Removal And Replacement Of Components; Service For Refrigerant Lines; [A] Refrigerant Recovery; [B] Evacuation And Recharge - Hoshizaki KM-280MAF-E 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 15 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. Use proper refrigerant practices to 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. If
possible, use quick release connectors onto the Access Valves (especially the
High- side).
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 back-
ward.
3) Allow the Vacuum Pump to pull down to a 29.9" Hg (760 mm. Hg) vacuum. Evacu-
ating period depends on pump capacity.
4) Close the Low-side Valve and High-side Valve on the Service Manifold.
5) Disconnect the Vacuum Pump, and attach a Refrigerant Charging Cylinder to accu-
rately weigh in the liquid charge. Remember to purge any air from the charging
Hose. See the Nameplate for the required refrigerant charge. Hoshizaki
IMPORTANT
IMPORTANT
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