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• Before brazing, remove the Schrader valve cores from the service valve access
ports.
• When brazing, protect the service valve by using a wet cloth to prevent the service
valve from overheating.
• Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4
PSIG.
4) Braze the liquid line copper tube to the straight copper tube and the straight copper tube
to the icemaker liquid line service valve.
5) Braze the icemaker discharge line copper tube to the icemaker discharge line service
valve.
6) Remove the Schrader valves from the condenser unit service valves. Next, remove the
straight copper tube from the accessory bag and place it in the condenser unit liquid line
service valve. See Fig. 10. Next, place the liquid line copper tube into the straight copper
tube.
7) Braze the liquid line copper tube to the straight copper tube and the straight copper
tube to the condenser unit liquid line service valve.
8) Braze the condenser unit discharge line to the condenser unit discharge line service
valve.
9) Allow the service valves to cool, then replace the Schrader valve cores. Attach the
gauge manifold hoses.
10) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the line set tubing through the service valve access ports (if using an
electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG).
WARNING! Do not use R-404A as a mixture with pressurized air for leak testing.
11) After checking the line set for leaks, vent the nitrogen charge from the line set.
12) Evacuate the line set. Allow the vacuum pump to pull down to a 29.9" Hg vacuum.
Evacuating period depends on pump capacity.
13) After evacuation, charge each line set tube with R-404A vapor to a pressure of 15 to 30
PSIG.
14) Close both gauge manifold valves.
15) Open the icemaker service valves first, then open the remote condenser unit service
valves.
16) Disconnect the gauge manifold hoses.
17) Replace all service valve caps and tighten.
18) Insulate all exposed tubing and fittings.
NOTICE
26
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