Capacity Control; Current Release Control; Compressor Protective Control - Toshiba RAS-2M21U2ACVG-SG Service Manual

Item
3. Capacity
1) Three indoor units from A to C determine the respective instruction revolutions from the
control
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.
Operation
mode
COOL
4. 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.
45˚C
40˚C
5. Compressor 1) This control purposes to raise the operation frequency until 45Hz for 2 minutes in order to protect
the compressor (Prevention of oil accumulation in the refrigerating cycle) when the status that
protective
the operation frequency is 45Hz or less has continued for 10 hours was calculated.
control
The operation frequency follows the normal indoor command after controlling.
2) Although the compressor may stop by THERMO-OFF control when the room temperature varies
and then attains the set temperature by this control, it is not abnormal.
3) During this control works, it stopping the operation by the remote controller, the operation does
not continue.
Operation flow and applicable data, etc.
Indoor unit A
Indoor unit B
Indoor unit C
RAS-2M21U2ACVG-SG
No.of Combination Compressor
operating of indoor units
unit (kBTU)
1 unit 10
13
18
2 units *
3 units *
Sleep or Quiet -
operation
Setup of current release point
High
Reduce compressor speed
Current decrease
Outdoor temp.
RAS-2M21U2ACVG-SG
44˚C
39˚C
Outdoor unit
Inverter Compressor
RAS-3M31U2ACVG-SG
Combination Compressor
revolution of indoor units revolution
(rps) (kBTU) (rps)
15〜46 10 15〜39
15〜70 13 15〜54
15〜78 18 15〜62
25〜58 * 25〜80
-
* 25〜69
38
〜38 〜38
Outdoor temp. To
Cooling current release value
RAS-3M31U2ACVG-SG
8.5 A 6.8 A
8.5 A 8.5 A
10.5 A 10.5 A
- 38 -
Description
RAS-3M41U2ACVG-SG
Combination Compressor
of indoor units revolution
(kBTU) (rps)
10 15〜46
13 15〜70
18 15〜78
* 25〜58
* 25〜80
38
〜38
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.
RAS-3M41U2ACVG-SG
6.8 A
8.5 A
10.5 A