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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 specified 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)
<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.
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)
Item
Operation flow and applicable data, etc.
Description
7˚C
6˚C
5˚C
R
Q
P
Usual cooling capacity control
Reduction of compressor speed
Indoor heat e
xchanger temper
ature
When the value is
in Q zone, the
compressor speed
is kept.
55˚C
52˚C
48˚C
P
Q
R
Reduction of compressor speed
Usual heating capacity control
Indoor heat e
xchanger temper
ature
When the value is
in Q zone, the
compressor speed
is kept.
+00A10-023_01EN.book Page 64 Wednesday, April 6, 2011 2:43 PM
Содержание RAS-4M27UAV-E
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