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
Edition:2006/1/10
Air Conditioner
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
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
Air Conditioner
Edition:2006/1/10
Air Conditioner
Edition:2006/1/10
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℃
Air Conditioner
Edition:2006/1/10
2
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
Air Conditioner
Edition:2006/1/10
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