Stop; Stopping Operation - Daikin VRV-WIII RWEYQ72PTJU Service Manual

Stop

2. Stop

2.1

Stopping Operation

This operation defines the operation of the actuator while the system stops.
2.1.1 When System is in Stop Mode
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)
Branch Selector unit
2.1.2 Stopping Operation of Slave Units During Master Unit is in Operation
with Multi Condensing Unit System
This operation makes adjustments of required refrigerant amount with non-operating slave units
while the master unit is in operation.
 Cooling
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.
44
Symbol
—
—
20S1
20S2
EV1
EV3
SVP
SVE
SVL
SVG
SVSL
Mode A: Master unit collects refrigerant.
Mode B: Slave unit storage refrigerant.
Symbol Electric Symbol
— M1C
— M1F, M2F
20S1 Y5S
20S2 Y7S
EV1 Y1E
EV3 Y3E
SVP Y1S
SVE Y2S
SVL Y3S
SVG Y4S
SVSL Y6S
Electric Symbol Mode A Operation (1)
M1C OFF
M1F, M2F OFF
Y5S Holding
Y7S Holding
Y1E 150 to 300 pulse
Y3E 0 pulse
Y1S OFF
Y2S
Y3S OFF
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
Actuator Function
OFF
OFF
Holding
Holding
0 pulse
0 pulse
OFF
OFF
OFF
OFF
ON
Indoor unit thermostat ON
Mode B Operation (1)
ON
To Mode A when
refrigerant shortage signal
is sent from indoor unit
Slave
unit
Function and Control
SiUS30-1301
OFF
OFF
Holding
Holding
0 pulse
0 pulse
OFF
OFF
OFF
OFF
ON