Hoshizaki F-801MAJ-C Instruction Manual page 35

3) Install Parker quick connect couplings on the icemaker end of the line set. OS-QUICK,
a universal quick connect coupling kit, is required. NOTICE! Before brazing, remove
the Schrader valve core from the access port. When brazing, protect the coupling
by using a wet cloth to prevent the coupling from overheating. Do not use silver
alloy or copper alloy containing arsenic. Braze all fittings while purging with
nitrogen gas flowing at a pressure of 3 to 4 PSIG.
4) Allow the Parker quick connect couplings to cool, then connect the couplings to the
icemaker (a small amount of nitrogen is released from the icemaker at this time). Do not
replace the Schrader valve cores at this time.
Make a proper Parker quick connect coupling connection as follows:
a. Remove the protective covers from the male fitting and female coupling.
b. Apply Polyol Ester (POE) refrigerant oil or Parker Super O Lube to the entire male
fitting, including O-ring, diaphragm, and threads, before making the connection.
See Fig. 16. NOTICE! Do not use thread sealant on the fittings. Use POE
refrigerant oil or Parker Super O Lube only. Couplings are one-time use only.
c. Make sure the male fitting and female coupling are properly aligned, then start the
connection by hand to ensure that it is not cross threaded.
d. Place a backup wrench on the back of the female coupling, then tighten the
connection with a wrench until it is tight. At this point, the nut has covered most of
the threads on the male fitting. NOTICE! Failure to use a backup wrench may
result in damage to the line set and possible refrigerant leaks.
e. Mark a reference line on the female coupling and the icemaker panel. Using a
backup wrench on the back of the female coupling, tighten the six-sided nut of the
female coupling an additional 1/6 turn. See Fig. 17.
5) Replace the Parker quick connect coupling Schrader valve cores.
6) Connect the rack system end of the line set per the rack system instructions. NOTICE!
Do not open the rack system service valves at this time.
7) Use an electronic leak detector or soap bubbles to check for line set connection leaks.
Place refrigerant gauges on the line set Parker quick connect coupling Schrader access
ports, then add a trace of refrigerant to the line set (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. NOTICE! Confirm
connections are free of leaks.
8) After checking the line set for leaks, move the refrigerant gauges to the Schrader access
ports inside the icemaker. Vent the icemaker nitrogen holding charge. After venting the
nitrogen, evacuate the icemaker and line set.
9) After evacuation, charge the icemaker and line set with refrigerant vapor (R-404A,
R-407A, or R-407F) to a pressure of 15 to 30 PSIG.
10) Open the rack system service valves.
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