Hoshizaki KM-280MAH-E, Service Manual

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13) Replace the panels in their correct positions.
14) Plug in the icemaker. Turn on the power supply.
G. Removal and Replacement of Evaporator
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.
1) Turn off the power supply. Unplug the icemaker.
2) Remove the panels and the top and front insulation from the evaporator.
3) Recover the refrigerant and store it in an approved container. (See “V.A.1. Refrigerant
Recovery”.)
4) Remove the spray tubes and the insulations at the “U” shaped notch where the
refrigeration tubings go through the chassis.
5) Remove the insulation tube and disconnect the evaporator inlet tubing at the tee next to
the expansion valve using brazing equipment. (Protect the valve from excessive heat.)
6) Lift up the evaporator, and disconnect the evaporator outlet tubing.
7) Install the new evaporator, with nitrogen gas flowing at a pressure of 3 to 4 psig (.21 to
.28 bar).
8) Install the new drier.
9) Check for leaks using nitrogen gas at 140 psig (9.65 bar) and soap bubbles.
10) Evacuate the system, and charge it with refrigerant. See the nameplate for the required
refrigerant charge. (See “V.A.2. Evacuation and Recharge [R-404A]”.)
11) Replace the removed parts in the reverse order of which they were removed.
12) Replace the top and front insulation and the panels in their correct positions.
13) Plug in the icemaker. Turn on the power supply.