Current Cut; Outdoor Unit Failure; Discharge Pipe Sensor Disconnection Protection Control; Regulation Of Outdoor Air Flow - Mitsubishi Heavy Industries SCM50ZS-S1 Technical Manual

(12) Current cut

(a) Purpose
(b) Detail of operation

(13) Outdoor unit failure

compressor
(23) Indoor fan motor protection

(14) Discharge pipe sensor disconnection protection control

(a) When the compressor speed is other than 0 rps.
(i) Tho-D(10)-Tho-D(0) < 8 °C, and Tho-D(10)-Tho-A(10) < 5 °C
The compressor speed is set on A rps for 5 minutes. After 5 minutes, the compressor speed is set on B rps for 5 minutes.
(ii) Tho-D(20)-Tho-D(15) < 5 °C
The compressor speed is set on 0 rps.
Notes (1) Tho-D(X): After compressor operation, the discharge pipe temperature sensor after X minutes.
(2) Tho-A(X): After compressor operation, the outdoor air temperature sensor after X minutes.
(b) Once the unit is stopped by this function, it is not restarted.
• Values of A, B
Model
A
B

(15) Regulation of outdoor air flow

(a) The fan operates as follows according to the compressor speed. (Except during defrost operation.)
NModel SCM50
Compressor speed (rps)
Outdoor fan speed
NModel SCM60
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.

(16) Serial signal transmission error protection

(a) Purpose
(b) Detail of operation
(i)
(ii)

(17) Rotor lock

(18) Outdoor fan motor protection
(19) Outdoor fan control at low outdoor temperature
(a)
Cooling
(i) Operating conditions
SCM50 SCM60
30 rps 20 rps
60 rps 60 rps
Cooling
More than 30
Less than 30
but 48 or less
4th speed 5th speed
Cooling
Less than 48 48 or more
5th speed 6th speed
min
-1
191
-
Heating
More than 30
48 or more Less than 30
but 61 or less
6th speed 4th speed 5th speed
Heating
Less than 61 61 or more
5th speed 6th speed
-
'18 • SCM-T-251
-
300
61 or more
6th speed
(SRF:150)