TM018 Raypak 131 Type A Pool & Spa Heaters REV: A
D.O.I: 8/04/2009
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40
Fault Finding Tests 20
– 21
Test 20
Using a multimeter on the AC voltage
scale, measure between the two terminals
on the gas valve.
The following result should be obtained:
24 Volts AC.
Fault Finding Test 21
– Water Temperature Probes
This test procedure and the temperature/resistance chart
below are the same for the water temperature probe and
solar collector water temperature probe (if fitted).
1. Remove the water temperature probe from the in/out
header (or solar collector) and hang in free air away
from any components.
2. Place thermometer probe tip next to tip of water
temperature probe so both probes measure the ambient
air temperature at the same location.
3. Disconnect the water temperature probe from the control
board, connect a multimeter to the probe plug and select
the ohms scale on the multimeter.
4. Compare the ohms reading to the thermometer
temperature and check against the water table shown
below allowing for a tolerance of + or - 3ºC.
Water Temperature Probe Temperature/Resistance Chart
All temperatures shown in ºC
Temp
k
Ω
Temp
k
Ω
Temp
k
Ω
Temp
k
Ω
Temp
k
Ω
50
3.53
40
4.94
30
7.04
20
10.17
10
15.58
49
3.64
39
5.09
29
7.34
19
10.55
9
16.40
48
3.76
38
5.29
28
7.59
18
11.11
8
17.01
47
3.86
37
5.43
27
7.84
17
11.85
7
17.51
46
3.97
36
5.68
26
8.90
16
12.34
6
18.88
45
4.15
35
5.88
25
8.45
15
12.81
5
18.06
44
4.30
34
6.11
24
8.79
14
13.16
4
18.77
43
4.45
33
6.31
23
9.28
13
14.06
3
21.13
42
4.58
32
6.52
22
9.55
12
14.44
2
21.68
41
4.79
31
6.77
21
9.89
11
15.03
1
23.04
