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
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
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