Daikin VRV - WII, Service Manual

Page: 144 / 312

SiUS30-604 Field Setting
Test Operation 131
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Procedures for charging additional refrigerant.
Additional refrigerant charge procedure (2)-by Additional refrigerant charge operation
To learn the system settings for additional refrigerant charging, refer to the [Service Precaution]
label attached on the back of the electric box lid in the outside unit.
1. Fully open all stop valves (valve A and valve B must be left fully closed).
2. After ten 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 104 °F or less.)
3. After the system is charged with a specified amount of refrigerant, press the RETURN button
(BS3) on the PC board (A1P) in the outside 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.)
Note If the refrigerant cylinder is siphonal, set it upright while charging additional refrigerant.
Stop valve operation procedure
Caution Do not open the shutoff 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 special tool.
3. Make sure to tighten the cap securely.