Hoshizaki FD-1001MWH(-C) EN - Manual (Page 76)

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V. Removal and Replacement of Components
WARNING
1. This unit should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
2. Move the power switch to the "OFF" position and turn off the power supply
before servicing. Lockout/Tagout to prevent the power from being turned
back on inadvertently.
3. CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews
are securely in place after the equipment is serviced. Make sure that none
have fallen into the dispenser unit/storage bin.
4. Make sure all food zones in the icemaker and dispenser unit/storage are
clean after the unit is serviced. For cleaning procedures, see "VI. Cleaning
and Maintenance."
A. Service for Refrigerant Lines
WARNING
1. Repairs requiring the refrigeration circuit to be opened must be performed
by properly trained and EPA-certified service personnel.
2. Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.
3. 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.
CAUTION
1. Do not leave the system open for longer than 15 minutes when replacing or
servicing parts. The Polyol Ester (POE) oils used in R-404A units can absorb
moisture quickly. Therefore it is important to prevent moisture from entering
the system when replacing or servicing parts.
2. Always install a new drier every time the sealed refrigeration system is
opened.
3. 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.
4. When brazing, protect the drier by using a wet cloth to prevent the drier from
overheating. Do not allow the drier to exceed 250°F (121°C).
1. Refrigerant Recovery (except MLH model)
The icemaker unit is provided with refrigerant access valves. Using proper refrigerant
practices, recover the refrigerant from the access valves and store it in an approved
container. Do not discharge the refrigerant into the atmosphere.