops or when within 30s of indoor fan starts after
heating operation starts, the resistant of indoor ambient temperature sensor is ignored. (to avoid the
impact of heat exchanger temperature over it.)
When forced operation ends after start-up, temperature zone control begins.
1-2. Set Temperature Correction
Set temperature is corrected according to unit model, operation mode, fan speed and whether it is in
power operation.
Fan speed correction is available only during low and mid heating operation.

1-3. Temperature Zone Control
1-3-1.Error

Temperature zone error is calculated as per the following formula

:

In Heating Mode: E = (Remote Control Set Temperature + Correction Value) – Indoor Temperature
In Cooling & Dehumidification Mode: E = Indoor Temperature - (Remote Control Set Temperature +

Correction Value)

1-3-2 Compressor Shutdown
E is negative and |E|>∆T

Heating Cooling

∆T TCHAHL 0.67 TCHACL 0.33

After change of ∆T TCHAHH 0.67 TCHACH 1
∆T Change Condition When operation starts E ≥ 3.0℃,

Compressor shuts down after continuous testing for 120s,
At the beginning of operation, with reference to the conditions given in above table, it operates based
on the parameters after change of ∆T until compressor shuts down for the first time. In the time period
between compressor shutdown and restart, it operates based on ∆T. (except in dehumidification mode)
Compressor starts at the beginning of operation or upon switch of operation mode (except standby ends)
or when E (error) > -∆T.
When compressor is operating, remote control set temperature is changing towards the direction of
compressor shutdown and when it is below –∆T, compressor will shut down.
1-3-3. Compressor Operation
Compressor restarts when E (error) > -△T+0.67℃ and when 3 mins standby is over.

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T

wo. Indoor Fan Control

2-1. Heating
2-1-1. Warm Start

Cold Air Control in Heating Mode

Heat Exchange Temperature:

THHOT3

37.0℃

THHOT2

35.2℃

THHOT1

25.2℃ 4mins

THHOTR
16℃

Stop SLO LO Set LO SLO Stop

Conduct indoor fan control as per the above diagram and the heat exchange temperature.

1. Judge wind speed when heat exchange temperature is rising:

Fan is at super low level when heat exchange temperature is below 35.2℃.（Fan will stop upon
initially energized into heating mode or after defrosting, or when heat exchange temperature is lower
than 25.2℃. Fan is at super low level when temperature is higher than 25.2℃ but lower than

35.2℃.）;

Fan is at low level when heat exchange temperature is between 35.2℃ and 37℃;
Fan will operate as per setting when heat exchange temperature is above 37℃.

2. Judge wind speed when heat exchange temperature is falling:

Fan is at low level when heat exchange temperature is below 35.2℃ but above 25.2℃;

Fan is at super low level and will maintain the mode when heat exchange temperature is lower than

25.2℃（Fan is at super low level upon initially energized into heating mode or after defrosting, or
heat exchange temperature is lower than 25.2℃ but higher than 16℃; Fan will stop when heat
exchange temperature falls below 16℃.）

3. Wind speed is at super low or low level when heat exchange temperature is rising. If heat exchange

temperature fails to enter the next temperature zone after 4 mins while wind speed rises to the next
stage, it is necessary to maintain the set wind speed for 4 mins before it is adjusted based on heat
exchange temperature.

4. When heat exchange temperature is falling, wind speed will return to set speed if low wind level is

maintained for over 4 mins.

2-1-2. 3 mins standby period when compressor shutdown.

1. When compressor shuts down（temperature sensor is off）, airflow is low for the initial 20s then
reduced to super low (When in silent operation, it is SSLO);

2. Wind is maintained at super low level in the standby period in heating mode（Compressor stops during
mode switch.）.

3. Remote control shut down and stop indoor fan.
2-1-3. Compressor Restart
When warm start, airflow is at remote control set level.
When in automatic airflow mode, airflow is determined based on temperature.
Refers to temperature zone control functions.
2-2 Cooling
Airflow is different when airflow is set at high, mid and low level.
When in automatic airflow mode, airflow is determined as per temperature. Refers to temperature control
functions. (Refers to 2-4-8）
2-3. Dehumidification

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2-3-1. Compressor is off and is in 3 mins standby.
Fan will stop if compressor stops
Fan is at super low level upon the end of 3 mins standby.
Compressor is on after 3 mins standby.
2-3-2. Compressor is on.
When airflow is set at high, mid or low level, fan will operate as per the setting.
When in automatic airflow mode, airflow is determined as per temperature.

Three. Air Refreshing

Up reception of remote control signal, negative ion generator will start operation to emit negative ion if
fan is operating.
If fan stops, negative ion generator is off.
When negative ion generator is off, if air-refreshing feature is set and fan restarts then negative ion
generator is on.

Four. Timed Operation

Time counting will start based on the difference of timer clock and current clock.
In timed operation, display panel timer lamp is on.
4-1. Timer Off
When timer off is set, panel timer lamp is on and unit will stop operation as per the timing.
4-2. Timer On
If timer on is set, when unit is off, panel timer lamp will be on and unit will resume operation as per the
timing and in set mode.
Execution sequence is based on the setting.

Five. Sleep Operation

When remote control set sleep mode, timer lamp is on.
５－1. In cooling/dehumidification mode, set temperature will rise 1

o

C after 1 hour operation and another

1

o

C after the second hour. The unit will stop after another 6 hours.

5－2. In heating mode, set temperature will fall 2

o

C after 1 hour and another 2 oC after the second hour

and will rise 1

o

C after another 3 hours and the unit will stop after another 3 hours.

5－3 If airflow of indoor fan is high before setting sleep mode, then it will turn into mid level after sleep
mode is set. If airflow of indoor fan is mid before setting, it will turn into low level after setting. If airflow of
indoor fan is low before setting, then it will not change after setting.

Six. Automatic Operation

Automatic operation consists of two features of automatic and full automatic, which can be realized
through EEPROM selection.
6-1. Automatic Operation Mode:

On entering this mode, main control unit will decide the corresponding operation mode as per room

temperature to maintain the set temperature（Set temperature is 23℃in heating mode and 26℃ in
cooling mode.）.

Upon initial startup, the unit will enter heating mode if room inlet air temperature is equal to or lower

than 23℃ or it will enter cooling mode if temperature is higher than 23℃.

When entering heating mode, the unit will operate as per heating program（set temperature is 23℃）

Upon reaching temperature where compressor stops operation, compressor will stop and standby for 3
mins. In case it detects that inlet air temperature is higher than 27 15 mins after compressor stops, the ℃
unit will enter cooling mode. Otherwise, the unit will remain in heating mode.

When entering cooling mode, the unit will operate as per cooling program（set temperature is 26℃）.

Temperature difference compensation is automatically cancelled. Upon reaching temperature where
compressor stops operation, compressor will stop and standby for 3 mins. In case it detects that inlet air
temperature is equal to or lower than 23℃ 15 mins after compressor stops, the unit will enter heating
mode. Otherwise, the unit will remain in cooling mode.

