Hoshizaki KMS-1400MLH - Manual (Page 45)

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3. Removal and Replacement of Hot Gas Valve and Liquid Line Valve
CAUTION
1. The condensing unit has 1 hot gas valve and 1 liquid line valve. Both valves
have a strainer prior to the valve body. It is advisable to change the strainer
when replacing the hot gas or liquid line valve.
. Always use a copper tube of the same diameter and length when replacing
the hot gas and liquid lines; otherwise performance may be reduced.
3. Always install a new drier every time the sealed refrigeration system is
opened. Do not replace the drier until after all other repair or replacement
has been made. Install the new drier with the arrow on the drier in the
direction of the refrigerant flow.
1) Turn off the power supply.
) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the screw and the solenoid.
5) Disconnect the valve body. Remove the strainer and check valve.
6) Place the new valve and strainer in position.
7) Remove the drier, then place the new drier in position (located in the icemaker). Install
the new drier with the arrow on the drier in the direction of the refrigerant flow.
8) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
CAUTION
Always protect the valve body by using a damp cloth to prevent the valve from
overheating. Do not braze with the valve body exceeding 50°F (11°C).
9) Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of
refrigerant to the system (if using an electronic leak detector), and then raise the
pressure using nitrogen gas (140 PSIG). DO NOT use R-404A as a mixture with
pressurized air for leak testing.
10) Evacuate the system, and charge it with refrigerant. See the nameplate on the
condensing unit for the required refrigerant charge.
11) Cut the leads of the solenoid allowing enough lead length to reconnect using closed
end connectors.
1) Connect the new solenoid leads.
13) Attach the solenoid to the valve body and secure it with a screw.
14) Replace the panels in their correct positions.
15) Turn on the power supply.