Installation / Operation Instruction Manual

The FT Series Wall Mounted, Combination Boiler
Page 59
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 6:OH “high outdoor
temperature set point”, the control point setting is
adjusted to 17:cL “low boiler temperature set point”.
When the outdoor air temperature reaches 7:OL “low
outdoor temperature set point” the control set point is
adjusted to 16:cH “high boiler temperature”.
Default outdoor reset set point is 100°F (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 16:cH and 17: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.
Note: In this example, the Summer Mode (Warm
Weather Shut-down) is set to 80F°
CH Outdoor Reset
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.
Operating condition
(Summer Mode)