INPUT SIGNAL | EXTERNAL INPUT SIGNAL CONVERSION TABLES |
The control can accept either a 0 - 10 V (dc) signal or a 2 - 10 V (dc) signal. The External Input Signal setting must be set to the proper setting based on the signal that is being sent to the control.
0 - 10 V (dc) or 0 - 20 mA
When the 0 - 10 V (dc) signal is selected, an input voltage of 1 V (dc) corresponds to a boiler target temperature of 50°F (10°C). An input voltage of 10 V (dc) corresponds to a boiler target temperature of 210°F (99°C). As the voltage varies between 1 V (dc) and 10 V (dc) the boiler target tem- perature varies linearly between 50°F (10°C) and 210°F (99°C). If a voltage below 0.5 V (dc) is received the boiler target temperature is displayed as " - - - " indicating that there is no longer a call for heating.
A 0 - 20 mA signal can be converted to a 0 - 10 V (dc) sig- nal by installing a 500 ohm resistor between the Out + and Com - terminals (4 and 1).
2 - 10 V (dc) or 4 - 20 mA
When the 2 - 10 V (dc) signal is selected, an input voltage of 2 V (dc) corresponds to a boiler target temperature of 50°F (10°C). An input voltage of 10 V (dc) corresponds to a boiler target temperature of 210°F (99°C). As the voltage varies between 2 V (dc) and 10 V (dc) the boiler target tem- perature varies linearly between 50°F (10°C) and 210°F (99°C). If a voltage below 1.5 V (dc) is received the boiler target temperature is displayed as " - - - " indicating that there is no longer a call for heating.
A 4 - 20 mA signal can be converted to a 2 - 10 V (dc) sig- nal by installing a 500 ohm resistor between the Out + and Com - terminals (4 and 1).
OFFSET
The Offset setting allows the boiler target temperature to be fine tuned to the external input signal. The control reads the external input signal and converts this to a boiler target tem- perature. The Offset setting is then added to the boiler tar- get temperature.
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