Daikin VRV - WII, Service Manual

Page: 73 / 312

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