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Refrigerant Piping Work
1.
Installing outdoor unit
1) When installing the outdoor unit, refer to "Precautions for Selecting the Location" and the "Indoor/Outdoor Unit Installation
Drawings".
2) If drain work is necessary, follow the procedures below.
2.
Drain work
1) Use drain plug for drainage.
2) If the drain port is covered by a mounting base or floor surface, place
additional foot bases of at least 30mm in height under the outdoor
unit's feet.
3) In cold areas, do not use a drain hose with the outdoor unit.
(Otherwise, drain water may freeze, impairing heating performance.)
3.
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.
Flare nut for φ6.4
Flare nut for φ9.5
Flare nut for φ12.7
Flare nut for φ15.9
2) To prevent gas leakage, apply refrigeration machine oil on both inner and outer surfaces of the flare.
(Use refrigeration oil for R410A)
■English
Coat here with refrigeration machine oil
Flare nut tightening torque
14.2-17.2N • m
(144-175kgf • cm)
32.7-39.9N • m
(333-407kgf • cm)
49.5-60.3N • m
(505-615kgf • cm)
61.8-75.4N • m
(630-769kgf • cm)
Bottom frame
Drain plug
Hose (available commercially,
inner dia. 16mm)
Torque wrench
Spanner
Piping union
Flare nut
Valve cap tightening
Service port cap
torque
tightening torque
Liquid pipe
26.5-32.3N • m
(270-330kgf • cm)
10.8-14.7N • m
Gas pipe
(110-150kgf • cm)
48.1-59.7N • m
(490-610kgf • cm)
Drain-water hole
While pressing
6
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