Haier AS18ND1HRA-WHITE User manual

SERVICE MANAUL
Wall Mounted Type
DC Inverter FREE MATCH N-Series
AS18ND1HRA-WHITE
HSU18VHGL-G
Model No.
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
WARNING
2014 (Qingdao Haier Air Conditioner General corp. , Ltd)
All rights reserved. Unauthorized copying and distribution is a violation of law
Haier Group Version：V1 Date：2014-05-25

Table ofcontents
Domestic air conditioner
Contents
1. Introduction............................................................................................ 1
2. Features ................................................................................................ 7
3. Specifications ........................................................................................ 8
4. Sensors list............................................................................................ 9
5. Piping diagrams.....................................................................................10
6. Printed Circuit Board Connector Wiring Diagram..................................11
7. Functions and Control ...........................................................................
8. System configuration.............................................................................
9. Dimensional drawings ...........................................................................
10. Conter of gravity..................................................................................
11. Service Diagnosis................................................................................
12. Circuit diagrams ..................................................................................
14
59
43
42
42
25

Introduction
Domestic air conditioner
1 Introduction
1.1 Model name explanation
A S 1 8 N D 1 H R A
Indoor unit
Type of indoor unit: S (wall-mounted)
Nominal cooling capacity (18000BTU/h)
Version number
Heat pump & R410A refrigerant
DC inverter
Apply toT1; 208~230V60HZ/1ph
1
Platform of indoor units: N (N platform)
50N Platform

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1.2 Safety Cautions
Be sure to read the following safety cautions before conducting repair work.
The caution items are classified into “Warning” and “Caution”. The “Warning” items are especially important
since they can lead to death or serious injury if they are not followed closely. The “Caution” items can also lead
to serious accidents under some conditions if they are not followed. Therefore, be sure to observe all the safety
caution items described below.
About the pictograms
△ This symbol indicates an item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
○This symbol indicates a prohibited action.
The prohibited item or action is shown inside or near the symbol.
●This symbol indicates an action that must be taken, or an instruction.
The instruction is shown inside or near the symbol.
After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates
Normally, and explain the cautions for operating the product to the customer.
1.2.1 Caution in Repair
Warning
Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for
a repair.
Working on the equipment that is connected to a power supply can cause an electrical shook.
If it is necessary to supply power to the equipment to conduct the repair or inspecting the circuits, do not
touch any electrically charged sections of the equipment.
If the refrigerant gas discharges during the repair work, do not touch the discharging refrigerant gas .The
refrigerant gas can cause frostbite.
When disconnecting the suction or discharge pipe of the compressor at the welded section, release the
refrigerant gas completely at a well-ventilated place first.
If there is a gas remaining inside the compressor , the refrigerant gas or refrigerating machine oil
discharges when the pipe is disconnected, and it can cause injury.
If the refrigerant gas leaks during the repair work, ventilate the area. The refrigerant gas can generate
toxic gases when it contacts flames.
The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit.
Be sure to discharge the capacitor completely before conducting repair work . A charged capacitor can
cause an electrical shock.
Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug.
Plugging or unplugging the power cable plug to operate the equipment can cause an electrical shock or
fire.
2

Intuoduction
Domestic air conditioner
Warning
Do not repair the electrical components with wet hands . Working on the equipment with wet hands can
cause an electrical shock
Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical
shock.
Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid
electrical
shock.
Be sure to turn off the power switch and unplug the power cable when cleaning the equipment. The
internal fan rotates at a high speed, and cause injury.
Do not tilt the unit when removing it. The water inside the unit can spill and wet the furniture and floor.
Be sure to check that the refrigerating cycle section has cooled down sufficiently before conducting
repair
work. Working on the unit when the refrigerating cycle section is hot can cause burns.
Use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen
deficiency.
1.2.2 Cautions Regarding Products after Repair
Warning
Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to
conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools can
cause an electrical shock, excessive heat generation or fire.
When relocating the equipment, make sure that the new installation site has sufficient strength to
withstand the weight of the equipment.
If the installation site does not have sufficient strength and if the installation work is not conducted
securely, the equipment can fall and cause injury.
Be sure to install the product correctly by using the provided standard installation frame.
Incorrect use of the installation frame and improper installation can cause the equipment to fall, resulting
in injury.
For
integral
units only
Be sure to install the product securely in the installation frame mounted on a window frame.
If the unit is not securely mounted, it can fall and cause injury.
For
integral
units only
3

