NTI Matrix - Page 70

Installation and Operation Instructions Matrix
70
The following are the thermistor curves for diagnosing the water and outdoor air sensors:
 Measure the resistance of the thermistor when disconnected.
 Using the appropriate chart, find the resistance and move either vertical (water probe) or horizontal (air probe)
until the line is intersected.
 Move 90 degrees to the corresponding temperature.
 If the temperature is plus or minus 10 degrees, then the probe is operating correctly.
Figure 13.2 Matrix Thermistor Resistance Chart
1 Mohm Water Probe (Hi Temp.)
0
20
40
60
80
100
120
160 170 180 190 200 210 220 230
Water Temperature (
o
F)
Resistance (Kilo Ohms)
Figure 13.1 Matrix Thermistor Resistance Chart
1 Mohm Water Probe (Low Temp.)
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
50 60 70 80 90 100 110 120 130 140
Water Temperature (
o
F)
Resistance (Mega Ohms)
Figure 13.3 Outdoor 10K probe
0
10
20
30
40
50
60
70
80
90
100
100 75 50 25 0
Temperature (F)
Resistance (Kilo Ohms)
Figure 20-1 Thermistor Resistance Chart – 1 MOhm Water Probe (Low Temp.)
Figure 20-2 Thermistor Resistance Chart – 1 MOhm Water Probe (High Temp.)
Figure 20-3 Thermistor Resistance Chart – 10 kOhm Outdoor Sensor