The FT Series Heating Only, Boiler
Page 65
5.9 Outdoor Reset Adjustment
5.10 External Set Point Temperature Control
Outdoor Reset varies the control set point based on the
outdoor temperature. The reset function works as shown
in Figure ‘CH Outdoor Reset’. When the outdoor air
temperature reaches 4:OH “high outdoor temperature
set point”, the control point setting is adjusted to 7:cL
“low boiler temperature set point”. When the outdoor air
temperature reaches 5:OL “low outdoor temperature set
point” the control set point is adjusted to 6:cH “high boiler
temperature”.
Default warm weather shutdown temprature is 100ºF (38 C)
A signal from a building management system may be connected to the appliance to enable remote
control. This signal should be a 0-10 volt DC signal. When this input is enabled, a building control
system can be used to control the set point temperature of the appliance.
The control interprets the 0-10 volt signal as follows; when the signal is between 0 and 1.5 volts, the
appliance will be in standby mode, not ring.
When the signal rises above 1.5 volts, the appliance will ignite. As the signal continues to rise
towards its maximum of 10 volts, the appliance will increase in set point temperature. Adjust 6:cH
and 7:cL to set MIN and MAX boiler water temperatures respectively.
Connect a building management system or other auxiliary control signal to the terminals marked
for this purpose on the appliance terminal block (shown in Piping Diagrams, this manual). Caution
should be used to ensure that the 0-10 VOLT + connection does not become connected to ground.
Connect to terminal strip as outlined 4.17 Electrical Connections.
NOTE: 0 - 10VDC terminals may not be used for both outdoor reset and 0 - 10VDC temp set
point simultaneously.
The Outdoor Temperature Mode Icon on the display
will ash if an Outdoor Sensor or 0-10 Volt is not
connected to the appliance.
To check the CH Target Temperature while using
Outdoor Temperature Mode, press the button
while the appliance is operational and the display
panel is powered on.
Connect to terminal strip as outlined 4.17 Electrical Connections.
NOTE: 0 - 10VDC terminals may not be used for both outdoor reset and 0 - 10VDC
temperature set point simultaneously.
Outdoor Reset
Operating condition
Note: In this example, the Summer Mode
(Warm Weather Shut-down) is set to 80F°
(Summer Mode)
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