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V. Removal and Replacement of Components
IMPORTANT
Ensure all components, fasteners and thumbscrews are securely in place after
the equipment is serviced.
IMPORTANT
1. 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 filter drier every time the sealed refrigeration system is
opened.
3. Do not leave the system open for longer than 15 minutes when replacing or
servicing parts.
A. Service for Refrigerant Lines
1. Refrigerant Recovery
The icemaker unit is provided with two refrigerant access valves – one on the low-side and
one on the high-side line. 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.
2. Evacuation and Recharge [R-404A]
1) Attach charging hoses, a service manifold and a vacuum pump to the system. If possible,
use quick-release connectors on the access valves (especially the high side).
IMPORTANT
The vacuum level and vacuum pump may be the same as those for current
refrigerants. However, the rubber hose and gauge manifold to be used for
evacuation and refrigerant charge should be exclusively for POE oils.
2) Turn on the vacuum pump. Never allow the oil in the vacuum pump to flow
backward.
3) Allow the vacuum pump to pull down to a 29.9" Hg (760 mm Hg) vacuum. Evacuating
period depends on pump capacity.
4) Close the low-side valve and high-side valve on the service manifold.
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