- WattMaster Water Source Heat Pump Operations Manual

WattMaster WHP Section 4
Start-Up and Troubleshooting 4-41
5.5 Temperature Sensor Resistance
Chart
º
82 8893 2.407
84 8514 2.352
86 8153 2.297
88 7805 2.242
90 7472 2.187
95 6716 2.055
100 6047 1.927
105 5453 1.805
110 4923 1.687
115 4449 1.575
120 4030 1.469
125 3656 1.369
130 3317 1.274
135 3015 1.185
140 2743 1.101
145 2502 1.024
150 2288 0.952
*Notes:
1. Use the resistance column to check the
thermistor sensor while disconnected from
the controllers (not powered).
2. Use the voltage column to check sensors
while connected to powered controllers. Read
voltage with meter set on DC volts. Place the
“-”(minus) lead on GND terminal and the
“+”(plus) lead on the sensor input terminal
being investigated.
If the voltage is above 5.08 VDC, then the
sensor or wiring is “open.” If the voltage is
less than 0.05 VDC, the sensor or wiring is
shorted.
º
-10 93333 4.620
-5 80531 4.550
0 69822 4.474
5 60552 4.390
10 52500 4.297
15 45902 4.200
20 40147 4.095
25 35165 3.982
30 30805 3.862
35 27140 3.737
40 23874 3.605
45 21094 3.470
50 18655 3.330
52 17799 3.275
54 16956 3.217
56 16164 3.160
58 15385 3.100
60 14681 3.042
62 14014 2.985
64 13382 2.927
66 12758 2.867
68 12191 2.810
69 11906 2.780
70 11652 2.752
71 11379 2.722
72 11136 2.695
73 10878 2.665
74 10625 2.635
75 10398 2.607
76 10158 2.577
78 9711 2.520
80 9302 2.465