Pipes Connections; Cutting And Flaring; Evacuation Of Pipes And Indoor Unit - Electra DNG 18 Service Manual

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 13-20
Service Port Cap 11-13 11-13
1
2
4
5
6
7
8
3
9
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.
APPENDIX A
Surface Uneven
thickness
Cracked
1/2 5/8 3/4
60-65 70-75 80-85
18-25 18-25 40-50
11-13 11-13 11-13
10
11 12
9