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57
1
Release tabs of the control box cover and detach the control box cover .
Release the fixing screws of the control box. (Fig. 6)
Removal Procedure For Electronic Controller
Fig 6
2. Release the lead wire CN-FM, CN-FB, CN-AIR, CN-STM,CN-RCV ,
CN-DISP and earth wire(Yellow/Green). Pull out the whole electronic
controller.
Fig 7
Removal Procedure For the Discharge Grille
1. Separate the drain hose and the drain plate(Fig. 8)
Fig 8
2. Pull out the discharge grille slightly (Fig. 9)
Fig. 9
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
Removal Procedure For Cross Flow Fan
Remote control reset
If the display is chaotic or can not be adjusted,
Remove the back lid of the remote control
and you will find the resetting terminals and
shorten the two terminals using a screw driver
to reset.
Resetting terminals
Fig 14
58
1. Release the two fixing screws on the left side of the evaporator
and lift up the evaporator slightly. (Fig. 10)
2.Loose the fixing screw of the cross flow fan. (Fig. 11)
Fig. 10
Fig. 11
Fixing Screw
3.After removing the bearing (refer to fig12) , indoor fan can be
taken out from the left side.
Bearing
4. Lift up the indoor fan slightly, and then pull the fan motor out.
Fig13
Fig 13
Fan motor
Fig 12
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
59
In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of compressor or fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table to the right.
Normal pressure and outlet air temperature(standard)
Cooling mode
Gas side pressure
Mpa
(kg/cm G)
2
0.4~0.6(4~6)
12~16
Outlet air
temperature
(
)
Condition: indoor fan speed: high
outdoor temperature:
35
35
(Cooling mode)
7
(Heating mode)
Difference in the
intake and outlet
air temperature
More than 8
(15 minutes afte an
operation is started) at the cooling mode
Normal
Measuring electric current
during operation
during operation
Measuring gas side
pressure
pressure
Less than 14
at the heating mode.
Value of electric
current
during operation
Higher than
specified
Dusty heat exchanger
preventing heat radiation
Excessive amount
of refrigerant
Lower than specified
Gas side pressure
Cooling
mode
mode
High
Low
Low
Inefficient compressor
Insufficient refrigerant
clogged strainer or
capillary tube
capillary tube
12.1. Refrigeration cycle system
12 Troubleshooting Guide
Measuring the air
temperature difference
temperature difference
Heating mode
1.5~2.1(15~21)
36~45
More than 14
(15 minutes afte an
operation is started)
at the heating mode
Less than 8
at the cooling mode.
CS-PA7DKD / CU-PA7DKD / CS-PC7DKD / CU-PC7DKD
Inefficient compressor
Insufficient refrigerant
clogged strainer or
capillary tube
capillary tube
Low
Low
Heating
mode
mode
Low
60
Condition of the air
conditioner
Insufficient refrigerant
(gas leakage)
Clogged capillary
tube
Short circuit in the
indoor unit
Heat radiation deficiency
of the outdoor unit
Insufficient
compression
Cooling mode
Low pressure
High pressure
Electric current
during operation
12.2.
Relationship between the condition of air conditioner and pressrue
and electric current
and electric current
12.3. Diagnosis methods of a malfunction of a compressor .
Nature of fault
Insufficient compressing
of a compressor
Locked compressor
Symptom
Electric current during operation becomes approximately 80% lower
than the normal level.
The discharge tube of the compressor becomes abnormally hot
(normally 70~90
than the normal level.
The discharge tube of the compressor becomes abnormally hot
(normally 70~90
).
The difference between high pressure and low pressure becomes
almost zero.
almost zero.
Electric current reaches a high level abnormally, and the value exceeds
the limit of an ammeter. In some cases, a breaker turns off.
The compressor has a humming sound.
the limit of an ammeter. In some cases, a breaker turns off.
The compressor has a humming sound.
Inefficient switches of
the 4-way valves
Electric current during operation becomes approximately 20% lower than
the normal valve.
The temperature difference between from the discharge tube to the 4-way
valve and from suction tube to the 4-way valve becomes almost zero.
the normal valve.
The temperature difference between from the discharge tube to the 4-way
valve and from suction tube to the 4-way valve becomes almost zero.
Low pressure
High pressure
Electric current
during operation
Heating mode
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