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Warning
Be sure to use an exclusive power circuit for the equipment, and follow the technical standards related to
the electrical equipment, the internal wiring regulations and the instruction manual for installation when
conducting electrical work.
Insufficient power circuit capacity and improper electrical work can cause an electrical shock or fire.
Be sure to use the specified cable to connect between the indoor and outdoor units. Make the
connections securely and route the cable properly so that there is no force pulling the cable at the
connection terminals.
Improper connections can cause excessive heat generation or fire.
When connecting the cable between the indoor and outdoor units, make sure that the terminal cover
does
not lift off or dismount because of the cable.
If the cover is not mounted properly, the terminal connection section can cause an electrical shock,
excessive heat generation or fire.
Do not damage or modify the power cable.
Damaged or modified power cable can cause an electrical shock or fire. Placing heavy items on the
power cable, and heating or pulling the power cable can damage the cable.
Do not mix air or gas other than the specified refrigerant (R-410A / R22) in the refrigerant system.
If air enters the refrigerating system, an excessively high pressure results, causing equipment damage
and injury.
If the refrigerant gas leaks, be sure to locate the leak and repair it before charging the refrigerant. After
charging refrigerant, make sure that there is no refrigerant leak.
If the leak cannot be located and the repair work must be stopped, be sure to perform pump-down and
close the service valve, to prevent the refrigerant gas from leaking into the room. The refrigerant gas
itself
is harmless, but it can generate toxic gases when it contacts flames, such as fan and other heaters,
stoves and ranges.
.
When replacing the coin battery in the remote controller, be sure to disposed of the old battery to prevent
children from swallowing it.
If a child swallows the coin battery, see a doctor immediately.
4

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Caution
Installation of a leakage breaker is necessary in some cases depending on the conditions of the
installation site, to prevent electrical shocks.
Do not install the equipment in a place where there is a possibility of combustible gas leaks.
If a combustible gas leaks and remains around the unit, it can cause a fire.
Be sure to install the packing and seal on the installation frame properly. If the packing and seal are not
installed properly, water can enter the room and wet the furniture and floor.
1.2.3 Inspection after Repair
Warning
Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet
all the way.
If the plug has dust or loose connection, it can cause an electrical shock or fire.
If the power cable and lead wires have scratches or deteriorated, be sure to replace them.
Damaged cable and wires can cause an electrical shock, excessive heat generation or fire.
Warning
Do not use a joined power cable or extension cable, or share the same power outlet with other electrical
appliances since it can cause an electrical shock, excessive heat generation or fire.
5

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Caution
Check to see if the parts and wires are mounted and connected properly, and if the connections at the
soldered or crimped terminals are secure. Improper installation and connections can cause excessive
heat generation, fire or an electrical shock.
If the installation platform or frame has corroded, replace it. Corroded installation platform or frame can
cause the unit to fall, resulting in injury.
Check the grounding, and repair it if the equipment is not properly grounded. Improper grounding can
cause an electrical shock.
Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 M
ohm or higher.
Faulty insulation can cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.
Faulty drainage can cause the water to enter the room and wet the furniture and floor.
1.2.4 Using Icons
Icons are used to attract the attention of the reader to specific information. The meaning of each icon is described in
the table below:
1.2.5 Using Icons List
Icon Type of Information Description
Note
Note
A “note” provides information that is not indispensable, but may
nevertheless be valuable to the reader, such as tips and tricks.
Caution
Caution
A “caution” is used when there is danger that the reader, through
incorrect manipulation, may damage equipment, loose data, get
an
unexpected result or has to restart (part of) a procedure.
Warning
Warning
A “warning” is used when there is danger of personal injury.
Reference
A “reference” guides the reader to other places in this binder or in
this manual, where he/she will find additional information on a
specific topic.
6

