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27
Setting The Boiler Temperature
Without the Outdoor Air Temp - Sensor Installed
To set the maximum boiler water temperature, simply
turn the Max. Temp. water temperature dial to the
desired setting. The control and the boiler will then
perform to achieve and maintain the set temperature.
The Min. Temp. Knob is the boiler water temperature
minimum, or the lowest temperature the water will
go before the unit re-starts. Turning the knob fully
counterclockwise is the “OFF” position, while turning
the knob clockwise, past the 140 degree marking, is the
“ON” position.
With The Outdoor Air Temp - Sensor Installed
Maximum boiler temp setting is as described above,
with the added feature of automatic maximum water
temp controlled by the OAT sensor.
The MIN. TEMP. knob, in addition to being the mode
setting (on or off), also has the function of setting the
minimum boiler water temperature. This would be the
lowest boiler water temperature that you want to have
based on the following factors;
1.) Outdoor Air Temperature (OAT)
2.) Domestic Hot Water Use
a.) Hot Water Coil Option
b.) Indirect Hot Water Storage
3.) Overall Volume of the Heating System
The boiler is designed to withstand lower return water
temperatures. However, extended return temperatures below
140 degrees F can cause condensation.
NOTE:
If the system is run at the lower temperature settings,
conditions of the rebox, boiler tubes, secondary ash chamber
and venting should be monitored closely. If any indications
show excess condensation, the boiler water temperature will
need to be increased until condensation does not occur.
Control Board Operation
Aquastat Sensor - This sensor is located behind the
control panel. This sensor, along with the outdoor air
sensor, is what the control board uses to regulate the burn
rate based on the observed conditions. (Boiler Temp. &
Outdoor Air Temperature)
Outdoor Air Temp - Sensor (OAT): This sensor is
located outside the building (on the north side of the
house and out of direct sunlight). The Outdoor Air
Sensor is used to perform hot water reset based on
outdoor air temperatures.
When the OAT sensor is installed, at 20° F. or below
(outside temperature), the boiler will operate at the
temperature set on the MAX. TEMP. knob. The boiler
water temperature will decrease by 1 degree F. for
every 1 degree F. in temperature rise (above 20°) of the
outdoor air.
NOTE: Pellet Boiler Outdoor Air Reset Operation
Graph located on page 28.
WATER TEMPERATURE
MAX. TEMP.
MIN. TEMP.