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A good quality test meter capable of measuring up to 5,000 kΩ
(1 kΩ = 1000 Ω) is required to measure the sensor resistance.
In addition, the actual temperature must be measured with
either a high-quality digital thermometer, or if a thermometer
is not available, a second sensor can be placed alongside
the one to be tested and the readings compared.
First, measure the temperature using the thermometer and
then measure the resistance of the sensor at the control. The
wires from the sensor must not be connected to the control
while the test is performed. Using the chart below, estimate
the temperature measured by the sensor. The sensor and
thermometer readings should be close. If the test meter reads
a very high resistance, there may be a broken wire, a poor
wiring connection or a defective sensor. If the resistance is
very low, the wiring may be shorted, there may be moisture
in the sensor or the sensor may be defective. To test for
a defective sensor, measure the resistance directly at the
sensor location.
Do not apply voltage to a sensor at any time as damage
to the sensor may result.
Testing the Sensor Wiring
Temperature
Resistance
Temperature
Resistance
Temperature
Resistance
Temperature
Resistance
°F
°C
°F
°C
°F
°C
°F
°C
-50
-46
490,813
20
-7
46,218
90
32
7,334
160
71
1,689
-45
-43
405,710
25
-4
39,913
95
35
6,532
165
74
1,538
-40
-40
336,606
30
-1
34,558
100
38
5,828
170
77
1,403
-35
-37
280,279
35
2
29,996
105
41
5,210
175
79
1,281
-30
-34
234,196
40
4
26,099
110
43
4,665
180
82
1,172
-25
-32
196,358
45
7
22,763
115
46
4,184
185
85
1,073
-20
-29
165,180
50
10
19,900
120
49
3,760
190
88
983
-15
-26
139,403
55
13
17,436
125
52
3,383
195
91
903
-10
-23
118,018
60
16
15,311
130
54
3,050
200
93
829
-5
-21
100,221
65
18
13,474
135
57
2,754
205
96
763
0
-18
85,362
70
21
11,883
140
60
2,490
210
99
703
5
-15
72,918
75
24
10,501
145
63
2,255
215
102
648
10
-12
62,465
80
27
9,299
150
66
2,045
220
104
598
15
-9
53,658
85
29
8,250
155
68
1,857
225
107
553
Testing the Control Wiring
Remove the front cover from the control.
Testing the Power
-------------------------------
-------------------------------
• Use an electrical meter set to measure (ac) voltage.
• Measure between the L and N terminals.
• The reading should be 115 V (ac) +/– 10%.
Hand Manual Override
---------------------------
---------------------------
The control includes a Hand Manual Override menu to check
if the control’s relays are operating and that the control is wired
correctly to the snow melting equipment.
Step 1: Press Settings button.
Step 2: Press Override button.
Step 3: Press Manual Override.
Step 4: Select Manual Override to Hand.
Step 5: Press Back button.
Step 6: The following outputs can be operated:
• System Pump relay
• Heat Relay
• Boiler Stage 1 relay
• Boiler Stage 2 relay
• Boiler Modulation 0-10 V (dc) or 4-20 mA signal
• Mix System Output 0-10 V (dc) or 4-20 mA signal
• Mix System Output floating action relays
• Mix System Output variable-speed injection pump
For each relay output
• Use an electrical meter set to measure (ac) voltage.
• Measure between the relay wiring terminals.
• When the relay is off, the voltage should be 115 V (ac).
• When the relay is on, the voltage should be 0 V (ac).
For the Boiler Modulation
• Use an electrical meter set to measure V (dc) or mA.
• Set the Boiler Modulation to 100%.
• The voltage between the + and – wiring terminals should be
10 V (dc) or 20 mA.
• Set the Boiler Modulation to 0%.
• The voltage between the + and – wiring terminals should be
0 V (dc) or 4 mA.
For the Mix System Output
–
Floating Action
• Use an electrical meter set to measure (ac) voltage.
• Set the Mix Output to 100%. The floating action open wiring
terminal will be closed for the length of the motor speed set-
ting (default is 105 seconds).
• When opening, the voltage between the open and common
wiring terminals should be 24 V (ac) or 115 V (ac).
• When opening, the voltage between the close and common
wiring terminals should be 0 V (ac).
• Set the Mix Output to 0%. The floating action closed wiring
terminal will be closed for the length of the motor speed set-
ting (default is 105 seconds).
• When closing, the voltage between the open and common
wiring terminals should be 0 V (ac).
• When closing, the voltage between the close and common
wiring terminals should be 24 V (ac) or 115 V (ac).
