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Maximum Set Point Determination
The maximum set point for the control is factory set. 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
NOTICE
Anytime that OJ1 is the only jumper cut, a
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.
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.
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.
Installation & Service Manual
5 Electrical connections
36