Hoshizaki KM-901MWH - Manual (Page 74)

74
F. Removal and Replacement of Air-Cooled Condenser
CAUTION
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).
1) Turn off the power supply.
2) Remove the panels.
3) Recover the refrigerant and store it in an approved container.
4) Disconnect the fan motor wiring harness. Remove the bolts securing the fan motor
assembly to the floor of the machine, then remove the assembly.
5) Disconnect the condenser inlet and outlet piping.
6) Remove the screws securing the condenser assembly, then remove the assembly.
7) Remove the shroud from the old condenser and attach it to the new condenser.
8) Install the new condenser.
9) Remove the drier, then place the new drier in position.
10) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
11) 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.
12) Evacuate the system, and charge it with refrigerant. See the nameplate for the required
refrigerant charge.
13) Replace the removed parts in the reverse order of which they were removed.
14) Replace the panels in their correct positions.
15) Turn on the power supply.