Set Point
The Set Point knob specifies the target outlet water temperature in degrees, Fahrenheit. After the water temperature reaches the set point, the temperature control shuts off the burners.
Differential
The Differential specifies the number of degrees below the set point that the control will allow the water temperature to drop before it brings the unit back on again.
High-Fire Offset
The temperature control operates a
The
The
No matter what the
Boiler Application
Standard boiler units are shipped with one sensor, the inlet water temperature sensor. An optional sensor can be purchased and installed for use as a remote system sensor. Boilers with the outdoor air reset option also have an outside air temperature sensor.
Water Heater Application
Water heater units are shipped with two sensors; the inlet water temperature sensor and the
Temperature Control Sensors
This is a
1.Inlet Water Temperature Sensor
2.Multi-Purpose Temperature Sensor
3.Outside Air Temperature Sensor
Inlet Water Temperature Sensor
This sensor measures the inlet water temperature coming into the unit.
The inlet water temperature sensor is placed into the inlet bulbwell on the boiler. This sensor is installed by the factory in new units.
Depending upon how your unit is set up, this sensor can be used as a system sensor in a boiler system or a tank sensor
for water heater applications. Connect this sensor to the two blue wires in the upper
Outdoor Air Temperature Sensor
The outside air temperature sensor will only be used for boiler systems. The outside air sensor is optional. This sensor allows you to tie boiler operation to the outdoor air temperature. As outside temperatures drop, the control will increase the temperature setting of the boiler. As outdoor temperatures rise, the control will decrease the temperature to the selected set point of the boiler. You can set the control to shut the boiler off when a desired outdoor air temperature level is reached.
You must purchase the sensor from the appliance manufacturer. The sensor comes with a housing that helps protect the sensor from the elements. Mount the air sensor housing outdoors, under the eve of the roof. Make sure the housing is out of direct sunlight. This will ensure that the sensor will accurately read the true outdoor temperature. Connect the outdoor air temperature sensor to the terminal block on the outdoor air reset board. For more information on wiring the sensor, see Wiring of Remote Sensors, this page.
Installation of Remote Sensors
Make sure to insert the sensor all the way into the bulbwell, leaving no air pocket between the front surface of the sensor and the back of the bulbwell. Air pockets are thermally
System Sensor
The system sensor is used for boiler applications. Install the sensor in the system supply to the building.
Tank Sensor
The tank sensor is used in water heating applications. Install the sensor in a water storage tank to measure water temperature. For more information on wiring the sensor, see Wiring of Remote Sensors below.
Wiring of Remote Sensors
To wire remote sensors, follow the guidelines below. Take care to correctly wire sensors to the unit. Erratic temperature readings can be caused by poor wiring practices. Twist the wires between the unit and the remote sensor. Turn wires at least three or four turns per linear foot of wiring. This provides protection against some types of electrical interferences.
1.Do not route temperature sensor wiring with building power wiring.
2.Do not locate temperature sensor wiring next to control contactors.
3.Do not locate temperature sensor wiring near electric motors.
4.Do not locate temperature sensor wiring near welding equipment.
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