Airwell DLS series Installation Instructions Manual - Page 10

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PIPES CONNECTIONS

CUTTING AND FLARING THE PIPES

1. Please use the pipe cutter for cutting the pipes.

2. Remove all burrs by using reamer. Gas leakage might

happen If burrs are not removed !

Turn pipes edge down to avoid metal powder from

entering down the pipes.

3. After inserting the flare nut into the cooper pipes,

please make a flare.

PIPE INSULATION

1. Please carry out insulation at pipe connection portion as mentioned

in Indoor/ Outdoor Unit Installation Diagram. Please wrap the insulated

piping end to prevent water from going inside the piping.

2. If drain hose or connecting pipes is in the room (where dew may form).

Please increase the insulation by using POLY-E FOAM with thickness

of 9 mm or more.

PIPES CONECTIONS TO THE UNIT

Connecting to the indoor unit

1. Align the center of the pipes and finger tight

the flare nut.

2. Use the torque wranch to tighten the

nut firmely.

Connecting to the outdoor unit

1. Align the center of the pipes to the valves.

2. Use the torque wranch to tighten the valves

firmely according to table:

EVACUATION OF PIPES AND INDOOR UNIT

After connection the unions of the indoor and outdoor units,

purge the air from the tubes and from the 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 0MPa (0cm Hg) to - 0.1 MPa

(-76cm 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 approximattely 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 from both valves, and open them

using a hexagonal Allen wrench.

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.

To cut

Coppet pipe

0.0-0.5mm

Bar

Sample

damaged

Reamer

Inclined

Coppet pipe

Vinyl tape

TUBE (Inch)

Torque(N.m)

1/4

3/8

Flare Nuts

13-18

40-45

Valve Cap

13-20

Service Port Cap

11-13

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

11. Suction flare connection

12. Liquid flare connection

NOTE: For additional charge of various tubing

lengths, refer to outdoor unit table.

Surface

Uneven

thickness

Cracked

1/2

5/8

3/4

60-65

70-75

80-85

18-25

40-50

11-13