Table of Contents
Advertisement
XII. Operation
F. Changing Adjustable Parameters (continued)
"Press"
Factory
Range / Choices
Setting
Enabled
Enable Disable
0°F
-40°F to 100°F
(-40°C to 37.8°C)
(-18°C)
70°F
32°F to 100°F
(21.1°C)
(0°C to 37.8°C)
110°F
70°F to 190°F
(43.3°C)
(21.1°C to 87.8°C)
0-1800 Seconds
20 Minutes
(0-30 Minutes)
107672-03 - 5/18
button to access the following parameters:
Auxiliary Heat Outdoor Reset Enable
If an outdoor sensor is installed and Outdoor Reset is Enabled, the boiler will automatically
adjust the heating zone set point temperature based on the outdoor reset curve in Figure
8. The maximum set point is defined by the Central Heat Setpoint [factory set to 180°F
(82.2°C)] when the outdoor temperature is 0°F (-18°C) or below. The minimum set point
temperature shown is 130°F (54.4°C) [adjustable as low as 80°F (26.7°C)] when the
outdoor temperature is 50°F (10°C) or above. As the outdoor temperature falls the supply
water target temperature increases. For example, if the outdoor air temperature is 30°F,
(-1.1°C) the set point temperature for the supply water is 150°F (65.6°C).
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.
Auxiliary Heat Low Outdoor Temperature
The Low Outdoor Temperature parameter is also called "Outdoor Design Temperature".
This parameter is the outdoor temperature used in the heat loss calculation. It is typically
set to the coldest outdoor temperature.
Auxiliary Heat High 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.
Auxiliary Heat Low Boiler Water Temperature
The Low Boiler Water Temperature parameter is the operating setpoint when the High
Outdoor Temperature is measured. If the home feels cool during warm outdoor conditions,
the Low Boiler Water Temperature parameter should be increased.
Auxiliary Heat Boost Time
When the Auxiliary Heat Setpoint is decreased by Outdoor Reset settings, the Boost Time
parameter is used to increase the operating setpoint when the home 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 Auxiliary Heat
Setpoint. A setting of 0 seconds disables this feature.
Parameter and Description
129
Advertisement
Table of Contents
