Manitowoc Q130 series, Technician'S Handbook

Page: 107 / 236

Part Number 8001119 10/19 107
Extremely Thin at Evaporator Outlet
There is no ice, or a considerable lack of ice formation
on the outlet of the evaporator.
Examples: No ice at all at the outlet of the evaporator,
but ice forms at the inlet half of the evaporator. Or, the
ice at the outlet of the evaporator reaches the correct
thickness, but the outlet of the evaporator already has
1/2" to 1" of ice formation.
Possible cause: Water loss, low on refrigerant,
starving TXV, hot water supply, faulty float valve, etc.
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 the correct thickness,
but there is no ice formation at all at the inlet of the
evaporator.
Possible cause: Insufficient water flow, flooding TXV,
etc.
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 backside of the evaporator.
No Ice Formation
The ice machine operates for an extended period, but
there is no ice formation at all on the evaporator.
Possible cause: Water float valve, water pump,
starving expansion valve, low refrigerant charge,
compressor, etc.