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Refrigerant Piping Work
1.
Installing outdoor unit
1) When installing the outdoor unit, refer to "Precautions for Selecting the Location" on page 2 and the "Indoor/Outdoor Unit
Installation Drawings" on page 3.
2) If drain work is necessary, follow the procedures below.
2.
Drain work
1) Use the 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
CAUTION
• Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32.)
• Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
• Do not reuse joints which have been used once already.
• Installation shall be done by an installer, the choice of materials and installation shall comply with the applicable legislation. In
Europe the EN378 is the applicable standard that shall be used.
• Ensure that the field piping and connections are not subjected to stress.
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.
Flare nut for φ6.4
Flare nut for φ9.5
Flare nut for φ12.7
English
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.
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)
[Apply oil]
Apply refrigeration oil to
the inner surface of the
flare.
Valve cap tightening torque
Gas side
3/8 inch
1/2 inch
21.6-27.4N m
48.1-59.7N m
(220-280kgf cm)
(490-610kgf cm)
Service port cap tightening torque
10.8-14.7N m (110-150kgf cm)
Drain-water hole
Bottom frame
Drain plug
Hose (available commercially,
inner dia. 16mm)
Liquid side
1/4 inch
21.6-27.4N m
(220-280kgf cm)
7
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