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Item
6. Release
protective
control by
temperature of
indoor heat
exchanger
Operation flow and applicable data, etc.
<In cooling/dry operation>
(Prevent-freezing control for indoor heat exchanger)
In cooling/dry operation, the sensor of indoor heat ex-
changer detects evaporation temperature and controls the
compressor speed so that temperature of the heat ex-
changer does not exceed the specified value.
Description
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)
1) When temperature of the indoor
heat exchanger rises in the
range from 50°C to 55°C, the
compressor speed is kept.
(Q zone)
When temperature of the indoor
heat exchanger drops in the
range from 46°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
50°C, or when it drops below to
46°C, the capacity control
operation returns to the usual
control in heating operation.
(R zone)
<In heating operation> (Heat pump model)
(Prevent-overpressure control for refrigerating cycle)
In heating operation, the sensor of indoor heat exchanger
detects condensation temperature and controls the com-
pressor speed so that temperature of the heat exchanger
does not exceed the specified value.
7˚C
6˚C
5˚C
R
Q
P
55˚C
50˚C
46˚C
P
Q
R
Usual cooling capacity control
Reduction of compressor speed
Indoor heat exchanger temperature
When the value is
in Q zone, the
compressor speed
is kept.
Reduction of compressor speed
Usual heating capacity control
Indoor heat exchanger temperature
When the value is
in Q zone, the
compressor speed
is kept.