Cooper&Hunter CH-PT09HSGF Service Manual

Cooper&Hunter CH-PT09HSGF Service Manual
SERVICE MANUAL
PACKAGED TERMINAL
AIR CONDITIONER
WITH HEAT PUMP
Model: CH-PT09HPGF
F or proper operation, please read and keep this manual carefully.
Designed by Cooper&Hunter International Corporation, Oregon, USA
www.cooperandhunter.com
CONTENTS
1. Precaution
P1-4
1.1 Safety Precaution
P1
1.2 Warning
P1-4
2. Functions and control panel.
P5-7
3. Dimension
P8
4. Refrigerant Cycle Diagram
P9
5. Electronic function
P10-16
5.1 Terms and definitions
P10
5.2 Electric Control working environment
P10
5.3 Protection function
P10
5.4 Operation of fan motor
P10-12
5.5 Operation of compressor
P12
5.6 Dip switches and Jumper selection
P13-14
5.7 Functions for Front desk switch panel and Wire Controller
P15
6. Unit components
P16
7. Installation details
P17-20
7.1 How to install the unit
P17-19
7.2 Care and cleaning
P19-20
8 Operation characteristics
P21
8.1 Cooling operation
P21
8.2 Heating operation
P21
9 Power connection options
P21
10 Troubleshooting
P22-23
P24-29
1. Precaution
1.1 Safety Precaution.
● To prevent injury to the user or other people and property damage, the following instructions must be
followed.
Incorrect operation due to ignoring instruction will cause harm or damage.
Before service unit, be sure to read this service manual at first.
1.2 Warning
INSTALLATION
● Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit.
There is risk of fire or electric shock.
● For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized service center.
Do not disassemble or repair the product, there is risk of fire or electric shock.
● Always ground the product.
There is risk of fire or electric shock.
● Install the panel and the cover of control box securely.
There is risk of fire of electric shock.
● Always install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric shock.
● Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
● Do not modify or extend the power cab
There is risk of fire or electric shock.
● Do not install, remove, or reinstall the unit by yourself(customer).
There is risk of fire, electric shock, explosion, or injury.
● Be caution when unpacking and installing the product.
Sharp edges could cause injury, be especially careful of the case edges and the fins on the condenser and
evaporator.
● For installation, always contact the dealer or an Authorized service center.
There is risk of fire, electric shock, explosion, or injury.
1
● Do not install the product on a defective installation stand.
It may cause injury, accident, or damage to the product.
● Be sure the installation area does not deteriorate with age.
If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal
injury.
● Do not let the air conditioner run for a long time when the humidity is very high and a door
or a window is left open.
Moisture may condense and wet or damage furniture.
● Take care to ensure that power cable could not be pulled out or damaged during operation.
There is risk of fire or electric shock.
● Do not place anything on the power cable.
There is risk of fire or electric shock.
● Do not plug or unplug the power supply plug during operation.
There is risk of fire or electric shock.
● Do not touch (operation) the product with wet hands.
There is risk of fire or electric shock.
● Do not place a heater or other appliance near the power cable.
There is risk of fire and electric shock.
● Do not allow water to run into electric parts.
It may cause fire, failure of the product, or electric shock.
● Do not store or use flammable gas or combustible near the product.
There is risk of fire or failure of product.
● Do not use the product in a tightlyclosed space for a long time.
Oxygen deficiency could occur.
● When flammable gas leaks, turn off the gas and open a window for ventilation before turn
the product on.
Do not use the telephone or turn switches on or off. There is risk of explosion or fire.
● If strange sounds, or small or smoke comes from product. Turn the breaker off or
disconnect the power supply cable.
There is risk of electric shock or fire.
● Stop operation and close the window in storm or hurricane. If possible, remove the product
from the window before the hurricane arrives.
There is risk of property damage, failure of product, or electric shock.
2
● Do not open the inlet grill of the product during operation.
(Do not touch the electrostatic filter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.
● When the product is soaked (flooded or submerged), contact an Authorized service center.
There is risk of fire or electric shock.
