This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
repair the product or products dealt with in this service information by anyone else could result in serious injury or death
2012
All right reserved .Unauthorized copying and distribution is a violation of law
Note:The dada are based on the conditions shown in the table below.
Outdoor:35
Indoor:80.6DB/66.2WB
Outdoor:95
DB/24 WB
F
DBF
/75.2
F
F
WB
Conversion Formulae
Outdoor:44.6
kal/h=kWx860
Btu/h=kWx3414
cfm=m³/minx35.5
Indoor:68
htgneLgnipiPgnitaeHgnilooC
DB
F
F
/42.8
DBF
WB
16 2/5 feet
HSU09/12XHK-SM
Connecter Wring Diagram
4.Printed Circuit Board Connector Wiring Diagram
4.1 Indoor unit
Connectors Indoor PCB
1)CN1connector for transformer.
2)CN2 connector for power line.
3)CN3 connector for transformer.
4)CN5”˄1˅connector for up and down step motor.
5)CN6 connector for ambient temp. sensor and piping temp.sensor.
6)CN7 connector for receiver display.
7)CN8 connector for AC fan speed .
8)CN9 connector for AC fan motor.
CN8
CN7CN5”˄1˅
CN1
CN9
CN6
CN2
CN3
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Domestic Air Conditioner
HSU09/12XHK-SM Functions and Control
5ˊFunctions and Control
5.1 main functions and control specifications
Including brief introduction to air conditioners of series models and electric control function.
5.1.1 Automatic running mode
(1) Single cold automatic run mode:
After entering into this mode, the main control “MCU” determines the corresponding work pattern
according to the indoor temperature so as to maintain the preset temperature (the preset temperature is 78°F).
When the indoor temperature is below 78°F, outlet air from compressor is off, the automatic wind from fan
motor is low, and wind can be set to high, medium or low by hand. When the indoor temperature is or above
78°F, the unit enters the cooling mode and conducts the cooling programme (the preset temperature is 78°F),
outlet air from compressor is on and indoor fan motor run in fixed wind speed.
(2) Automatic running mode
When the running mode is turned to automation after starting the system, the system will first determine
the running mode according to the current room temperature and then will run according to the determined
mode.Tr in the following selection conditions means room temperature, Ts means setting temperature, Tp
means temperature of indoor coil pipe
a. Tr≥74°F running cooling mode
b. Tr<74°F running heating mode
After turning to the automation mode, the running mode can be switched between cooling mode, fan
mode and heating mode according to the change of the indoor ambient temperature. But the automatic
conversion between cooling mode and heating mode must be conducted after 15 minutes.
5.1.2 Indoor temperature control
Temperature control range : 60°F ---86°F
Temperature control precision: r2°F
Compressor can’t be controlled by temperature sensor within 2 minutes after it starts
5.1.2.1 Cooling mode:
When Tr> Ts, outdoor fan motor and compressor on, and indoor fan motor run at fixed wind speed. When Tr
Ts, outdoor fan motor and compressor off, and when Tr > Ts, outdoor fan motor and compressor are working
again .If Tr=Ts, the indoor fan motor , outdoor fan motor and the compressor’s state will not change.
5.1.2.2 Heating mode:
When Tr d Ts, compressor, four-ways valve and outdoor fan motor is on, indoor fan
motor runs as in cold blast avoidance mode, and 7°F of compensation is added after compressor is started.
When Tr>Ts+9°F, compressor is off, and the indoor fan motor runs as in cold blast avoidance mode.
When Tr<Ts+9°F, compressor, four-ways valve and outdoor fan motor is on, and the indoor fan motor runs
as in cold .
