[C] Evacuation And Recharge - Hoshizaki DIM-40DE-HC Service Manual

[d] EVACUATION AND RECHARGE
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 on the
high side).
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.
Note: Always charge in the liquid stage, as many refrigerants are blends and vapor
charging will affect the blend consistency.
7) Do not charge more than 150g of R290.
8) Turn on the ice dispenser. 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
Fig. 8
56
Depressed
OPEN