Airwell Multi Split DUO 50 DCI, Service Manual

Page: 146 / 151

16-45
APPENDIX A
SM DLF 1-A.1 GB
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
PIPE 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 wrench to tighten
the nut firmly.
Connecting to the outdoor unit
1. Align the center of the pipes to the
valves.
2. Use the torque wrench to tighten
the valves firmly according to table:
Tube (Inch)/
Torque(N.m) 1/4 3/8 1/2 5/8 3/4
Flare Nuts 13-18 40-45 60-65 70-75 80-85
Valve Cap 13-20 13-20 18-25 18-25 40-50
Service Port
Cap 11-13 11-13 11-13 11-13 11-13
EVACUATION OF PIPES AND INDOOR UNIT
After connection the unions of the indoor and
outdoor units, evacuate 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 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 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.
NOTE: For additional charge of various tubing
lengths, refer to outdoor unit table.