Removal And Replacement Of Components; Service For Refrigerant Lines; [A] Refrigerant Recovery; [B] Evacuation And Recharge [R-404A] - Hoshizaki KMD-900MRH Service Manual

V. Removal and Replacement of Components
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 5 minutes when replacing or
servicing parts.

1. Service for Refrigerant Lines

[a] 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.

[b] Evacuation and Recharge [R-404A]

1) Attach charging hoses, a service manifold and a vacuum pump to the system. Be sure to
connect charging hoses to both high and low-side access valves.
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 vacuum. Evacuating period depends on
pump capacity.
4) Close the low-side valve and high-side valve on the service manifold.
IMPORTANT
IMPORTANT
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