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Model
Frequency/cooling
Frequency/heating
Speed
P200 type
30~81Hz
30~92Hz
3Hz/sec.
P250 type
20~69Hz
20~85Hz
3Hz/sec.
P300 type
20~83Hz
20~98Hz
3Hz/sec.
P350 type
20~99Hz
20~106Hz
3Hz/sec.
P400 type
20~100Hz
20~103Hz
3Hz/sec.
P450 type (50/60Hz)
20~70/56Hz
20~83/73Hz
3Hz/sec.
P500 type (50/60Hz)
20~85/73Hz
20~92/84Hz
3Hz/sec.
P550 type (50/60Hz)
20~96/88Hz
20~99/93Hz
3Hz/sec.
P600 type (50/60Hz)
20~104/98Hz
20~109/105Hz
3Hz/sec.
P650 type (50/60Hz)
✻
The maximum frequency during heating operation is affected by the outdoor air
temperature to a certain extent.
20~112/107Hz
20~120/113Hz
3Hz/sec.
4. Frequency control
• Depending on the capacity required, the frequency of the compressor is controlled to keep constant the evap-
oration temperature (0˚C = 0.71MPa) during cooling operation and condensing temperature (49˚C = 2.88MPa)
during heating operation.
• The capacity of the P200-P400 is controlled solely by the inverter-driven compressor, and the capacity of
P450-P650 is controlled by No.1 and No.2 compressors.
• The following table shows the frequency change of the inverter compressor during normal operation.
(1) No. 2 compressor operation/stop (P450-P650 types only)
1
No. 2 compressor going from stop to in-operation
When No.1 compressor does not meet the capacity requirement, No.2 compressor will start its operation.
2
No. 2 compressor going from in-operation to stop
When an operation of both No.1 and No.2 compressors exceeds the capacity requirement, No.2 compres-
sor will stop its operation.
(2) Pressure limit
The maximum limit of high pressure (Pd) is set for each frequency level. If this limit is exceeded, the frequency
will be reduced every 30 seconds.
(3) Discharge temperature limit
The discharge temperature (Td) of the compressor in operation is detected, and if it exceeds the upper limit,
the frequency is reduced by 5 Hz.
• Control is performed 30 seconds after compressor start-up and every 30 seconds thereafter.
• Operating temperature is 105˚C for P200 type and 115˚C for P250-P650 types.
(4) Periodic frequency control
Frequency control other than the ones performed at startup, upon status change, and for protection is called
periodic frequency control (conversent control) and is performed in the following manner.
1
Periodic control cycle
Periodic control is performed after the following time has passed
(a) 30 seconds after either compressor start up or the completion of defrost operation
(b) 30 seconds after frequency control by discharge temperature or by pressure limit
2
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).
