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Mitsubishi Electric PURY-WP200 Service Manual page 107

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[ VII Control ]
(5) Bypass solenoid valve (SV5c) (ON = Open)
Operation
While the unit is stopped
Cooling mode
Defrost mode
Others
Compressor Frequency Control
-4- Compressor Frequency Control
Depending on the capacity required, the frequency of the compressor is controlled to keep constant evaporation temperature
(0°C [32°F] = 0.71 MPa [103 psi]) during cooling operation, and condensing temperature (49°C [120°F] = 2.88 MPa [418 psi])
during heating operation.
The table below summarizes the operating frequency ranges of the inverter compressor during normal operation.
Model
WP200 model
WP250 model
The maximum frequency during heating operation depends on the outside air temperature and the dipswitch settings.
(1) Pressure limit
The upper limit of high pressure (63HS1) is preset, and when it exceeds the upper limit, the frequency is decreased every 15
seconds.
The actuation pressure is when the high-pressure reading on 63HS1 is 3.58MPa[519psi].
(2) Discharge temperature limit
Discharge temperature (TH4) of the compressor in operation is monitored, and when it exceeds the upper limit, the frequency
is decreased every minute.
Operating temperature is 115°C [239°F].
(3) Periodic frequency control
Frequency control other than the ones performed at start-up, upon status change, and for protection is called periodic frequen-
cy control (convergent control) and is performed in the following manner.
Periodic control cycle
Periodic control is performed after the following time has passed
30 seconds after either compressor start-up or the completion of defrost operation
30 seconds after frequency control based on discharge temperature or pressure limit
The amount of frequency change
The amount of frequency change is controlled to approximate the target value based on the evaporation temperature (Te) and
condensing temperature (Tc).
HWE1113B
ON
When one or more of the following
valves is turned OFF: SV4a
through SV4c.
Frequency/cooling
Max
Min
52Hz
18Hz
65Hz
18Hz
- 98 -
SV5c
OFF
Always ON
When the condition on the left is not
met
Always OFF
Always OFF
Frequency/heating
Max
Min
67Hz
15Hz
93Hz
15Hz
GB
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