Hoshizaki FD-1001MWH(-C) EN - Manual (Page 91)

91
J. Removal and Replacement of Headmaster (Condensing Pressure
Regulator - C.P.R.) - Remote Air-Cooled Model
CAUTION
1. Always install a new drier every time the sealed refrigeration system is
opened.
2. 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.
3. When brazing, protect the C.P.R. and drier by using wet cloths to prevent the
C.P.R. and drier from overheating. Do not allow the C.P.R. or drier to exceed
250°F (121°C).
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.
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.