Maximum And Minimum Frequency Control; Current Release Control; Cooling High-Load Prevention Control - Sanyo SPW-C256VH Technical Data & Service Manual

2) Maximum and Minimum Frequency Control

The compressor's inverter frequency is controlled in accordance with the model and operation mode.
The maximum and minimum frequencies for each model are shown in the table below.
* There are cases in which frequency is limited with other control functions depending on operational conditions,
so operations are not always carried out in accordance with the maximum frequencies listed below.
<Single-phase>
Type
Maximum Frequency (Hz)
Minimum Frequency (Hz)
<3-phase>
Type
Maximum Frequency (Hz)
Minimum Frequency (Hz)
* There are cases in which the frequency is set at 24.0Hz~28.0Hz to protect the compressor in accordance with
outdoor air temperature and indoor loads.

3) Current Release Control

The inverter frequency is controlled so that the current value for the inverter compressor is less than the fi gure
listed in the table below only in the cooling mode in order to prevent abnormal increases in the inverter circuit
located within the outdoor unit's electrical box.
(1) Current release control with primary current : The limited values are modifi ed in accordance with outdoor
<Single-phase>
Type 256
Cooling 17.0
Is(A)
Heating 17.5
NOTE
The limited values are lowered when the outdoor air temperature is higher than 40
and higher than 14

4) Cooling High-Load Prevention Control

This control is performed to limit the inverter frequency in order to restrict abnormal increases in pressure and
high-load operations in the cooling mode. In accordance with the temperature of the outdoor heat exchanger
temperature sensors (C1, C2), such controls are performed as halting the operations of the indoor unit,
decreasing the inverter frequency and restricting its increase, etc. If the temperature max (C1, C2) exceeds
64 , operations of the indoor unit are halted and then restarted 3 minutes later. If this start/stop activity is
repeated 10 times consecutively, alarm "P20" (cooling high-load error) occurs.
max. (C2, C1)
a
b
c
d
e
256
Cooling 98.0
Heating 103.2
Cooling 15.0*
Heating 15.0*
256
Cooling 63.0
Heating 69.0
Cooling 28.2
Heating 28.2
air temperature.
366 486
21.0 28.5
22.0 28.5
in the heating mode.
Outdoor unit operations halted
Frequency decreased
Frequency increases prevented
Frequency increased slower than normal
Normal operations (no control)
366 486
87.0 78.0
95.2 80.0
18.0* 20.0*
18.0* 20.0*
366 486 606
87.0 78.0 80.0
95.2 80.0 85.0
28.2 20.0* 20.0*
28.2 20.0* 20.0*
<3-phase>
Type 256
Cooling 4.8
Is(A)
Heating 4.8
<Single-phase>
Type
a
b
c
d
e
<3-phase>
Type
a
b
c
d
e
4-3
366 486 606
6.2 12.0 13.5
6.2 13.0 15.0
in the cooling mode
256 366 486
64 64 61
60 59 55
58 57 53
57 56 51
53 53 49
256 366 486 606
64 64 61 61
64 64 57 57
55 55 55 55
55 55 53 53
55 55 51 51
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