Check Valve (Outdoor Eev Check Valve); Check Valve (Oil Separator) - LG MULTI V 5 Manual Book

5. 4Way Valve
2.11 Reverse Valve
1. Keep it off before the outdoor unit is powered on and the indoor unit is turned on.
2. Cooling, defrosting, oil recovery : OFF, heating : ON
1. Keep it off before the outdoor unit is powered on and the indoor unit is turned on.
3. When alternating cooling to heating, transform 4 way valve during re-starting for 3 minutes.
2. Cooling, defrosting, oil recovery : OFF, heating : ON
3. When alternating cooling to heating, transform 4 way valve during re-starting for 3 minutes. 4. To check the mode of cooling/heating operation of 4 way valve, touch the piping surface of low pressure
4. To check the mode of cooling/heating operation of 4 way valve, touch the piping surface of low pressure service valve.
service valve.
5. Refrigerant flowchart of 4 way valve
5. Refrigerant flowchart of 4 way valve
Indoor Heat
Exchanger
Outdoor Heat
Exchanger
[Heating Operation] [Cooling Operation]
6. Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it
6. Insulation resistance in the state of connecting the valve to coil should be over 100mΩ when measure it with DC
mega tester(DC 500V).
with DC mega tester(DC 500V).
■ Checking Method (Flow Chart)
2.12 Temperature Sensor
1) outdoor temperature sensor : TH1
Checking start
2) Pipe temperature sensor : TH2
3) Discharge pipe(D-pipe) temperature sensor : TH3
1. Check the condition of installation and the contact of temperature sensor.
After 3 minutes
2. Check whether the connector contact of temperature sensor is normal.
3. Measure the resistance of temperature sensor. operating, the difference No
between the high and low
TH1 TH2
pressure is more than 4
atm? 10KΩ±1%(25℃) 5KΩ±1%(25℃)
Resistance
The compressor is
1.07KΩ±3.3%(85℃) 535KΩ±3.3%(85℃)
operating normally?
Yes
The connection of PCB
terminal is correct?
Voltage is applied
successfully on the PCB?
Restart (after operating the self-
- 69 -
Copyright ©2011 LG Electronics. Inc. All right reserved. recovery logic of 4 way valve in
Only for training and service purposes
case of series)
After 3 minutes
operating, the difference
between the high and low
pressure is more than 4
No malfunction of 4 way valve
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_TROUBLE SHOOTING GUIDE BOOK
Checking Method for Key Components
D : Discharge
Outdoor Heat
E : Evaporator
Exchanger
C : Condensor
S : Suction
TH3
200KΩ±1%(25℃)
No
Replace the compressor
28KΩ±7.7%(85℃)
Yes
No
Re-connection of PCB terminal
Yes
No
Replace the PCB
Yes
LGE Internal Use Only
No
Check the 4 way valve coil and
replace
atm?
Yes

6. Check Valve (Outdoor EEV Check Valve)

Checking start
There is a temperature
Yes
difference across the check
valve during the cooling
operation?
No
Replace the check valve
There is a temperature
difference between
No
front and rear of the outdoor
EEV during full heating
operation?
Yes
Outdoor EEV is correct?
No malfunction of check valve Replace the check valve

7. Check Valve (Oil Separator)

Checking start
In normal condition of
compressor discharging
Yes
temperature, there is the
temperature difference of
check valve?
No
No malfunction of check valve
No
No
Yes
Replace the outdoor EEV
Replace the check valve
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