Delta Controls BACstat II Series User Manual

Delta Controls
Document Edition 3.1
Page 21 of 35
Sequence of Operation
The current damper position is generated from the Cooling Minimum setpoint, Cooling Maximum Setpoint and
the Cool 1 value as shown on the next page.
Damper Position
Max
Damper
Position
Min
Damper
Position
Controller Output (Cooling 1)
0
Max Damper Position
0% 100%
For the DNT-T103 the desired damper position is compared to the current estimated damper position by the Tri-
State controller loop. The Tri-State damper outputs (1 & 2) are used to control the damper and adjust the
estimated position to match the current desired position. The rate of the damper from closed to open is adjusted
using AV24 – Damper Run Time (seconds). The default value is 120 seconds. On the DNT-T221, the analog
damper output 1 is used to control damper position, but also requires a runtime value set in AV24.
In Unoccupied Deadband mode the damper position is set to zero.
Output 3 may be selected as a fan, which would operate according to the above table. Alternatively, the output
may be selected to be Heating 1 or supplementary cooling 2, which may be of type Binary or PWM or Timed
Proportional. Also refer to page 13 for operating information on Box Mode and Controller Operation.
4. H
EAT PUMP UNIT (HPU) – [Application (AV12) = 3]
Function: Control of a single-stage Heat Pump Unit with reversing valve and optional fan.
DNT-T103 I/O (Outputs 1 to 3 are Triacs)
Input AI1 Input AI2 Input AI3 Remote AV5 Output 1 Output 2 Output 3
Room Temp. N/A Optional OAT Compressor Reversing
Valve
Heating 2
Room Temp. N/A Optional OAT Compressor Reversing
Valve
Cooling 2
Room Temp. N/A Optional OAT Compressor Reversing
Valve
Fan
Room Temp. N/A Optional OAT Compressor Reversing
Valve
None
(MUX)
DNT-T221 I/O (Outputs 1 & 2 are Analog, and Output 3 is a Triac)
Input AI1 Input AI2 Input AI3 Remote AV5 Output 1 Output 2 Output 3
Room Temp. N/A Optional OAT Compressor
(0/10v)
Reversing
Valve (0/10v)
Heating 2
Room Temp. N/A Optional OAT Compressor
(0/10v)
Reversing
Valve (0/10v)
Cooling 2
Room Temp. N/A Optional OAT Compressor
(0/10v)
Reversing
Valve (0/10v)
Fan
Room Temp. N/A Optional OAT Compressor
(0/10v)
Reversing
Valve (0/10v)
None
(MUX)

Delta Controls BACstat II Series Specifications

General

Brand	Delta Controls
Model	BACstat II Series
Category	Thermostat
Language	English