Part Number 80-01111-9 7/10 169
Liquid Line Thermistor
QM20/QM30/SM50
Function
The liquid line thermistor senses the refrigeration system
liquid line temperature. This is used in conjunction with the
control board to determine the length of the freeze and
harvest cycles.
Specifications
10,000 Ohms 2% at 25°C (77°F)
Check Procedure
Thermistors generally fail because of moisture or physical
damage. Manitowoc liquid line thermistors are encased in a
specially designed, moisture-sealed aluminum block. This
eliminates physical damage and moisture concerns.
Verify that the thermistor resistance is accurate and
corresponds to the high and low temperature ranges.
1. Disconnect the thermistor at the control board. Connect
the ohmmeter to the isolated thermistor wire leads.
2. Using a temperature meter capable of taking readings
on curved copper lines, attach the temperature meter-
sensing device to the liquid line next to the thermistor
aluminum block.
3. With the ice machine running, verify that the
temperature of the discharge line (step 2) corresponds
to the thermistor resistance reading (step 1) as stated in
the temperature/resistant chart.
Do n ot simply “in sert” the sensing devi ce und er
the insulation. It must b e attached to and reading
the actual temperature of the copper liquid line.
If the thermistor would fail closed, the light on the
control board will flash rapidly.
If th e thermistor woul d fail open , the ligh t on the
control board will flash slowly.
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