Protective Control/Anomalous Stop Control By Compressor S Number Of Revolutions - Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual

(c) Switching of defrost operation with SW3-1
i) If SW3-1 on the outdoor unit control PCB is turned to ON, it becomes easier to enter the defrost operation. Use
this when installing a unit at snowing regions.
ii) Control contents
a) It allows entering the defrost operation under the defrost condition A when the cumulative heating operation
time becomes 30 minutes. It is 37 minutes at SW3-1 OFF (Factory default).
b) It allows entering the defrost operation under the defrost condition B when the cumulative heating operation
time becomes 25 minutes. It is 30 minutes at SW3-1 OFF (Factory default).
c) It allows the defrost operation with the outdoor unit heat exchanger temperature (Tho-R).
(6) Protective control/anomalous stop control by compressor's number of revolutions
(a) Compressor discharge pipe temperature protection
i) Protective control
As the discharge pipe temperature (detected with Tho-D) exceeds the setting value, the compressor speed
(frequency) is controlled to suppress the rise of discharge pipe temperature.
ii) Anomalous stop control
a) If the discharge pipe temperature (detected with Tho-D) exceeds the setting value, the compressor stops.
b) When it is detected 2 times within 60 minutes or after continuous 60 minutes, including the stop of
compressor, E36 is displayed on the remote control and it enters the anomalous stop mode.
iii) Reset of anomalous stop mode
As it drops to the reset value of 85°C or lower for 45 minutes continuously, it becomes possible to restart from the
remote control.
(b) Cooling high pressure protection
i) Protective control
a) When the outdoor air temperature (Tho-A) is 40°C or higher and the outdoor unit heat exchanger temperature (Tho-R)
exceeds the setting value, the compressor speed (frequency) is controlled to suppress the rise of high pressure.
b) Control value A is updated to an optimum value automatically according to the operating conditions.
Reset
Outdoor unit heat exchanger temperature (°C)
ii) Anomalous stop control
a) As the outdoor unit heat exchanger temperature (Tho-R) exceeds the setting value, the compressor stops.
b) If it is detected 5 times within 60 minutes or 65°C or higher continues for 60 minutes, including the stop of
compressor, E35 is displayed on the remote control and it enters the anomalous stop mode.
Compressor operation
iii) Reset of anomalous stop mode
As it reaches the reset value of 51°C or lower, it becomes possible to restart from the remote control.
Retention
Release
100
Discharge pipe temperature (°C)
Compressor operation
85
Discharge pipe temperature (°C)
Reduces compressor
speed at each minute.
A
Compressor stop
51 65
Outdoor unit heat exchanger temperature (°C)
-
Reduces compressor
speed at each minute.
105
Compressor stop
115
329
-
'19 • PAC-T-327
Control value A
54-60°C