Processes and Functions
6
TD831077
VI - 3
2. Protection Controls
PC unit (PC compressor, AC compressor) PC unit (SC compressor), AD unit
106 °C Compressor OFF 135 °C Compressor OFF
Compressor ON Compressor ON
Table 3
Table 4
PC unit (PC compressor, AC compressor) PC unit (SC compressor), AD unit
90 °C 90 °C
Table 5
PC unit (PC compressor, AC compressor) PC unit (SC compressor), AD unit
90 °C 90 °C
Compressor capacity
Lock current Overload current
Ar Ao
Rotary 4 H.P. 33 27
compressor 5 H.P. 36 30
Scroll 8 H.P. 56 46
compressor 10 H.P. 72 60
Table 6
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¶ If the C.C.U. target capacity decreases, the C.C.U. target capacity does not increase for one minute.
¶ If the outdoor unit capacity decreases, the capacity does not increase for one minute. However, the case in (6)
under "1-1. Compressor capacity control" is an exception.
(1) Discharge temperature control
Discharge temperature control is determined based on the type of installed compressors regardless of the outdoor
model.
1 High discharge temperature
The outdoor unit is stopped when the protection mechanism of the PC compressor is activated.
The outdoor unit is stopped when the protection mechanism of the AD unit compressor is activated.
* After compressor operation, a warning is issued if operation is stopped four consecutive times after less than
five minutes (less than two minutes for the scroll compressor) by the above control.
2 Startup protection temperature
The compressors do not operate if the discharge temperature of the stopped compressors are higher than the
temperatures in the table 4.
3 Discharge temperature sensor error
A warning is issued if the discharge temperature is higher than the temperatures in the table 5 even when the
compressor is stopped for 15 minutes.
(2) Current control
Current control is determined based on the installed compressors regardless of the outdoor model.
1 Lock current
A warning is issued if the current value of the compressors that are operating exceeds Ar.
2 Overload current
A warning is issued if the current value of the compressors that are operating exceeds Ao for 30 seconds.
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