Removal And Replacement Of Compressor - Hoshizaki Commercial Series Service Manual

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B. Removal and Replacement of Compressor
1. Always install a new drier every time the sealed refrigeration system is
opened.
2. 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 flow.
3. 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: When replacing a compressor it is recommended to install a new start relay, start
capacitor, and external compressor overload (refrigerator). 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.
2) Recover the refrigerant and store it in an approved container. See "V.A. Service for
Refrigerant Lines."
3) Remove the compressor terminal cover and disconnect the wires from the compressor.
4) Remove the discharge, suction, and process pipes.
5) Remove the hold-down screws, clips, and rubber grommets.
6) Remove the compressor.
7) Attach the rubber grommets to the new compressor.
8) Place the new compressor in position and secure it using the screws and clips.
9) Remove the drier, then place the new drier in position.
10) Remove plugs from the suction, discharge, and process pipes.
11) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
See "V.A.2. Brazing."
12) 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 R-134a or R-404A as a mixture
with pressurized air for leak testing.
13) Evacuate the system, and charge it with the correct refrigerant. See "V.A.3. Evacuation
and Recharge." See the nameplate for the required refrigerant and refrigerant charge.
14) Install the new start relay, start capacitor, and external compressor overload
(refrigerator), then reconnect the compressor wires in their correct positions.
WARNING! To reduce the risk of electric shock, be sure to reconnect the
compressor ground wire.
15) Plug the unit back in. Move the power switch to the "ON" position.
CAUTION
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