If the unit changes into automatic mode from any other mode and if the operation mode is changed

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(detect before operation), the unit will stop for 3 mins and it will operate based on inlet air temperature
after 3 mins.

Seven. Trial Operation
Trial operation will end after 30 mins, after which unit shuts down. In trial operation, the unit will quit trial
operation mode upon reception of signal.
Low load protection will not start.

Constant Frequency Multi-split Unit（ Single, Double Compressors ） Low Load Protection
（Anti-freeze）Function:

Anti-freeze protection feature is available (Invalid in trial operation and heating mode):
Avoid freeze of indoor heat exchanger（in cooling and dehumidification mode）Compressor will stop
when temperature of indoor coil ≤ 0℃ and when compressor operates for over 5 mins. Compressor will
restart when temperature of indoor coil rises to over 7℃ (It must meet the needs of 3-min delay.).

In case high load protection is actuated twice within 30 mins, high load protection will alarm.
In case heat exchange temperature does not reach "THHEAT[2]", normal temperature zone control will
resume. .
Adopt the lower of either high load frequency or zone frequency as operation data.

Constant Frequency Multi-split Unit（single, double compressor）High Load Protection Control:

1. Fan Stop Protection: Indoor unit only sends A/D value to outdoor unit and outdoor unit exerts control;

2. Compressor Stop Protection:

Eight. Heating Low Temperature Treatment

In case it is unable to switch the four-way valve or in case the temperature of heat exchanger is below
"THHOTLTH"（-4.5℃）for "TMHOTLTH"（90s）, compressor will stop and standby for 3 mins. Compressor
will restart when heat exchange temperature is above "THHOTLTH"（-4.5℃）.

Fourteen. Communication

8-1 Communication between Indoor & Outdoor Unit
Note: This communication mode is compatible with three unit models of constant frequency
double-compressor multi-split, constant frequency single-compressor multi-split and inverter-controlled
multi-split.
8-1-1 Communication Sequence
Communication starts 2s after power is supplied. Indoor unit will send out signal first and transmission
will maintain at LO of 5ms then it starts to receive signal. In case, signal cannot be received within 2s,
another signal will be sent out. Upon reception of signal, another signal will be sent out after 10ms.
While indoor unit is waiting for signal input, its signal transmission is HI.
Error transmission occurs when indoor unit is unable to receive signal for 10 attempts (20s) after the
previous signal reception. In case of time reduction and shutdown, it is not considered as error
transmission.
Communication treatment will be engaged upon reception of correct HAD signal.
At the end of signal reception, communication data and reverse data will be compared and all the data
will be discarded in case of any error.
Outdoor unit will wait for signal from indoor HEADER HDR (81H) when power is supplied.
When sending signal, signal with header of C3H will be sent first.
During signal transmission, data"1" will output HI of 9MS and LO of 2MS, while data "0" outputs HI of
2MS and LO of 9MS.
Received signal is treated based on the majority of 5, 6 and 7MS.
Signal is only treated when correct HRD signal is received.

Nine. EEPROM Control

When outdoor unit is supplied with power, if there is any inconsistency between EEPROM parameter and

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checksum, EEPROM error.

When indoor unit receives EEPROM error signal from outdoor unit, it will display outdoor unit EEPROM error.

At this time, control and emergency operation are not acceptable.

It can only be cancelled through power off.

Ten. Error Record

There is no display when no error code record exists.

Error display mode automatically ends in 10s.

Only stop signal is accepted by remote control. Error record display mode ends corresponding to switch or

remote control stop signal.

For unit with EEPROM, record is saved when power is reset.

Eleven. Error Detect Method

1

1-1. Indoor Temperature Sensor Error

In operation, an error occurs if the temperature is above 126

o

C or below – 31oC.

Operation will resume automatically when temperature is outside the above range.

1

1-2. Heat Exchange Temperature Sensor Error

In operation, an error occurs if the temperature is above 196

o

C or below – 53oC.

Operation will resume automatically when temperature is outside the above range.

In error condition, low load protection is cancelled.
11-3. High Load

After high load and high limit is actuated, if the same operation recurs within 30 mins, a high load and high limit

error occurs.
11-4. Outdoor Temperature Sensor Error

On receiving error code of defrosting, air discharge temperature, base pane or outdoor temperature sensor,

indoor unit will display outdoor temperature sensor error.

Operation will resume automatically when receiving signal of removal of outdoor temperature sensor error.

In the error period, low load protection is cancelled.

1

1-5. Outdoor Unit Protection & Control Function

Indoor unit will display error when receives the following error codes:

Compressor Discharge Duct High Temperature Protection, DC Over Current, CT Disconnection, AC Over

Current, Power Module High Temperature Protection, Power Module Over Current Protection, Low Voltage

Protection, Outdoor Unit EEPROM Error, Compressor Operation Error.

Error conditions will be cancelled by stopping operation when outdoor unit receives 17654=0001,13=0 error

removal signal.
11-6. Transmission Error

Based on the condition of communication between indoor and outdoor unit, in case outdoor unit fails to

receive signal within 20s after indoor unit sends out signal, transmission is abnormal. (except in the period of

first 2 mins when power is supplied.). It is confirmed as transmission error when outdoor unit receive the error

signal.

Transmission error is removed by stopping operation.

Twelve. Special Function

1

2-1. Independent Operation of Indoor Unit

a. Entry Condition: First set remote control as heating high wind, 30

o

C, initial energization, press sleep key 6

times in 7s and there will be 6 sounds.

b. On entering independent operation of indoor unit, indoor unit will operate as per the following procedures:

Indoor unit will operate and communicate as per setting. Communication signal form outdoor unit will not be

treated by indoor unit while it will send signals to outdoor unit continuously.

c. Exit Condition: On receiving remote control or emergency shut down signal, it will exit independent

operation of indoor unit. Furthermore, it will exit independent operation of indoor unit after power off and power

on again. During independent operation of indoor unit, it may simulate outdoor unit and send the following

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signals to indoor unit:

1

2-2. Power-Off Compensation

a Entry Condition: Press sleep key 10 times in 7s and buzzer gives out 4 sounds and save the current status

into indoor unit EEPROM upon the entry.

b. On entering power-off compensation operation, indoor unit operates as per the following procedures:

Remote control emergency signal, and operates as per condition set by remote control and emergency setting

and save the current status into indoor unit EEPROM.

Main unit will operate as per condition set on panel board. And save the current status into indoor unit

EEPROM.

c. Exit Condition: Press sleep key 10 times in 7s and buzzer gives out 2 sounds

d. If timer and sleep features are set under power-off compensation condition, main unit memory is in a state

of shut-off if power is off and on again.

