Zone
Zone
TROUBLESHOOTING
Pioneer Gold 1.10 & 2.05 Controller Technical Guide
1-36
Thermistor Sensor Testing Instructions
Use the resistance column to check the thermistor sensor while
disconnected from the controllers (not powered).
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 3.05 VDC, then the sensor or wiring is “open.”
If the voltage is less than 0.18 VDC, then the sensor or wiring is
shorted.
Type III 10K Ohm Temp Sensor Testing
The following sensor voltage and resistance table is provided to aid
in checking sensors that appear to be operating incorrectly. Many
system operating problems can be traced to incorrect sensor wiring.
Be sure all sensors are wired per the wiring diagrams in this manual.
If the sensors still do not appear to be operating or reading correctly,
check voltage and/or resistance to confirm that the sensor is operating
correctly per the tables. Please follow the notes and instructions that
appear after the chart when checking sensors.
Temperature – Resistance – Voltage for
Type III 10 K Ohm Thermistor Sensors
Temp
(ºF)
Resistance
(Ohms)
Voltage @ Input
(VDC)
-10
93333
3.05
-5
80531
3
0
69822
2.97
5
60552
2.92
10
52500
2.87
15
45902
2.81
20
40147
2.76
25
35165
2.69
30
30805
2.62
35
27140
2.55
40
23874
2.47
45
21094
2.39
50
18655
2.3
52
17799
2.27
54
16956
2.24
56
16164
2.2
58
15385
2.17
60
14681
2.13
62
14014
2.1
64
13382
2.06
66
12758
2.02
68
12191
1.98
69
11906
1.97
70
11652
1.95
71
11379
1.93
72
11136
1.91
73
10878
1.9
74
10625
1.88
75
10398
1.86
76
10158
1.84
77
10000
1.82
Table 7: Temperature/Resistance for Type III 10K
Ohm Thermistor Sensors
Temperature Sensor Testing & Glycol % Freeze Protection Setpoints
Temperature – Resistance –
Voltage for Type III 10 K Ohm
Thermistor Sensors
Temp
(ºF)
Resistance
(Ohms)
Voltage @
Input (VDC)
78
9711
1.8
80
9302
1.77
82
8893
1.75
84
8514
1.69
86
8153
1.66
88
7805
1.62
90
7472
1.59
95
6716
1.49
100
6047
1.41
Table 7, cont.: Temperature/Resistance for Type III
10K Ohm Thermistor Sensors
Glycol % Freeze Protection Setpoints
Glycol %
Temp Setpoint (ºF)
0
35°F
5
32°F
10
29°F
15
26°F
20
22°F
25
17°F
30
12°F
35
5°F
40
-3°F
Glycol % Freeze Protection Setpoints
The Pioneer Gold setpoints are preset at AAON and are based on the
unit’s design as well as the type of coolant being used in the water
loop. See
Table 8
, below for default settings.
Table 8: Factory-Set Default Setpoints - Glycol
