Replacement Of Components; Service For Refrigerant Lines - Hoshizaki BB59 Service Manual

IV. Replace of Components
• The appliance should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
• Move the power switch to the "OFF" position then unplug the appliance from the
electrical outlet before servicing.
• Make sure all food zones in the appliance are clean after the appliance is serviced
• For R290 Models use the OEM parts.
A. Service for Refrigerant Lines
• Repairs requiring the refrigeration circuit to be opened must be performed by
properly trained and EPA-certified service personnel.
• Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.
• The gas R290 is not necessary recover; can be in a well ventilated area with no
source of ignition.
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-134a a mixture with
pressurized air for leak testing.
• Do not leave the system open for longer than 15-min. when replacing or
servicing parts. The Polyol Ester (POE) oils used in R-134a, R-404A or R290 ,
appliances 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
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