TSBC Instruction Manual
Page 32 of 48
Configuration & Tuning
Setup Menu (Continued)
Outdoor Reset Graph
Energy used by the hot water heating system can be greatly reduced by adjusting (resetting) the operating temperature
setpoint as the outdoor temperature changes. Using this approach, the heat lost from the building is matched by the
heat input to the building. The control utilizes a reset curve to set the relationship between outdoor temperature and
boiler outlet temperature setpoint. The reset curve is determined from the “Set Up” and the “Design” conditions as
shown in the above graph and described by parameters 45, 46, 47 and 48:
No.
Range / Choices
Parameter and Description
44
No
Display Only
Outdoor Reset
Outdoor Sensor
Enables the Outside Air Temperature display and control logic:
No
Outside Air Input (O+O-) is ignored.
Display Only
Do Not Calculate setpoint based on outdoor
temperature; Display Outside Air Temperature.
Outdoor Reset
Calculate the temperature setpoint based on outdoor
temperature using a reset curve defined by Outdoor
Set Up, Boiler Set Up, Outdoor Design and Boiler
Design parameters.
45
40 F to 100 F
Outdoor Set Up
The Outdoor Set Up temperature is the outdoor temperature at which the
Boiler Set Up temperature is supplied.
46
140 F to 180 F
Boiler Set Up
The Boiler Set Up Temperature is the starting boiler water temperature of
the reset ratio. If the building feels cool during mild outdoor conditions,
the Boiler Set Up setting should be increased.
47
-20 F to 50 F
Outdoor Design
The Outdoor Design Temperature is the outdoor temperature at which the
Boiler Design temperature is supplied.
48
150 F to 220 F
Boiler Design
The Boiler Design setting is the water temperature required to satisfy the
building heat loss during the Outdoor Design temperature. If the building
feels cool during cold outside conditions, the Boiler Design setting should
be increased.
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