T

hirteen. Emergency Switch

When shutdown, press emergency switch down for less than 5s, the unit will start emergency operation.
When shutdown, press emergency switch down for more than 5s but less than 10s, the unit will start trial
operation.
When shutdown, press emergency switch down for more than 10s but less than 15s, it will demonstrate
the previous error.
When shutdown, press emergency switch down, the panel will display automatic operation.
When shutdown, press emergency switch down for less than 15s, or remove hand from emergency
switch, the unit will not accept remote control signal.
Unit enters shutdown condition after 15s.
Unit can receive remote control signal after 15s.
Press emergency switch during operation, air-conditioner will shut down.,
During operation, if error occurs, press emergency switch to shut down the unit to clear error condition.
During error presentation, press emergency switch and error presentation will end.
During operation, if emergency switch is pressed continuously (press and hold) in normal or abnormal
condition (such as tact switch short circuit) or in error presentation condition, the unit can also receive
remote control signal.
Error Record Presentation Mode:
When press and hold switch for 10s it gives out 3 sounds, release switch to enter error record
presentation mode. Press and hold switch for 15s, panel display is off and error record presentation
mode is cancelled.
Previous alarm information will be sent to display panel for status display.
Error record presentation mode is cleared after 10s. (Error record presentation mode is only displayed
for 10s.)
During the presentation, no remote control signal except shutdown signal is accepted.
There is no presentation when no error occurs, only buzzer utters sound.

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1. Definition of chip tubes’ pins
Chips are used in this manual and their pins are defined as follows:

Chip’s Pins Definition of Function Chip’s

Pins

Definition of Function

GND GND P37AIN5 CTA signal input
XIN XIN P36AIN4 CTB signal input
XOUT XOUT P35AIN3 tube temperature A
TEST GND P34AIN2 tube temperature B
VDD +5V P33 AIN1 Outdoor ambient temperature
P21 Alarm light

(to be connected with pull resistance)
reuse for self-checking/contracting

P32 AIN0

P22 Serial communication output

(to be connected with pull resistance)

P31

P32 P31 Model selection
0 0 Model 1
0 1 Model 2
1 0 Model 3

1 1 Model 4
RESET Reset P30 EEPROM--SCL
P20 4-way valve A P12 EEPROM--SDA
P00 4-way valve B P11 -INT1 Communication input A
P01 High air flowrate P10 -INTO Communication input B
P02 Mid air flowrate P07 Communication output A
P03 Low air flowrate P06 Communication output B
P04 Compressor B P05 Compressor A

2. Communication format

Note: This communication format is compatible with 3 models, i.e., double-compressor one-drive-two
without converter, single-compressor one-drive-two without converter and one-drive-two with
converter.

2.1. Sequence of communication
Communication begins 2 seconds after the power supply inputs. The indoor unit first gives out a

signal and outputs the LO which remains at 5 ms, then changes to receive signal. If it fails to
receive signal 2 seconds after the signal is given out, it will give out a signal once again. After the
signal is received, it will give out a signal once more 10 ms later. When the indoor unit is waiting
for the signal input, the signal output is HI. If the indoor unit fails to receive signals in normal
condition in times (20 seconds) after the previous signal has been received, the transmission is
abnormal. But time shortage and being halted are not of abnormal transmission. Communication is
carried out when a correct HDA signal is received. After the signal has been received, the
communication data is compared with the inverter data. When incorrect, all the data will be given
up. The outdoor unit waits to receive signal HEADER HDR(81H) from the indoor unit after the
power supply inputs. After the signal has been received, the communication data is compared with
the inverter data. When incorrect, all the data will be given up.

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The outdoor unit waits to receive signal HEADER HDR(81H) from the indoor unit after the power
supply inputs. When transmitting signal, HEADER is C3H. When a signal is first transmitted at the
head, data "1" outputs HI of 9MS and LO of 2MS and data "0" outputs HI of 2MS and LO of 9MS.
When receiving signal, the signal reception is carried out depending on the majority of the 5th, 6th
and 7th 5,6,7MS.

The signal reception will not take place until a correct HDR signal is received.

Output 1:

0:

Input 1:

0:

9ms 2ms

2.2. Checkout of errors
The signal reception does not take place until the outdoor unit receive signal HDR from the indoor

unit. At the completion of the signal reception, the data is compared with the inverter data. When
incorrect, all the data is given up. If it is incorrect in 20 seconds of comparison, the compressor,
4-way valve and outdoor fan turn off, giving the abnormal condition and sending out the
corresponding error codes for the abnormalcy of signal delivery and transmission.

2.3. Timer for communication data input /output
After the power supply inputs, the outdoor communication output is HI, waiting for the indoor unit

to send signal.

The timer counter is cleared 0 at the decline of communication, regarding 3 times of 5,6,7 ms.
The status of the communication input PORT determines input signals. When in the next decline of

communication, the timer counter is cleared one again.

HEADER 8 bits, the data and inverter data 48 bits, and the total is 56 bits. After the data has been
received, LO of 10 ms is ready to send signal. The 0 clearance of the timer counter during the
sending takes place in a 1 ms interruption.

HEADER 8 bits, the data and inverter data 48 bits, and the total is 56 bits. After the data has been
sent, Both output LO of 5 ms and output HI of 5ms are ready to receive signal 4 and
communications

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A7-6 A5-3 A2-0 C7-0 E7 E6 E5 E4 E3 E2-0
Protocol
MSB

8 2 3 3 8 1 1 1 1 1 3 LSB

READER Oper

ation
mode

Not
in
use

Section Heat

excha
nge
temp.

Not
in
use

Trouble
record

Set
oper
ation

Capa
city

Time
short
age

Abnor
mal
informa

tion
HDR A B C D E F
10000001 00000000 11111111 00000000 11111111 00000000 11111111

HDR: READER indoor unit→outdoor unit 81H 10000001

Communic

ation

Letter

Communication Byte Communication Content Remark

A7, A6

00 stop 01 cooling
10 dehumidify 11 heating

Operation mode

A5

0: normal 1: trial
operation

A4

0: normal
1: timer on operation in

heating

A3

0 ordinary
1 timer on operation in
cooling

A

A2A1A0

000:0
001:1
~
110:6
111:7

Variable
frequency: [set
temp.- room
temp.] section
Fixed frequency:
000: Off
Other: On

C

C7-0

00000000: - infinite
00000001: -53℃
~
10000000: 54℃
11111111:368℃

Indoor unit heat
exchange
temperature

E7 Not in use

E6

0: normal
1: trouble record
indication

E5

0: normal
1: set operation

E

E4 Not in use

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E3

0: normal
1: time shortage
operation

E2 E1

00 double-compressor
one-drive-two without
inverter
01 single-compressor

one-drive-two without

inverter
10 One-drive-two with
inverter

E0 Not in use Can not be used

B,D,F: inverter data of A,C and E respectively 8 Bits each

G7-0 I7-4 I3 I21 I0 K76 K54 K3-0

Protocol
MSB

8 8 4 1 2 2 2 4 LBS

HEADER Output

Frequency

Error
code

Err
or
ide
ndi
ty

3 minute
standby

Operation
mode

Oper
ation
sign
al

Moni
tor
signa
l

HDR G H I J K L
11000011 00000000 11111111 00000000 11111111 00000000 11111111

HDA: HEAD 8BIT outdoor unit→indoor unit C3H 11000011

Communi

cation
Letter

Communicat

ion Byte

Communication Content Remark

G G7-G0 00000000:OHZ

│

11111111:255HZ

Variable frequency: output
frequency

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I I7-I4 0000: compressor operation abnormal

0001: normal
0010: discharge pipe temperature over-rise
protection
0011: DC wave crest current
0100: outdoor EEPROM abnormal
0101: AC wave crest current(AC current too
high)
0110: not in use
0111: communication abnormal
1000: CT disconnected
1001: undervoltage protection

1010: outdoor thermistor abnormal
1011: not in use
1100: outdoor base plate temperature
over-rise protection
1101: outdoor ambient temperature sensor in
trouble
1110: outdoor coil sensor
1111: not in use

Black indicates the trouble in the
unit with inverter
Red indicates the trouble in the
unit without inverter
Note:

1. Outdoor AC current too high,
i.e., original transformer
troubles A and B.

2. The troubles A and B in the

coil and transformer of previous
outdoor units are separate. Now
the troubles in the outdoor coil
and transformer are no longer
differentiated by A and B.