● Be caution that water could not enter the product.
There is risk of fire, electric shock, or product damage.
● Ventilate the product from time to time when operating it together with a stove, etc.
There is risk of fire or electric shock.
● Turn the main power off when cleaning or maintaining the product.
There is risk of electric shock.
● When the product is not be used for a long time, disconnect the power supply plug or turn
off the breaker.
There is risk of product damage or failure, or unintended operation.
● Take care to ensure that nobody could step on or fall onto the outdoor unit.
This could result in personal injury and product damage.
CAUTION
● Always check for gas (refrigerant) leakage after installation or repair of product.
Low refrigerant levels may cause failure of product.
● Install the drain hose to ensure that water is drained away properly.
A bad connection may cause water leakage.
● Keep level even when installing the product.
To avoid vibration of water leakage.
● Do not install the product where thenoise or hot air from the outdoor unit could damage
the neighborhoods.
It may cause a problem for your neighbors.
● Use two or more people to lift and transport the product.
Avoid personal injury.
● Do not install the product where it will be exposed to sea wind (salt spray) directly.
It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause
product malfunction or inefficient operation.
3
OPERATIONAL
● Do not expose the skin directly to cool air for long periods of time.
(Do not sit in the draft).
This could harm to your health.
● Do not use the product for special purposes, such as preserving foods, works of art, etc. It
is a consumer air conditioner, not a precision refrigerant system
There is risk of damage or loss of property.
● Do not block the inlet or outlet of air flow.
It may cause product failure.
● Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
There is risk of fire, electric shock, or damage to the plastic parts of the product.
● Do not touch the metal parts of the product when removing the air filter. They are very
sharp.
There is risk of personal injury.
● Always insert the filter securely. Clean the filter every two weeks or more often if
necessary.
A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.
● Do not insert hands or other object through air inlet or outlet while the product is operated.
There are sharp and moving parts that could cause personal injury.
● Do not drink the water drained from the product.
It is not sanitary could cause serious healthissues.
● Use a firm stool or ladder when cleaning or maintaining the product.
Be careful and avoid personal injury.
● Replace the all batteries in the remote control with new ones of the same type. Do not mix
old and new batteries or different types of batteries.
There is risk of fire or explosion.
● Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
They may burn of explode.
● If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water.
Do not use the remote of the batteries have leaked.
The chemical in batteries could cause burns or other health hazards.
4
2. Functions and control panel.
The controls featured in this manual are representative of many available models. Your model
may offer slightly different features.
·POWER
- Press the POWER button to turn the unit on or off.
When the unit is on,the power indicator light will be green.When the unit is off,the light will go out.
·MODE
- Push this button to cycle through the modes from COOL-HEAT-FAN-COOL.The green indicator light beside the "MODE"
option will illuminate, identifying the mode selected.
- COOL:The range of set temperature is 17℃/62℉~30℃/86℉.Cooling begins automatically when the room temperature is
above the set point,and stops when the room temperature is 2℃ (4℉) below the set point.But the compressor will run 5
minutes at least in COOL mode before stoping. The fan runs in continuous mode.
- HEAT:The range of set temperature is 17℃/62℉ ~29℃/84℉.For heat pump models,the unit can alternate to run between in
reverse cycle heat mode and electric heater mode according to the difference between the setting temperature and the room
temperature.The fan motor cycles on and off with the compressor and electric heater.
NOTE: The reverse cycle and electric heater can not be run at the same time. In following cases, it is normal that the reverse
cycle does not operate.
1.When the outdoor temperatrue is lower than 4℃/40℉ or the room temperature falls to 4.5℃/8℉ below the set point
temperature.
2.There is a 3-minute minimum compressor run time at any setting to prevent short cycling. The indoor fan motors starts before
the compressor and stops after the compressor cycles off.
3.When frost builds up to the evaporator coils, the unit will defrost automatically and the compressor will cycle off.
- FAN:Fan operation only without heating and cooling.
