Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 36

(6) Protective control/anomalous stop control by compressor's number of revolutions
(a) Compressor discharge pipe temperature protection
(i) Discharge pipe temperature control (Solenoid valve SV1 control(At heating mode))
The solenoid valve SV1 opens to suppress the rise of discharge pipe temperature.
1) SV1 open condition
In case the following conditions and other certain conditions are satisfied.
• Discharge pipe temperature (detected with Tho-D) is 100°C or higher.
• Low pressure is 0.7MPa or lower.
2) SV1 close condition
In case any of the following conditions are satisfied.
• Discharge pipe temperature (detected with Tho-D) is less than 50°C.
• Low pressure is more than 0.8MPa.
(ii) 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.
［Cooling］
Release
100
Discharge pipe temperature (°C)
［Heating］
Pattern I
3.8
〈Parttern I〉
Release
100
Discharge pipe temperature (°C)
(iii) Anomalous stop control
1) If the discharge pipe temperature (detected with Tho-D) exceeds the setting value, the compressor stops.
2) When it is detected 2 times within 60 minutes or after continuous 30 minutes, including the stop of compressor,
E36 is displayed on the remote control and it enters the anomalous stop mode.
Compressor operation
Discharge pipe temperature (°C)
(iv) Reset of anomalous stop mode
As it drops to the reset value of 90°C or lower for 45 minutes continuously, it becomes possible to restart from the
remote control.
Reduces compressor
speed at each minute.
Retention
110
Pattern II
4
Pressure ratio
Reduces compressor
speed at each minute.
Retention
110
Compressor stop
90 135
-
〈Pattern II〉
Release
Discharge pipe temperature (°C)
35
-
'21 • PAC-SM-383
Reduces compressor
speed at each minute.
Retention
97 107