Daikin VRV-WIII RWEYQ72PTJU Service Manual page 53

SiUS30-1301
 Heating or simultaneously cooling/heating operation
The system operates in mode A or mode B listed in the table below.
Parts Name
Inverter compressor
Inverter cooling fan
Four-way valve (Main)
Four-way valve (Sub)
Electronic expansion valve (Main)
Electronic expansion valve (Subcooling)
Solenoid valve (Hot gas)
Solenoid valve (Oil return of water heat
exchanger)
Solenoid valve (Receiver gas charging)
Solenoid valve (Receiver gas
discharging)
Solenoid valve (Non-operating unit liquid
pipe closing)
Mode transition conditions
Ending conditions
Note:
∗1 Mode A or B operation
⎧
⎨
⎩
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 error will be determined according to the number of retry
times.
Item
Low pressure abnormality
High pressure abnormality
Discharge pipe temperature
abnormality
Power supply abnormality
Inverter current abnormality
Radiation fin temperature
abnormality
Function and Control
Symbol
—
—
20S1
20S2
EV1
EV3
SVP
SVE
SVL
SVG
SVSL
Mode A: Master unit collects refrigerant.
Mode B: Slave unit storage refrigerant.
Judgement Value
10.1 psi
580 psi
275°F
Reverse phase
230V unit: 26.1A for 260 sec.
or 31.0A for 5 sec.
460V unit: 14.5A for 260 sec.
or 17.0A for 5 sec.
192.2°F
Electric
Mode A Operation (1)
Symbol
M1C OFF
M1F, M2F 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
refrigerant shortage signal
is sent from indoor unit
Slave units are required to operate.
Master
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
Mode B Operation (1)
OFF
OFF
Holding
Holding
0 pulse
0 pulse
OFF
OFF
OFF
OFF
ON
To Mode A when
refrigerant shortage signal
is sent from indoor unit
Slave
unit
Error Code
E4
E3
F3
U1
L8
L4
Stop
45