5
UP/DOWN BUTTONS ( ▲ / ▼ )
- Push the UP (or DOWN) button to increase (or decrease) the set temperature of the unit in cooling
or heating mode.The temperature can be set by increments of 1℃ (1℉).The setting temperature
appears in the display.
NOTE:Press and hold ▲ and ▼ buttons together for 3 seconds will alternate the temperature display between ℃
&℉ scale.
FAN (FAN SPEED)
- Every time you push this button, the fan speed cycles through the settings as follows: HIGH-MED- LOW-HIGH.
DISPLAYS:
- Shows the set temperature in ℃ or ℉. While on Fan only mode, it shows the room temperature.
Control code:
LC-Pads on the control panel is not available. The unit can be set by using wire controller only.
Note: When receiving the wired remote control signal display LC. Or when wired remote control signal is not
received within the panel key operation for 5 seconds to display LC
FC- Front desk control
Turn the switch to off
You can connect the front desk
switch for two ways.
6
Error codes:
AS- Open or short circuit of room temperature sensor (T1);
ES- Open or short circuit of evaporator temperature sensor( T2 );
CS-Open or short circuit of condenser temperature sensor (T3);
oS-Open or short circuit of outside temperature sensor(T4);
HS- Open or short circuit of exhaust temperature sensor( T5 or T6);
Other codes:
LO-Room temperature is lower than 0℃/32℉;
HI-Room temperature is higher than 37℃/99℉
E4- Communication malfunction between main control board and display board
LE- Drive-by-wire controller failure
7
3. Dimension
Top View
D
W
H
Front View
Dimension :
WxHxD(mm)
WxHxD(inch)
Dimension 1
(no sleeve,rear grille,and rear net)
1067x406x532
Dimension 2
(no rear grille and rear net, but include sleeve)
1067x408x578
Dimension 3
(include sleeve and rear net)
1067x408x588
Dimension 4
(include sleeve, rear net and rear grille)
1067x408x606
42.0x15.9x20.9
42.0x16.0x22.8
42.0x16.0x23.1
42.0x16.0x23.9
8
4. Refrigerant Cycle Diagram
The figure below is a brief description of the important components and their function in what is called the
refrigeration system.
This will help to understand the refrigeration cycle and the flow of the refrigerant in the Heat Pump Cycle.
LIQUID SIDE
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
GAS SIDE
REVERSING VALVE
(Heating Model only)
ACCUMULATOR
COOLING
COMPRESSOR
HEATING
9
5. Electronic function
5.1 Terms and definitions
T1: Temperature of indoor ambient
T2: Temperature of evaporator
T3: Temperature of condenser
T4: Temperature of outdoor ambient
TS: The set temperature.
DAHT: Temperature of discharge (T5)
DAHT: Temperature of discharge (T6)
5.2 Electric Control working environment
Input voltage: 265V, 60Hz; 230/208V, 60Hz
5.3 Protection function
5.3.1 The compressor functions protection with a delay of three minutes.
5.3.2 Sensor protection at open or short circuit.
5.3.3 Evaporator anti-freezing protection at cooling mode.
5.4 Operation of fan motor
5.4.1. Fan motor is on when compressor is on, Fan motor is off when compressor is off. (except theT2 high
Temp. protection).
If there’s only one speed of the fan motor, use the high speed instead of the low speed.
5.4.2. The fan motor operates at the cooling only mode (see FIG.A)
T4 Operate on high speed
T01
T02
Operate on low speed
FIG.A
10
When T4>T01 and lasts for 1 minute, the fan motor will operates at high speed.
When T4<T02 and lasts for 1 minute, the fan motor will operates at low speed.
When T02≤T4≤T01:
A) If fan motor is off originally, it will operate at high speed.
B) If fan motor is on originally, it will keep on working at the original speed.
5.4.3. The fan motor operates at the heat pump and cooling mode( see FIG.B)
T4 Operate on low speed
T03
T04
Operate on high speed
FIG.B
When T4≥T03 and lasts for 1 minute, the fan motor will operates at low speed.
When T4≤T04 and lasts for 1 minute, the fan motor will operates at high speed.
