Item
Operation flow and applicable data, etc.
Description
Indoor unit A
Inverter
Outdoor unit
Compressor
Indoor unit B
Indoor unit C
3.
Capacity
control
1)
Three
indoor units from A to
C
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.
Outdoor temp. To
Setup of current release point
Capacity control continues.
Current decrease
Outdoor unit inverter main
circuit control current
High
Setup value
Low
Reduce compressor speed
Operating current
≤
4.
Current release
control
This function prevents troubles on the electronic parts of the
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.
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.
5
.
Compressor
protective
control
1) This control purposes to raise the operation frequency until
45
Hz for 2 minutes in order to
protect
the compressor (Prevention of oil accumulation in the refrigerating cycle) when the status
that
the operation frequency is
45
Hz or less has continued for 10 hours was calculated.
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.
RAS-
2
M2
1
U2AC
V
G
-SG
Operation
No.of
Compressor
mode
operating
revolution
unit
Combination
of indoor units
(kBTU)
(rps)
COOL
1 unit
10
15〜46
13
15〜70
1
8
15〜78
2 units
*
25〜
58
3 units
*
-
-
〜38
Sleep or
Q
uiet
operation
Compressor
revolution
Combination
of indoor units
(kBTU)
(rps)
10
15〜
39
13
15〜
54
1
8
15〜
62
*
25〜8
0
*
25〜
69
38
〜38
RAS-
3
M
3
1
U2AC
V
G
-SG
Outdoor temp.
10.5
A
Cooling current release value
8.5
A
45
˚C
40
˚C
44
˚C
39
˚C
8
.5
A
10.5
A
RAS-3M3
1
U2ACVG-SG
8.5
A
6.8
A
RAS-
2
M
2
1
U2ACVG-SG
Compressor
revolution
Combination
of indoor units
(kBTU)
(rps)
10
15〜
46
13
15〜
70
1
8
15〜
78
*
25〜
58
*
25〜
80
38
〜38
RAS-
3
M
4
1
U2AC
V
G
-SG
10.5
A
RAS-3M
41
U2ACVG-SG
8.5
A
6.8
A
- 38 -