English 8
Refrigerant piping work
1. Installing outdoor unit
1)
When installing the outdoor unit, refer to “
Precautions for Selecting the Location
” on page 3 and the “
Outdoor Unit Instal-
lation Drawings
” on page 4.
2) If drain work is necessary, follow the procedures below.
2. Drain work
• If the drain port is covered by a mounting base or floor sur-
face, place additional foot bases of at least 1-1/4 inch
(30mm) in height under the outdoor unit’s feet.
• In cold areas, do not use a drain plug, drain caps (1,2) and
a drain hose with the outdoor unit. (Otherwise, the drain
water may freeze, impairing heating performance.)
1) Attach ? drain cap (1) and ? drain cap (2).
2) Attach ? drain plug.
3. Refrigerant piping
• 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.
• Protect or enclose refrigerant tubing to avoid mechanical damage.
• 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 cap (1)
Drain cap (2)
H
Drain cap (2)
Air outlet side
B
Drain
plug
G
H
Bottom frame
Drain plug
Hose (available commercially,
inner dia. 5/8 ” (16mm))
B
Bottom frame
Drain cap
Pinch the bottom
frame in.
Torque wrench
Piping union
Flare nut
Flare nut
Spanner
Flare nut tightening torque
ø 1/4 inch (6.4mm) 10-1/2 — 12-3/4ft ● lbf (14.2-17.2N ● m)
24-1/8 — 29-1/2ft ● lbf (32.7-39.9N ● m)
36-1/2 — 44-1/2ft ● lbf (49.5-60.3N ● m)
45-5/8 — 55-5/8ft ● lbf (61.8-75.4N ● m)
ø 3/8 inch (9.5mm)
ø 1/2 inch (12.7mm)
ø 5/8 inch (15.9mm)
11/16 inch (17mm)
10-1/2 — 12-5/8ft ● lbf
(14.2-17.2N ● m)
8 — 10-7/8ft ● lbf
(10.8-14.7N ● m)
7/8 inch (22mm)
16 — 20-1/4ft ● lbf
(21.6-27.4N ● m)
1-1/16 inch (27mm)
35-3/8 — 44-1/8ft ● lbf
(48-59.8N ● m)
3/4 inch (19mm)
12-5/8 — 15-3/8ft ● lbf
(17.1-20.9N ● m)
Width across flats
Valve cap tightening
torque
Service port cap tightening torque
Do not apply refrigeration
oil to the outer surface.
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] [Tighten]
3PEN417620-3N.book Page 8 Friday, June 21, 2019 9:50 AM
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