I3 0: normal

1: error identity

In case of 1, it indicates error.

I2,I1 00: data abnormal

01: normal
10: defrosting operation
11: not in use

In case of 10, the air blower
control operation during
defrosting takes place.

I0 0: normal

1: 3 minute standby

K7,K6 00: stop 01: cooling

10: dehumidifying 11: heating

K5, 0: not double-compressor heating 1:

double-compressor heating

K4 0: normal 1: rated operation
K3 0: normal 1: abnormal operation

K

K2-0 000: normal

1**: RC heating at the non-communication
side starts in the timer
*1*: RC cooling at the non-communication
side starts in the timer
**1: both units are in operation

H, J, L: inverter data of G, I and K respectively 8 bits each

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3. Single-unit cooling operation

3.1. When the single unit’s indoor unit gives a cooling signal, the corresponding outdoor
compressor carries out cooling operation. During the operation, the outdoor fan operates 1
second before the compressor operates.

3.2. When changed from heating to cooling, the compressor stands by for 3 minutes, the outdoor
fan operates to blow off remaining heat and stops 30 seconds later.

3.3. When the outdoor ambient temperature T1≥38℃, the outdoor fan runs at the high speed.
There is a return difference of 2℃ for the change between high and medium speed.
When the outdoor ambient temperature T1≤26℃, the outdoor fan runs at the low speed. There

is a return difference of 2℃ for the change between low and medium speed.

When the outdoor ambient temperature T1≤8℃, the outdoor fan is in a cycle of 1 minute stop

and 3 minute run. There is a return difference of 2℃ for the change between low speed and run
and stop.

3.4. Once the fan operates in a mode, it must operate for more than 45 seconds.

There is a temperature cut-off protection: when the indoor coil temperature higher than T_CPS (68
℃) and maintains for 10 seconds, both the compressor and outdoor fan stop. The compressor will
not restart in 3 minutes until the coil temperature lower than T_CP R(50℃). The indoor fan is
controlled the same as the thermostat is OFF.

4. Double-unit cooling operation

4.1. When the indoor unit gives out a double unit cooling signal, outdoor compressor A starts
cooling operation. During the operation, the outdoor fan runs 1 second before compressor A
operates, 20 seconds later, outdoor compressor B starts cooling operation.

4.2. Once a compressor starts, the other compressor will not start in 20 seconds from the start.

4.3. When changed from heating to cooling, the compressor stands by for 3 minutes. When both
compressors are in the strand-by status, the outdoor fan stops. Otherwise, it operates. The status
of the fan depends on the number of the compressors that operate.

4.4. When the outdoor ambient temperature T1≥30℃, the outdoor fan runs at the high speed.
There is a return difference for the change between high and medium speed;

When the outdoor ambient temperature T1≤23℃, the outdoor fan runs at the low speed. There
is a return difference for the change between low and medium speed;

When the outdoor ambient temperature T1≤5℃, the outdoor fan is in a cycle of 1 minute stop

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and 3 minute run. There is a return difference of 2℃ for the change between low speed and run
and stop.

4.5. Once the fan operates in a mode, it must operate for more than 45 seconds.

4.6. There is a temperature cut-off protection: when a indoor coil temperature higher than T_CPS
(68℃) and maintains for 10 seconds, the corresponding compressor stops. The compressor will
not restart in 3 minutes until the coil temperature lower than T_CP R(50℃). The indoor fan is
controlled the same as the thermostat is OFF.

4.7. In the case of double-unit cooling, one compressor stops and it changes to the single-unit
operation. The fan is controlled in the single-unit operation mode. It stops 30 after blowing off
the remaining heat only if both compressors turn off at the same time.

5. Single unit heating operation:

5.1. When the single unit’s indoor unit gives a heating signal, the corresponding outdoor

compressor carries out cooling operation. During the operation, the outdoor fan and 4-way valve
operate 1 second before the outdoor fan operates.

5.2. When changed from cooling to heating, the compressor stands by for 3 minutes, the outdoor

fan stops.

5.3. When the outdoor ambient temperature T1≤3℃, the outdoor fan runs at the high speed. There

is a return difference of 2℃ for the change between high and medium speed.
When the outdoor ambient temperature T1≥13℃, the outdoor fan runs at the low speed. There is a
return difference of 2℃ for the change between low and medium speed.

5.4. Once the fan operates in a mode, it must operate for more than 45 seconds.

5.5. There is a high temperature protection and a temperature cut-off protection.

High temperature protection: When the indoor coil temperature higher than T_OFS (56℃), the
outdoor fan stops; when the coil temperature falls to T_OFR (52℃), the outdoor fan restarts. The

outdoor fan stops for more than 45 seconds.
High temperature cut-off protection: When the indoor coil temperature higher than T_CPS (68℃)
and maintains for 10 seconds, both the compressor and outdoor fan stop, and the indoor fan operates
as the thermostat is Off. The compressor will not restart in 3 minutes until the coil temperature
lower than T_CP R(50℃).

6. Double-unit heating operation

6.1. When the double-unit’s indoor unit gives out a heating signal, outdoor compressor A starts

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heating operation. During the operation, outdoor compressor A and the 4-way valve operate 1
second before the fan starts, 20 seconds later, outdoor compressor B starts heating operation.

6.2. Once an outdoor compressor starts, the other compressor will not start in 20 seconds from the
start.

6.3. When changed from cooling to heating, the compressor stands by for 3 minutes. When both
compressors are in the strand-by status, the outdoor fan stops. Otherwise, it operates. The status
of the fan depends on the number of the compressors that operate.

6.4. When the outdoor ambient temperature T1≤10℃, the outdoor fan runs at the high speed.
There is a return difference for the change between high and medium speed;

When the outdoor ambient temperature T1≥20℃, the outdoor fan runs at the low speed. There
is a return difference for the change between low and medium speed.

6.5. Once a fan operates in a mode, it must operate for more than 45 seconds.

7. Cooling and heating operations take place at the same time:

7.1. When one of the indoor units gives out a cooling signal and another unit gives out a heating
signal at the same time, the outdoor fan operates at the low speed.

7.2. When the indoor unit gives the value of coil temperature, the outdoor fan runs at the low speed if
the heating outdoor unit judges high load.