When T04<T4<T03:
A) If fan motor is off originally, it will operate at high speed.
B) If fan motor is on originally, it will keep on working at the original speed.
5.4.4. The high temperature protection of evaporator at the heat pump and cooling mode as
below:
11
If T2>TE7, this unit turns into the protection of compressor off , and quits this protection when T2≤TE9.
If T2>TE8,it turns into the protection of fan motor off , and quits this protection when T2≤TE9.
If T2>TE15, fan motor operates at low speed by force, then quits the operation and determines the
high or low speed by T4.
5.4.5. At the fan only mode, the fan always keeps on working, and the compressor/fan
motor/heater stop working.
5.5 Operation of compressor
5.5.1. The compressor operates at cooling mode as below:
Operation condition
Compressor on
(T1-Ts)℉
+0
-4
Compressor off
T1≥Ts
compressor on
T1≤Ts-4℉
. compressor off
5.5.2. The compressor operates at heating mode:
(There are two ways of heating mode: Heat pump and cooling/Electric heater and cooling)
The electrical heater or compressor will be activated by sensing the difference between setting
temperature and the actual ambient room temperature.
Operation condition for
heater or compressor
(T1-Ts)℉
Heater(compressor) off
2
-2
Heater(compressor) on
12
5.5.2.1 The Electric heater operates as below:
a.When T1<Ts-2℉, the fan motor operates, and 3 seconds later, the heater is on and operates at low speed
within 30 seconds. After 30 seconds, it will change to the setting speed. If the DAHT temperature checked is
higher than the protection temperature, when the heater operating, the fan motor will be off automatically.
b. When T1≥Ts+2℉, the heater is off, and the fan motor keeps on working at setting speed. If the DAHT temperature
checked is low than the protection temperature, and the operation time of fan motor is more than 15 seconds, then
the fan motor will be off. If the T2 protection gets started, the fan motor also does not work.
5.5.2.2 The Heat pump operates as below:
The Heat pump′s operation mode is in accordance with the way of compressor′s working. The compressor is on (electric heater
is off), the fan motor operates according to the anti-cold wind of heat pump. The four-way valve always keeps on. When T1<Ts-2
℉, the compressor is on, and when T1≥Ts+2℉,it will be off. The fan motor works according to the operation of compressor. If
T2>TE7, the compressor is off by force. When the DAHT protection gets started, it is not allowed that the compressor operates.
5.6
Dip switches and Jumper selection
Note: This Switch board is optional.
Dip Switches configurations and functions of each dip switch
position.
(See Figure and Table 1 as below)
13
Table 1
DIP SWITCHES CONFIGURATIONS
No.
UP(ON)
DOWN(OFF)
Remarks
S1
Electric Heat Only
Electric Heat and Pump Heat
For Heat Pump unit only
S2
Temperature Display in℃
Temperature Display in ℉
S3
Wall Thermostat Enable
UP*UP:61℉~86℉(16℃~30℃);
UP*DOWN:65℉~78℉(18℃~26℃);
DOWN*UP:63℉~80℉(17℃~27℃);
DOWN*DOWN:68℉~75℉(20℃~24℃);
Control Panel Enable
S6
Fan Continuous Run for Heating
Fan Cycle for Heating
S7
Fan Continuous Run for Cooling
Fan Cycle for Cooling
S8
Low temp. Protection enable
Use some types of wall
Thermostat
Low temp. Protection disable
Use PTAC other Wall
Thermostat
S4*S5
S9
Two configurations (S4*S5)
combine to select set point
range.
You can consult with the
sales agency or manufacturer
for details
NOTE: On heating mode, the setting temperature can’t be higher than 29℃/84℉.
* Electric Heat Only (for heat pump unit only)
- This setting is typically used for Emergency Heating.
* Wall Thermostat Enable
- A wired wall thermostat can be connected to the unit .If it is, this dip switch must be moved to the
Wall Thermostat Enable Position, before the wall thermostat will begin control.
* Set-point Temperature Limits
- Provides a restricted range of temperature control.
