14
EASYTOUCH
®
PL4/PSL4 Control System Installation Guide
Temperature vs. Resistance Data
The EasyTouch PL4/PSL4 Control System use 10k Ohm thermistor sensors. When the solar
sensor is disconnected from the control system, the sensor will read 10k Ohm at 77º F (25ºC). Refer
to the following table for the resistance at other temperatures. An accurate reading should give a
temperature setting that is accurate
Temperature Resistance Temperature Resistance
°C °F
Ohm °C °F Ohm
-26
-15
139,300
16
60
15,310
-25
-13
130,300
18
65
13,480
-23
-10
118,000
21
70
11,880
-21 -5 100,200
24 75 10,500
-20
-4
97,000 25
25
77
10,000
-18
0
85,350 27
27
80
9,298
-15
5
72,910 29
29
85
8,250
-12
10
62,480 30
30
86
8,056
-9
15
53,640 32
32
90
7,331
-10
14
55,300 35
35
95
6,530
-7
20
46,230 38
38
100
5,826
-5 23 42,300
40 40 104
5,326
-4
25
39,910 41
41
105
5,209
-1 30 34,560
43 43 110
4,663
0 32 32,600
45 45 113
4,367
2
35
30,000 49
49
120
3,757
4.7 40 26,100
50 50 122
3,602
5
41
25,400 52
52
125
3,381
7 45 22,760
54 54 130
3,047
10
50
19,900 55
55
131
2,985
13 55 17,440
57 57 135
2,750
15
59
15,700
3. Run 22 AWG two-conductor cable (included in kit) between the sensor and the enclosure.
Route the cable up through the low voltage raceway to the circuit board.
4. Cut off the excess conductor and the strip conductors ¼ inch. Use waterproof connectors
(provided) to connect the sensor to cable. Insert the conductors into the
AIR
screw
terminals (
J21
) on right side of the circuit board. For sensor circuit board screw terminal
location (see diagram below).
J21
