Hoshizaki KM-650MAH - Manual (Page 16)

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e. Mark a reference line on the female coupling and the remote condenser unit or
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. 9.
3) If you lengthened the line set as outlined in "II.F.4.a)(1) Factory Line Set Modification"
and it exceeds 66 feet, see "II.F.5 Line Set Exceeding 66 Feet" for proper charging of
the unit.
(1) Factory Line Set Modification
1) Recover the line set charge through the Schrader access ports on the Parker quick
connect couplings and store it in an approved container. Do not discharge the
refrigerant into the atmosphere. Remove the extra line set length or add extra tubing.
When adding extra tubing, insulate the additional copper tubes separately. Braze the
connections.
2) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace
of refrigerant to the lines through the Schrader access ports on the Parker quick
connect couplings (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.
3) Evacuate through the Schrader access ports on the Parker quick connect couplings and
charge with R-404A refrigerant vapor to a pressure of 15 to 30 PSIG. Go to step 2 in
"II.F.4.a) Factory Line Set Installation."
b) Field Fabricated Line Set Installation
1) Route a 3/8" OD copper tube discharge line and a 1/4" OD copper tube liquid line
between the remote condenser unit and the icemaker for line length up to 66 feet.
CAUTION! Line sizes and charge must be adjusted if line length is longer than
66 feet. For details, see "II.F.5. Line Set Exceeding 66 Feet." Leave a service loop
behind the icemaker to allow the icemaker to be pulled out for service. See Fig. 7.
CAUTION
1. Ensure that there are no traps and no kinks in the line set.
2. Do not coil extra line set. Fabricate the line set to the proper length.
2) Insulate the two copper tubes separately.
3) Install Parker quick connect couplings on each end. OS-QUICK , a universal quick
connect coupling kit available as optional equipment from Hoshizaki America, is
recommended.
CAUTION! 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.
4) Allow the coupling to cool, then replace the Schrader valve core.
5) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace
of refrigerant to the lines through the Schrader access ports on the Parker quick
connect couplings (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.