Specifications
Domestic air conditioner
2.Features
7
Super quiet: Lower noise operation condition
A-PAM DC inverter:With adoption of S-TYPE,S-PAM and PHASE control technology to works more
stably at low-frequency,and is more energy-saving,mor powerful at high frequency.
Long distance air supplying:
5 F°Heating: When 5 °F can still heating natural
50 °F heating maintenance:Heating Holding 50°F temperature
Confortable sleep：The setting temperature and the indoor noise can be adjusted to a more comfortable
level when you set the “sleep mode” during night sleep.
Super match:One outdoor unit can match two or more indoor unit.
DIY auto mode: Adjust the last fixed operation mode automatically.
Turbo mode: Quick cooling or heating
Auto restart: Automatic return to previous operation conditions after sudden power blackout
24 hours timer: Use the timer function to set on,or off,or from on to off,or from off to on.
Intergrative valve cover:The valve cover is Intergrative.
2-way piping design: The pipe can shoot out both from left or right side.
Easy clean design: The panel is easy to wash and the airflow vents can be detached easily
Double 8 display:The display is Double 8 mode.

Specifications
Domestic air conditioner
3 Specifications
NOMINAL DISTRIBUTION SYSTEM VOLTAGE
1/esahP
05zHycneuqerF
032VegatloV
NOMINAL CAPACITY and NOMINAL INPUT
cooling heating
Capacity rated Btu/h 17000(4780-13300) 18000(5120-13990)
Power Consumption(Ra 50685222Btu)det
38/BtuBtuPOC/REE
hWKnoitpmusnocygrenelaunnA 999950 6252250
h/³inlavomeRerutsioM 70.62*10 ³
TECHNICAL SPECIFICATIONS
1.06×0.77×3.21inD*W*HsnoisnemiD
1.32×1.08×3.56inD*W*HsnoisnemiDdegakcaP
28.6lb/thgieW
35.2lb/thgiewssorG
etihW//roloC
Sound level
Sound
peessure(high/medium/low) dB
Sound power(high) dB
8
-
57/54/51
38
/

Specifications
Domestic air conditioner
TECHNICAL SPECIFICATIONS-PARTS
cooling heating
Fan
nafwolfssorCepyT
136.5WtuptuorotoM
Air flow rate(high) in³/h 31779 31779
Speed(high/middle/low) rpm 950/850/750 900/800/700
Heat exchanger Type ML fin-φ7HI-HX tube
4.1*81*3hctif*egats*tnemgeS
hgiRlortnocnoitceridriA t,Left,Horizontal,Downward
Air filter Removable/Washable/Mildew Proof
Temperature control Microcomputer Control
HD01-RYledomrellortnocetomeR
Note: the data are based on the conditions shown in the table below
htgnelgnipiPgnitaehgnilooc
16.4in
4．Sensors list
type Description Qty
1erutarepmetmoorgnitcetedrofdesustIrosnesmooR
Pipe sensor Its used for detecting temperature of evaporator 1
Conversation formulae
Kcal/h= KW×860
Btu/h= KW×3414
cfm=m³/min×35.3
9
136.5
Indoor: 80.6°
F
DB/66.2°
F W B
Outdoor: 95°
F DB/75.2° F W B
Indoor:68°
F D B
Ou t doo r :44.6°
F D B / 42.8° F
W B

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5．Pinping diagrams
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10

Connector Wiring diagrams
Domestic air conditioner
6. Printed Circuit Board Connector Wiring Diagram
11
Connectors
PCB(1) (Control PCB)
daolhtiwtcennoC
rotcennocBCPseires
1 CN9 Connector for fan motor
2 CN6 Connector for heat exchanger thermistor and Room temperature thermistor
3 CN5
Connector for UP&DOWN STEP motor
4 CN21 Connector for power N wire
5 CN52 Connector for power L
6 CN27
7 CN7
8 CN23 Connector for communicate between the indoor board and the outdoor board
9 CN34
Connector for power GRN
Connector for display board
Note: Other designations
PCB(1) (Indoor Control PCB)
1) CN14 Connector for Forced operation ON / OFF switch
2) SW2 1 Select remote code A or B,2 Select room card able or disable , 3-4 Select 23,26,33,or 35
3) RV1 Varistor
4) FUSE1 Fuse 3.15A/250VAC
Connector for long-range control

Connector Wiring diagrams
Domestic air conditioner
12
PCB(1)
C23
CN21
CN7
CN14
CN6
CN52
CN34
CN9
CN5
CN27