5.1.3 Cooling run mode:
temperature control range : 60°F ---86°F
temperature control precision: r2°F
compressor can’t be controlled by temperature sensor within 2 minutes after it starts.
control character: when Tr t Ts, outlet air from compressor is on and indoor fan motor run at fixed wind
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Domestic Air Conditioner
HSU09/12XHK-SM Functions and Control
喚
speed. When Tr Ts, outlet air from compressor is off , and when Tr > Ts, outlet air from compressor is on.
wind speed control: (the temperature difference is 2°F)
auto: When Tr≥Ts+9°F, the wind speed is high;
When Ts+1°F dTrǂTs+5°F, the wind speed is medium.
When TrǂTs+1°F, the wind speed is low.
When temperature sensor is off, the fan motor runs at low speed.
when the wind speed changes from low to high, there is no delay, and when it changes from high to low,
there is a 3-minutes delay before conversion.
Manual operation:When unit is on the wind speed can be set to high, medium, low or automatic as
required (execute instruction 2 seconds later after receiving remote signal)
Compressor control喚The compressor can’t be controlled by temperature sensor within 2 minutes after
start up and can be only restarted at least 3 minutes later after shutdown. There is no 3-minute protection with
power on for the first time (over 3 minutes with power off). The compressor must stands by for 3 minutes
before it is restarted after shut down.
There is no 2-minute limit when changing the temperature setting or shutting down the machine through
the remote controller, and the machine can be shut down immediately.
Avoiding electrical shock: outlet air is available 2 seconds later after startup.
High temperature expiration protection:
(1)High temperature expiration prevention:When the temp.of coil pipe is above 161°F,compressor and
outlet air stop running 10 seconds later, and inlet air runs as the temp. sensor is off. When compressor stands
by for 3 minutes and the temp. of coil pipe is below 149°F, the unit can be started again.
Protection of frost is available (disable in test run or heating mode): In order to prevent the indoor heat
exchanger from freezing (in cooling or dehumidifying mode), the compressor will be shut off when the
temperature of the indoor coil pipe is or below 30°F and the compressor runs for over 5 minutes. When the
temperature of the indoor coil pipe ascends to over 44°F, the compressor is restarted (must meet a 3-minutes
delay)
Timer on, Timer off and sleep control are available.
5.1.4 Dehumidifying mode
Temperature control range : 60°F ---86°F
Control character:
When Tr (indoor temperature) > Ts (temperature setting) +3°F, compressor and outdoor fan motor run
continuosly with indoor fan motor runnig in accordance with the wind speed setting(State 1).
When Ts d Tr d Ts +3°F, outlet air from compressor is on for 10 minutes and off for 6 minutes, the indoor
fan motor is off in 3 minutes after shut down of compressor and gives breeze in other time(State 2).
When Tr < Ts, outlet air from compressor is unavailable, and the indoor fan motor enter breeze mode 3
minutes later after after shut down of compressor(State 3).
When all the ranges alternate, there is ±2°F difference.
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Domestic Air Conditioner
HSU09/12XHK-SMFunctions and Control
5.1.5 Heat in g mode:
*Temperature control range : 60°F ---86°F
*Temperature control precision: 2°F
*Control Character:
When Tr ≤ Ts, compressor, four-ways valve and outdoor fan motor is on, indoor fan motor runs as in cold
, and 7°F of compensation is added after compressor is started.
When Tr>Ts+9°F, compressor is off, and the indoor fan motor runs as in warm blast mode.
When Tr<Ts+9°F, compressor, four-ways valve and outdoor fan motor is on, and the indoor fan motor
runs as in cold .
*Control of indoor fan motor:
Manual operation: The wind speed can be set to high, medium, low or automatic as required.
Automatic operation: When Tr < Ts, the wind speed is high;
When Ts ≤ Tr≤ Ts+3°F, the wind speed is medium.
When Ts+3°F ≤ Tr, the wind speed is low.
*Control of air door: setting the position of air door as required.
*Compressor control喚The compressor can’t be controlled by temperature sensor in 2 minutes after start
up and also can’t be started again at least 3 minutes later after shut down. There are 3-minute protection with
power on for the first time (over 3 minutes with power off). The compressor must be started again 3 minutes
later after shut down.
