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Mitsubishi Electric PURY-RP200 Service Handbook page 129

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[ VII Control ]
-5- 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
RP200 model
RP250 model
RP300 model
The maximum frequency during heating operation is affected by the outdoor air temperature to a certain extent.
(1) Pressure limit
The upper limit of high pressure (63HS1) and intermediate-pressure value (63HS2) is preset, and when it exceeds the upper
limit, the frequency is decreased every 15 seconds.
The operating pressures for the cooling and heating modes are shown below.
Cooling: High pressure (63HS1) is 3.70 MPa [536 psi], and intermediate pressure (63HS2) is 3.20 MPa [463 psi].
Heating: High pressure (63HS1) is 3.20 MPa [463 psi].
(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).
-6- Intermediate pressure control
Solenoid valve (SV6) and capillary tube (CP3) suppress the (intermediate) pressure at inlet to an existing pipe during Cooling-
only operation and perform the following functions.
Intermediate pressure control solenoid valve (SV6) (ON = Close)
Operation
While the unit is stopped
During Cooling-only mode
During operation in modes other than Col-
ing-only mode
During the defrost cycle
HWE10020
Frequency/cooling (Hz)
Max
Min
78
21
65
18
74
18
When high pressure (63HS1)
reaches 3.09 MPa or above
- 120 -
Frequency/heating (Hz)
Max
80
71
81
SV6
ON
Always OFF
When high pressure (63HS1) of
2.93 MPa or below has been con-
tinuously detected for 5 minutes
Always OFF
Always OFF
Min
29
15
15
OFF
GB
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