Removal And Replacement: Evaporator - Scotsman FME2400R Service Manual

REMOVAL AND REPLACEMENT: Evaporator

Shut off the water supply before beginning.
To Replace the Evaporator:
(Assuming all the steps for removal of the thrust
bearing, breaker, auger, and water seal have been
performed.)
1. Discharge the refrigerant from the ice maker.
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. Disconnect the water inlet tube, and remove the
evaporator.
4. Unsweat the drier from the liquid line.
Repeat the above, as required, for each system.
RECEIVER
Disconnect electrical
power before
beginning.
FRONT SEATED KING VALVE
SERVICE PORT
March 1995
Page 31
NME1850R & FME2400R
5. After installing a new water seal in the new
evaporator ( see "To Replace the Water Seal")
resweat the tubing 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 gear motor 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.
Head Pressure Control Valve
1. Purge system of refrigerant
2. Break off process tube on the top of the OLD
head pressure control valve.
3. Unsweat old valve from tubing.
4. Unsweat old dryer from tubing.
5. Install new valve in place, check for correct
connections and be sure the number on the side
of the valve is "180"
6. Wrap the new valve body in wet cloths to heat
sink the valve body.
7. Sweat in the new valve and the new dryer.
8. Evacuate the system, and weigh the nameplate
charge into the receiver.
Charging
Extra care must be taken when
CHARGING
recharging this remote system. No
CYLINDER
liquid refrigerant may be placed in
the system at the compressor. DO
NOT use the access valves at the
front of the unit for weighing in the
charge. All liquid R-404A must be
weighed into the receiver through the
"front seated" king valve.
Procedures