Johnson Controls YORK YH9FXC18BAH-FX User manual

SERVICE MANUAL
High Wall Fixed
R-410A 60Hz
YH9FXC18BAH--FX
Read this manual before installation and operation
Make sure that it is well kept for later reference

Domestic air conditioner
Contents
1.Introduction............................................................................................. 1
2.Features ................................................................................................. 6
3.Specifications ......................................................................................... 7
4.Sensors list............................................................................................. 8
5.Pinping diagrams.................................................................................... 9
6.Printed Circuit Board Connector Wiring Diagram..................................10
7.Functions and control ........................................................................... 13
8.System configuration............................................................................ 26
9.Dimensional drawings .......................................................................... 33
10.Center of gravity ................................................................................. 33
11.Service Diagnosis ............................................................................... 34
12. Circuit diagrams ................................................................................ 38
Contents

1 Domestic air conditioner
1.1 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.
1.1.1 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.
Introduction
1. Introduction

2Domestic 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.
1.1.2 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
Introduction

3Domestic air conditioner
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.
Introduction

4Domestic air conditioner
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.
1.1.3 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.
Introduction

5Domestic air conditioner
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.
1.1.4 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:
1.1.5 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.
Introduction

Features
6 Domestic air conditioner
2.Features
4 Fan setting :Select the fan speed LO,MED,HI,AUTO
Anti-mold filter: Catches most small particles and remove unpleasant odors effectively.
Sleep mode: The setting temperature and the indoor noise can be adjusted to a more comfortable level
when you set the “sleep mode” during night sleep.
24Hour timer: Use the timer function to set on,or off,or from on to off,or from off to on
Auto restart: Automatic return to previous operation conditions after sudden power blackout
Easy clean design: The panel is easy to wash and the airflow vents can be detached easily
Child lock: Avoid the child's wrong operation on the remote controller
3D air flow: The 3D airflow is able to deliver the airflow horizontally and vertically.
Auto mode: Adjust the last fixed operation mode automatically.
Power mode: Quick cooling or heating
Soft mode: Lower noise operation condition
Intelligent air: With twin-blade technology ,the airflow can be adjusted not to blow directly
RCD module: RCD module can strongly degrade formaldehyde that caused by the chemical products.
Super Nano-Quqa: Super Nano-Quqa can ionize water molecules into nanometer water ion, which can be easily
absorbed by skin.
Note: Y: Holding functions
N: No functions

Specifications
7 Domestic air conditioner
3.Specifications
NOMINAL DISTRIBUTION SYSTEM VOLTAGE
1/esahP
zHycneuqerF
VegatloV
NOMINAL CAPACITY and NOMINAL INPUT
cooling heating
Capacity rated
KW 5.27 /
Btu/h /
WK)detaR(noitpmusnoCrewoP 1.87 /
/
W/WPOCS/REES
01*0.2h/³mlavomeRerutsioM -³
TECHNICAL SPECIFICATIONS
mmD H*W * snoisnemiD
mmsnoisnemiDdegakcaP
GK/thgieW
GK/thgiewssorG
etihW//roloC
Sound level
Sound pressure(high/medium/low) dB 44/41/38
/
Bd)wol/muidem/hgih(rewopdnuoS
D H*W *
2.81
60
230
1085*329*430
997*230*322
12
15.5
18000

Sensors list
8Domestic air conditioner
TECHNICAL SPECIFICATIONS-PARTS
cooling heating
Fan
nafwolfssorCepyT
WtuptuorotoM
h/³m)hgih(etarwolfriA
Speed(super/high/low) rpm 1100/1000/900
Heat exchanger
Type ML fin- 7HI-HX tube
4.1*61*3hctif*egats*tnemgeS
hgiRlortnocnoitceridriA t,Left,Horizontal,Downward
Air filter Removable/Washable/Mildew Proof
Temperature control Microcomputer Control
AH-LYledomrellortnocetomeR
Note: the data are based on the conditions shown in the table below
htgnelgnipiPgnitaehgnilooc
Indoor: 32 DB/23 WB
Outdoor: 43 DB/26 WB / 5m
4.Sensors list
type Description Qty
1erutarepmetmoorgnitcetedrofdesus’tIrosnesmooR
Pipe sensor It’s used for detecting temperature of evaporator 1
Conversation formulae
Kcal/h= KW×860
Btu/h= KW×3414
cfm=m³/min×35.3
30
750

Piping diagrams
Domestic air conditioner
5 Pinping diagrams
9

Connector Wiring Diagram
10 Domestic air conditioner
6.Printed Circuit Board Connector Wiring Diagram
6.1 Indoor unit
Connectors Indoor PCB
series PCB connector Connect with load
1
2
3
4
5
6
7
8
CN1
CN17
CN23
CN501
CN6
CN7
CN48
CN9
connector for power line N.
connector for power line L.
connector for compressor control
connector for up and down step motor.
connector for ambient temp. sensor and piping temp.sensor.
connector for receiver display.
connector for Emergency switch.
connector for DC fan motor.