Connector Wiring diagrams
Domestic air conditioner
Wiring diagrams
13
up-down stepmoter
ION GENERATIOR
Y/G
C0N2
C0N3
DC FAN MOTOR
M
FUSE1
SW1
EMERGENCY SWITCH
RECEIVER
DISPLAY
CN7
T3.15A/250VAC
80
120
1
(N) (C)
3 (L) 2
WB
Y/G
Y/G
GND
CN14
AMBIENT TEMP SENSOR
PIPING TEMP SENSOR
CN6
CN10
Right stepmoter
left stepmoter
CN11
CN5
CN5-1 CN5-2
R
C0N1
BL
Fresh air
(L)
CN21
N
S
CN51
Room card
R
W
@
@
CN9
CN52
CN23

Functions and Control
Domestic air conditioner
7.Funcitions and Control
7.1 Main functions and control specification
7.1.1 Automatic operation
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
Tr 73.4°F Choose Cooling Mode
Tr Choose 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.
7.1.2 Cooling operation mode
Temperature control range: 60.8 °F---86°F
Temperature difference: 33.8°F/30.2°F
* Control features: When Tr input airflow >Ts set temperature °F, the compressor will be opened, the indoor
fan will operate at the set speed and the mode signal will be sent to the outdoor system. When Tr input
airflow Ts set temperature °F, the compressor will be opened, the indoor fan will operate at the set speed
and the mode signal will be sent to the outdoor system. The system will keep the original status if Tr= Ts.
Airflow speed control: (temperature difference 33.8°F）
Automatic: When Tr Ts+37.4°F, high speed.
When Ts+33.8°F Tr<Ts+37.4°F, medium speed
When Tr<Ts+33.8°F , low speed
When the sensor is off, low speed
When the airflow speed has no delay from the high to low switching, the speed should be delayed for 3
minutes (remain at high speed for 3 minutes.) before the next switch.
Manus: When the system is operating, you can set the high, medium or low speed manually. (When the
sensor is on or off, the system will change the speed 2 seconds after receiving the signal.)
*Airgate location control: the location for the airgate can be set according to your needs.
*Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling or dehumidifying).
When the compressor works continuously for 1/6 minutes (adaptable in EEPROM) and the temperature of
the indoor coils has been below zero centigrade for 10 seconds, the compressor will be stopped and the
malfunction will be recorded in the malfunction list. The indoor system will continue to run. When the
temperature of the indoor coil is raised to 46°F, the compressor will be restarted again (the requirement of 3
minutes’ delay should be satisfied.)
* timing system on/off function.
* Dormant control function.
14
73.4°F

Functions and Control
Domestic air conditioner
7.1.3 Dehumidifying mode.
* temperature control range: 60.8---86 F
* temperature difference:
30.2/33.8°F
Control feature: send the dehumidifying signal to the outdoor system.
When Tr>Ts+35.6°F , the compressor will be turned on, the indoor fan will operate at the set speed.
When Tr is between the Ts and Ts+35.6°F , the outdoor system will operate at the high dehumidifying
frequency for 10 minutes and then at the low dehumidifying mode for six minutes. The indoor fan will
operate at low speed.
When Tr< Ts, the outsystem will be stopped, the indoor fan will be stopped for 3 minutes and then turned to
the low speed option.
All the frequency converses have a 30.2/33.8°F difference.
* Wind speed control: Automatic:
When Tr Ts+41°F , high speed.
When Ts+37.4°F Tr< Ts+41°F , medium speed.
When Ts+35.6°F Tr< Ts+37.4°F, low speed.
When Tr<Ts+35.6°F, light speed.
If the outdoor fan stopped, the indoor fan will be paused for 3 minutes.
If the outdoor fan stopped for more than 3 minutes and the outdoor system still operates, the system will be
changed into light speed mode.
When the airflow speed has no delay from the high to low switching, the speed should be delayed for 3
minutes (remain at high speed for 3 minutes.) before the next switch.
Manual: When the sensor is off or Tr< Ts+37.4°F, the manual operation can not be made. (obligatory automatic
operation.)
*Airgate location control: the location for the airgate can be set according to your needs.
*Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling or dehumidifying).
When the compressor works continuously for 1/6 minutes (adaptable in EEPROM) and the temperature of
the indoor coils has been below zero centigrade for 10 seconds, the compressor will be stopped and the
malfunction will be recorded in the malfunction list. The indoor system will continue to run. When the
temperature of the indoor coil is raised to 44.6°F, the compressor will be restarted again (the requirement of 3
minutes’ delay should be satisfied.)
* Coil protection (synchronic overheating protection) are installed for the four directions latch malfunctions
when dehumidifying.
* Timing system on/off function.
* Dormant control functio
n.
7.1.4 Heating operation mode.
* temperature control range: 60.8---86 F
* temperature difference: 30.2/33.8°F
* control feature: the temperature compensation is automatically added and the system will send the heating
signals to the outdoor system.
If Tr Ts, the outdoor compressor is turned on, the indoor fan will be at the cold air proof mode.
If Tr>Ts+35.6°F, the outdoor system is turned off, the indoor fan will be at the heat residue sending mode.
If Tr<Ts+35.6°F, the outdoor system will be turned on again, the indoor fan will be at the cold air proof mode.
15
<
<

