[D] Evacuation And Recharge - Hoshizaki KM-40C-HC Service Manual

When removing the refrigerant from the unit, be sure the surrounding area is well-
ventilated and free from open flames. Discharge refrigerant in small amounts into the
atmosphere. If the surrounding area is not well-ventilated and exposed to open flames,
recover the refrigerant in a refrigerant recovery cylinder and discharge it in small
amounts into the atmosphere outdoors.

[d] EVACUATION AND RECHARGE

1) Attach charging hoses, service manifold and vacuum pump to the low-side and high-
side (to be fitted by service engineer) access valves.
2) Turn on the vacuum pump.
3) Allow the vacuum pump to pull down to a 760 mmHg vacuum. Evacuating period
depends on the pump capacity.
4) Close the low-side and high-side valves on the service manifold.
5) Disconnect the vacuum pump, and attach a refrigerant charging cylinder to
accurately weigh in the liquid charge. Remember to purge any air from the charging
hose. See the nameplate for the required refrigerant charge.
6) Open the high-side valve on the gauge manifold, and accurately measure in the
liquid charge. Close the valve on the charging cylinder before closing the high-side
manifold valve. Any remaining liquid in the line can be charged into the low side.
7) Do not charge more than 150 g of R290.
8) Turn on the icemaker. Release the high-side access connector, and allow pressure
in the charging line to slowly enter the low side of the system. Cap off the high-
side access valve. When pressure reduces on the low side, disconnect the low side
charging line and cap off the access valve.
9) Always cap the access valves to prevent a refrigerant leak.
10) Always thoroughly leak test all joints and valve caps.
11) Avoid charging large quantities of liquid into the low side in case of damage to the
compressor.
Cap
Access Valve
55
Depressed
OPEN