7
English
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.
Drain-water hole
Bottom frame
Drain plug
Hose (available commercially,
inner dia. 16mm)
Do not apply refrigeration
oil to the outer surface.
Flare nut
Apply refrigeration oil to
the inner surface of the
flare.
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
[Apply oil]
Flare nut tightening torque
Flare nut for
φ
6.4
14.2-17.2N
l
m
(144-175kgf
l
cm)
Flare nut for
φ
9.5
32.7-39.9N
l
m
(333-407kgf
l
cm)
Flare nut for
φ
12.7
49.5-60.3N
l
m
(505-615kgf
l
cm)
Valve cap tightening torque
Liquid side
3/8 inch
1/4 inch
21.6-27.4N
l
m
(220-280kgf
l
cm)
Gas side
1/2 inch
48.1-59.7N
l
m
(490-610kgf
l
cm)
21.6-27.4N
l
m
(220-280kgf
l
cm)
Service port cap tightening torque
10.8-14.7N
l
m (110-150kgf
l
cm)
