Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 37

(b) Cooling high pressure protection
(i) Protective control 1 (Compressor speed control)
1) Outdoor heat exchanger temperature (Tho-R) exceeds the control value A.
Value A is changed from 59°C to 53°C by number of 63H1 operations.
2) When the outdoor air temperature (Tho-A) is 40°C or higher.
3) If outdoor heat exchanger temperature (Tho-R) is less than the control value A continuously for 6minutes,
protective control finishes.
(ii) High pressure control 1 (Electric expantion valve EEVC control 1)
The electric expantion valve EEVC opens to suppress the rise of high pressure.
1) Operation condition
In case the following conditions are all satisfied.
• Outdoor heat exchanger temperature | Tho-R1 - Tho-R2 | is 8°C or higher (In case outdoor temperature is more
than 42°C), 10°C or higher (In case outdoor temperature is 42°C or lower).
• Outdoor heat exchanger temperature (either Tho-R1 or Tho-R2, whichever is higher) is 54°C or higher.
• Under-dome temperature - suction saturation temperature (SST) is 30°C or higher.
2) Ending condition
In case any of the following conditions are satisfied.
• Outdoor heat exchanger temperature | Tho-R1 - Tho-R2 | is 4°C or lower (In case outdoor temperature is more
than 42°C), 6°C or lower (In case outdoor temperature is 42°C or lower).
• Outdoor heat exchanger temperature (either Tho-R1 or Tho-R2, whichever is higher) is 50°C or lower.
• Under-dome temperature - suction saturation temperature (SST) is 8°C or lower (In case outdoor temperature is
more than 42°C), 10°C or lower (In case outdoor temperature is 42°C or lower).
(iii) High pressure control 2 (Electric expantion valve EEVC control 2)
The electric expantion valve EEVC opens 30 pulse every 60 seconds to suppress the rise of high pressure.
1) Operation condition
In case the following conditions are all satisfied.
• Outdoor heat exchanger temperature (either Tho-R1 or Tho-R2, whichever is higher) is 58°C or higher.
• Under-dome temperature - suction saturation temperature (SST) is 15°C or higher.
• Outdoor temperature is 46°C or higher.
2) Ending condition
In case any of the following conditions are satisfied.
• Outdoor heat exchanger temperature (either Tho-R1 or Tho-R2, whichever is higher) is 50°C or lower.
• Under-dome temperature - suction saturation temperature (SST) is 8°C or lower.
• Outdoor temperature is 43°C or lower.
(iv) Anomalous stop control
1) As the outdoor heat exchanger temperature (Tho-R) exceeds the setting value, the compressor stops.
2) If it is detected 5 times within 60 minutes or 64°C or higher continues for 30 minutes, including the stop of
compressor, E35 is displayed on the remote control and it enters the anomalous stop mode.
(v) Reset of anomalous stop mode
As it reaches the reset value of 50°C or lower, it becomes possible to restart from the remote control.
Reduces compressor
speed at each minute.
Reset
A
Outdoor heat exchanger temperature (°C)
Compressor operation
50
Outdoor heat exchanger temperature (°C)
36
-
Control value A
59-53°C
Compressor stop
64
-
'21 • PAC-SM-383