Refrigerant Tubing - Electra WNG 25 DCI INV Service Manual

6

REFRIGERANT TUBING

CONNECT THE INDOOR TO THE OUTDOOR UNIT
T he indoor unit contains a small quantity of nitrogen. Do
not unscrew the nuts from the unit until you are ready to
connect the tubing. T he outdoor unit is supplied with
sufficient refrigerant charge (R410A ). Refer to outdoor unit
nameplate.
To prevent crushing, bend tubes using a bending tool.
NOTE: U se refrigeration R410A
1. O pen the valve cover.
2. U se 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.)
3. Place flares nuts on tube ends before preparing them
with a flaring tool. U se the flare nuts that are mounted
on the supplied outdoor and indoor units.
4. Connect the all ends of the tubing to the indoor and
outdoor units. Notice the sign. A ll ends should
correspond one by one.
5. 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 (U V protected).
1
2
3
4
5
6
7
8
9
10
11
12
Fig 18
type copper tubing only.
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.18
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
10.Flare nuts
11.Suction valve (larger)
12.Liquid valve (small)
TU BE SIZE
Tightening
Liquid line 1/4"
torques of unions
Suction line 3/8"
and valve caps:
Suction line 1/2"
Suction line 5/8"
Fig 19
1
2
3
Fig.19 Fig.20
1.Wrench To prevent refrigerant
2.Torque wrench leakage, coat the flared
3 Union . surface with
refrigeration oil
EVACUATION OF THE REFRIGERATION TUBES AND THE
INDOOR UNIT
A fter 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 side
of the charging set and the service port of the suction valve.
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, turn off the
high side switch and make sure that the needle in the gauge
moves from 0 MPa (0cm Hg) to -0.1 MPa (-76cm Hg). Let
the pump run for fifteen minutes.
4. Close the valve of the low side of the charging set and turn
off the vacuum pump. Note that the needle in the gauge
should not move after approximately five minutes.
5. Not any problem for five minutes, turn on the power switch of
the vacuum pump and open the valve of the low side of the
charging set.
6. Disconnect the charging hose from the vacuum pump and
from the service ports of the suction valve.
7. Tighten the service port caps of suction valve.
8. Redo 1 to 7 for other indoor units.
9. Remove the valve caps from all valves, and open them
using a hexagonal A llen wrench.
10. Remount valve caps onto all of the valves.
11. Check for gas leaks from all the connecting position. Test
with electronic leak detector or with a sponge immersed for
soapy water for bubbles.
Fig 22
Fig.22 5. Cap
1. Charging set 6. Suction valve
2. Vacuum pump 7. Service valve*
3. OUTDOOR UNIT
8. Cap
4. Service valve
APPENDIX A
TO RQU E
15-20 N.M.
30-35 N.M.
50-54 N.M.
75-78 N.M.
Fig 20
Fig 21
1
2
3
Fig.21
1.Suction valve
2.Service port
3.Liquid valve
NO TE
For additional
charge of various
tubing lengths,
refer to outdoor
unit nameplate.
9. Liquid valve
10. INDOOR UNIT
11. Suction flare connection
12. Liquid flare connection
*In some models only