DUCTED REVERSE CYCLE REFRIGERATED AIR CONDITIONING
Page 18
Unit Installation
Pipe Welding
Take care when using brazing flame torch, ensure that hot pipes or flame do
not cause a fire
1. Use quality brazing rod suitable for copper to copper joins on refrigeration grade tubing.
2. Before brazing wrap a wet cloth around pipes next to the indoor unit to prevent hot pipes
from melting foam insulation in the unit. Make sure the flame or heat from the flame does
not contact the unit casing or wiring, or damage will occur
3. Heat the pipe up as per the
illustration
4. Use nitrogen gas for flowing
though piping during pipe
brazing. If oxygen, acetylene or
fluorocarbon gas is used, it will
cause an explosion or poisonous
gas.
5. Use a regulator valve when
nitrogen gas flowing is performed
during brazing. The gas pressure
should be maintained within 0.03
to 0.05Mpa. If an excessively
high pressure is used, it will
cause an explosion.
Connecting the tubes
1. Connect and tighten the flare nuts to the
refrigeration valves on the outdoor unit and
to the male connectors of the indoor unit.
2. Coat the flared surfaces lightly with
refrigeration oil to improve sealing.
Note: First manually tighten the flare nuts,
and then use a wrench. See table for
tightening torque values.
3. Check for leaks. Use leak detect solution or
soap solution for leak testing. An electronic
leak detector is recommended.
Tube (Inches)
Flare Sizes
9.58mm (⅜”)
15.88mm (⅝”) 19.05mm (¾”)
Torque (N.M.) 40-45 70-75 80-85
To Next Page
Loading...
