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 M atrix 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 Tem perature (
o
F)
R
e
s
is
ta
n
c
e
(
K
il
o
O
h
m
s
)
Figure 13.1 M atrix 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 Tem perature (
o
F)
R
e
s
is
ta
n
c
e
(
M
e
g
a
O
h
m
s
)
Figure 13.3 Outdoor 10K probe
0
10
20
30
40
50
60
70
80
90
100
100
75
50
25
0
Tem perature (F)
R
e
s
is
ta
n
c
e
(
K
il
o
O
h
m
s
)
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
