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Item Operation fl ow and applicable data, etc. Description
6. Release protective control
by temperature of indoor
heat exchanger
<In cooling/dry operation>
(Prevent-freezing control for indoor heat exchanger)
In cooling/dry operation, the sensor of indoor heat
exchanger detects evaporation temperature and
controls the compressor speed so that temperature
of the heat exchanger does not exceed the specifi ed
value.
1) When temperature of the
indoor heat exchanger drops
below 5°C, the compressor
speed is reduced. (P zone)
2) When temperature of the
indoor heat exchanger rises
in the range from 6°C to
under 7°C, the compressor
speed is kept. (Q zone)
3) When temperature of the
indoor heat exchanger rises
to 7°C or higher, the capacity
control operation returns to
the usual control in cooling
operation. (R zone)
7˚C
6˚C
5˚C
R
Q
P
Usual cooling capacity control
Reduction of compressor speed
Indoor heat exchanger temperature
When the value is
in Q zone, the
compressor speed
is kept.
<In heating operation>
(Prevent-overpressure control for refrigerating cycle)
In heating operation, the sensor of indoor heat
exchanger detects condensation temperature and
controls the compressor speed so that temperature
of the heat exchanger does not exceed the specifi ed
value.
1) When temperature of the
indoor heat exchanger rises
in the range from 52°C to
55°C, the compressor speed
is kept. (Q zone)
When temperature of the
indoor heat exchanger drops
in the range from 48°C to
under 55°C, the compressor
speed is kept. (Q zone)
2) When temperature of the
indoor heat exchanger
rises to 55°C or higher,
the compressor speed is
reduced. (P zone)
3) When temperature of the
indoor heat exchanger does
not rise to 52°C, or when
it drops below to 48°C, the
capacity control operation
returns to the usual control in
heating operation. (R zone)
55˚C
52˚C
48˚C
P
Q
R
Reduction of compressor speed
Usual heating capacity control
Indoor heat exchanger temperature
When the value is
in Q zone, the
compressor speed
is kept.
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