Scotsman MF 88, Руководство по обслуживанию

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Page 12
Page 12
The procedures provided in this Section are
arranged in alphabetical order, to make specific
Adjustment and Removal and replacement
information easy to locate.
Read the instructions throughly before performing
any Adjustment or Removal and Replacement
Procedures.
1
. ADJUSTMENT OF THE BIN
THERMOSTAT CONTROL
The control for the Bin Thermostat is the Tempe-
rature Control, located in the Control Box
Assembly.
WARNING - The adjusting screws on the
Temperature Control device have very
sensitive response to adjustment.
Over-adjusting or erratic guessing, can
foul the instrument and cause ultimate
delay and part replacement, WHICH
COULD HAVE BEEN PREVENTED.
Factory settings is +1,5
°
C cut-out and +4
°
C
cut-in.
2. ADJUSTMENT OF THE WATER LEVEL
INTO THE FREEZER CHAMBER
The correct Water Level in the Freezer Chamber
is about 2 cm (3/4 inch) below the ice discharge
opening. Low Water Level causes excessive
strain inside the Freezer Assembly due to a
faster freezing rate. When the Water Level is
above or below the correct level adjustment can
be performed to RAISE or LOWER the Water
Level by raising or lowering the Water Reservoir
and its Mounting Brackets.
A. To RAISE the Water Level: loosen and
remove the two screws which attach the Mounting
Bracket of the Water Reservoir to the frame and
raise the Water Reservoir Assembly of the desired
amount; then thread the screws in the
corresponding holes and tighten.
B. To LOWER the water Level: loosen and
remove the two screws which attach the Mounting
Bracket of the Water Reservoir to the frame and
lower the Water Reservoir Assembly of the
desired amount; then thread the screws in the
corresponding holes and tighten.
WARNING. - Be sure the electrical power
supply and the water supply are OFF,
before starting any of the following
REMOVAL AND REPLACEMENT
procedures, as a precaution to prevent
possible personal injury or damage to
equipment.
SECTION IV
ADJUSTMENT AND REMOVAL AND REPLACEMENT PROCEDURES
3. ADJUSTMENT OF THE
EXPANSION VALVE
This valve may be manually regulated by means
of the adjusting stem.
Turning the adjustment to the left counter-
clockwise, will increase the rate of refrigerant flow.
Turning the adjustment to the right (clockwise),
the refrigerant flow to the evaporator is reduced.
Use hex head wrench for manual adjusting
operations.
NOTE .
A. These are general steps to be followed
at first, when removing any part of any
refrigeration system, which are in summary.
a) Store the refrigerant charge in
compressor crankcase.
b) Remove all refrigerant from part to be
opened.
c) Balance pressures in parts just
evacuated.
d) Isolate parts to be opened from the rest
of the system.
e) Clean and dry joints to be broken.
f) All refrigerant openings should be
immediately plugged as soon as they are
opened.
g) Upon reassembling, it is necessary to
remove all the air moisture from the lines and
whatever part that has been open to.
4. REMOVAL OF EXPANSION VALVE
A. To remove the expansion valve:
1. Remove screws and service panels.
2. Close service valves on liquid line.
3. Run the compressor for a moment until
the evaporator coil has no liquid refrigerant in it.
4. With the compressor idling, equilize the
pressure by cracking the liquid line service valve.
5. Turn the suction service valve stem all
the way in.
6. Dry and clean the expansion valve
accurately.
7. Remove the liquid line and unbolt the
valve.
8. Seal refrigerant openings immediately.
B. To replace the expansion valve reverse
the removal procedures.