LG Electronics LAN091CNP, LAU091CNP, LAN121CNP Air Conditioner User Manual


 
Service Manual 61
Troubleshooting Guide
Additional gas charging
(Gas leakage)
When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal operating suc-
tion pressure.
Use the graph or the equation below to get operating suction pressure according to indoor and outdoor tem-
perature.
Suction pressure was measured at 3-way valve service port after operating the unit for 10 minutes.
The method of using graph
- Find outdoor temperature.
- Find indoor temperature onto the curve of outdoor temperature.
- Read suction pressure at the axis of ordinates.
The method of using equation
-. Calculate suction pressure after putting indoor and outdoor temperature into the equation.
13
(At operating the Unit for 10 minutes)
Suction Pressure
(Kg/cm
2
.g)
Outdoor Temp.
(˚C)
Indoor Temp. (˚C)
12
11
10
9
8
7
6
5
5 10152025303540
50˚C
40˚C
30˚C
20˚C
10˚C
0˚C
P = 3 + 0.0123 x Tout
1.5
+ 0.8 x Tin
0.5
Where, P : Suction Pressure(kg/cm
2
.
g)
Tout : Outdoor Temperature(˚C)
Tin : Indoor Temperature(˚C)
Operating Suction Pressure (For R410A)
(According to Indoor & Outdoor Temperature)