Delta Controls BACstat II Series User Manual

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Page 14 of 35
Document Edition 3.1
2. CONTROLLER OPERATION
Heating
Setpoint
-100%
Cooling
Heating
Day Setpoint
Cooling
Setpoint
Day
Differential
Deadband
Proportional BandProportional Band
Controller
Output
(Cooling)
0%
100%
Controller
Output
(Heating)
0% Temperature
NORMAL CONTROLLER ACTION
Deadband is a span of 0.2 around setpoint (heating or cooling) over which neither heating nor cooling takes place.
Here are a few rules and restrictions to how the internal Loop Controller functions:
• Heating and Cooling will not be O
N at the same time
• If the Input temperature is less than (Day Setpoint – (Day Differential – ½ Deadband)) then the controller is
in H
EATING
• If the Input temperature is greater than (Day Setpoint + (Day Differential + ½ Deadband)) then the controller
is in C
OOLING
• If the Input temperature is between these two extents for Heating and Cooling, then the controller is in
A null
zone
For all control applications (except when Box Mode is heating in VAV or VVT) the Controller Status (AV14)
will modulate from -100 to 100% and sequence any necessary output stages. A value of 0 to 100% represents
heating output from the controller, while a value of 0 to -100% represents cooling output from the controller.
Heating
Setpoint
Flow
Damper
Auxilary
Heating
Day Setpoint
Cooling
Setpoint
Day
Differential
Deadband
Proportional BandProportional Band
100%
Controller
Output
0% Temperature
200%
WITH BOX MODE = HEATING

Delta Controls BACstat II Series Specifications

General

Brand	Delta Controls
Model	BACstat II Series
Category	Thermostat
Language	English