Capacity Control; Current Release Control - Toshiba RAS-B10GKVP-E Service Manual

Item

4. Capacity control

Indoor unit A
Indoor unit B
Outdoor Operation
unit mode
M18GAV-E
Cooling
M18GACV-E
M18GAV-E Heating
M14GAV-E
Cooling
M14GACV-E
M14GAV-E Heating
5. Current release This function prevents troubles on the electronic parts of the
control compressor driving inverter.
This function also controls drive circuit of the compressor
speed so that electric power of the compressor 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
16˚C
11˚C
Operation flow and applicable data, etc.
Outdoor unit
Inverter
No.of Combination
operating unit of indoor units
10
1 unit 13
16
10
13
2 units
13
16
10
1 unit 13
16
10
13
2 units
13
16
10
1 unit
13
10
2 units
13
10
1 unit
13
10
2 units
13
Setup of current release point
High
Reduce compressor speed
Cooling current
release value
7.5A
39˚C
15.5˚C
12.0A
10.5˚C
Compressor
Compressor
revolution (rps)
— 13 to 045
— 13 to 071
— 13 to 079
10 15 to 083
10 15 to 083
13 15 to 083
10 15 to 083
— 13 to 076
— 13 to 099
— 13 to 102
10 15 to 120
10 15 to 120
13 15 to 120
10 15 to 120
— 13 to 056
— 13 to 074
10 18 to 074
10 18 to 075
— 13 to 075
— 13 to 080
10 16 to 084
10 16 to 085
Outdoor temp. To
Current decrease
Heating current
release value
10.1A
10.3A
10.5A
– 43 –
Description
1) Indoor unit A and Indoor unit B
determine the respective
instruction revolutions from the
difference between the remote
controller setting temperature
(Ts) and the indoor temperature
(Ta), and transmit this to the
outdoor unit.
2) The outdoor unit receives the
instructions from the indoor units,
and the inverter operates the
compressor at the calculated
revolutions.
3) The compressor operation range
in each operating mode is shown
in the left table.
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 commanded from the
indoor unit within the range which
does not exceed the specified
value.