23
7
SERVICE FUNCTIONS
7-1. COMPULSORY DEFROSTING MODE FOR SERVICE
By short circuit of the connector JP607 and R853 on the outdoor deicer P.C. board, defrosting mode can be accomplished
regardless of the defrost interval restriction.
Defrost thermistor RT61 must read below 0°C.
7-2. CHANGE IN DEFROST SETTING
<JPC> when the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed.
<JPE> when the JPE wire of the deicer P.C. board is soldered, the defrost temperature will be changed.
Jumper wire
JPC
JPE
Change point
Defrost interval time changes from 40 minutes to 15 minutes
Deforst start temperature changes from 0
:
to -3
:
Deforst finish temperature changes from 10.1
:
to 3.1
:
.
8
TROUBLESHOOTING
Compressor
Part name
Check method and criterion
Measure the resistance between the terminals with a tester.
(Coil wiring temperature –10°C ~ 40°C)
Figure
P INNER PROTECTOR
8-1. Instruction of troubleshooting
1. Trouble criterion of main parts
P
~
BLK
R
MAIN
AUX
RED
S
C
WHT
MUH-C07SV -
MUH-C09SV -
MUH-C12SV -
MUH-C18SV -
E1
E1
E1
E1
MSC-C07SV -
MSC-C09SV -
MSC-C12SV -
MSH-C18SV -
E1
E1
E1
E1
Normal
MUH-C07SV
3.71~4.55
Ω
5.23~6.40
Ω
2.91~3.58
Ω
1.99~2.44
Ω
3.59~4.39
Ω
C-R
C-S
Abnormal
Opened or
short-circuited
5.30~6.49
Ω
MUH-C09SV MUH-C12SV
MUH-C07SV -
MUH-C09SV -
MUH-C12SV -
MUH-C18SV -
E1
E1
E1
E1
MSC-C07SV -
MSC-C09SV -
MSC-C12SV -
MSH-C18SV -
E1
E1
E1
E1
0.93~1.15
Ω
1.79~2.19
Ω
MUH-C18SV
OB250-1qxp 3/3/00 2:09 PM Page 23