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C. Removal and Replacement of Evaporator
See Fig. 4.
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) Move the power switch to the "OFF" position, then unplug the unit.
2) Recover the refrigerant and store it in an approved container. See "V.A. Service for
Refrigerant Lines."
3) Remove the evaporator fan shroud. Remove the cabinet thermistor from the evaporator
fan shroud.
4) Note the location of the defrost thermistor, then remove the defrost thermistor.
5) Disconnect the evaporator fan motor ground wire, then remove the evaporator shroud
and evaporator drain bracket.
6) On freezers, remove the defrost heater.
7) Remove the 4 refrigeration circuit mounting screws and lift the refrigeration circuit to
access the evaporator refrigeration connections.
8) Remove the insulation, then disconnect the evaporator tubing.
9) Remove the front 2 evaporator mounting screws and slide the evaporator out.
10) Remove the evaporator brackets and secure them to the new evaporator.
11) Place the new evaporator into the evaporator mounting brackets and secure.
12) Remove the drier, then place the new drier in position.
13) Braze all fittings while purging with nitrogen gas flowing at a pressure of 3 to 4 PSIG.
See "V.A.2. Brazing."
14) 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 or R-134a as a mixture
with pressurized air for leak testing.
15) Lower the refrigeration circuit and secure with the 4 mounting screws.
16) Evacuate the system, and charge it with refrigerant. See "V.A.3. Evacuation and
Recharge." See the nameplate for the required refrigerant and refrigerant charge.
17) Replace the removed parts in the reverse order of which they were removed. Confirm
the location of the defrost thermistor. WARNING! To reduce the risk of electric shock
be sure to reconnect the evaporator fan motor ground wire. On freezers, make
sure the defrost thermistor wire is not touching the defrost heater.
18) Plug the unit back in. Move the power switch to the "ON" position.
CAUTION
37
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