Stop Valve Operation Procedure - Daikin RWEYQ72PCYD Installation Manual

2.
After the vacuum drying is finished, charge the additional refrigerant
in its liquid state through the liquid pipe stop valve service port. Tak-
ing into account following instructions:
• Check that gas and liquid pipe stop valves are closed.
• Stop the compressor and charge the specified weight of refriger-
ant.
(If the outside unit is not in operation and the total amount cannot be
charged, follow the Additional refrigerant charge procedure (2)
shown below.)
NOTE
• Procedures for charging additional refrigerant.
(Refer to figure 24)
1. Pressure reducing valve
2. Nitrogen
3. Refrigerant tank
4. With a siphon
5. Measuring instrument
6. Vacuum pump
7. Valve A
8. Valve B
9. Charge hose
10. Outside unit
11. Gas side
12. Liquid side
13. Discharge gas side
14. Suction gas side
15. Stop valve service port
16. To indoor unit
17. To indoor units / Branch Selector units
18. Dotted lines represent onsite piping
Additional refrigerant charge procedure (2)-by Additional refriger-
ant charge operation
To learn the system settings for additional refrigerant charging, refer to
the [Service Precautions] label attached on the back of the control box
cover 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 pipe 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 (40°C) or less.)
3.
After the system is charged with a specified amount of refrigerant,
press the RETURN button (BS3) on the printed circuit board (A1P)
in the outside unit to stop the additional refrigerant charge operation.
4.
Immediately open both liquid and gas pipe stop valve.
(If the stop valve is not opened immediately, liquid seal may
cause the pipes to burst.)
NOTE
• If the refrigerant cylinder is siphonal, set it upright while charging
additional refrigerant.
16

9-10 Stop valve operation procedure

CAUTION
Do not open the stop valve until 1-6 of "9-8 Checking of device and
installation conditions" are completed. If the stop valve is left open
without turning on power supply, 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 hexa-
gon wrench.
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.
Closing stop valve
1.
Remove the cap and turn the valve clockwise with the hexagon
wrench.
2.
Securely tighten the valve until the shaft contacts the main body
seal.
3.
Make sure to tighten the cap securely.
∗ For the tightening torque, refer to the table on the below.
Tightening torque
Tightening torque (ft.·lbf. (N·m)) (Turn clockwise to close)
Stop
Shaft
valve size
(valve body)
Hexagonal
Liquid 3.98-4.87 9.95-12.17
wrench
side (5.4-6.6) (13.5-16.5)
1/8 in. (4 mm)
Hexagonal
Gas 19.91-24.33 26.54-32.44
wrench
side (27-33)
3/8 in. (10 mm)
(Refer to figure 25)
1. Service port
2. Cap
3. Hexagon hole
4. Shaft
5. The main body seal
〈Caution〉
• Do not damage the cap sealing.
• Always use a charge hose for service port connection.
• After tightening the cap, check that no refrigerant leaks are present.
• After working, securely tighten the cover of service port without fail
by specified torque.
• When loosening a flare nut, always use two wrenches in combina-
tion. When connecting the piping, always use a spanner and torque
wrench in combination to tighten the flare nut.
• When connecting a flare nut, coat the flare (inner and outer faces)
with ether oil or ester oil and hand-tighten the nut 3 to 4 turns as the
initial tightening.
• Do not forget to open the stop valve before starting operation.
(Refer to figure 26)
1. Remove the cap and turn the valve counterclockwise with
the hexagon wrenches until it stops.
2. Discharge gas side
3. Liquid side
4. Suction gas side
5. Never remove the partition flange for any reason.
6. Full close on the suction gas side
Cap Gas side
(valve Service port Flare nut accessory
cover) pipe (1)
8.48-10.25 24.1-29.4 _
(11.5-13.9) (32.7-39.9)
8.48-10.25 _ 16.22-20.65
(36-44) (11.5-13.9) (22-28)
English