To Replace the Evaporator:
(Assuming all the steps for removal of the
thrust bearing, breaker, auger, and water seal
have been performed.)
1. Shut the hand valves in the liquid and
suction lines to the evaporator being serviced;
then discharge the refrigerant.
2. Unsweat the refrigerant connections:
a) At the thermostatic expansion valve outlet.
//////////////////////////////CAUTION///////////////////////////
Heat sink the TXV body when unsweating
or resweating the adjacent tubing.
//////////////////////////////////////////////////////////////////////////
b) At the suction line
at the joint about 3"
from the evaporator.
3. Remove the
evaporator.
4. Unsweat the drier
from the liquid line.
5. After installing a
new water seal in the
new evaporator (see
"To Replace the Water
Seal") sweat in the
new evaporator at the
old connections.
6. Install an new drier
in the liquid line.
7. Evacuate the
system until
dehydrated, then
weigh in the
nameplate charge.
Check for leaks.
8. Install auger,
breaker, breaker
bearing assembly, and
ice discharge chute in
reverse order of
disassembly. See "To
Reassemble
Evaporator and Auger"
To Reassemble the Evaporator and Auger
1. After the gearmotor has been inspected,
fasten the evaporator to the gear motor, be
sure that the number of shims indicated on the
gear case cover is in place between the
gearcase cover and the drip pan gasket.
Torque the bolts to 110 inch pounds.
2. Lower the auger into the evaporator barrel,
slightly turning it to match up with the drive
end. Do Not Drop Into the Evaporator.
3. Complete the reassembly by reversing the
disassembly for the breaker & thrust bearing
assembly.
ICE SWEEP
BEARING
AUGER
EVAPORATOR
DRIP PAN
DIVDER/BREAKER
REMOVAL AND REPLACEMENT: Evaporator
NM1850RH
May, 1989
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