7
Single-stage SetPoint Controller Installation & Operation Manual
Floor Sensor Testing
A good-quality test meter capable of measuring up to 5,000 kΩ (1 kΩ = 1000Ω)
is required to measure the sensor resistance. In addition, measure the actual temperature with
either a good-quality digital thermometer, or if a thermometer
is not available, place a second sensor alongside the one to be tested and compare the
readings.
First, measure the room temperature using the thermometer. Disconnect the Sen and Com
wires from the thermostat. Using an electrical meter, measure the resistance of the Sen and
Com wires at the thermostat location. Using the Temperature vs. Resistance Table below,
estimate the temperature measured by the sensor. The sensor measurement and thermometer
readings should be close. If the test meter reads a very high resistance, there may be a broken
wire, a poor wiring connection or a defective sensor. If the resistance is very low, the wiring
may be shorted, there may be moisture in the sensor or the sensor may be defective. To test
for a defective sensor, measure the resistance directly at the sensor location. Once the test
has been completed, reconnect the Sen and Com wires to the thermostat.
Do not apply voltage to the temperature sensor terminals at any time as damage to the
sensor may result.
Temperature vs. Resistance Table
Temperature
Resistance
°F
°C
-50
-46
490,813
-45
-43
405,710
-40
-40
336,606
-35
-37
280,279
-30
-34
234,196
-25
-32
196,358
-20
-29
165,180
-15
-26
139,402
-10
-23
118,018
-5
-21
100,221
0
-18
85,362
5
-15
72,918
10
-12
62,465
15
-9
53,658
20
-7
46,218
Temperature
Resistance
°F
°C
25
-4
39,913
30
-1
34,558
35
2
29,996
40
4
26,099
45
7
22,763
50
10
19,900
55
13
17,436
60
16
15,311
65
18
13,474
70
21
11,883
75
24
10,501
80
27
9,299
85
29
8,250
90
32
7,334
95
35
6,532
