Hitachi Utopia PAS-3HVRG, Service Manual

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4-1
FIELD WORK INSTRUCTION
4. FIELD WORK INSTRUCTION
4.1 Overheating in Case of Using PC-5H
Question and Answer for Field Work
Example 1: Overheating in Case of Using PC-5H
[Phenomenon]
After test run, indoor temperature increases more than 30
o
C even if the setting temperature is 20
o
C.
[Cause]
Test running is performed from the outdoor unit, the operation mode at the test running is
memorized.
[Countermeasure]
In such case, perform the self checking and initialize the memory by following procedure.
1. Depress “
Λ
”, “
V
”, “High” and “Medium” simultaneously.
2. 7-segment and LED will be lit.
3. Depress all the touch type switches one by one.
4. 7-segment indicates “
Ou
”.
5. Transmission check will be performed.
6. After 3 seconds, 7-segment indicates “
77
” (for Main Unit) or “
88
” (for Sub Unit) or “
EE
” (Abnormal).
7. After 3 seconds, voltage check will be performed.
8. After 3 seconds, 7-segment indicates “
AA
” (Normal) or “
EE
” (Abnormal).
9. After 3 seconds, automatically indicates “
5
”, “
4
”, “
3
”, ..... (Count Down).
10. Depress “
Λ
” before “
0
” is appeared.
11. If the temperature setting become 25 deg. and all the LEDs are turned OFF, initial condition is set.
RUN/STOP
HIGH MEDIUM LOW