Removal And Replacement Of Compressor - Hoshizaki KM-515MAH Service Manual

B. Removal and Replacement of Compressor
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.
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.
On remote air-cooled model, disconnect the crankcase heater.
5) Remove the hold-down bolts, washers, and rubber grommets.
6) Remove the discharge and suction pipes.
7) Remove the compressor. Unpack the new compressor package.
8) Attach the rubber grommets of the prior compressor.
9) Place the compressor in position and secure it using the bolts and washers.
10) Remove the drier, then place the new drier in position.
11) Remove the plugs from the suction, discharge, and process pipes.
12) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
13) 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-404A as a mixture with
pressurized air for leak testing.
14) Evacuate the system and charge it with refrigerant. For air-cooled and water-cooled
models, see the nameplate for the required refrigerant charge. For remote air-cooled
models, see the rating label inside the icemaker.
15) Connect the terminals and replace the terminal cover in its correct position. On remote
air-cooled model, connect the crankcase heater.
16) Replace the panels in their correct positions.
17) Turn on the power supply.
IMPORTANT
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