Manitowoc J250 User Manual

Section 6Electrical System
6-44
Temperature/Resistance Chart
As the temperature rises at the thermistor block, the
resistance drops.
Important
If the ohm meter reads “OL”, check the scale
setting on the meter before assuming the thermistor
is bad.
Temperature of Thermistor Resistance
°
°°
°F °
°°
°C K ohms (x 1000)
32° 0° 376.7 - 283.6
(ice water bath)
50° - 60° 10.0° - 15.6° 198.9 - 153.1
60° - 70° 15.6° - 21.1° 153.1 - 118.8
70° - 80° 21.1° - 26.7° 118.8 - 92.9
80° - 90° 26.7° - 32.2° 92.9 - 73.3
90° - 100° 32.2° - 37.8° 73.3 - 58.2
100° - 110° 37.8° - 43.3° 58.2 - 46.6
110° - 120° 43.3° - 48.9° 46.6 - 37.5
120° - 130° 48.9° - 54.4° 37.5 - 30.5
130° - 140° 54.4° - 60.0° 30.5 - 24.9
140° - 150° 60.0° - 65.6° 24.9 - 20.4
150° - 160° 65.6° - 71.1° 20.4 - 16.8
160° - 170° 71.1° - 76.7° 16.8 - 14.0
170° - 180° 76.7° - 82.2° 14.0 - 11.7
180° - 190° 82.2° - 87.8° 11.7 - 9.8
190° - 200° 87.8° - 93.3° 9.8 - 8.2
200° - 210° 93.3° - 98.9° 8.2 - 7.0
212° 100° 7.3 - 6.2
(boiling water bath)
220° - 230° 104.4° - 110.0° 5.9 - 5.1
230° - 240° 110.0° - 115.6° 5.1 - 4.3
240° - 250° 115.6° - 121.1° 4.3 - 3.7
250° - 260° 121.1° - 126.7° 3.7 - 3.3
ICE/OFF/CLEAN TOGGLE SWITCH
Function
The switch is used to place the ice machine in ICE,
OFF or CLEAN mode of operation.
Specifications
Double-pole, double-throw switch. The switch is
connected into a varying low D.C. voltage circuit.
Check Procedure
NOTE: Because of a wide variation in D.C. voltage,
it is not recommended that a volt meter be used to
check toggle switch operation.
1. Inspect the toggle switch for correct wiring.
2. Isolate the toggle switch by disconnecting all
wires from the switch, or by disconnecting the
Molex connector and removing wire #69 from the
toggle switch.
3. Check across the toggle switch terminals using a
calibrated ohm meter. Note where the wire
numbers are connected to the switch terminals, or
refer to the wiring diagram to take proper
readings.
Switch Setting Terminals Ohm Reading
66-62 Open
ICE 67-68 Closed
67-69 Open
66-62 Closed
CLEAN 67-68 Open
67-69 Closed
66-62 Open
OFF 67-68 Open
67-69 Open
4. Replace the toggle switch if ohm readings do not
match all three switch settings.

Manitowoc J250 Specifications

General

Brand	Manitowoc
Model	J250
Category	Ice Maker
Language	English