DNT-T103 & DNT-T221 Application Guide
Page 24 of 41
Document Edition 4.1
Sequence of Operation
The current damper position is generated from the Cooling Minimum setpoint, Cooling Maximum
Setpoint and the Cool 1 value.
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 14 for operating information on Box Mode and
Controller Operation.
4.
H
EAT
P
UMP
U
NIT
(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)
