5
■
English
Outdoor Unit Installation
4.
Refrigerant piping.
1) 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.
• Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and escaping gas.
2) To prevent gas leakage, apply refrigeration oil on both inner and outer surfaces of the flare. (Use refrigeration oil for
R410A.)
5.
Purging air and checking gas leakage.
• When piping work is completed, it is necessary to purge the air and check for gas leakage.
WARNING
1) Do not mix any substance other than the specified refrigerant (R410A) into the refrigeration cycle.
2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
3) R410A, as well as other refrigerants, should always be recovered and never be released directly into the environment.
4) Use a vacuum pump for R410A exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum
pump or the unit.
• If using additional refrigerant, perform air purging from the refrigerant pipes and
indoor unit using a vacuum pump, then charge additional refrigerant.
• 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.
Coat here with refrigeration oil
Torque wrench
Piping union
Flare nut
Spanner
Flare nut tightening torque
Gas side
Liquid side
3/8 inch
1/4 inch
32.7-39.9N
l
m
14.2-17.2N
l
m
(333-407kgf
l
cm)
(144-175kgf
l
cm)
Valve cap tightening torque
Gas side
Liquid side
3/8 inch
1/4 inch
21.6-27.4N
l
m
21.6-27.4N
l
m
(220-280kgf
l
cm)
(220-280kgf
l
cm)
Service port cap
10.8-14.7N
l
m
tightening torque
(110-150kgf
l
cm)
Compound
pressure gauge
Pressure
meter
High-
pressure
valve
Low-pressure
valve
Vacuum pump
adapter
Vacuum pump
Service port
Gas stop
valve
Valve caps
Liquid stop valve
Charging
hoses
Gauge
manifold
01_EN_3P190651-2C.fm Page 5 Tuesday, March 13, 2007 4:35 PM