*Avoiding electrical shock: outlet air is available 2 seconds later after start up.
*Timer on, Timer off and sleep control are available.
*Control of 4-way valve: When the unit is started for the first time, the 4-way valve starts runnig 10
seconds earlier than compressor does. After compressor stops runnig, the 4-way valve continues running for
2 minutes and then stops. If changing the unit from heating to cooling, the 4-way valve is shut off 2 minutes
later and compressor is started 3 minutes later.
5.1.5.1 Cold draf t pr evetion:
5.1.5.1.1 Compressor is interrupted during the defrosting operation and continues to run after
defrosting is completed. When the indoor exchanging temperature is below 73°F, the indoor fan motor is off.
When the indoor exchanging temperature is above 73°F, the indoor fan motor is running at weak speed.
5.1.5.1.2 If the temperature of coil pipe can’t be above 100°F 4 minutes later after start up, fan motor
is running at the preset wind speed.
5.1.5.1.3 If the temperature of coil pipe is above 100°F 4 minutes later after start up, fan motor is
running at the preset wind speed.
5.1.5.1.4 If coil pipe descends to the temp. lower than 100°F from 100°F. fan motor is running at the
preset wind speed.
*Warmblast: If the temperature sensor is off. Compressor stops runnig. If the temperature of coil pipe is
above 73°F, fan motor enter breeze mode; and if the temperature of coil pipe is below 68°F, fan motor stops
running.
5.1.5.2 High temperatur e prote ction and high temperature expiration protection:
5.1.5.2.1 High temperature prevention: When the temp. of coil pipe is above 132°F, the outdoor fan
motor stops.When the temp descends to 125°F, the outdoor fan motor is restarted ,fan should keep stopping
more than 45 seconds.
5.1.5.2.2 High temperature expiration prevention:When the temp.of coil pipe is above 143°F,compressor
and outlet air stop running 10 seconds later, and inlet air runs as the temp. sensor is off. When compressor
stands by for 3 minute and the temp. of coil pipe is below 122°F, the unit can be started again.
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Domestic Air Conditioner
HSU09/12XHK-SM Functions and Control
*Current protection and current expiration protection: (Not detecting within 60 seconds after start up)
*Overcooling protection˖One and half a minutes later after compressor starts, if the temperature of coil
pipe is below 2°F, compressor and air outlet stop, and air inlet runs according to the temp. setting.
Compressor can be restarted 3 minutes later.
5.1.5.3 Defrosting:
5.1.5.3.1 Entry conditions of defrosting:
The entry conditions of defrosting is classified into two types: intelligented defrosting and sensor
defrosting. Through selecting and judging, the models without outdoor sensor defrosts according to
intelligented defrosting, and others with ensor defrosts according to sensor defrosting.
Intelligented defrosting:
5.1.5.3.1.1 Indoor unit enter overload protection and air outlet stops when air outlet has been restarted
and runs over 10 minutes, and compressor runs over 45 minutes in total and over 20 minutes continuously,
and the temp. of indoor coil pipe is below 100°F.
5.1.5.3.1.2 Compressor runs 20minutes continuously, and the temp. of indoor coil pipe decreases 2°F
per 6 minutes and this operation repeats 3 times, and the temp. of coil pipe is below 100°F, and 5 minutes
later after compressor is restarted.
5.1.5.3.1.3 When compressor runs over 3 hours in total and over 20 minutes continuously and after
the temp. of indoor coil pipe is below 100°F, the system enters defrosting mode.
5.1.5.3.1.4 The difference between the temp. of indoor coil pipe and the indoot temp. is below 60°F and
lasts 5 minutes, compressor runs over 45 minutes in total and over 20 minutes continuously after the temp. of
indoor coil pipe is below 100°F, the system enters defrosting mode.
5.1.5.3.2 Exit conditions of defrosting:
Defrosting time is higher than 12 minutes (compressor is on).
