Current Release Control; Release Protective Control By Temperature Of Indoor Heat Exchanger; In Cooling/Dry Operation; In Heating Operation - Toshiba RAS-4M23SAV-E Service Manual

Item
5. Current release This function prevents troubles on the electronic parts
control 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.
Outdoor unit inverter main
circuit control current
£
Operating current Setup value
Low
Capacity control continues.
Outdoor temp.
40˚C
39˚C
16˚C
15.5˚C
11˚C
10.5˚C
6. Release protective <In cooling/dry operation>
control by tem-
(Prevent-freezing control for indoor heat exchanger)
perature of indoor
In cooling/dry operation, the sensor of indoor heat
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
TC
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
TC
55˚C
52˚C
46˚C
Usual heating capacity control
Operation flow and applicable data, etc.
Outdoor temp. To
Setup of current release point
High
Reduce compressor speed
Current decrease
Cooling current
release value
9.6A
10.8A
R
When the value is in Q zone,
Q
the compressor speed is kept.
P
P
When the value is in Q zone,
Q
the compressor speed is kept.
R
1) The input current of the outdoor unit
2) According to the detected outdoor
3) Whether the current value exceeds
4) If the current value exceeds the
Heating current
release value
10.6A
10.7A
10.8A
1) When temperature of the indoor heat
2) When temperature of the indoor heat
3) When temperature of the indoor heat
1) When temperature of the indoor heat
When temperature of the indoor heat
2) When temperature of the indoor heat
3) When temperature of the indoor heat
– 48 –
Description
is detected in the inverter section of
the outdoor unit.
temperature, the specified value of
the current is selected.
the specified value or not is judged.
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.
exchanger drops below 5°C, the
compressor speed is reduced.
(P zone)
exchanger rises in the range from
6°C to under 7°C, the compressor
speed is kept. (Q zone)
exchanger rises to 7°C or higher, the
capacity control operation returns to
the usual control in cooling operation.
(R zone)
exchanger rises in the range from
52°C to 55°C, the compressor speed
is kept. (Q zone)
exchanger drops in the range from
46°C to under 55°C, the compressor
speed is kept. (Q zone)
exchanger rises to 55°C or higher, the
compressor speed is reduced. (P zone)
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)