Daikin R410A Split Series Installation Manual page 9

• Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque
wrenches.
Spanner
Piping union
Gas side
3/8 inch
32.7-39.9N • m
(333-407kgf • cm)
5.
Evacuating the air with a vacuum pump and checking gas leakage
WARNING
• Do not mix any substance other than the specified refrigerant (R410A) into the refrigeration
cycle.
• When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
• R410A, as well as other refrigerants, should always be recovered and never be released
directly into the environment.
• Use a vacuum pump for R410A exclusively. Using the same vacuum pump for different refrig-
erants may damage the vacuum pump or the unit.
• When piping work is completed, it is necessary to evacuate the air with a vacuum
pump and check for gas leakage.
• If using additional refrigerant, perform air evacuating from the refrigerant pipes
and the domestic hot water tank using a vacuum pump, then charge additional refrig-
erant.
• Use a hexagonal wrench (4mm) to operate the stop valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench at the specified
tightening torque.
1) Connect projection side of charging hose (which comes from gauge manifold) to gas stop valve's service port.
2) Fully open gauge manifold's low-pressure valve (Lo) and completely close its high-pressure valve (Hi).
(High-pressure valve subsequently requires no operation.)
3) Do vacuum pumping and make sure that the compound pressure gauge reads –0.1MPa (–76cmHg).*1
4) Close gauge manifold's low-pressure valve (Lo) and stop vacuum pump.
(Keep this state for a few minutes to make sure that the compound pressure gauge pointer does not swing back.)*2
5) Remove caps from liquid stop valve and gas stop valve.
English
[Tighten]
Torque wrench
Flare nut
Flare nut tightening torque
Liquid side
1/4 inch
14.2-17.2N • m
(144-175kgf • cm)
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
Valve cap tightening torque
Gas side
3/8 inch
21.6-27.4N • m
(220-280kgf • cm)
Service port cap tightening torque
10.8-14.7N • m (110-150kgf • cm)
[Apply oil]
Apply refrigeration oil to
the inner surface of the
flare.
Liquid side
1/4 inch
21.6-27.4N • m
(220-280kgf • cm)
Compound Pressure
pressure gauge metre
Gauge
manifold
Valve caps
High-
Low-pressure
pressure
valve
valve
Charging
hoses
Vacuum pump Service port
Gas stop valve
Liquid
stop
valve
7