Technical Guide
Troubleshooting
Note: Power to the Controller being addressed must always be cycled after changing address switch settings in order for the changes to take effect. Always unplug the communications terminal block before removing the power terminal block from the board. When finished reinstall the power terminal block first and then the communications terminal block.
If LED2 blinks the correct address your board is addressed correctly. If it does not light up at all, the board is not operating correctly and could be defective.
If all of these tests are made and the controller still doesn’t operate, see the WattMaster VAV Component & System Wiring - Technical Guide for more information or contact the WattMaster Technical Support Toll
Free Number at 866-918-1100 for further assistance.
Appendix
Sensor Checks
The following sensor voltage and resistance tables are 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 below each chart when checking sensors.
Temp
(
º
F)
Resistance
(Ohms)
Temperature – Resistance – Voltage For Type III 10 K Ohm Thermistor Sensors
Voltage @
Input (VDC)
Temp
(
º
F)
Resistance
(Ohms)
Voltage @
Input (VDC)
Temp
(
º
F)
Resistance
(Ohms)
Voltage @
Input (VDC)
50
52
54
56
58
30
35
40
45
10
15
20
25
-10
-5
0
5
93333
80531
69822
60552
52500
45902
40147
35165
30805
27140
23874
21094
18655
17799
16956
16164
15385
4.620
4.550
4.474
4.390
4.297
4.200
4.095
3.982
3.862
3.737
3.605
3.470
3.330
3.275
3.217
3.160
3.100
Thermistor Sensor Testing Instructions
Use the resistance column to check the thermistor sensor while disconnected from the controllers (not powered).
76
78
80
82
84
72
73
74
75
68
69
70
71
60
62
64
66
11136
10878
10625
10398
10158
9711
9302
8893
8514
14681
14014
13382
12758
12191
11906
11652
11379
3.042
2.985
2.927
2.867
2.810
2.780
2.752
2.722
2.695
2.665
2.635
2.607
2.577
2.520
2.465
2.407
2.352
86
88
90
95
100
105
110
115
120
125
130
135
140
145
150
8153
7805
7472
6716
6047
5453
4923
4449
4030
3656
3317
3015
2743
2502
2288
1.469
1.369
1.274
1.185
1.101
1.024
0.952
2.297
2.242
2.187
2.055
1.927
1.805
1.687
1.575
nus) lead on GND terminal and the “+”(plus) lead on the sensor input terminal being investigated.
Use the voltage column to check sensors while connected to powered controllers. Read voltage with meter set on DC volts. Place the “-”(mi-
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.
28
WMVAV Controller
Technical Guide
OE271 Duct Static Pressure Sensor
Pressure
@
Sensor
(“ W.C.)
2.10
2.20
2.30
2.40
2.50
1.30
1.40
1.50
1.60
1.70
1.80
1.90
2.00
0.60
0.70
0.80
0.90
1.00
1.10
1.20
0.00
0.10
0.20
0.30
0.40
0.50
Voltage
@
Input
(VDC)
0.25
0.33
0.40
0.48
0.55
0.63
0.70
0.78
0.85
0.93
1.00
1.08
1.15
1.23
1.30
1.38
1.45
1.53
1.60
1.68
1.75
1.83
1.90
1.98
2.05
2.13
Pressure
@
Sensor
(“ W.C.)
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
3.60
3.70
3.80
3.90
4.00
4.10
4.20
4.30
4.40
4.50
4.60
4.70
4.80
4.90
5.00
OE271 Pressure Sensor Testing Instructions
Use the voltage column to check the Duct Static Pressure Sensor 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 0-5 pin terminal on (JP1) with the jumper removed. Be sure to replace the jumper after checking.
Voltage
@
Input
(VDC)
3.18
3.25
3.33
3.40
3.48
3.55
3.63
3.70
3.78
3.85
3.93
4.00
2.65
2.73
2.80
2.88
2.95
3.03
3.10
2.20
2.28
2.35
2.43
2.50
2.58
OE258 Building Pressure Sensor
Pressure
@
Sensor
(“ W.C.)
-0.12
-0.11
-0.10
-0.09
-0.08
-0.07
-0.06
-0.05
-0.04
-0.03
-0.02
-0.01
0.00
-0.19
-0.18
-0.17
-0.16
-0.15
-0.14
-0.13
-0.25
-0.24
-0.23
-0.22
-0.21
-0.20
Voltage
@
Input
(VDC)
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.70
1.80
1.90
2.00
2.10
2.20
2.30
2.40
2.50
Pressure
@
Sensor
(“ W.C.)
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.18
0.19
0.20
0.21
0.22
0.23
0.24
0.25
OE258 Building Pressure Sensor Testing Instructions
Use the voltage column to check the Building Static Pressure Sensor while connected to a powered expansion board. Read voltage with meter set on DC volts. Place the “-”(minus) lead on terminal labeled GND and the “+” lead on terminal AIN4 on the Analog Input/Output Expansion Board.
Voltage
@
Input
(VDC)
3.90
4.00
4.10
4.20
4.30
4.40
4.50
4.60
4.70
4.80
4.90
5.00
3.20
3.30
3.40
3.50
3.60
3.70
3.80
2.60
2.70
2.80
2.90
3.00
3.10
WMVAV Controller
29
Appendix
Technical Guide
Humidity
Percentage
(RH)
16%
18%
20%
22%
24%
0%
2%
4%
6%
8%
10%
12%
14%
Voltage
@
Input
(VDC)
1.00
1.08
1.16
1.24
1.32
1.40
1.48
1.56
1.64
1.72
1.80
1.88
1.96
OE265 Relative Humidity Transmitters – Humidity vs. Voltage
Humidity
Percentage
(RH)
42%
44%
46%
48%
50%
26%
28%
30%
32%
34%
36%
38%
40%
Voltage
@
Input
(VDC)
2.68
2.76
2.84
2.92
3.00
2.04
2.12
2.20
2.28
2.36
2.44
2.52
2.60
OE265-03 Relative Humidity Sensor
Testing Instructions:
Use the voltage column to check the Humidity Sensor while connected to a powered expansion board. Read voltage with meter set on DC volts.
Place the “-”(minus) lead on terminal labeled GND and the “+” lead on terminal AIN4 on the Analog Input/Output Expansion Board.
Humidity
Percentage
(RH)
68%
70%
72%
74%
76%
52%
54%
56%
58%
60%
62%
64%
66%
Voltage
@
Input
(VDC)
3.72
3.80
3.88
3.96
4.04
3.08
3.16
3.24
3.32
3.40
3.48
3.56
3.64
Humidity
Percentage
(RH)
78%
80%
82%
84%
86%
88%
90%
92%
94%
96%
98%
100%
Voltage
@
Input
(VDC)
4.12
4.20
4.28
4.36
4.44
4.52
4.60
4.68
4.76
4.84
4.92
5.00
30
WMVAV Controller
Notes
Technical Guide
WMVAV Controller
31
Form: WM-WMVAV-TGD-01A Printed in the USA
All rights reserved
May 2004
Copyright 2004
WattMaster Controls Inc.
·
8500 NW River Park Drive
·
Parkville MO
·
64152
Phone (816) 505-1100 E-mail: [email protected]
Fax (816) 505-1101
