Airwell ONG3-17 R410A, Service Manual

Page: 112 / 127

1 0. REFRIGERANT TUBING
Connect the indoor to the outdoor unit
The indoor unit contains a small quantity of nitrogen. Do not unscrew the nuts from the unit is
supplied with sufficient refrigerant charge (R410A). Refer to outdoor unit nameplate.
Caution!
When unscrewing the
valve caps, do not stand
in front of them or the
spindles at any time, as
the system is under
pressure.
Fig.17
1 . Indoor unit
2. Liquid tube (small dia.)
3. Suction tube (large dia.)
4. Plugs
5. Flare nuts
6. Tubing between units
7. Suction tube
8. Liquid tube
9. Outdoor unit
1 0. Flare nuts
11 . Suction valve (large)
1 2. Liquid valve (small)
Fig.17
Fig.18
Fig.19
Fig. 1 8
1 .Wrench
2.Torque wrench
3.Union
Fig. 1 9
To prevent refrigerant
leakage, coat the flared
surface with refrigeration oil
Fig.20
Fig.20
1.Suction valve
2.Service port
3.Liquid valve
4.Union
Tightening torques of
unions and valve caps:
TUBE SIZE
Liquid line 1/4”
Suction line 3/8”
Suction line 1/2”
Suction line 5/8”
TORQUE
1 5-20 N.M.
30-35 N.M
50-54N.M.
75-78N.M.
1 7
Indoor unit cassette type
1
2
3
4
5
6
7
8
9
10
11
12
To prevent crushing, bend tubes using a bending tool.
NOTE: Use R410A refrigerant type copper tubing only.
1. Open the valve cover.
Use tubing diameter that corresponds to the tubing diameter of the indoor and outdoor units.
Note that the liquid and suction tubes have different diameters. (See tube size, torque
tightening table.) 2.
Place flare nuts on tube ends before preparing them with a flaring tool. Use the flare nuts
that are mounted on the supplied outdoor and indoor units. 3.
Connect the all ends of the tubing to the indoor and outdoor units. Notice the sign. All ends
should correspond one by one.
4.
Insulate each tube separately, and their unions, with at least 6 mm thick of insulation. Wrap
the refrigerant tubing, drain hose and electric cables together with a vinyl tape (UV
protected). 5.