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5) Disconnect the vacuum pump, and attach a refrigerant service cylinder to the high-side line.
Remember to loosen the connection, and purge the air from the hose. For air-cooled and water-
cooled models, see the nameplate for the required refrigerant charge. For remote air-cooled
models, see the charge label in the machine compartment. Hoshizaki recommends only virgin
refrigerant or reclaimed refrigerant which meets ARI Standard No. 700-88 be used.
6) A liquid charge is recommended for charging an R-404A system. Invert the service
cylinder. Open the high-side, service manifold valve.
7) Allow the system to charge with liquid until the pressures balance.
8) If necessary, add any remaining charge to the system through the low-side. Use a throttling
valve or liquid dispensing device to add the remaining liquid charge through the low-side
access port with the unit running.
9) Close the two refrigerant access valves and disconnect the hoses and service manifold.
10) Cap the access valves to prevent a possible leak.
2. Brazing
DANGER
1. Refrigerant R-404A itself is not flammable at atmospheric pressure and
temperatures up to 176° F.
2. Refrigerant R-404A itself is not explosive or poisonous. However, when exposed to
high temperatures (open flames) R-404A can be decomposed to form hydrofluoric
acid and carbonyl fluoride both of which are hazardous.
3. Always recover the refrigerant and store it in an approved container. Do not
discharge the refrigerant into the atmosphere.
4. Do not use silver alloy or copper alloy containing arsenic.
5. Do not use R-404A as a mixture with pressurized air for leak testing. Refrigerant
leaks can be detected by charging the unit with a little refrigerant, raising the
pressure with nitrogen and using an electronic leak detector.
Note: All brazing-connections inside the evaporator case are clear-paint coated. Sandpaper the
brazing connections before unbrazing the components. Use a good abrasive cloth to
remove coating.