.Heat and Cool Fan CON/CYC Dip-switches
- Allows the fan to operate in continuous or cycle modes while the unit is in heating and cooling mode.
* Continuous (CON)
- Allows fan to run continuously, circulating air even when the temperature setting has been satisfied. This
switch helps to maintain the room temperature closer to the thermostat setting.
* Cycle (CYC)
- This setting allows the fan to cycle on and off with the compressor or electric heater. The fan stops a short
time after the temperature setting is satisfied.
14
5.7 Functions for Front desk switch panel and Wire Controller.
1.Front desk switch panel: if a ON/OFF switch is connected to the ports, you can turn off A/C unit with it.
Then the digital LED on the unit will display FC.
(The FIG.A shows you how to connect the units)
2. Wired controller: the digital LED will display LC (Reserved) if a wired controller is connected.
if the communication portal is one way, the buttons on the control panel will be invalid.
Note: This wired controller is optional, and it’s matched with the switch board.
FRONT DESK SWITCH PANEL
ROOM 100
ROOM 101
ROOM N
FIELD-SUPPLIED
24V
TRANSFORMER
(SEE NOTE1)
Black
PTAC #1
White
Black
PTAC #2
White
Black
White
PTAC #N
15
SUGGESTIONS:
1. TO Size transformer, use the following equation:
Quantity of PTAC units x 1va=Transformer Size (va)
Example: 110 PTAC units x1va=110va Transformer
2. Following are American Wire Gauge recommended sizes:
AWG WIRE SIZE NO.
MAX. LENGTH (ft)
24
400
22
600
20
900
18
1500
16
2000
6. Unit components
Decomposition figure
16
wall
Installation figure
7. Installation details
7.1 How to install the unit
iINSTALLATION
!
CAUTION
There are sharp edges that can cause serious cuts.
When lifting the air conditioner, it is HEAVY. Use 2 people to lift.
17
Dimension of air conditioner
- For existing sleeve, you should measure the wall
sleeve dimensions.
- Install the new air conditioner according to these
installation instructions to achieve the best performance.
All wall sleeves used to mount the new air conditioner
must be in good structural condition and have a rear
grille that securely attaches to the sleeve or the flange
of the sleeve to secure the new air conditioner.
- To avoid vibration and noise, make sure the unit is
installed securely and firmly.
- When installing the sleeve, make certain there is
nothing within 20 of the back that would interfere
with heat radiation and exhaust air flow. (See Fig.2)
●
PREPARATION OF SLEEVE ASSEMBLY(optional)
- Refer to the installation instruction of sleeve assembly
for details.
● UNIT INSTALLATION
- Carefully remove shipping tapes from the front panel.
(See Fig.3)
- Remove the front panel. (See Fig.4)
- Remove the shipping screw from the vent door.
(See Fig.5)
●
UNIT INSTALLATION (CONTINUED)
- Rotate the vent control lever to either open or close the vent
door. (See Fig.6)
w
18
- Lift unit level and slide unit into wall sleeve until
firmly against front of wall sleeve and secure with
4 screws and washers (supplied in the SLEEVE
ASSEMBLY) through the unit flange holes.
(See Fig.7 and Fig.8)
- Reinstall front panel.(See Fig.9)
Place tabs over top rail A . Push Inward at bottom
until panel snaps into place B.
7.2 Care and cleaning
• FRONT PANEL AND CASE
- Turn unit off and disconnect power supply. To
clean, use water and a mild detergent. Do not use
bleach and abrasivers. Some commercial cleaners
may damage the plastic parts.
• OUTDOOR COIL
- Coil on outdoor side of unit should be checked
regularly. Unit will need to be removed to inspect
dirt build-up that will occur on the inside of the coil.
If clogged with dirt and soot ,coil should be
professionally cleaned. Clean inside and outside of
outdoor coils regularly.
NOTE: Never use a high-pressure spray on coil.
19
!
CAUTION
VENT DOOR FILTER
IMPORTANT:TURN UNIT OFF BEFORE
UNIT DAMAGE HAZARD
CLEANING.
