Hoshizaki AMERICA 73183 - Manual (Page 41)

41
IV. Replacement of Components
WARNING
• 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.
A. Service for Refrigerant Lines
WARNING
• 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.
• 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 or R-404A as a
mixture with pressurized air for leak testing.
NOTICE
• 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 and R-404A 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).
1. Refrigerant Recovery
The appliance 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.