Hoshizaki KM-650MRH, KM-650MAH, KM-650MWH Removal and Replacement of Hot Gas Valve and Line Valve

F. Removal and Replacement of Hot Gas Valve and Line Valve

IMPORTANT

1.Always use a copper tube of the same diameter and length when replacing the hot gas lines; otherwise the performance may be reduced.

2.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.

3.Always replace the strainer when replacing the hot gas valve.

1)Turn off the power supply.

2)Remove the panels.

3)Recover the refrigerant and store it in an approved container.

4)Remove the screw and the solenoid.

5)Disconnect the hot gas valve or line valve. Remove the strainer.

6)Place the new valve and strainer in position.

7)Remove the drier, then place the new drier in position.

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 250°F (121°C).

9)Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.

10)Evacuate the system, and charge it with refrigerant. For air-cooled and water-cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled models, see the charge label in the machine compartment.

11)Cut the leads of the solenoid allowing enough lead length to reconnect using closed end connectors.

12)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.

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