Functions and Control
Domestic air conditioner
*Indoor fan control
manual control: You can choose high, medium, low and automatic speed control.
Automatic: When Tr<Ts, high speed.
When Ts Tr Ts+35.6°F, medium speed.
When Tr> Ts+35.6°F, low speed.
When the airflow speed has no delay from the high to low switching, the speed should be delayed for 3
minutes (remain at high speed for 3 minutes.) before the next switch.
*Airgate location control: the location for the airgate can be set according to your needs.
Coldair proof operation
1. The indoor operation within 4 minutes after the start up is as the following diagram, the air speed can be
raised only after the speed has reached a certain level.
2. 4 minutes after the start up of the indoor fan, the light airflow and the low airflow will be turned to the set
speed airflow.
3. In the cold air proof operation, the fan won’t stop after the start up.
4. During the cold air proof operation, the indoor system will continuously send ‘indoor high speed’ signals to
the outdoor system.
* Residue heat sending. The indoor fan will send the residue heat at a low speed for 12 seconds.
If other conditions are satisfied, when the compressor stops, the indoor system will operate at a light speed.
The indoor fan will stop when the coil temperature is below the ‘heat start temp 4’.
* Defrosting. When the system receives the defrosting signal from outdoors, the indoor fan will stop and the
indoor temperature display won’t change. At the time, any indoor coil malfunctions will be neglected. When
the outdoor defrosting finishes, the coil malfunction will still be neglected until the compressor has been
started up for 30 seconds. The indoor temperature display will not change and the system operates at the
cold air proof mode.
* Automatic heating temperature compensation: when the system enters the heating mode, the temperature
compensation (4) will be added. When the status is switched off, the compensation will be erased.
7.1.5 Strength operation
The system enters the mode after receiving the ‘strength signal’.
Send strength operation signal to the outdoor system.
The mode change finishes the strength operation.
Entering ‘mute’, you can have normal operation or signal control such as timing to finish the strength
operation.
When the system is at the automatic option with the strength/ mute function, if the system enters the cooling
Heat start temp 1
Heat start temp 2
Heat start temp 3
Heat start temp 4
Set speed
Low speed
Light speed
Fan/off
Fan/off
Keep the hig
h
speed. The fa
n
doesn’t stop
16