7.3. When outdoor ambient temperature T1≥28℃, there is no heating operation.

7.4. When outdoor ambient temperature T1≤7℃, there is no cooling operation.

7.5. Once a compressor starts, the other compressor will not start in 20 seconds from the start.

8. Single-unit heating operation with heat load:

8.1. In the single-unit heating operation, the indoor unit gives out the value of the coil temperature,
and the outdoor unit judges whether to start in the high load protection operation based on the
value of the coil temperature it has received. If the conditions for high load protection are met, the
outdoor fan stops immediately. It will restart 45 seconds later if the signal for the outdoor heat load
disappears. Otherwise, the outdoor fan will continue to stop until the signal for the outdoor heat
load disappears. The signal for heat load is as follows:

High temperature protection: When the indoor coil temperature higher than T_OFS (56℃), the
outdoor fan stops; when the coil temperature falls to T_OFR (52℃), the outdoor fan restarts. The
outdoor fan stops for more than 45 seconds.

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High temperature cut-off protection: When the coil temperature higher than T_CPS (68℃) and
maintains for 10 seconds, both the compressor and outdoor fan stop, and the indoor fan operates as the
thermostat is Off. The compressor will not restart in 3 minutes until the coil temperature lower than
T_CP R(50℃).

8.2. In the single-unit heating operation, the current in the compressor is larger than 5.8A, and the
outdoor fan stops. 45 seconds later, the current in the compressor is less than 5.3A, and the outdoor fan
operates in normal condition(the compressor does not detect current within 30 seconds after its start),
the current in the compressor is larger than 5.3Aand less than 5.8A, and the outdoor fan does not
restore.

9. Double-unit heating operation with heat load

9.1. In the double-unit heating operation, the indoor unit gives out the value of the coil temperature,
and the outdoor unit judges whether to start in the high load protection operation based on the
value of the temperature it has received. If the conditions for high load protection are met, the
outdoor fan stops immediately. It will restart 45 seconds later if the signal for the outdoor heat load
disappears. Otherwise, the outdoor fan will continue to stop until the signal for the outdoor heat
load disappears. The signal for heat load is as follows:
High temperature protection: When the indoor coil temperature higher than T_OFS (56℃), the
outdoor fan stops; when the coil temperature falls to T_OFR (52℃), the outdoor fan restarts. The
outdoor fan stops for more than 45 seconds.
High temperature cut-off protection: When the coil temperature higher than T_CPS (68℃) and
maintains for 10 seconds, both the compressor and outdoor fan stop, and the indoor fan operates as
the thermostat is Off. The compressor will not restart in 3 minutes until the coil temperature lower
than T_CP R(50℃).

9.2. When the outdoor single-unit gives out the heat load signal, the outdoor fan stops immediately,
45 minutes later, the heat load signal disappears, and the outdoor fan operates.

9.3. In heating operation, any of the current in the compressor is larger than or equal to 5.8A , and
the outdoor fan stops. The current in the compressor is less than or equal to 5.3A, and the outdoor
fan restores (the compressor does not detect current within 30 seconds after its start), the current in
the compressor is larger than 5.3A and less than 5.8A, and the outdoor fan does not restore.

10. Current peak protection

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10.1. The current in the compressor is larger than 10 Afor more than 5 seconds, The compressor which
has the highest current will stop(the compressor does not detect current within 10 seconds after its
start) and 3 minutes later it will continue to operate.

10.2. The compressor will no longer operate if overcurrent protection occurs 4 times in a row within
30 minutes, and the output transformer signal fails. In the double-unit operation, if one of the
compressors stops due to the current too high, the other system is a single system.

11. Single-unit defrosting operation (outdoor judgement)

Defrosting control

11.1. Conditions for starting in the defrosting operation

The heating compressor starts and operate continuously for 10 minutes. After the compressor has
been operating for 45 minutes in total (the defrosting operation ends, or when starting in the
cooling mode, the compressor totals the operating time for zero clearance), detecting the
defrosting sensor TE (detecting the frosting of the outdoor heat exchanger) and the outdoor
ambient temperature sensor TA for straight 2 minutes, provided the following conditions are met,
it will start for the defrosting operation: TE≤C×TA－α

Where,

C: T A ＜0℃

C=0.8

TA≥0℃

C=0.6

αcan be selected according to the data of EEPROM as follows:

Selection of

Jumper

L M H

α(℃) 10 8 6

In the place where it tends to frost, it is preferred to choose H. In the place where it does not intend to
frost, it is preferred to choose L. It is set M at delivery.
During the defrosting operation, the temperature control starts -15℃≤C×TA－α≤-2℃

Note: If the result of the calculation from C×TA－α is less than -15℃, -15℃ applies. If the result

of the calculation from C×TA－α is larger than -2℃, -2℃ applies.

11.2. Interval of defrosting

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When the result of the calculation from C×TA－α falls in the range of -15℃≤C×TA－α, the
interval between two defrosting operations is 45 minutes.
When the result of the calculation from C×TA－α falls in the range of C×TA－α<-15℃, the
interval between two defrosting operations is 55 minutes.

11.3. Defrosting operation
At the beginning of defrosting, the compressor is halted for the first one minute, but the outdoor fan
operates, 50 seconds later, the 4-way valve is OFF.
During the defrosting operation, such protections as the compressor’s current protection are available.
The compressor may be interrupted for its protection or due to a trouble, and restore after 3 minutes. If
it remains in the defrosting period, it will still start to defrost. The start of the compressor is made by
the rules for the start of the defrosting compressor. (if it cannot restore 3 times in a row, it will be dealt
with as in trouble and cancel defrosting.)

11.4. Once starting to defrost, the compressor must be guaranteed at least 2 minutes of operation
before canceling defrosting. As for the conditions to cancel defrosting, it will restore to the heating
operation from the defrosting operation as long as any of the following conditions is met.
(1) . The outdoor heat exchanger temperature is above 7 degrees for consecutive 80 seconds.
(2) . The outdoor heat exchanger temperature is above 5 degrees for consecutive 12 seconds.
(3) . The defrosting operation has lasted 9 minutes.

11.5. After the conditions for cancellation of defrosting are met, the following operations will follow:
The compressor stops, the outdoor fan starts, 50 seconds later, the 4-way valve is engaged, and 60
seconds later, the compressor operates.

12. Double-unit defrosting operation (outdoor judgement)

After receiving the signal to stop the indoor unit during the defrosting period, the unit must not be
turned off until the outdoor defrosting lasts more than 2 minutes.
When the double units are activated for defrosting, the activation of compressor B is 20 minutes later
than that of compressor A.
Conditions for ending defrosting: It will restore to the heating operation from the defrosting operation
as long as any of the following conditions is met.
(1) . The temperatures on both outdoor heat exchangers are above 7 degrees for consecutive 80

seconds.

(2) . The temperatures on both outdoor heat exchangers are above 5 degrees for consecutive 12

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seconds.
(3) . The defrosting operation has lasted 9 minutes.
The starting conditions and control process for the double-unit are same as that for single-unit
defrosting, the only difference is that the activation of compressor B lags that of compressor A.

