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4) Close the low-side valve and high-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. Hoshizaki recommends only virgin refrigerant or reclaimed refrigerant which
meets ARI Standard 700 (latest edition) be used.
6) A liquid charge is recommended for charging an R-404A system. Invert the service
cylinder and place it on scales. Open the high-side valve on the gauge manifold.
7) Allow the system to charge with liquid until a charge weight equal to the charge weight
removed earlier in step "4.a)5)" is met.
8) Remove the magnets from the liquid and suction line valves.
9) Close the gauge manifold valves.
10) Open the rack system liquid and suction line service valves.
11) Turn on the power supply.
1) Allow the system to run, then conrm the EPR (evaporator pressure regulator) setting.
EPR Setting: 3 PSIG for evaporator temperature no less than 5°F (-15°C).
13) Disconnect the gauge manifold hoses.
14) Cap the access valves to prevent a possible leak.
B. Removal and Replacement of Compressor
CAUTION
1. Always install a new drier every time the sealed refrigeration system is
opened.
. Do not replace the drier until after all other repair or replacement has been
made. Install the new drier with the arrow on the drier in the direction of the
refrigerant ow.
3. When brazing, protect the drier by using a wet cloth to prevent the drier from
overheating. Do not allow the drier to exceed 50°F (11°C).
Note: When replacing a compressor with a defective winding, be sure to install the
new start capacitor and start relay supplied with the replacement compressor.
Due to the ability of the POE oil in the compressor to absorb moisture quickly,
the compressor must not be opened more than 15 minutes for replacement or
service. Do not mix lubricants of different compressors even if both are charged
with R-404A, except when they use the same lubricant.
1) Turn off the power supply.
) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Remove the terminal cover on the compressor, and disconnect the compressor wiring.
On remote air-cooled models, disconnect the crankcase heater.
5) Remove the drier and the discharge, suction, and process pipes.