Daikin VRV - WII Service Manual page 73

Stop
In heating operation or simultaneously in cooling / heating operation :
The system operates in mode A or mode B listed in the table below.
Parts name
Compressor
Inverter cooling fan
4 way valve (Main)
4 way valve (for heat exchanger)
Main heat exchanger electronic exp.
valve
Sub-cooling electronic exp. valve
Hot gas bypass solenoid valve
Water heat exch. oil return solenoid valve
Receiver gas charging solenoid valve
Receiver gas discharge solenoid valve
Non-operation unit liquid pipe stop
solenoid valve
Mode transition conditions
Ending conditions
∗ Mode A or B operation

Mode A : Master unit collects refrigerant.


Mode B : Slave unit storage refrigerant.
The changeover operation for mode A and B is performed for the reason that the required refrigerant amount varies
depending on the indoor unit operation capacity.
2.1.3 Abnormal Stop
In order to protect compressors, if any of the following items has an abnormal value, the system will
make "stop with thermostat OFF" and the malfunction will be determined according to the number
of retry times.
Item
1. Low pressure abnormal
2. High pressure abnormal
3. Discharge temperature
abnormal
4. Power supply abnormal
5. Inverter current abnormal
6. Radiation fin temperature
abnormal
60
Symbol
—
—
20S1
20S2
EV1
EV3
SVP
SVE
SVL
SVG
SVSL
Master
unit
Judgement value
10.1psi
537psi
275°F
Reverse phase
17A for 5 sec. (380V power supply)
25.1A for 260 sec. (220V power supply)
192.2°F
Electrical
Mode A operation
symbol
(M1C) OFF
(M1, 2F) OFF
(Y5S) Holding
(Y7S) Holding
(Y1E) 0 pulse
(Y3E) 0 pulse
(Y1S) OFF
(Y2S) OFF
(Y3S) ON
(Y4S) OFF
(Y6S) OFF
To Mode B when No gas
shortage signal is sent
from indoor unit
Slave units are required to operate.
Slave
unit
Retry number
3 times in 60 minutes
2 times in 30 minutes
2 times in 100 minutes
No retry
3 times in 60 minutes
3 times in 60 minutes
SiUS30-604
Mode B operation
OFF
OFF
Holding
Holding
0 pulse
0 pulse
OFF
OFF
OFF
OFF
ON
To Mode A when gas
shortage signal is sent
from indoor unit
Malfunction code
E4
E3
F3
U1
L8
L4
Function