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7˚C
6˚C
5˚C
R
Q
P
56˚C
52˚C
48˚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.
Item
6. Release protective
control by tempera-
ture 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
exchanger detects evaporation temperature and controls
the compressor speed so that temperature of the heat
exchanger does not exceed the specified value.
<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 specified value.
Description
1) When temperature of the indoor
heat exchanger drops below 5°C,
the compressor speed is re-
duced. (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 52°C to 56°C, the compres-
sor speed is kept.
(Q zone)
When temperature of the indoor
heat exchanger drops in the
range from 48°C to under 56°C,
the compressor speed is kept.
(Q zone)
2) When temperature of the indoor
heat exchanger rises to 56°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)