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54
Temperature control
Modulation
The Power-fin is capable of modulating its firing rate from a
minimum of 20% (M9) or 60% (B9) to a maximum of
100%. The F9 model can only fire at 100%. The firing rate
is dictated by the call for heat (i.e., space heating or domestic
hot water), the heating load, ramp delay (if enabled), and
various other temperature limitations.
Ramp delay (boiler only)
For systems with lower flow, the SMART SYSTEM can limit
the firing rate (when enabled) when a space heating call for
heat starts, or when switching from a DHW call for heat to a
space heating call for heat. There are six (6) limits that can
be programmed, as well as six (6) time intervals
corresponding to each limit. The sixth limit will also limit
the firing rate for the rest of the call for heat.
Gradient limiting
If during operation of the heater the outlet water
temperature is rising too quickly, the control will reduce the
firing rate to its lowest setting.
Outdoor air reset (boiler only)
With the outdoor air sensor connected, the control module
will calculate the set point based on the programmed reset
curve. The installer can change the slope of the reset curve
by several adjustable parameters. The user can limit the
maximum set point for the system using the space heating
set point.
Boost function (boiler only)
If outdoor air reset is active, and a space heating demand has
been active continuously for a set period of time (time
adjustable by installer) and there has been no DHW
demands, the control may be programmed to increase the set
point by a fixed number of degrees (adjustable by installer).
This process will repeat until the space heating demand ends,
the set point reaches the programmed set point or a
maximum of 20 increases has occurred. Once the system
heat demand is satisfied, the set point will revert to the value
determined by the reset curve.
Night setback
The controller may be programmed to reduce the space
heating (boilers) and tank (water heaters) set points during
a certain time each day. A start and stop time can be
programmed for each day of the week.
Flame current support
To prevent nuisance shutdowns when the boiler is firing at
minimum rates, the control will increase fan speed when the
flame signal drops too low.
This feature of the SMART SYSTEM control
module does not eliminate the possibility of
freezing. The installer must still use
recognized design, installation and
maintenance practice to prevent freeze
potential for the appliance and system.
ƽ CAUTION
Protection features
Outlet temperature, flue temperature, and temperature
rise limiting
The outlet temperature is monitored by the boiler outlet
temperature sensor. When the outlet temperature exceeds 215°F
(85°C) (boilers) or 185°F (85°C) (water heaters), the unit will
reduce the fan speed. If the outlet water temperature exceeds
225°F (107°C) (boilers) or 195° (90.6°C) (water heaters) the
control will shut the unit down until it cools off.
The control module monitors the flue temperature by a sensor
located in the flue exhaust. If the flue temperature exceeds 400°F
(204°C) the control will reduce the maximum fan speed. If the
flue temperature exceeds 450°F (232°C) the control will shut the
unit down. The unit will restart automatically once the flue
temperature drops 100°F (56°C) and the minimum off time has
expired.
The control monitors the temperature difference between the
inlet and the outlet sensor. If this difference exceeds 55°F (31°C)
the control will reduce the fan speed. If the temperature
difference exceeds 65°F (36°C) the control will shut the unit
down. The unit will restart automatically once the temperature
difference has dropped 10°F (6°C) and the minimum off time
has expired.
Freeze protection
DO NOT install the appliance in a room likely to freeze.
The following integral feature of the SMART SYSTEM control
module provides some protection for the appliance only -- not
for the system.
• The SMART SYSTEM control module provides
freeze-up protection as follows when the appliance
water temperature drops below 45°F (7.2°C):
• Below 45°F (7.2°C), the appliance and system pumps
operate constantly.
• Below 37°F (2.7°C), the appliance turns on.
• Appliance and pumps turn off if appliance water
temperature rises above 45°F (7.2°C).
High limit operations
When outlet temperature exceeds 230°F (110°C) (boilers) or
200°F (93°C) (water heaters), high limit action occurs. The
appliance shuts down until the outlet water cools down and the
RESET button on the Operator Interface is pressed.
8 Operating information
Installation & Operation Manual