Failure to follow this caution may result in
- If the vent door is open, access requires the removal of
equipment damge or improper operation.
the unit from the wall sleeve. Clean the vent filter twice a
Airflow restriction may cause damage to the unit.
year or as required.
- Make sure to remove the shipping screw from the vent
- The most important thing you can do to maintain
door.(See.Fig.5)
unit efficiency is to clean the filters once every
- Rotate the vent control lever to open the vent door.
two weeks as required.
(See. Fig.6)
Clogged filters reduce cooling, heating and airflow.
- Remove four screws from the vent door filter.
(See.Fig.12)
!
CAUTION
- First pull out the vent door steel wire from the hole of
the vent door, then take off the vent door and filter.
UNIT DAMAGE HAZARD
(See.Fig.12)
Failure to follow this caution may result in equipment
- Clean the filter. Dry thoroughly before placing.
damage or improper operation.
- Replace the vent door and filter, reinstall the four
·Do not operate unit without filters in place. If a filter
screws.
becomes torn or damaged, it should be replaced
- Reinsert the vent door steel wire into the hole of the
immediately.
vent door.
·Operating without filters in place or with damaged
filter will allow dirt and dust to reach indoor coil and
Vent door
control lever
reduce cooling ,heating, airflow and efficiency of unit.
Airflow restriction may cause damage to unit.
Screws
Vent door
steel wire
- The most important thing you can do to maintain
unit efficiency is to clean the filters once every
Vent door
filter
two weeks as required.
Fig.12
Vent door
Clogged filters reduce cooling, heating and airflow.
- Keeping filters clean will:
Decrease cost of operation.
- To Clean Air Filters:
Save energy.
Vacuum off heavy soil.
Prevent clogged indoor coil.
Run water through filter.
Reduce risk of premature component failure.
Dry thoroughly before replacing.
20
8. Operation characteristics
8.1 Cooling operation
45
Dry
Outdoor air temp.℃ DB
40
Cooling
35
30
25
20
5
10
15
20
25
30
35
40
Indoor air temp.℃ DB
8.2 Heating operation
35
Indoor air temp.℃ DB
30
25
20
15
-5
5
15
25
Outdoor air temp.℃
DB
21
9. Power connection options
Appropriate power cord accessory kit is determined by the voltage, and amperage of the branch circuit. The
unit does not come with a power cord (or hard wire kit). An accessory power cord must be ordered to
connect the unit to the outlet. If the unit is to be hard wired, an accessory hard wire kit must be ordered.
IMPORTANT:
For 265V units, if a power cord is selected, it must plug into the 265V subbase accessory.
Cord-connected Units
The 240V field supplied outlet must match the plug for the standard 208/230V units and be within reach of
the service cord. The standard cord-connected 265V units require an accessory electrical subbase for
operation.
Power Cord Protection
The power cord for230/208v units provide power cord fire protection. Unit power automatically disconnects
when unsafe conditions are detected. Power to the unit can be restored by pressing the reset button on
plug head. Upon completion of unit installation for 230/208V models, an operational check should be
performed using the TEST/RESET buttons on the plug head.
NOTE:
The 265V models do not incorporate this feature as they require use of the electrical subbase
accessory. Our sub base accessory is being developed
THE APPEARANCE OF POWER PLUG IS DIFFERNENT BECAUSE OF DIFFERENT SUPPLIER
22
10.Troubleshooting
10.1 Error Display
Contents
Codes
AS
Open or short circuit of T1 temperature sensor
ES
Open or short circuit of T2 temperature sensor
CS
Open or short circuit of T3 temperature sensor
oS
Open or short circuit of T4 temperature sensor
HS
Open or short circuit of T5 or T6 temperature sensor
Lo
Temperature is lower than display range(0℃/32℉)
HI
Temperature is higher than display range(37℃/99℉)
E4
Communication malfunction between main control board and display board.
