LG LRSC21934SW, Service Manual

Page: 46 / 129

1-10. Temperature compensation and over-cool/weak-cool compensation circuit
1. Temperature compensation at freezing room, cold storage room
1) GR-P247, L247, P207, L207
2) GR-C247, B247, C207, B207
u Temperature compensation table by adjustment value (difference value against current temperature)
Ex) If changing compensation resistance at a cold storage room (RCR1) from 10 k
Ω
(current resistance) to 18 k
Ω
(modified resistance), temperature at the cold storage will increase by +1°C.
Ex) Now (R)J1= , (R)J2=1.2k
Ω
, RCRI=5.6k
Ω
want to compensate -2°C for Freezing room temperature and
+2°C for Cold storage room temperature
(R)J1 = 12k
Ω
1k
Ω
(R)J2 = 12k
Ω
RCRI = 5.6k
Ω
18k
Ω
EXPLATION FOR MICOM CIRCUIT
- 46 -
(R)J1
(R)J2
Freezing room Cold storage room
Resistance value
Temperature Resistance value Temperature Remarks
(R)J1 (R)J2
compensation (RCR1) compensation
+5 °C 180 k
Ω
+2.5 °C Warmly
+4 °C 56 k
Ω
+2.0 °C compensate
+3 °C 33 k
Ω
+1.5 °C
+2 °C 18 k
Ω
+1.0 °C
+1 °C 12 k
Ω
+0.5 °C
0 °C 10 k
Ω
0 °C Reference temperature
-1 °C 8.2 k
Ω
-0.5 °C
-2 °C 5.6 k
Ω
-1.0 °C
-3 °C 3.3 k
Ω
-1.5 °C
-4 °C 2 k
Ω
-2.0 °C Coolly
-5 °C 470
Ω
-2.5 °C compensate
6.2 k
Ω
5.1 k
Ω
3 k
Ω
2.4 k
Ω
1.2 k
Ω
1 k
Ω
1.8 k
Ω
2.7 k
Ω
3.9 k
Ω
5.1 k
Ω
: JUMP WIRE