Boiler Control Instruction & Operation Manual
Page 4
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of
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Setup & Tuning
Parameter Adjustment
Factory
Setting
Range /
Choices
Parameter and Description
Disabled
Enable
Disable
Outdoor Reset Enable
If an outdoor sensor is installed and Outdoor Reset is Enabled, the boiler will
automatically adjust the heating set point temperature based on the outdoor reset
curve in (see Figure 20). The maximum set point is defined by the Central Heat
Setpoint (default 180 F) when the outdoor temperature is Min Outdoor Temp (default
32 F) or below. The minimum set point temperature shown is 130°F when the outdoor
temperature is 50°F or above. As the outdoor temperature falls the supply water target
temperature increases.
Disable
Do Not Calculate setpoint based on outdoor temperature
Enable
Calculate the temperature setpoint based on outdoor temperature
using a reset curve defined by Low Outdoor Temp, High Outdoor
Temp, Low Boiler Water Temp, Min Boiler Temp and Central Heat
Setpoint and Boost Time parameters.
30 (ºF)
-50 to 32 (ºF)
Minimum Outdoor Temperature
The Low Outdoor Temperature parameter is also called
“Outdoor Design
Temperatur
e”. This parameter is the outdoor temperature used in the heat loss
calculation. It is typically set to the coldest outdoor temperature.
70 (ºF)
35 to 100 (ºF)
Maximum Outdoor Temperature
The High Outdoor Temperature parameter is the outdoor temperature at which the
Low Boiler Water Temperature is supplied. This parameter is typically set to the
desired building temperature.
110 (ºF)
70 to 180
(ºF)
Low Water Temperature
The Low Boiler Water Temperature parameter is the operating setpoint when the High
Outdoor Temperature is measured. If the occupied space feels cool during warm
outdoor conditions, the Low Boiler Water Temperature parameter should be increased.
130 (ºF)
50 to 185
(ºF)
Minimum Boiler Water Temperature
The Minimum Boiler Temperature parameter sets a low limit for the Reset setpoint.
Set this parameter to the lowest supply water temperature that will provide enough
heat for the type radiation used to function properly. Always consider the type of
radiation when adjusting this parameter.
0 Min
0 to 30 Min
Boost Time
When the Central Heat Setpoint is decreased by Outdoor Reset settings, the Boost
Time parameter is used to increase the operating setpoint when the space heat
demand is not satisfied after the Boost Time setting is exceeded. When heat demand
has been
“on” continuously for longer than the Boost Time parameter the operating
setpoint is increased by 10°F (5.6°C). The highest operating setpoint from Boost Time
is current Central Heat Setpoint minus the Central Heat
“Diff Above” setting. A setting
of 0 seconds disables this feature.
187 (ºF)
50 to 190
(ºF)
Central Heat Outdoor Air Maximum Off Point
Maximum value the setpoint can reach due to boost function. Should be set to match
Central Heat Setpoint.
187 (ºF)
50 to 190
(ºF)
Lead Lag Outdoor Air Maximum Off Point
Maximum value the setpoint can reach due to boost function. Should be set to match
Central Heat Setpoint.