Connector Wiring Diagram
11 Domestic air conditioner
Connector wring diagram
CN17
CN7
CN48
CN6
CN501
CN23
CN9
CN1

Connector Wiring Diagram
12 Domestic air conditioner
Wiring Diagrams
INDOOR WIRING DIAGRAM
up-down stepmotor
K1
W
R
DC FAN MOTOR
M
CN23
FUSE1
CN501
left stepm otor
CN31
SW1
CN6 PIPING TEM P SENSOR
CN7
CN17
BR
BL Y/G
CN1
T3.15A/250VAC
CN9
AMBIENT TEM P SENSOR
ION GENERATOR
EMER GENCY SWITCH
RECEIVER DISP LAY
W(or BR)
B(or BL)
C0N1
C0N3
@
@
Y/G
34
1(L) 2(N)
WY/G R
B BR

Functions and control
13 Domestic air conditioner
7.Functions and control
7.1 Main functions and control specifications
Including brief introduction to air conditioners of series models and electric control function.
7.1.1 Automatic running
(1) Single cold automatic run mode:
First entering into this mode, the main control “MCU” determines the corresponding work pattern according to the
indoor temperature between cooling mode and blowing mode. When Tr Ts+3 , the unit enters the blowing mode,
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 Tr < Ts +3 , the unit enters the cooling mode and conducts the cooling programme, outlet air from
compressor is on and indoor fan motor run in fixed wind speed.
After entering into this mode,the main control “MCU” determines the corresponding work pattern according to the
indoor temperature between cooling mode and blowing mode. When in the cooling mode, if Tr Ts-3, the unit enters the
blowing mode. When in the blowing mode, if Tr >Ts-3,the unit enters the cooling mode .
(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 23 running cooling mode
b. Tr<23 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.
7.1.2 Indoor temperature control
Temperature control range : 16 ---30
Temperature control precision: 1
Compressor can’t be controlled by temperature sensor within 2 minutes after it starts
7.1.2.1 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.
7.1.2.2 Heating mode:
When Tr Ts, compressor, four-ways valve and outdoor fan motor is on, indoor fan
motor runs as in cold blast avoidance mode, and 4 of compensation is added after compressor is started.
When Tr>Ts+5 , compressor is off, and the indoor fan motor runs as in cold blast avoidance mode.
When Tr<Ts+5 , compressor, four-ways valve and outdoor fan motor is on, and the indoor fan motor runs as in the
mode of avoiding cold blast.
7.1.3 Cooling run mode:
temperature control range : 16 ---30

Functions and control
14 Domestic air conditioner
temperature control precision: 1
compressor can’t be controlled by temperature sensor within 2 minutes after it starts.
control character: when Tr Ts, outlet air from compressor is on and indoor fan motor run at fixed wind 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 1 )
auto: when Tr Ts+3 , the wind speed is high;
When Ts+1 Tr< Ts+3 , the wind speed is medium.
When Tr<Ts+1 , 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: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 72 ,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 65 , 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 refrigeration or dehumidifying mode), the compressor will be shut off when the temperature of the
indoor coil pipe is or below 0 and the compressor runs for over 5 minutes. When the temperature of the indoor coil
pipe ascends to over 7 , the compressor is restarted (must meet a 3-minutes delay)
Timer on, Timer off and sleep control are available.
7.1.4 Dehumidifying mode
Temperature control range : 16 ---30
Control character:
When Tr (indoor temperature) > Ts (temperature setting) +2 , compressor and outdoor fan motor run
continuously with indoor fan motor running in accordance with the wind speed setting(State 1).
When Ts Tr Ts +2 , 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 shut down of compressor(State 3).

Functions and control
15 Domestic air conditioner
When all the ranges alternate, there is ±1 difference.
7.1.5 Heating mode: (cooling only have no the mode)
*Temperature control range : 16 —30
*Temperature control precision: 1
*Control Character:
When Tr Ts, compressor, four-ways valve and outdoor fan motor is on, indoor fan motor runs as in cold blast
mode, and 4 of compensation is added after compressor is started.
When Tr Ts+5 , compressor is off, and the indoor fan motor runs as in warm blast mode.
When Tr Ts+5 , compressor, four-ways valve and outdoor fan motor is on, and the indoor fan motor runs as in
the mode of avoiding cold blast.
*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+2 , the wind speed is medium.
When Ts+2 Tr, the wind speed is low.
*Control of air door: setting the position of air door as required.
*Compressor control 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 running 10 seconds earlier
than compressor does. After compressor stops running, 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.
7.1.5.1 Cold draft prevention:
7.1.5.1.1 Compressor is interrupted during the defrosting operation and continues to run after defrosting is
completed. When the indoor exchanging temperature is below 23 , the indoor fan motor is off. When the indoor
exchanging temperature is above 23 , the indoor fan motor is running at weak speed.
7.1.5.1.2 If the temperature of coil pipe can’t be above 38 4 minutes later after start up, fan motor is running at
the preset wind speed.
7.1.5.1.3 If the temperature of coil pipe is above 38 4 minutes later after start up, fan motor is running at the
preset wind speed.
7.1.5.1.4 If coil pipe descends to the temp. lower than 38 from 38 . fan motor is running at the preset wind
speed.
*Warm blast: If the temperature sensor is off. Compressor stops running. If the temperature of coil pipe is above
Ts-1 Ts Ts+2 Ts+2
State3
State2
State1

