Refrigerant Tubing; Connect The Indoor To The Outdoor Unit; Evacuation Of The Refrigeration Tubes And The Indoor Unit - Electra WNG 7 Service Manual

7

REFRIGERANT TUBING

CONNECT THE INDOOR TO THE OUTDOOR UNIT

The indoor unit contains a small quantity of refrigerant. Do not
unscrew the nuts from the unit until you are ready to connect the
tubing. The outdoor unit is supplied with sufficient refrigerant charge.
Refer to outdoor unit nameplate.
To prevent crushing, bend tubes using a bending tool.
NOTE: Use refrigeration type copper tubing only.
1. 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 tu be 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 four ends of the tubing to the indoor and outdoor
units.
4. Insulate each tube separately, and their unions, with at least
6mm. of insulation. Wrap the refrigerant tubing, drain hose and
electric cables together with a vinyl tape (UV protected).
1
2
3
4
5
6
7
8
9
10
11
12
Fig 21
Tightening
torques of unions
and valve caps:
Fig.22
1.Wrench
2.Torque wrench
3.Union
EVACUATION OF THE REFRIGERATION TUBES AND
THE INDOOR UNIT
After connecting the unions of the indoor and outdoor units, purge
the air from the tubes and indoor unit as follows:
1. Connect the charging hoses with a push pin to the low and high
sides of the charging set and the serice port o f the suc tion and
liquid valves. Be sure to connect the end of the charging hose
with the push pin to the service port.
2. Connect the center hose of the charging set to a vacuum pump.
3. Turn on the power switch of the vacuum pump and make sure
Caution!
that the needle in the gauge moves from 0MPa(0cm Hg)to -0.1MPa
When unscrewing the
(-76cm Hg). Let the pump run for fifteen minutes.
valve caps, do not
4. Close the valves of both the low and high sides of the charging
stand in front of them
set and turn off the vacuum pump. Note that the needle in the
or the spindles at any
gauge should not move after approximately five minutes.
time, as the system is
5. Disconnect the charging hose from the vacuum pump and from
under pressure.
the service ports of the suction and liquid valves.
6. Tighten the service port caps of both suction and liquid valves.
7. Remove the valve caps from both valves, and open them using a
hexagonal Allen wrench.
8. Remount valve caps onto both of the valves.
9. Check for gas leaks from the four unions and from the valve caps.
Text with electronic leak detector or with a sponge immersed in
soapy water for bubbles.
Fig.21
1.INDOOR UNIT
2.Liquid tube (small dia.)
3.Suction tube (large dia.)
4.Plugs
5.Flare nuts
6.Tubing between units
Fig 4a
7.Suction tube
Fig.24a
8.Liquid tube
1.Charging set
9.OUTDOOR UNIT
2.Vacuum pump
10.Flare nuts
3.OUTDOOR UNIT
11.Suction valve (larger)
4.Service valve
12.Liquid valve (small)
CONTENT
TUBE SIZE
Liquid line 1/4"
Suction line 3/8"
Suction line 1/2"
Suction line 5/8"
Fig.23
Fig.22
1
2
3
Fig.23
To prevent refrigerant
leakage, coat the flared
surface with
refrigeration oil
1
2 3
4
5
6 7
8
9
For additional charge of various
tubing lengths, refer to outdoor
unit nameplate.
2
5.Cap
6.Suction valve
7. Service valve*
8.Cap
TORQUE
15-20 N.M.
30-35 N.M.
50-54 N.M.
75-78 N.M.
Fig.24
1
2
3
Fig.24
1.Suction valve
2.Service port
3.Liquid valve
10
11
12
NOTE
9.Liquid valve
10.INDOOR UNIT
11.Suction flare connection
12.Liquid flare connection
*In some models only