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

Item
4. Capacity
1) Four indoor units from A to D determine the respective instruction revolutions from the differ-
control
ence 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.
No.of
Operation
operating
mode
unit
1 unit
COOL
2 units
3 units
4 units
∗
: In case that any multiple indoor units are combined.
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.
Indoor unit A
Indoor unit B
Indoor unit C
Indoor unit D
Compressor
Combination
revolution
of indoor units
(rps)
M10 20 to 28
M13 20 to 43
M16 20 to 53
¡ ∗
20 to 66
¡ ∗
31 to 69
¡ ∗
31 to 69
Setup of current release point
£ High
Reduce compressor speed
Cooling current
release value
9.6A
39˚C
15.5˚C
14.2A
10.5˚C
Outdoor unit
Inverter Compressor
No.of
Operation
operating
mode
unit
1 unit
HEAT
2 units
3 units
4 units
Outdoor temp. To
Current decrease
Heating current
release value
14.4A
14.4A
14.5A
– 56 –
Description
Compressor
Combination
revolution
of indoor units
(rps)
M10 15 to 52
M13 15 to 63
M16 15 to 67
¡ ∗
15 to 90
¡ ∗
17 to 90
¡ ∗
22 to 90
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.