Temperature Sensor - Manitowoc QF0400 Technician's Handbook

TEMPERATURE SENSOR

QF0400/QC0700/QF0800/QF2200/QF2300
FUNCTION
The temperature sensor provides input to the control
board. The control board monitors the temperature
anytime the liquid line solenoid valve or compressor is
energized. When a temperature is sensed that is
above or below the correct temperature range, the ice
machine de-energizes.
TEMPERATURE RANGES:
QF0400/QC0700/QF0800 155°F to 255°F
(68°C to 124°C)
QF2200 30°F to 123°F (-1°C to 51°C)
Specifications
10,000 Ohms at 77°F (25°C)
Use only Manitowoc thermistors.
CHECK PROCEDURE
The thermistor must be securely attached and
insulated to operate properly.
Verify that the thermistor resistance is accurate and
corresponding 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
refrigeration line next to the thermistor.
Do not simply "insert" the sensing device under the
insulation. It must be attached to and reading the
actual temperature of the discharge line.
Part Number 80-1230-9 10/10
! Caution
Important
167