LG S4-S5-SE Chassis, Service Manual

Page: 36 / 44

Additional gas charging
(Gas leakage)
ï When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal operating suc-
tion pressure.
ï 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 10 15 20 25 30 35 40
50∞ C
40∞ C
30∞ C
20∞ C
10∞ C
0∞ C
P = 3 + 0.0123 x T
out
1.5
+ 0.8 x T
in
0.5
Where, P : Suction Pressure(kg/cm
2
.g)
Tout : Outdoor Temperature(∞ C)
Tin : Indoor Temperature(∞ C)
Operating Suction Pressure (For R4 10 A)
(According to Indoor & Outdoor Temperature)
-36-