LE
Drive-by-wire control failure
23
10.2 Troubleshooting
10.2.1 Open circuit or short circuit of temperature sensor diagnosis and solution(AS/E5/CS/oS/HS)
Error Code
AS/E5/CS/oS/HS
Malfunction decision
conditions
If the sampling voltage is lower than 0.06V or higher than 4.94V, the
LED will display the failure.
Supposed causes
●
●
●
Wiring mistake
Faulty sensor
Faulty PCB
Troubleshooting:
Check the connection
between temperature
sensor and PCB.
No
Correct the connection
No
Repalce the sensor
Yes
Measure the resistance
value of the sensor
Yes
Replace indoor main PCB
T5/T6
T4 T3
T2
T1
24
10.2.2 Communication malfunction between main control board and display board. (E4)
Error Code
E4
Malfunction decision
conditions
Main control board does not receive feedback from display board
during 120 seconds.
Supposed causes
●
●
●
Wiring mistake
Faulty display board
Faulty main control board
Troubleshooting:
Communication malfunction between main
control board and display board
Check the signal wire between the
Display board and the main board,
is it connected good?
No
Yes
Reconnect and retry. Is error
still display?
No
Yes
Replace display board, Is error
still display?
No
Yes
Replace the main control
board
Trouble is solved
25
10.2.3 Drive-by-wire controller failure. (LE)
Error Code
LE
Malfunction decision
conditions
1, Electric heating signal or compressor signal is on, but fan signal is
off
2, Electric heating signal and compressor signal are on, but 4-way
valve signal is off
3, Cooling only models have heating signal, or the 4-way valve signal
and compressor signal are on at the same time.
●
Wiring mistake
●
Faulty wire controller
●
Wire controller doesn’t match
Supposed causes
Troubleshooting:
Drive-by-wire controller failure
Electric heating and
compressor are on, but 4-way
valve is off
Electric heating or compressor
is on, but fan is off
No
Yes
Yes
Check whether the wiring
between controller and dip
switch board is correct
Yes
No
Cooling only models have
heating signal, or the 4-way
valve and compressor signal
are on at the same time.
No
reconnection
Wire controller doesn’t
match, change the wire
controller
DIP SWITCH TERMINAL
FC(L)
FC(N)
LOW-FAN
HI-FAN
4-WAY
HEAT2
HEAT1
COMP
24V(N)
24V(L)
Yes
Check whether the wiring
between controller and dip
switch board is correct
No
Yes
reconnection
Wire controller is set wrong
4-way valve is set wrong
DESIGNATION
Front desk control terminal L
Front desk control terminal N
Low fan speed
High fan speed
4-way valve(for heat pump model)
Electrical heater 2
Electrical heater 1
Compressor
24VAC terminal N COM
24VAC terminal L
24V CONTROLLER
GL
GH
B
W
(W)
Y
C
R
26
POSSIBLE CAUSES
UNIT DOES NOT START
Unit may have become unplugged
Fuse may have blown
Circuit breaker may have been tripped
Unit may be off
Unit may be in a protection mode.
UNIT NOT COOLING/HEATING ROOM
Unit air discharge section is blocked
Temperature setting is not high or low
enough
Note: Setpoint limits may not allow the
unit to heat or cool the room to the
temperature desired. Check section on
dipswitch settings.
Unit air filters are dirty.
Room is excessively hot or cold when
unit is started.
Vent door left open.
Unit may be in a protection mode.
Compressor is in time delay.
DISPLAY HAS STRANGE NUMBERS/
CHARACTERS ON IT
SOLUTONS
Check that plug is plugged securely in wall receptacle.
Note:Plug has a test/reset button on it. Make sure that the plug has
not tripped.
Replace the fuse. See Note 1.
Reset circuit breaker. See Note 1.
Turn unit on (bottom right button on keypad).
Make sure that curtains, blinds or furniture are not restricting or
blocking unit airflow.
Reset to a lower or higher temperature setting.
Remove and clean filters.
Allow sufficient amount of time for unit to heat or cool the room. Start
heating or cooling early before outdoor temperature, cooking heat or
gatherings of people make room uncomfortable.
