Hoshizaki KM-1900SWH/3 bField Fabricated Line Set Installation, pressurized air for leak testing

d. 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.

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. 14.

3)If you lengthened the line set as outlined in "II.G.4.a)(1) Factory Line Set Modification" and it exceeds 66 feet, see "II.G.5 Refrigerant Charge (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.G.4.a) Factory Line Set Installation."

b)Field Fabricated Line Set Installation

1)Route a 5/8" OD copper tube discharge line and a 3/8" OD copper tube liquid line between the remote condenser unit and the icemaker. Leave a service loop behind the icemaker to allow the icemaker to be pulled out for service. See Fig. 12.

Note: The service loop is not considered an oil trap.

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. Do not use silver alloy or copper alloy containing arsenic.

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.

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