LG AS-H0764DM0 Service Manual page 54

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.
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54 Room Air Conditioner
Operating Suction Pressure (For R401A)
(According to Indoor & Outdoor Temperature)
10 15
P = 3 + 0.0123 x T
Where, P : Suction Pressure(kg/cm
Tout : Outdoor Temperature(˚C)
Tin : Indoor Temperature(˚C)
(At operating the Unit for 10 minutes)
20 25
Indoor Temp. (˚C)
1.5
+ 0.8 x T
out
2
. g)
50˚C
40˚C
30˚C
20˚C
10˚C
0˚C
30 35 40
0.5
in