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Boilers can be set to 240°F max. These maximum set points are established by cutting the OJ1 and OJ2 jumpers located on the right side of the temperature controller. The maximum set point is determined as shown below in Table 5C. TABLE - 5C MAXIMUM SET POINT DETERMINATION OJ1 OJ2 MAX. SET POINT Connected Connected 240°F Cut Connected 190°F Connected Cut 200°F Cut Cut 160°F Anytime that OJ1 is the only jumper cut, a NOTICE new overlay is required under the Set Point knob on the temperature controller because the scale has changed to a maximum of 190°F. Anytime the OJ2 jumper is cut (with or without OJ1), a new overlay is required under the Set Point knob on the temperature controller because the scale has changed to a maximum of 200°F. Set Point The Set Point knob specifies the target inlet 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 two-stage firing system. The two stages are High-Fire and Low-Fire. High-Fire operates all burners at full rate while Low-Fire operates the burners at approximately one-half rate. The High-Fire Offset knob specifies the number of degrees below set point that the High-Fire stage shuts down. At that point, the unit will continue to operate at the Low-Fire stage until the set point is reached. The High-Fire Offset knob has settings between 0°F and 20°F. If set at 0°F, the High-Fire Offset is disabled and the unit will operate the High-Fire stage until the set point is reached and the temperature control shuts the unit off. If the High Fire Offset knob is set to 0 or 1, the delay will be 10 seconds; if set to 2 or above the delay will be 120 seconds. Boiler Application Standard boiler units are equipped with one inlet water temperature sensor. A system sensor is also provided for use as a remote system sensor. Boilers with the outdoor air reset option also have an outside air temperature sensor. Temperature Control Sensors This is a two-stage temperature control that controls the burner ignition and pump functions. This temperature controller can measure up to three different sensor inputs, depending upon how the unit is set up. They are as follows: 1. Inlet Water Temperature Sensor 2. System 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. System Sensor 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 left-hand corner of the control panel. 5 Electrical connections (continued) 37 Installation & Service Manual 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. 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. 5. Make sure good mechanical connections are made to the sensor, any interconnecting wiring and the controller. 6. Do not mount sensor with leadwire end pointing up in an area where conden...

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