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V. Removal and Replacement of Components
IMPORTANT
1.Ensure all components, fasteners, and thumbscrews are securely in place
after the equipment is serviced.
. 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.
3. 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.
4. Do not leave the system open for longer than 15 minutes when replacing or
servicing parts.
A. Service for Refrigerant Lines
WARNING
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.
IMPORTANT
1. The condensing unit is provided with two shutoff valves, one on the low-side,
one on the high-side and also with an access valve on the receiver tank. The
icemaker unit is provided with two service valves, one on the low-side and
one on the high-side.
. For refrigerant recovery, evacuation and recharge of the system, always use
the access valve on the receiver tank for the high-side and either the shutoff
valve of the condensing unit or the service valve of the icemaker unit for the
low-side line.
1. Refrigerant Recovery
Using proper refrigerant practices, recover the refrigerant and store it in an approved
container. Do not discharge the refrigerant into the atmosphere.