13. Alarming operation

1. When the whole unit is in normal operation, the alarm light is always on, but does not flash.

2. When the outdoor temperature sensor short-circuited or disconnected, the outdoor fan always

operates at the medium speed and will restore automatically after the sensor comes to normal.

3. When the temperature sensors on the pipes A and B short-circuited or disconnected, the double

unit will not carry out defrosting operation. During heating, this signal is sent to the indoor unit,
but no sending for other operating conditions. When sent to the indoor unit, the whole unit stops.
The signal is sent to the indoor unit which coil is operating abnormally, and the corresponding
indoor unit indicates trouble.

4. When the temperature sensor short-circuited or disconnected or the current transformer fails, the

alarm light flashes in the following manner; when the current transformer fails, the signal is sent
to the indoor unit that operates abnormally, and the corresponding indoor unit indicates trouble:

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H2SM-14/18C03/R2

22

Codes and Description

Code indication

indoor

Description

Outdoor led1

blinks times

Power timer operate
Operate heating cooling

★ ■ ■

Room temperature sensor failure --

★ □ □

Heat-exchange sensor failure --

★ □ ★

Indoor EEPROM error ---

■ □ ★

Indoor fan motor malfunction --

Indoor

Malfunction

■ ■ ★ Communication Error (between indoor and outdoor unit)

3 or 7

outdoor EEPROM error 1

★ □ ■ Outdoor Senistor Error

2

outdoor unit A’s coil sensor failure

5

Outdoor

Malfunction

outdoor unit B’s coil sensor failure

9

explanation □on★flash■off

Trouble Shooting

★ ■ ■: Room temperature sensor failure CN8
★ □ □: Heat-exchange sensor failure CN8

YES

NO

YES

whether terminal CN8 on

indoor PCB contact wellt?

Pull out the terminals on the indoor mainboard and

reinsert them

Pull the sensor out of the mainboard

1) Measure the value of resistance Between its two

jumpers

2) Measure the temperature at the room temperature

sensing head.

Check the value of the

sensor to see whether the

sensor is dama

ged or not?

NO

Sensor is broken,replace it with new sensor

The indoor PCB is broken, replace with new indoor PCB

H2SM-14/18C03/R2

23

★ □ ★: Indoor EEPROM error: Replace the PCB of indoor unit

■ □ ★:Indoor fan motor malfunction

Ye s

Ye s

YES

NO

whether terminal CN7

and CN11 on indoor PCB

well inserted or not?

Pull out and reinsert the terminals

Electrify the machine again and turn it on in the cooling
operation, Measure voltage between the positions 1 ( red

wire)

and 5( black wire) of Terminal CN1 on the indoor PCB

NO

the indoor pcb is damaged and need replace

. the voltage is about

90-200vac

check whether motor

can run when
turn on the unit

the indoor motor is damaged and need
replace

NO

When motor is running Measure
whether there is voltage
pulse(0-5VDC) between the

positions 2 (middle wire) and

3(

black wire) of Terminal CN7

on the indoor PCB

the indoor motor is damaged and need
replace

the indoor pcb is damaged and need replace

NO

H2SM-14/18C03/R2

24

LED1 of outdoor pcb flashes once: outdoor EEPROM error: Replace the PCB of outdoor unit,

★ □ ■

LED1of outdoor pcb flashes twice: Outdoor ambient Sensor failure CN1,

YES

NO

YES

whether terminal CN1 on

outdoor PCB contact well?

Pull out the terminals on the outdoor mainboard and

reinsert them

Pull the sensor out of the mainboard

3) Measure the value of resistance Between its two

jumpers

4) Measure the temperature of

Outdoor ambient

Check the value of the

sensor to see whether the

sensor is dama

ged or not?

NO

Sensor is broken,replace it with new sensor

The outdoor PCB is broken, replace a new one

H2SM-14/18C03/R2

25

■ ■ ★ :Communication fault between indoor and outdoor system

Yes

NO

Yes

NO
YES

NO

YES

NO

NO YES

NO

YES NO

NO

YES

Check whether the linking cable

between the indoor and outdoor
is not well connected

Reconnect the linking cable;

If unit A have error , please turn
on A and B both，check whether B
is fine

please reverse the outdoor
connecting wires A(C) and B (C)
between unit A and B,

if A is error and B is fine, indoor
unit A PCB is damaged

if A is fine and B has error,the
outdoor unit main PCB is damaged

please check whether the
connecting of L or N is reversed of
the two units

reconnect the L and N wires

Check whether the LED1
on the outdoor pcb is on

the outdoor PCB is damaged

check whether the voltage of
CN7 in outdoor pcb is about
198-253VAC

check whether fuse of outdoor
pcb is broken

reaplace the fuse with
T3.15A 250V

check whether the voltage of
CN4
in outdoor pcb is about 12VAC

check whether the wire from
terminal block to out pcb is well
connected

Reconnect the linking
wire

the transformer is bad

the outdoor PCB is damaged

H2SM-14/18C03/R2

26

LED1 of outdoor pcb flashes 5 or 9 times outdoor unit A or B’s coi sensor failure CN2

YES

NO

YES

whether terminal CN2 on

outdoor PCB contact well?

Pull out the terminals on the outdoor mainboard and

reinsert them

Pull the sensor out of the mainboard

5) Measure the value of resistance Between its two

jumpers

6) Measure the temperature of

outdoor unit A or

B’s coi

Check the value of the

sensor to see whether the

sensor is dama

ged or not?

NO

Sensor is broken,replace it with new sensor

The outdoor PCB is broken, replace a new one

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TROUBLE SHOOTING

27

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28

Trouble shooting

Before asking for service, check the following first.

Normal
Performance
inspection

Noise is heard

Phenomenon

Cause or check points

The system does not restart
immediately.

Smells are generated.

Mist or steam are blown out.

Multiple

check

Does not work at all.

Poor cooling

Application temp. range of air conditioner -7oC~43oC.

When unit is stopped, it won't restart
immediately until 3 minutes have elapsed
to protect the system.
When the electric plug is pulled out and
reinserted, the protection circuit will work
for 3 minutes to protect the air conditioner.

During unit operation or at stop, a swishing
or gurgling noise may be heard. At first 2-3
minutes after unit start, this noise is more
noticeable. (This noise is generated by
refrigerant flowing in the system.)
During unit operation, a cracking noise may
be heard. This noise is generated by the
casing expanding or shrinking because of
temperature changes
Should there be a big noise from air flow in
unit operation, air filter may be too dirty.

This is because the system circulates smells
from the interior air such as the smell of
furniture, cigarettes.

During COOL or DRY operation, indoor unit
may blow out mist. This is due to the sudden
cooling of indoor air.

Is power plug inserted?
Is there a power failure?
Is fuse blown out?

Is the air filter dirty? Normally it should be
cleaned every 15 days.
Are there any obstacles before inlet and outlet?
Is temperature set correctly?
Are there some doors or windows left open?
Is there any direct sunlight through the

curtain)

window during the cooling operation?(Use
Are there too much heat sources or too many

people in the room during cooling operation?

