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33
Icemaker
Service Loop
Service Valves
Brazed Connections
Liquid Line (Insulated)
See "II.H.1 Line Set Size and Rack
System Requirements" for details.
Suction Line (Insulated)
See "II.H.1 Line Set Size and Rack
System Requirements" for details.
Fig. 14
Rack System-Braze Connection
8) 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 refrigerant as a mixture with pressurized air for leak
testing.
9) After checking the line set for leaks, vent the line set nitrogen charge. Next, open both
icemaker service valves and vent the icemaker nitrogen holding charge.
10) After venting the icemaker nitrogen holding charge, evacuate the icemaker and line set.
Allow the vacuum pump to pull down to a 29.9" Hg vacuum. Evacuating period depends
on pump capacity.
11) After evacuation, charge the icemaker and line set with refrigerant vapor (R-404A,
R-407A, or R-407F) to a pressure of 15to 30 PSIG.
12) Close both gauge manifold valves.
13) Open the rack system service valves.
14) Disconnect the gauge manifold hoses.
15) Replace all service valve caps and tighten.
16) Insulate all exposed tubing and ttings.
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