6)A liquid charge is recommended when charging an
7)Allow the system to charge with liquid until the proper charge weight is met.
8)Close the
9)Cap the access valve 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.
2.When brazing, protect the drier by using a wet cloth to prevent the drier from overheating. Do not allow the drier to exceed 250°F (121°C).
Note: Hoshizaki recommends that compressor starting components be replaced at the same time as the 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.
1)Move the power switch to the "OFF" position, then unplug the unit from the electrical outlet.
2)Remove the upper and lower rear panels, front panel, and louver. See Fig. 1. Remove the screws securing the control box, then gently move the box out of the way.
3)Install a temporary
4)Remove the terminal cover on the compressor and disconnect the compressor wiring.
5)Remove the discharge and suction pipes.
6)Remove the
7)Remove the compressor.
8)Attach the rubber grommets of the prior compressor to the new compressor.
9)Place the compressor in position and secure it using the bolts and washers.
10)Replace the
11)Remove the drier, then place the new drier in position.
12)Remove the plugs from the suction, discharge, and process pipes.
13)Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
14)Use an electronic leak detector or soap bubbles to check for leaks. Add a trace of refrigerant to the system (if using an electronic leak detector), and then raise the pressure using nitrogen gas (140 PSIG). DO NOT use
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