Silent Mode; Test Run - Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual

(m) Broken wire detection on temperature sensor
i) Outdoor unit heat exchanger temperature sensor and outdoor air temperature sensor
If the following is detected for 5 second continuously within 2 minutes to 2 minutes and 20 seconds after the
compressor ON, the compressor stops. After a delay of 3 minutes, it restarts but, if the same is detected repeatedly
3 times within 40 minutes, the compressor stops with the anomalous stop.
Note (1) During defrost operation and for 3 minutes after the end of defrost operation, it is not detected.
• Outdoor unit heat exchanger temperature sensor: -50°C or lower
• Outdoor air temperature sensor: -45°C or lower
ii) Discharge pipe temperature sensor and suction pipe temperature sensor
If the following is detected for 5 second continuously within 10 minutes to 10 minutes and 20 seconds after the
compressor ON, the compressor stops. After a delay of 3 minutes, it restarts but, if the same is detected repeatedly
3 times within 40 minutes, the compressor stops with the anomalous stop.
Note (1) During defrost operation and for 3 minutes after the end of defrost operation, it is not detected.
• Discharge pipe temperature sensor: -10°C or lower
• Suction pipe temperature sensor: -50°C or lower
(n) Fan motor error
i) If the fan speed of 100min
the operation command of fan tap at ➀ speed or higher), the compressor stops.
ii) When the fan motor speed drops to 100min
enters the anomalous stop mode with E48 displayed on the remote control.
(o) Anomalous stop by the compressor start stop
i) When it fails to shift to the compressor DC motor's rotor position defection operation at 5 seconds after
establishing the compressor start condition, the compressor stops temporarily and restarts 3 minutes later.
ii) If it fails to shift to the position detection operation again at second time, it judges the anomalous compressor start
and stops the compressor by the anomalous stop (E59).

(7) Silent mode

(a) As "Silent mode start" signal is received from the remote control, it operates by dropping the outdoor unit fan tap and
the compressor speed (frequency).
(b) For details, refer to items (1) and (4) above.

(8) Test run

(a) It is possible to operate from the outdoor unit using the DIP switch on the outdoor unit control PCB.
ON
SW3-3
OFF
Make sure to turn SW3-3 to OFF after the end of operation.
(b) Test run control
i) Operation is performed at the maximum compressor speed (frequency), which is determined for each model.
ii) Each protective control and error detection control are effective.
iii) If SW3-4 is switched during test run, the compressor is stoped for once by the stop control and the cooling/heating
operation is switched.
iv) Setting and display of remote control during test run
Mode
Cooling test run
Heating test run
-1 or under is detected for 30 second continuously under the outdoor unit fan control (with
OFF
SW3-4
ON
Normal and end of test run
Item
Contents of remote control setting/display
Setting temperature of cooling is 5°C.
Setting temperature of heating (preparation) is 30°C.
-
-1
or under 5 times within 60 minutes and the compressor stops, it
Cooling test run
Heating test run
332
-
'19 • PAC-T-327