Hoshizaki KM-250BWF - Manual (Page 34)

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3. Removal and Replacement of Compressor
IMPORTANT
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.
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, and unplug the icemaker.
2) 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.
5) Remove the discharge and suction pipes using brazing equipment.
6) Remove the hold-down bolts, washers and rubber grommets.
7) Slide and remove the compressor. Unpack the new compressor package. Install the
new compressor.
8) Attach the rubber grommets of the prior compressor.
9) Sandpaper the suction, discharge and process pipes.
10) Place the compressor in position, and secure it using the bolts and washers.
11) Remove plugs from the suction, discharge and process pipes.
12) Braze the process, suction and discharge lines (Do not change this order), while
purging with nitrogen gas flowing at the pressure 3-4 PSIG.
13) Install the new filter drier.
14) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.