LG LAN121CNM Service Manual - Page 48

Additional gas charging

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Troubleshooting Guide Additional gas charging (Gas leakage) • When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal oper- ating suction pressure. • Use the graph or the equation below to get operating suction pressure according to indoor and out- door temperature. 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. Suction Pressure (Kg/cm2.g) Outdoor Temp. (˚C) Operating Suction Pressure (For R410A) (According to Indoor & Outdoor Temperature) (At operating the Unit for 10 minutes) 13 12 50˚C 11 40˚C 10 30˚C 9 20˚C 8 10˚C 0˚C 7 6 5 5 10 15 20 25 30 35 40 Indoor Temp. (˚C) P = 3 + 0.0123 x Tout1.5 + 0.8 x Tin0.5 Where, P : Suction Pressure(kg/cm2.g) Tout : Outdoor Temperature(˚C) Tin : Indoor Temperature(˚C) 48 Room Air Conditioner

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48
Room Air Conditioner
Troubleshooting Guide
Additional gas charging
(Gas leakage)
•
When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal oper-
ating suction pressure.
•
Use the graph or the equation below to get operating suction pressure according to indoor and out-
door temperature.
Suction pressure was measured at 3-way valve service port after operating the unit for 10 minutes.
T
h
e
m
e
t
h
o
d
o
f
u
s
i
n
g
g
r
a
p
h
- Find outdoor temperature.
- Find indoor temperature onto the curve of outdoor temperature.
- Read suction pressure at the axis of ordinates.
T
h
e
m
e
t
h
o
d
o
f
u
s
i
n
g
e
q
u
a
t
i
o
n
-. 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)
O
p
e
r
a
t
i
n
g
S
u
c
t
i
o
n
P
r
e
s
s
u
r
e
(
F
o
r
R
4
1
0
A
)
(According to Indoor & Outdoor Temperature)