Connecting Tubing Between Indoor And Outdoor Units - Panasonic S-140MH1H5 Installation Instructions Manual

5-2. Connecting Tubing Between Indoor and Outdoor Units

(1) Tightly connect the indoor-side refrigerant tubing extended from the wall with the outdoor-side tubing.
Indoor Unit Tubing Connection
Type 140
ø15.88
Gas tube
(Flare connection)
ø9.52 (Flare connection)
Tightening torque (approximate)
Liquid tube
Thickness of connecting tube
(2) To fasten the flare nuts, apply specified torque.
•
When removing the flare nuts from the tubing connections, or when tightening them after
connecting the tubing, be sure to use 2 adjustable wrenches or spanners. (Fig. 5-6)
If the flare nuts are over-tightened, the flare may be damaged, which could result in
refrigerant leakage and cause injury or asphyxiation to room occupants.
•
For the flare nuts at tubing connections, be sure to use the flare nuts that were supplied with
the unit, or else flare nuts for R410A (type 2).
The refrigerant tubing that is used must be of the correct wall thickness as shown in the
table below.
Tube diameter
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
ø15.88 (5/8")
100 – 120 N · m {1000 – 1200 kgf · cm}
ø19.05 (3/4")
Because the pressure is approximately 1.6 times higher than conventional refrigerant pressure, the use of ordinary flare nuts (type 1) or
thin-walled tubes may result in tube rupture, injury, or asphyxiation caused by refrigerant leakage.
• In order to prevent damage to the flare caused by over-tightening of the flare nuts, use the table above as a guide when tightening.
• When tightening the flare nut on the liquid tube, use an adjustable wrench with a nominal handle length of 200 mm.
(Brazing connection)
ø12.7 (Flare connection)
Tightening torque (approximate)
: 34 ~ 42 N • m
Thickness of connecting tube
: 0.8 mm
Tightening torque (approximate)
14 – 18 N · m {140 – 180 kgf · cm}
34 – 42 N · m {340 – 420 kgf · cm}
49 – 61 N · m {490 – 610 kgf · cm}
68 – 82 N · m {680 – 820 kgf · cm}
224
ø25.4
(Brazing connection)
ø12.7 (Flare connection)
Tightening torque (approximate)
: 49 ~ 61 N • m
Thickness of connecting tube
: 0.8 mm
Tube thickness
0.8 mm
0.8 mm
0.8 mm
1.0 mm
1.0 mm
21
280
ø25.4
: 49 ~ 61 N • m
: 0.8 mm
Torque wrench
Spanner
Indoor unit
Outdoor unit
Fig. 5-6