Number

Trouble

phenomenon

Description

Parts that may appear problems

and the Cause

Prepared parts

and tools

Applicable

machine

1

Not work with

remote

controller

Use the

remote

controller to

boot

machine

and it

doesn’t

work

7805,transformer, piezo

resistance, fuse,remote controller,

receiver. If it can be booted by

using manual emergency switch,

that indicate the power cable and

wiring board are electriferousˈ

remote controller or receiver isn’t

well˗else check whether piezo
resistance ,fuse and 7805 are

wellDŽ

7805,transfor

mer, fuse,

piezo

resistance,

remote

controller,

receive,avome

ter

invariable

frequency

split unit

2

Outdoor fan

motor

doesn’t work

Outdoor

fan motor

doesn’t run

when

cooling or

heating

Optical SCR, indoor P.C. board.

Check the 2# and 4# terminal

block of indoor unit, if it has 220V

voltage, wiring board is normal,

then check whether the optical

SCR is good, replace it if it has

flaw˗else check whether there are

something wrong with connecting
lineˈoutdoor fan motor capacitor

and coil assemblyDŽ

Optical SCR,

indoor P.C.

board ,

outdoor fan

motor

capacitor,

outdoor fan

motor,avomet

er

invariable

frequency

split unit

3

Indoor fan

motor

doesn’t work

Indoor fan

motor

doesn’t run

when

cooling or

heating

Optical SCRˈindoor P.C. board DŽ

Check whether indoor fan motor

has 80-170V voltageˈif it hasˈ

wiring board is normal, then check

whether the optical SCR is good,

replace it if it has flaw˗else check

whether there are something

wrong with connecting lineˈindoor

fan motor capacitor and coil

assemblyDŽ

Optical SCRˈ

indoor P.C.

board , indoor

fan motor
capacitor,

indoor fan

motor,avomet

er

invariable

frequency

split unit

4 Not heating

Cooling but

not heating

Indoor P.C. board , four-way valve

coil, body of four-way valveˈCheck

the 2# and 3# terminal block of

indoor unit, if it has 220V voltage
when heating but no when cooling,
then P.C. board is abnormal; else

check whether four-way valve coil

and the body of four-way valve are

damagedDŽ

Indoor P.C.

board ,

four-way valve

coil, body of

four-way

valve,

avometer

invariable

frequency

split unit

Air Conditioner

Edition:2006/1/10

29

Abnormality Diagnosing

5

Indoor unit

make water

Oriented

wind panel

or drain

pan makes

water when

used

Drain pan, drain hose. Check

whether the indoor unit is installed

horizontal, drain hose of indoor

unit is leveled off ,the hole is over

high ˈfilter and drain hose is dirty

and walled upǃdrain pipe is

underwaterDŽ

drain pan,

drain hose

invariable

frequency

split unit

6

Compressor

doesn’t work

running

indicator

lights upˈ

but

compressor

doesn’t

work

Indoor P.C. board , startup capacity
for compressor, overheat protector,

compressor. Check the 1# and 2#

terminal block of indoor unit

whether it has single AVˈif not then

examine the power relay of P.C.

board ˈelse check overheat

protector, startup capacity for

compressor and compressor itself

Indoor P.C.

board , startup

capacity for

compressor,

overheat

protector,

compressor,av

ometer

invariable

frequency

split unit

7

The outdoor

fan motor

and

compressor

don’t work

The

running

lamp of air

conditioner

lights but

the outdoor

fan motor

and

compressor

don’t run

Remote controller ǃelectrolytic

capacitor of 2500UFǃ7805ǃ

outdoor heat exchanger sensor

and ambient temperature sensor.

Use temperature key of remote

controller to watch how much

times the timing lamp glitters and

judge what’s the trouble .If there is

no glitter we should check the

terminal block to see if there is AC

voltage about 220V.Check the
electrolytic capacitor of 2500UF
and see if there is current about

310V.Examine the output of the

7805 and switch transformer

together with the resistance of the

sensor.

Remote

controller ,elec

trolytic

capacitor of

2500UFǃ

7805ǃ

outdoor heat

exchanger

sensor and

ambient

temperature

sensorǃ

avometer

Little split

unit of

frequency

conversion

8

The outdoor

fan motor

runs but the

compressor

doesn’t run

The running

lamp of air

conditioner

lights ,the

outdoor fan

motor works,

but the

compressor

doesn’t work

Power modelǃswitch transformerǃ

compressor. Check the temperature key

of remote controller to watch how many

times the timing lamp glitters and judge

what’s the trouble. Examine the two

ends of PN to see if there is DC voltage

about 310V.Four group DC power

resource of 15V.Check the triphase coil

assembly of the compressor and see if

they are the same.

Power modelǃ

switch

transformerǃ
compressorǃ

avometer

Little split

unit of

frequency

conversion

Air ConditionerEdition:2006/1/10

30

9

Don’t make

heat

The air

conditioner

can

refrigerate

but can’t

make heat

Outdoor P.C. Boardǃ4 way valve

coilǃ 4 way valve body. Examine

the CN204 at Outdoor P.C. Board

and watch if there is 220V

voltage .If there doesn’t have we

can judge that the P.C. Board is

bad. If there has, we need to

connect and check the whether the

4 way valve coil and the 4way

valve body have been damaged .

Outdoor P.C.

Boardǃ4way

valve coilǃ 4

way valve

bodyǃ

avometer.

Little split

unit of

frequency

conversion

10 Show error

code E8

The

machine

doesn’t

work and

shows error

code E8

Multimeter negative generatorǃ

indoor P.C. board ǃconnecting and

inserting lines .Check if the

Multimeter negative generator is

plane and the grounding (CF) is
touching well, then examine not

only whether the indoor P.C. Board

and control board have been

damaged or not but also the

connecting lines are good.

Multimeter

negative

generatorǃ

indoor P.C.

Boardǃ

control

board ǃ

grounding

(CF)ǃ

avometer.

The series

of

frequency

fixed

cabinet

type

11 Can’t start

The air

conditioner

can’t start

Transformerǃindoor

microcomputer plateǃfuse. Check

if the transformer has been

burned. power wave filterǃ

LX102.Check whether the fuse

and indoor microcomputer plate

have been damaged.

Transformerǃ

power wave

filterǃindoor

microcompute

r plateǃfuseǃ

avometer.

The series

of

frequency

fixed

cabinet

type

12

Show error

code F11

When the

air

conditioner

has run

about

5minutes

the indoor

unit shows

the error

code F11.

The system pressureǃoutdoor P.C.

BoardǃPower source voltageǃ

power modelǃthe connecting lines

of compressor. The cause is that

protective action has been taken

when it runs with large burden,
there is more refrigerant than it

should be .Examine the outdoor

P.C. BoardǃPower source voltageǃ
power model and see whether they

have been damaged and the

connecting lines touch well, if not,

adjust it to be normal.

outdoor P.C.

BoardǃPower

source

voltageǃpower

model .

