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25
10) Braze the condenser unit discharge line copper tube to the 1/2"×3/8" copper slip
reducer and the 1/2"×3/8" copper slip reducer to the condenser unit discharge line
service valve.
11) Allow the service valves to cool, then replace the Schrader valve cores. Attach the gauge
manifold hoses.
12) 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.
13) After checking the line set for leaks, vent the nitrogen charge from the line set.
14) Evacuate the line set. Allow the vacuum pump to pull down to a 29.9" Hg vacuum.
Evacuating period depends on pump capacity.
15) After evacuation, add the appropriate amount of additional R-404A. See "II.G.4 Line Set
Size and Refrigerant Charge" for details.
Hoshizaki Technical Support is available at 1-800-233-1940 for recommendations.
16) Close both gauge manifold valves.
17) Open the icemaker service valves rst, then open the remote condenser unit service
valves.
18) Disconnect the gauge manifold hoses.
19) Replace all service valve caps and tighten.
20) Insulate all exposed tubing and ttings.
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