Scotsman ND550 - Manual (Page 31)

REMOVAL AND REPLACEMENT
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. 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 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.
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.
For Access to the Evaporator
to Gearmotor bolts:
1. Remove upper front and top
panels.
2. Remove screws holding
control box assembly to the
cabinet, move the control box out
of the way, temporarily secure to
cabinet.
3. Remove the upper half of the
ice chute.
4. Remove the ice sweep.
5. Loosen clamp under ice chute,
and remove the lower half of the
ice chute.
6. Remove the 2 screws securing
the front portion of the gearmotor
support to the cabinet
7. Move the the gearmotor -
evaporator to the right: space is
now available for removal of the
evaporator and gearmotor bolts.
When reassembling, reverse the
above steps. MOVE THE
GEARMOTOR -
EVAPORATOR
SCREWS
CONTROL
BOX
ND550
December, 1988
Page 31