Refrigeration Circuit And Component Service Information; Refrigeration Circuit Service Information - Hoshizaki KM-230BAJ Service Manual

IV. Refrigeration Circuit and Component Service Information
• This appliance should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
• To reduce the risk of electric shock, do not touch the control switch or plug with
damp hands. Make sure the control switch is in the "OFF" position before plugging
in or unplugging the appliance.
• Move the control switch to the "OFF" position and unplug the appliance from the
electrical outlet before servicing.
• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after any maintenance is done to the appliance. Make sure that
none have fallen into the storage bin.
• Make sure all food zones in the icemaker and storage bin are clean after service.
A. Refrigeration Circuit Service Information
• Repairs requiring the refrigeration circuit to be opened must be performed by
properly trained and EPA-certified service personnel.
• 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.
• Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.
• Do not leave the system open for longer than 15 min. when replacing or servicing
parts. The Polyol Ester (POE) oils used in R-404A applications can absorb
moisture quickly. Therefore it is important to prevent moisture from entering the
system when replacing or servicing parts.
• 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.
• 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).
WARNING
WARNING
NOTICE
40