Close vent door.
Check dipswitch settings for desired comfort.
Wait approximately 3 minutes for compressor to start.
The unit may be in a protection mode.
The unit may be set for ℃(instead of ℉).
UNIT MAKING NOISES
Clicking, gurging and whooshing noises are normal during operation
of unit.
WATER DRIPPING OUTSIDE
If a drain kit has not been installed, condensation runoff during very
hot and humid weather is normal. See Note 2.If a drain kit has been
installed and is connected to a drain system, check gaskets and
fittings around drain for leaks and plugs.
WATER DRIPPING INSIDE
Wall sleeve is not installed level
Wall sleeve must be installed level for proper drainage of
condensation .Check that installation is level and make any
necessary adjustments.
ICE OR FROST FORMS ON INDOOR
COIL
Low outdoor temperature
Dirty filters
When outdoor temperature is approximately 55℉ or below, frost
may form on the indoor coil when unit is in Cooling mode. Switch unit
to FAN operation until ice or frost melts.
Remove and clean filters.
COMPRESSOR PROTECTION
Power may have cycled, so compressor
is in a restart protection.
Random Compressor restart-Whenever the unit is plugged in,or
power has been restarted,a random compressor restart will occur.
After a power outage, the compressor will restart after approximately
3 minutes.
Compressor Protection-To prevent short cycling of the compressor,
there is a random startup delay of 3 minutes and a minimum
compressor run time of 3 minutes.
NOTES:
1.If circuit breaker is tripped or fuse is blown more than once, contact a qualified electrician.
2.If unit is installed where condensation drainage could drip in an undesirable location, an accessory drain kit
should be installed and connected to drain system.
27
Characteristic of temperature sensor
Temp.℃/℉
Resistance
KΩ
Temp.℃/℉
Resistance
KΩ
Temp.℃/℉
Resistance
KΩ
-10/14
62.2756
17/62
14.6181
44/111
4.3874
-9 /15.8
58.7079
18/64
13.918
45/113
4.2126
-8 /17.6
56.3694
19/66
13.2631
46/115
4.0459
-7 /19.4
52.2438
20/68
12.6431
47/117
3.8867
-6 /21.2
49.3161
21/70
12.0561
48/118
3.7348
-5 /23
46.5725
22/72
11.5
49/120
3.5896
-4 /24.8
44
23/73
10.9731
50/122
3.451
-3 / 26.6
41.5878
24/75
10.4736
51/124
3.3185
-2 / 28.4
39.8239
25/77
10
52/126
3.1918
-1 /30.2
37.1988
26/79
9.5507
53/127
3.0707
0 /32
35.2024
27/81
9.1245
54/129
2.959
1 /33.8
33.3269
28/82
8.7198
55/131
2.8442
2 /35.6
31.5635
29/84
8.3357
56/133
2.7382
3 /37.4
29.9058
30/86
7.9708
57/135
2.6368
4 /39.2
28.3459
31/88
7.6241
58/136
2.5397
5 /41
26.8778
32/90
7.2946
59/138
2.4468
6 /42.8
25.4954
33/91
6.9814
60/140
2.3577
7 /44.6
24.1932
34/93
6.6835
6.6835
61/142
2.2725
8 /46.4
22.5662
35/95
6.4002
6.4002
62/144
2.1907
9 /48.2
21.8094
36/97
6.1306
6.1306
63/145
2.1124
10 /50
20.7184
37/99
5.8736
5.8736
64/147
2.0373
11 /51.8
19.6891
38/100
5.6296
5.6296
65/149
1.9653
12 /53.6
18.7177
39/102
5.3969
5.3969
66/151
1.8963
13 /55.4
17.8005
40/104
5.1752
5.1752
67/153
1.830
14 /57.2
16.9341
41/106
4.9639
4.9639
68/154
1.7665
15 /59
16.1156
42/108
4.7625
4.7625
69/156
1.7055
16 /60.8
15.3418
43/109
4.5705
4.5705
70/158
1.6469
28
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