Service Manual

25
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
NOTICE
3. Evacuation and Recharge
1) Attach a vacuum pump to the system. Be sure the charging hoses are
connected to low-side access valves.
2) Turn on the vacuum pump. Open the gauge manifold valves. Never allow the
oil in the vacuum pump to flow backwards.
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 on the gauge manifold.
5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a
refrigerant service cylinder. Remember to loosen the connection and purge the
air from the hose. See the nameplate for the required refrigerant charge.
Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which
meets ARI Standard 700 (latest edition) be used.
6) A liquid charge is required when charging an R-134a system. Place the service
cylinder on the scales; if the service cylinder is not equipped with a dip tube,
invert the service cylinder, and then place it on the scales. Open the high-side
valve on the gauge manifold.
7) Allow the system to charge with liquid until the proper charge weight is met.
8) If necessary, add any remaining charge to the system through the low-side.
9)
NOTICE! To prevent compressor damage, use a throttling valve or
liquid
dispensing device to add the remaining liquid charge through
the low-side access valve with the appliance running
.
10) Close gauge manifold valves and disconnect the hoses.
11) Cap the access valve to prevent a possible leak.