S1800 Marine Model Ice Machines – Service Manual - Manitowoc Ice

Refrigeration System Section 7
3. Extremely Thin at Evaporator Inlet
There is no ice, or a considerable lack of ice formation at
the inlet of the evaporator. Examples: The ice at the
outlet of the evaporator reaches 1/8" to initiate a harvest,
but there is no ice formation at all at the inlet of the
evaporator.
Possible causes: Insufficient water flow, flooding TXV,
etc.
OUTLET
INLET
Figure 7-4. Extremely Thin Ice Formation at
Evaporator Inlet
4. Spotty Ice Formation
There are small sections on the evaporator where there
is no ice formation. This could be a single corner, or a
single spot in the middle of the evaporator. This is
generally caused by loss of heat transfer from the tubing
on the back side of the evaporator.
OUTLET
INLET
ICE
ICE
Figure 7-5. Spotty Ice Formation
5. No Ice Formation
The ice machine operates for an extended period, but
there is no ice formation at all on the evaporator.
Possible causes: Water inlet valve, water pump, starving
expansion valve, low refrigerant charge, compressor,
etc.
Figure 7-6. No Ice Formation
Important
The S1800 model machines have left and right
expansion valves and separate evaporator circuits.
These circuits operate independently from each
other. Therefore, one may operate properly while
the other is malfunctioning.
Example: If the left expansion valve is starving, it
may not affect the ice formation pattern on the entire
right side of the evaporator.
OUTLET
OUTLET
Figure 7-7. S1800 Evaporator Tubing
7-8 Part Number 80-1634-3
INLET
INLET