Refrigeration System | Section 7 |
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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
ICE
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.
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.
OUTLET
INLET
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
ICE | OUTLET |
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INLET
INLET
Figure 7-5. Spotty Ice Formation
Figure 7-7. S1800 Evaporator Tubing
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