Inching Prevention - Mitsubishi Heavy Industries SRK20ZJX-S Service Manual

(b) Detail of operation
The crankcase heater operates, warming up the compressor, then refrigerant begins circulating smoothly when the cooler
starts its heating operation, and heating begins.
(c) Restoration conditions
When the temperature detected by the outdoor air temperature (Th2) reaches 12°C or higher, or the operation mode chang-
es from stop to cooling or heating.

(10) Inching prevention

When the compressor becomes to the thermo operation within 5 minutes since operation start or becomes dehumidifying opera-
tion, the operation is continued with the compressor command speed of minimum rps forcibly.
(11) Compressor overheat protection
(a) Purpose:
(b) Detail of operation
1)
(Example) Fuzzy
Model
Lower limit speed
2)
(12) Current safe
(a) Purpose:
(b) Detail of operation:
(c) Current safe control value: Set this using the jumper wire (J1 or J2) on the outdoor PCB. Control starts
(13) Current cut
when it exceeds the control value.
(a) Purpose:
(b) Detail of operation:
1) Switching with jumper wire
(14) Outdoor unit failure
Jumper wire (J1)
compressor command
(15) Indoor fan motor protection (Refer to the FDTC series by 23 page)
95
Discharge pipe temperature (˚C)
95 105
95 105
Item
Cooling
40 ~ 50 32 rps
60 ~ 80
25 rps
115
Short-circuit (At shipping from factory)
Open
h
3 minutes
3 minutes
3 minutes
105
105 115
Heating
32 rps
32 rps
Jumper wire (J2)
Short-circuit
Short-circuit
(At shipping from factory)
Current safe Current safe
Current safe Current safe
37
- -
'10 • SCM-SM-094
'09•SRK-DB-087D
115
3 minutes
3 minutes
(SRF:150)
300