Removal And Replacement Of Evaporator; Removal And Replacement Of Thermistor - Hoshizaki KM-1800SWH/3 Service Manual

G. Removal and Replacement of Evaporator
Always install a new drier every time the sealed refrigeration system is opened.
Do not replace the drier until after all other repairs or replacement have been
made.
1) Turn off the power supply.
) Remove the panels and the top insulation over the evaporator.
3) Recover the refrigerant and store it in an approved container.
4) Remove the spray tubes and the insulations at the "U" shaped notch where the
refrigeration tubings pass through the molded chassis.
5) Disconnect the evaporator tubing.
6) Remove the pop rivets securing the evaporator, lift out the evaporator.
7) Install the new evaporator.
8) Remove the drier, then place the new drier in position.
9) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
10) Check for leaks using nitrogen gas (140 PSIG) and soap bubbles.
11) 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 lable inside the icemaker.
1) Replace the removed parts in the reverse order of which they were removed.
13) Replace the top insulation and the panels in their correct positions.
14) Turn on the power supply.
H. Removal and Replacement of Thermistor
1. Fragile, handle very carefully.
. Always use a recommended sealant (High Thermal Conductive Type), Model
KE4560RTV manufactured by SHINETSU SILICONE, Part Code 60Y000-
11, or Part Code 4A0683-01 equivalent.
3. Always use a recommended foam insulation (Non-absorbent Type) or
equivalent.
4. Do not shorten or cut the thermistor leads when installing.
1) Turn off the power supply.
) Remove the panels.
3) Remove the control box cover.
4) Disconnect the thermistor leads from the K3 connector on the control board.
IMPORTANT
IMPORTANT
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