Start Up - Scotsman NM1250 Service Manual

START UP

1. Remove the front, and left side service
panels.
2. Check that the styrofoam shipping blocks
under the gearmotor, on top of the ice
discharge chute, and between the gearmotor
and the right side panel have been removed.
1. Go through the prestart inspection.
2. Open the hand valve, observe that water
enters the water reservoir, fills the tube from
the reservoir to the evaporator, and then shuts
off. Check for leaks.
3. Switch the master switch on.
The electrical start up sequence is now on
automatic.
A. There should be a short (15 second) delay
before the gearmotor starts.
B. After the gearmotor starts, the compressor
will start.
4. On air cooled models, the condenser will
begin to discharge warm air, on water cooled
models, the water regulating valve will open,
and warm water will be discharged into the
drain.
5. The unit should soon be making ice, if
desired, the low side pressure can be
checked: it should be 30 psig + or - 4 psig.
The suction line temperature at the
compressor is normally very cold, nearly to the
point of frost up to the compressor body, but
not on it.
The air cooled discharge pressure will depend
upon air and water temperatures, but should
be between 200 psig and 280 psig.
Pre-Start Inspection
3. Inspect the interior of the machine for loose
screws or wires. Check that no refrigerant
lines are rubbing each other. Check that the
fan blade turns freely (air cooled).
4. Check that the unit is installed correctly
according to the final check list (page 8).
Start Up
For example, with an air cooled, single phase
unit in temperatures of 65
water, you should observe values close to
these:
Low side pressure: 27 psig.
High side pressure: 210 psig.
Gearmotor amps: 1.2
Compressor amps: 7.1
The water cooled discharge pressure should
be constant at about 220 psig.
The above numbers are for new, clean
machines, you can expect to see some values
higher, and some lower between different
units.
6. THERE ARE NO ADJUSTMENTS TO
MAKE, so replace the panels.
7. Clean and/or sanitize the storage bin
interior, wipe off the exterior with a clean,
damp cloth.
8. Give the owner/user the service manual,
instruct him/her in the operation of the unit,
and make sure they know who to call for
service.
9. Fill out the manufacturers registration card,
and mail it to the Scotsman Factory.
10. Fill out the field quality audit form, and mail
it to the Scotsman factory.
February, 1989
Page 9
NM1250
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F. air and 50 F.