Removal And Replacement Of Headmaster (Condensing Pressure Regulator - C; Remote Air-Cooled Model Only - Hoshizaki KMD-901MWH Service Manual

H. Removal and Replacement of Headmaster (Condensing Pressure
Regulator - C.P.R.) - Remote Air-Cooled Model Only
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.
1) Turn off the power supply.
2) Remove the panels from the remote condenser unit.
3) Recover the refrigerant and store it in an approved container.
4) Before heating, break off the stub on the dome to release the dome charge.
5) Disconnect the headmaster.
6) Place the new headmaster in position.
7) Remove the drier, then place the new drier in position.
8) Braze all fittings with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
Always protect the headmaster body by using a damp cloth to prevent it from
overheating. Do not braze with the headmaster body exceeding 250°F (121°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 rating label inside the
icemaker, for the required refrigerant charge.
11) Replace the panels in their correct positions.
12) Turn on the power supply.
IMPORTANT
CAUTION
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