Outdoor Unit Failure - Mitsubishi Heavy Industries SRK20ZJX-S Service Manual

Model
Lower limit speed
2)
2) Control value
(12) Current safe
(a) Purpose:
Model
(b) Detail of operation:
SCM 40, 45, 50ZJ - S
SCM 60ZJ - S
SCM 71, 80ZJ - S
(13) Current cut
(a) Purpose:
(b) Detail of operation:

(14) Outdoor unit failure

compressor command
(15) Indoor fan motor protection (Refer to the FDTC series by 23 page)
(16) Discharge pipe sensor disconnection protection control
(a) When the compressor command speed is other than 0 rps.
1) Th3(10)-Th3(0) < 8 °C, and Th3(10)-Th2(10) < 5 °C
The compressor command speed is set on A rps for 5 minutes. After 5 minutes, the compressor command speed is set
on B rps for 5 minutes.
2) Th3(20)-Th3(15) < 5 °C :
The compressor command speed is set on 0 rps.
(b) Once the unit is stopped by this function, it is not restarted.
Notes (1) Th3(X): After compressor operation, the discharge pipe sensor temperature after X minutes.
(2) Th2(X): After compressor operation, the outdoor air sensor temperature after X minutes.
• Values of A, B
Model
A
B
(17) Regulation of outdoor air flow
(a) The fan operates as follows according to the compressor command speed. (Except during defrost.)
SCM40~60ZJ-S
Compressor speed (rps)
Outdoor fan speed
SCM71, 80 ZJ-S
Compressor speed (rps)
Outdoor fan speed
(b) If the outdoor unit's fan speed drops, the outdoor fan is run for 1 minute at that speed.
Cooling
40 ~ 50 32 rps
60 ~ 80
25 rps
115
Current safe
Cooling Heating
10.0 12.0
11.0 14.0
13.0 16.0
SCM40ZJ-S SCM45ZJ-S
30 rps 30 rps
60 rps 60 rps
Cooling
Model 40: Less than 40
Model 45: Less than 40
Model 50: Less than 48
Model 60: Less than 48
5th speed
Cooling
More than 31 More than 46
Less than 31
but 46 or less but 66 or less
3rd speed 4th speed 5th speed
Heating
32 rps
32 rps
Current safe
Cooling Heating
10.0 10.0
10.0 10.0
10.0 10.0
SCM50ZJ-S SCM60ZJ-S
30 rps 20 rps
60 rps 60 rps
Model 40: 40 or more Model 40: Less than 56
Model 45: 40 or more Model 45: Less than 56
Model 50: 48 or more Model 50: Less than 61
Model 60: 48or more Model 60: Less than 61
6th speed
66 or more Less than 31
38
- -
6th speed 3rd speed
'10 • SCM-SM-094
Unit: A
Current safe
Cooling Heating
7.5 7.5
7.5 7.5
7.5 7.5
SCM71ZJ-S SCM80ZJ-S
20 rps 20 rps
60 rps 60 rps
Heating
Model 40: 56 or more
Model 45: 56 or more
Model 50: 61 or more
Model 60: 61 or more
6th speed
5th speed
Heating
More than 31 More than 66
but 66 or less but 85 or less
4th speed 5th speed
300 (SRF:150)
85 or more
6th speed