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Troubleshooting
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1
Check general wiring, as per heater manufacturer diagram.
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Be sure you understand the system and its normal operation
•
2
Verify high voltage power supply wiring
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Verify that correct voltage is present at the heater with proper wire size
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Verify low voltage 24 Vac power supply wiring: 24 Vac is present at terminals 1 & 2 of the
3
R820 SCR
•
4
Create or simulate 100 % heating demand Using present control system
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Signal between terminals 1 & 3 is 10 Vdc or superior
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Dip switch properly configured: S1=Off, S2=Off, S3=Off & S4=On
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Be sure that the polarity is correct and not reversed + to +, - to –
•
LED on SCR is on 100 % of the time
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Signal between terminals 1 & 3 is 20 mA or superior
•
Dip switch properly configured: S1=Off, S2=Off, S3=On & S4=Off
•
Be sure that the polarity is correct and not reversed + to +, - to –
•
LED on SCR is on 100 % of the time
•
Verify amperage consumption of the heater: LED on SCR is on 100 % of the time
5
•
6
Verify & correct 24 Vac power supply to the SCR
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Verify low voltage fuses, protections, flow switch,
•
7
Verify control wiring & control signal
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Correct control signal is present at the SCR Check polarity of control signal
•
8
Verify fuses & all protections & contact the heater manufacturer
R820 Configured for 0 to 10 Vdc input signal
R820 Configured for 4 to 20 mA input signal
Viconics Technologies Inc.
Tel.:
Fax:
Toll free:
www.viconics.com
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