The

machine of

frequency

conversion

split unit

Air ConditionerEdition:2006/1/10

31

Air Conditioner        Edition:2005/11/18

INSTALLATION

32

Air Conditioner

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Edition:2006/1/10

12

12

C

8

D

15

E

Air Conditioner

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Edition:2006/1/10

3/8

Air Conditioner

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Edition:2006/1/10

Air Conditioner

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Edition:2006/1/10

Air Conditioner



Edition:2006/1/10

Indoor unit A

Indoor unit B

YEL/GRN

RED

1 2 3

1 2 3

BLK

WHT

YEL/GRN

RED

BLK

WHT

WHT

BLK

WHT

BLK

RED

RED

POWER

YEL/GRN

YEL/GRN

BRN

BLU

{

YEL/GRN

1(L)

2(N)

3(R)

1(L)

2(N)

3(R)

1(L)

2(N)

Outdoor unit

5

Air Conditioner



Edition:2006/1/10

Air Conditioner



Edition:2006/1/10

3.The purging Method of the indoor unit B is the same as the indoor unit A.
The unit A and unit B are seperated and disconnected connected for the different compress.

9.52

9.52

3/8

3/8

1.Cut pipe

3.Insert the flare nut

4.Flare pipe

2.Remove burs

0~0.5mm 1.0~1.5mm 1.5~2.0mm

Flare tool for R410A

Clutch-type

Conventional flare tool

clutch-type(Rigid-type)

Wing-nut type (Imperial-type)

Air Conditioner

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Edition:2006/1/10

Air Conditioner

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Edition:2006/1/10

Air Conditioner

       

Edition:2005/11/18

CIRCUIT AND WIRING DIAGRAM

H2SM-14/18C03/R2

43

1 2 3 4 5 6 78

A

B

C

D

8

7654321

D

C

B

A

R17
10k

C12
102

C13
104

C16
102

12345

CN13

13

2

XT1

8M

R15
10k

R24
10K

R18

4.7k

R41

1K

R52
10K

+5

C5 102

R30
10K

R28 1K

R27 10K

+5

R29 10K

Q2
2SC2412

Q1
2SC2412

1

2

CN9

1

2

ZJ1

1
2
3

CN7

+5

C43
103

+5V

R50

51K

R14 1K

+5

IC10

TLP3526

1
2
3

CN1

C39

2UF 450V

+5V

R57

220

R42

3456
7
8 1

2

IC2

24C02

+5

E6

4.7UF/50V

E7 4.7UF/50V

1
2
3
4

CN8

R44 1K

R45 1K

R35 3.3K 1%

R34

20K 1%

+5

C2 104

R46

1K

C15
102

C10
102

C9
102

Q4

2SC2412

SDA
SCL

1234567

89

10111213141516

IC4

2003

C

D

B
A

+12

C4

104

+5

C6

103/50V

E5
100u/16v

C18
104/50V

+5

R65
10k

C36

103/50v

.

RL1

JQ1A-12V

+12

R20 10K

+5

R10 10K

1

2

3

4

CN6

R36

1K

R37

10K

+5V

R8

10K

+5V

R7

10K

C14
104

BUZ1

BEEP-PKM13EPY-4002

Q5
2SC2412

R11

10K

R49
100

R9

4.7K

R1
1M

R31
10K

+12V

C41
102

R2

10K

R3

1K

C1
102

+5V

02 IRQ
07

08

PTF4/TBCH0

PTF3/TBCH3

48
49

PTH1/KBD3
PTH1/KBD4

03

RST

21

VSS GND

GNDAVSS/VRE

45

60

PTC0
PTF7

10

13

PTE0/TXD

56

VSSA GND

14

PTE1/RXD

PTE2/TACH0

15
25

PTG2/KBD2
PTE3/TACH1

16
17

PTE4/SS

18

19
20

PTE5/MISO

PTE6/MOSI
PTE7/SPSCK

PTC4

01

26

PA0

27

PA1

28

PA2

29

PA3

30

PA4

31

PA5

32

PA6

33

PA7

38 PTB4

R32
10K

50 PTD4

34

PTB0/ATD0

35

PTB1/ATD1

39

40

41

42

43

46

PTB5/ATD5

PTD6/ATD6

PTB7/ATD7

PTD0

PTD1

PTD2

47PTD3

VDDAREF 44

06
05

PTF1/TACH3

PTF2/TBCH2

57

CGMXFC

54

55

VDDA

VREFH

5958OSC1

OSC2

51PTD5

PTD6/TACLK 52

53

62

63

64

PTD7

PTC2/MCLK

PTC3

PTC5

PTF0/TACH2 04

22

36
37

PTB3/ATD3

PTB2/ATD2

VDD

09

NC

61

23
24

PTC1

PTG1/KBD1

PTG0/KBD0

1

CON1(ｒｅｄ)

C19
104

MC68HC908AB32

+12v

R13 10K R12

10K

R26
10K

5v

11
12

PTF5
PTF6

C7

104/50V

C3
103

C29
104/50v

R53 1K

SW1

220V-N

R59

4.7K

1

CON2(ｗｈｉｔｅ)

220V-L

220V-N

R66 27

C25

102/50V

C27

102/50V

C26

102/50V

C47

104/50V

E13
100u/25v

R69 10K
R68 10K
R67 10K

R70 560
R71 560
R72 560

53

52

51

R88 560

C38

102/50V

61

R16
10k

+5

R21 10K

SW2

R73
10K

D6

1N4007

1

CON5

R81

330K 1/4W

R82

330 1/4W

C22

102

R85 2.2K 1/4W

R87

10K 1/4W

+5

R86

10K 1/4W

R80

2.2k 1/4W

IC12

TLP421

+5

R83

2.2K

1

N

C49

103/50V

R84

6.8K 2W

LED1

GREEN

+5

Q9
2SC2412

IC14
TLP371

+5

1
24

5

6

1
2

3

4

D8

1N4007

Q3

2SC2412

R4 4.7K

R38 10K

+5V

R39 4.7K

Q10

2SC2412

D7

RLS4148

R64 10K

R40

10K

+5V

R8922K

R91

4.7K

5v

SW3

R92
10K

R93
10K

Q11

2SC2412

D1-D4

IN4007

FUSE

3.15A

T1

D5

1N4007

E8

2200UF/25V

Z1

561K

C40

104/275V

CN4

B2P3-VH-A

IC9

7805

CN3

0-171825-3

CN2

RTB-1.5-2P

C35
104

+12+5

C17
104

R51

3.3K

Q8
2SB1197

R54
680

R43

3.3K

1

2

3

4

5

6

7

CN5

SJ20-07WX

R47 560 1/4W

R5

10K

C24

0.01u/275V120 1W

L1
125uH

+5

R58 10K

R25
10K

R6

10K

R97

10K

R95

10K

R96

10K

R98

10K

R33

10K

5v

+5V

+5V

E4
100u/16v

C28
104/50V

+5

E15

470UF/16V

C42
104/50V

+12

E9

100u/25v

Air Conditioner



Edition:2006/1/10

W:

Air Conditioner



Edition:2006/1/10

Sincere Forever

Haier Group

Haier Industrial Park, No.1, Haier Road

266101, Qingdao, China

http://www.haier.com

Air Conditioner



Edition:2006/1/10