5.1.5.3.2.1 During the defrosting, if current peak value is cut off, the unit quit the defrosting mode. But
the protection of expiration of current peak value is unavailable with 60 senconds after compressor is started.
5.1.5.3.2.2 During the defrosting and 2 minutes After quiting the defrosting mode, abnormality of temp.
sensor isn’t detected.
5.1.5.3.2.3 After quiting the defrosting mode, the fan motor enter cooling prevention mode.
5.1.5 Timer function:
You can set 24-hour timer on or timer off as required, and the minum time unit is 1 minute. After setting,
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Domestic Air Conditioner
HSU09/12XHK-SMFunctions and Control
the indicator of indoor unit is on , and it is off when timer setting is completed. There are several timer mode
as follows.
5.1.5.1 Timer on: The LED of “timer on” lights up, and unit behaves with halt status. Timer on is
completed, and then unit starts running with the LED of “timer on” off. The unit starts with the the last setting
receiving timer signals, and sleep setting is not allowed.
5.1.5.2 Timer off: Unit starts, timer indicator lights up; When reaching time setting, the indicator goes out,
unit enters shut down mode, and sleep function can be set. If timer off and sleep are set synchronously, the
one which time is short run first. Executing shutdown instruction clear timer and sleep function.
5.1.5.3 Timer on and timer off can be set synchronously.
5.1.6 Sleep function:
the timer indicator lights up.
5.1.6.1 In cooling/defrosting mode, the temp. setting increases 1°F one hour later after start up. After
another hour the temp. setting increase by more 1°F and then run continuously for another 6 hours and then
close.
5.1.6.2 In heating mode, the temp. setting decrease 3°F one hour after start up. After another hour the
temp. setting decrease by more 3°F. After 3 hours the temp. setting rise by 1°F and then run continuously for
another 3 hours and then close.
5.1.6.3 If the wind speed is set to high before going to bed, the wind speed become medium after start
up; If the wind speed is set to medium before going to bed, the wind speed become low after start up; If the
wind speed is set to low before going to bed, the wind speed keep unchanged.
5.1.7 Emergency switch imput:
5.1.7.1 Press the switch of emergency operation, then buzzer rings once and unit enters the automatic
operation mode. (emergency operation)
5.1.7.2 If the switch is kept pressed for 5 seconds, buzzer ring two times and unit enter enter test run
mode.
5.1.7.3 Press the switch again, and then closes.
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Domestic Air Conditioner
HSU09/12XHK-SM Functions and Control
喚
5.1.7.4 Enter emergency operation from timer mode, then timer is cancelled.
5.1.8 Test run:
5.1.8.1 The temperature sensor of inlet air doesn’t work, and compressor starts (but subject to the limit
of -minute delay excluding the first time), and high wind, cooling, and air door is open.The indoor fan motor
runs, running indicator lights up, compressor relay and the one of outdoor fan motor is closed
5.1.8.2 During test run:
The prevention of freezing of evaporator doesn’t work.
Current cross control doesn’t work.
The control of current cross peak expiration doesn’t work.
Temperature control doesn’t work.
Temperature expiration control doesn’t work.
5.1.9memory function
The memory function of power down is available, and the auto recovery function of power on is optional. (In
auto, heating, cooling, or defrosting status, press the “
dispay to
10 times within 6 seconds, and the auto recovery function of power on can be set on/off. If the buzzer rings 4
times, the the auto recovery function of power on is available; If the buzzer rings 2 times, the the auto
recovery function of power on is unavailable.)
If there is no EEPROM, the unit is taken off the ‘off’ function of the memory function of power down. But
the memory function of power down can also be set on/off, and the data is the default value of chip.
5.1.10 Alarm from indoor fan motor:
2 minutes later after the indoor fan motor is charged, and the impulse from fan motor is not detected, hen
send alarm signals.
喌 will flash喌and then press 喌quickly press 喌and then press 喌rapidly