 Functions and Control 
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Domestic air conditioner 
mode, the cooling strength/ mute function will be offered; if the system enters the heating mode, then the
heating strength/ mute function will be offered; if the system enters the airflow mode, there will be no
strength/ mute function.
7.1.6 Mute operation
The system enters the mode after receiving the ‘mute signal’.
a. Mute heating: the airflow speed is slight, the system sends the mute signal to the outdoor system.
b. mute cooling: the airflow speed is slight, the system sends the mute signal to the outdoor system.
When the compressor operates, the airflow speed is mute speed. EEPROM is adaptable.
Mute operation can not work under the dehumidifying and airflow-sending operation.
7.1.7 Air refreshing
After receiving the signal from the remote control, (HV series: the background light of the ‘health’ logo is
green. HS series: the ‘health’ indicator will be lighted). If the fan operates, the Nano-Aqua operates to realize
the ions sending function.
If the indoor fan stops, the Nano-Aqua is turned off.
When the Nano-Aqua is turned off, if the air refreshing system is turned on, the Nano-Aqua will be turned on
when the fan operates.
7.1.8 Timing
You can set 24 hours’ on/off timing accordingly. After the setting, the timing indicator will be lightened. Also,
the light will be turning off after the timing is finished. The followings are several timing methods.
1.system /on timing: The timing indicator will be lightened and the indoor system is under the waiting mode.
The light will be turned off when the timing is finished and the rest of the system will operate under a normal
condition. The timing starts since the last reception of the timing signal.
2.system /off timing: When the system is turned on, the timing indicator is lightened, the rest of the system
will operated under a normal condition. When set time comes, the indicator light will be turned off and the
system will be turned off. If you have set the dormant functions, the order of your settings will be operated
according to the timing settings.
3 .system /on and off timing: The settings will be completed according to the orders..
7.1.9 Dormant operation
The dormant timing is an eight hours unadaptable one. The timing signs are shown on the V series board.
(RC series show the dormant signal, the timing light is lighted on the 6 lights board).
2.1 Under the cooling/ dehumidifying operation, after the setting of the dormant operation, the set
temperature will be raised for 1 centigrade after 1 hour’s operation and will be raised for 1 centigrade 1 hour
later. The system will keep this status for 6 hours and then close.
2.2 Under the heating mode, after the setting of the dormant operation, the setting temperature will fall 2
centigrade after 1 hour’s operation and will fall 2 centigrade 1 hour later. 3 hours after the preceding
operations, the set temperature will be raised for 1 centigrade and the system will keep this status for 3 hours
and then close down.
2.3 During the dormant time, except the change of the system mode or a new press on the dormant setting
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Functions and Control
Domestic air conditioner
keys, the timing of the 8 hours dormancy will take the first timing as the start time, any presses on other keys
will not affect the original timing.
2.4 Indoor fan control under the dormant operation.
If the indoor fan is at the high speed before the dormant operation setting, the speed will be turned to medium
after the setting. If the fan is at the medium speed before the dormant setting, the speed will be turned to low
after the setting. If the fan is at the low speed before the dormant setting, the speed will not change.
7.1.10 Urgent on/off input
Press the urgency button the buzzer will ring. The system will enter the automatic mode if you don’t press the
button for more than 5 seconds.
Under the system off mode, if you press the urgency key for 5 to 10 seconds, the system will start the test
operation.
Under the system off mode, if you press the urgency key for 10 to 15 seconds, the display screen will show
the resume of the last malfunction.
If the system is under operation, the press on the urgency key will stop it.
Under the system off mode, the display screen will show automatic running sign.
Under the system off mode, the system will not receive the remote control signal if the press on the urgency
key doesn’t last for 15 seconds or if the key is loosened.
Urgency operation: If you press the urgency key for less than 5 seconds, the buzzer will ring when you press
the on/off key. The system will enter the urgency operation when the urgency key is loosened. The urgency
operation is fully automatic.
Test operation.
The inlet temperature sensor doesn’t work, the indoor fan and the indoor air direction board motor works
synchronically. High speed airflow, cooling, outdoor system on, etc, will send the ambient temperature 30
centigrade and coil temperature 16 centigrade information to the outdoor system.
Test operation
The defrost protection of the evaporator doesn’t work.
The temperature control doesn’t work.
The test operation will be finished in 30 minutes.
The test operation can be stopped by the relative commands from the remote control.
7.1.11 Low load protection control
In order to prevent the frosting of the indoor heat interaction device, the outdoor system will be stopped if the
indoor heat interaction temperature is below zero centigrade for 5 minutes, but the fan will continue to
operate. The outdoor system will be started again when the heat interaction temperature is above 7
centigrade and the system has been stopped for 3 minutes. The malfunction will be stored in the malfunction
resume and will not be revealed.
7.1.12 High load protection control
The outdoor system will be stopped if the coil temperature is above 149°F for 2 minutes. The indoor fan will be
controlled by the thermostat. The outdoor system can be restarted when the coil temperature is below 107.6°F
and the system has been stopped for 3 minutes. The malfunction will be stored in the malfunction resume
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