– 48 –
Item
5. Current release
control
Operation flow and applicable data, etc.
This function prevents troubles on the electronic parts
of the compressor driving inverter.
This function also controls drive circuit of the com-
pressor speed so that electric power of the compres-
sor drive circuit does not exceed the specified value.
Description
1) The input current of the outdoor unit
is detected in the inverter section of
the outdoor unit.
2) According to the detected outdoor
temperature, the specified value of
the current is selected.
3) Whether the current value exceeds
the specified value or not is judged.
4) If the current value exceeds the
specified value, this function reduces
the compressor speed and controls
speed up to the closest one com-
manded from the indoor unit within
the range which does not exceed the
specified value.
Outdoor temp. To
Setup of current release point
Capacity control continues.
Outdoor temp.
40˚C
9.6A
10.8A
10.6A
10.7A
10.8A
16˚C
39˚C
11˚C
15.5˚C
10.5˚C
Cooling current
release value
Heating current
release value
Outdoor unit inverter main
circuit control current
High
Low
Reduce compressor speed
Operating current
£
Setup value
Current decrease
<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 ex-
changer detects condensation temperature and controls
the compressor speed so that temperature of the heat
exchanger does not exceed the specified value.
6. Release protective
control by tem-
perature of indoor
heat exchanger
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
52°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)
7˚C
6˚C
5˚C
R
Q
P
Q
R
P
55˚C
TC
TC
52˚C
46˚C
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.
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.
Summary of Contents for RAS-4M23SACV-E
Page 27: ... 27 4 2 Outdoor Unit RAS 4M23SAV E RAS 4M23SACV E ...
Page 114: ... 114 MCC 1438 ...
Page 115: ... 115 MCC 818 ...
