Delta Controls
Document Edition 4.1
Page 23 of 41
3.
VVT – [Application (AV12) = 2]
Function: Control of a simple VVT box with a Tri-State damper on Outputs 1 and 2 (for DNT-T103) or
an analog damper on Output 1 (for DNT-T221), and various options on the remaining outputs (of which
some options are no longer available in Release 3 firmware).
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
Tri-State
Damper - Cool
(Open)
Tri-State
Damper - Cool
(Close)
Heating 1
Room Temp.
N/A
Optional OAT
Tri-State
Damper - Cool
(Open)
Tri-State
Damper - Cool
(Close)
Fan
Room Temp.
N/A
Optional OAT
Tri-State
Damper - Cool
(Open)
Tri-State
Damper - Cool
(Close)
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
Analog Damper
(Cooling 1)
Heating 1
Heating 2
Room Temp.
N/A
Optional OAT
Analog Damper
(Cooling 1)
Heating 1
Fan
Room Temp.
N/A
Optional OAT
Analog Damper
(Cooling 1)
Heating 1
None
(MUX)
Room Temp.
N/A
Optional OAT
Analog Damper
(Cooling 1)
None
(MUX)
None
(MUX)
Room Temp.
N/A
Optional OAT
Analog Damper
(Cooling 1)
None
(MUX)
Fan
N
OTE
: For fan-powered boxes series fans should always be configured for continuous
operation – never intermittent or the fan could run backwards on startup. And, in order for
a parallel fan to be properly sequenced it should generally be configured as the 1st stage of
heating (and wired to OP1), rather than as a fan.
Setup Parameters
Setup Variable
Function
Notes
AV24
Damper Runtime (Tri-state or Analog)
Default of 120 seconds
AV25
N/A
AV26
Damper Minimum
Damper Minimum Position
AV27
Damper Maximum
Damper Maximum Position
AV28
PWM minimum value or Binary On Delay
(or Binary Off Delay for a Fan)
Depends on OP3 configuration
AV29
PWM maximum value or Time Proportioned
Heating Controller Limit
Depends on OP3 configuration
