Daikin VRV-WIII RWEYQ72PTJU Service Manual page 133

SiUS30-1301
 Procedures for charging additional refrigerant.
[Heat Pump system]
Pressure
reducing valve
[Heat Recovery system]
Pressure
reducing valve
Additional refrigerant charge procedure (2)-by Additional refrigerant charge operation
About the system settings for additional refrigerant charge operation, refer to the [Service Precaution] label attached on the
Electrical Components Box lid in the condensing unit.
1. Fully open all stop valves (valve A and valve B must be left fully closed).
2. After 10 minutes, fully close liquid line stop valve and then,open the valve by turning 180°.
Start the additional refrigerant charge operation.
See [Service precautions] Label for detail.
If it is difficult to charge the refrigerant additionally, decrease the water temperature or warm the refrigerant tank.
(Warm the refrigerant tank with a stupe or a warm hot water of 40 degrees or less.)
3. After the system is charged with a specified amount of refrigerant, press the RETURN button (BS3) on the PCB (A1P) in
the condensing unit to stop the additional refrigerant charge operation.
4. Immediately open both liquid-side and gas-side stop valve.
(If do not open the stop valve immediately, liquid seal may cause the pipe to burst.)
Stop valve operation procedure
Caution
Do not open the stop valve until checking of device and installation conditions are completed. If the stop valve is left open
without turning on power, it may cause refrigerant to buildup in the compressor, leading to insulation degradation.
Opening stop valve
1. Remove the cap and turn the valve counterclockwise with the hexagon wrench (JISB4648).
2. Turn it until the shaft stops.
Do not apply excessive force to the stop valve. Doing so may break the valve body, as the valve is not a backseat type.
Always use the hexagon wrench.
3. Make sure to tighten the cap securely.
Field Setting
Close
Close
R-410A
Refrigerant
tank
With
a siphon
Measuring instrument
Close
Close
R-410A
Refrigerant
tank
With
a siphon
Measuring instrument
Gas side
Condensing
unit
Charge hose
Valve A
To Indoor unit
Vacuum pump
Discharge
gas side
Condensing
unit
Charge hose
Valve A
Valve B
To Indoor units /
Branch Selector
units
Vacuum pump
Field Setting from Condensing Unit
Liquid
Condensing
side
unit
Stop valve service port
Dotted lines represent
onsite piping
Suction
gas side
Condensing
Liquid
unit
side
Stop valve service port
Dotted lines represent
onsite piping
125