CONNECT THE INDOOR TO THE OUTDOOR UNIT
The indoor unit contains a small quantity of Helium
.
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 for a 6 m tubing length
.
For additional charge, please 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 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 four ends of the tubing to the indoor and outdoor units
.
4
.
Insulate each tube separately, and their unions, with at least 6 mm of
insulation. Wrap the refrigerant tubing, drain hose and electric cables
together with a vinyl tape (UV protected).
REFRIGERANT TUBING
Fig. 15
1. INDOOR UNIT
2. Liquid tube (small dia.)
3. Suction tube (large dia.)
4. Plugs
5
.
Flare nuts
6. Tubing insulation
7. Suction tube
8. Liquid tube
9
.
OUTDOOR UNIT
10
.
Flare nuts
11. Suction valve (larger)
12. Liquid valve (small)
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 15
7
Tightening
torques of unions
and valve caps:
TUBE SIZE
TORQUE
Liquid line 3/8"
Suction line 1/2"
Suction line 5/8"
Suction line 3/4"
30-35 N.M.
50-54 N.M.
75-78 N.M.
80-100 N.M.
Fig
.
16
1. Wrench
2. Torque wrench
3. Union
Fig
.
18
1. Suction valve
2. Service port
3.Liquid valve
Fig
.
17
To prevent refrigerant
leakage, coat the flared
surface with
refrigeration oil
Fig 16
Fig 17
Fig 18
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 service port of the suction 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 that
the needle in the gauge moves from 0 MPa (0 cm Hg) to -0.1 MPa
(-76 cm Hg). Let the pump run for fifteen minutes.
4. Close the valves of both the low and high sides 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. Disconnect the charging hose from the vacuum pump and from 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
.
Test with electronic leak detector or with a sponge immersed in soapy
water for bubbles.
Fig
.
19
1. Charging set
2. Vacuum pump
3. OUTDOOR UNIT
4. Service valve
5
.
Cap
6
.
Suction valve
7
.
Service valve
*
8
.
Cap
9
.
Liquid valve
10
.
INDOOR UNIT
1
1. Suction flare connection
12. Liquid flare connection
*
In some models only
NOTE: For additional R-2
2
charge of
various tubing lengths, refer to
outdoor unit nameplate
.
Fig 19