Functions and control
16 Domestic air conditioner
23 , fan motor enter breeze mode; and if the temperature of coil pipe is below 20 , fan motor stops running.
7.1.5.2 High temperature protection and high temperature expiration protection:
7.1.5.2.1 High temperature prevention: When the temp. of coil pipe is above 56 , the outdoor fan motor stops.
When the temp descends to 52 , the outdoor fan motor is restarted and fan speed invertage frequence is more than
45 seconds.
7.1.5.2.2 High temperature expiration prevention: When the temp. of coil pipe is above 62 ,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 50 , the unit can be started again.
*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 -4 , compressor and air outlet stop, and air inlet runs according to the temp. setting. Compressor can be
restarted 3 minutes later.
7.1.5.3 Defrosting:
7.1.5.3.1 Entry conditions of defrosting:
The entry conditions of defrosting is classified into two types: intelligentized defrosting and sensor defrosting.
Through selecting and judging, the models without outdoor sensor defrosts according to intelligentized defrosting, and
others with sensor defrosts according to sensor defrosting.
Intelligentized defrosting:
7.1.5.3.1.1 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 38 .
7.1.5.3.1.2 Compressor runs20minutes continuously, and the temp. of indoor coil pipe decreases 1 per 6
minutes and this operation repeats 3 times, and the temp. of coil pipe is below 38 , and 5 minutes later after
compressor is restarted.
7.1.5.3.1.3 When compressor runs over 3 hours in total and over 20 minutes continuously and after the temp. of
indoor coil pipe is below 38 , the system enters defrosting mode.
7.1.5.3.1.4 The difference between the temp. of indoor coil pipe and the indoor temp. is below 16 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 38 , the system enters defrosting mode.
7.1.5.3.2 Exit conditions of defrosting:
Defrosting time is higher than 12 minutes (compressor is on).
7.1.5.3.2.1 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 seconds after compressor is started.
7.1.5.3.2.2 During the defrosting and 2 minutes After quiting the defrosting mode, abnormality of temp. sensor
isn’t detected.
7.1.5.3.2.3 After quiting the defrosting mode, the fan motor enter cooling prevention mode.

Functions and control
17 Domestic air conditioner
7.1.6 Timer function:
You can set 24-hour timer on or timer off as required, and the minimum time unit is 1 minute. After setting, the
indicator of indoor unit is on , and it is off when timer setting is completed. There are several timer mode as follows.
7.1.6.1 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.
7.1.6.2 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.
7.1.6.3 Timer on and timer off can be set synchronously.
7.1.7 Sleep function: the timer indicator lights up.
7.1.7.1 In cooling/defrosting mode, the temp. setting increases 1 one hour later after start up. After another
hour the temp. setting increase by more 1 and then run continuously for another 6 hours and then close.
7.1.7.2 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.
7.1.8 Emergency switch input:
7.1.8.1 Press the switch of emergency operation, then buzzer rings once and unit enters the automatic operation
mode. (emergency operation)
6hours
1 hour
1 hour
Ts Sleep OFF T(hour)
Ts+1
Ts+2
T( )

Functions and control
18 Domestic air conditioner
7.1.8.2 If the switch is kept pressed for 5 seconds, buzzer ring two times and unit enter enter test run mode.
7.1.8.3 Press the switch again, and then closes.
7.1.8.4 Enter emergency operation from timer mode, then timer is cancelled.
7.1.9 Test run:
7.1.9.1 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
7.1.9.2 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.
7.1.10 memory 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 “sleeping” button 10 times within 5 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.
7.1.11 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.
7.2 Value of Thermistor
7.2.1 Indoor unit
Room sensor
R25 =23K ±3.5%
B25 /50 =4200K±3%
Temp.( ) Max.(K ) Normal(K ) Min.(K ) Tolerance( )
-30 568.8372 501.0746 440.8435 -1.97 1.75
-29 530.9600 468.6491 413.1441 -1.95 1.74
-28 495.8488 438.5314 387.3645 -1.93 1.72
-27 463.2850 410.5433 363.3602 -1.91 1.71
-26 433.0683 384.5212 340.9980 -1.90 1.70
-25 405.0156 360.3153 320.1558 -1.88 1.69
-24 378.9588 337.7879 300.7211 -1.86 1.67
-23 354.7440 316.8126 282.5905 -1.84 1.66
-22 332.2300 297.2732 265.6686 -1.82 1.64
-21 311.2873 279.0627 249.8676 -1.80 1.63
-20 291.7969 262.0831 235.1067 -1.78 1.62