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6. Release protective
<In cooling/dry operation>
control by tempera-
(Prevent-freezing control for indoor heat exchanger)
ture of indoor heat
In cooling/dry operation, the sensor of indoor heat
exchanger
exchanger detects evaporation temperature and
controls the compressor speed so that temperature of
the heat exchanger does not exceed the specified
value.
Usual cooling capacity control
7 C
6 C
5 C
Reduction of compressor speed
<In heating operation>
(Prevent-overpressure control for refrigerating cycle)
In heating operation, the sensor of indoor heat ex-
changer detects condensation temperature and controls
the compressor speed so that temperature of the heat
exchanger does not exceed the specified value.
Reduction of compressor speed
55 C
52 C
48 C
Usual heating capacity control
Operation flow and applicable data, etc.
R
Q
P
P
Q
R
– 39 –
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
When the value is
control in cooling operation.
in Q zone, the
(R zone)
compressor speed
is kept.
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)
When the value is
3) When temperature of the indoor
in Q zone, the
compressor speed
heat exchanger does not rise to
is kept.
50°C, or when it drops below to
46°C, the capacity control
operation returns to the usual
control in heating operation.
(R zone)
FILE NO. SVM-15040-2
Description
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