DNT-T221-FCU Application Guide
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0.59 Sec.
2.93 Sec.
0%
100%
If the output using PWM is also configured as reverse acting then the output device will be considered
to be reverse acting (i.e., Normally Open) and the input value will be inverted internally before being
applied to the physical output. The actual action of the physical output will be direct.
If the PWM output is not being used for a Belimo device then the minimum and maximum values can
be changed to what is required. Also, Belimo actuators may be configured to use a 0.5 to 25.5 signal
instead, which may be more suitable in many cases (i.e., variable values of 50 and 2550).
Physical
Output
Associated Output
AV
Min. Setup
Variable
Max. Setup
Variable
OP3
AV3
AV28
AV29
The value (in seconds) is shifted by two decimal places when entered in the variable. Default values
are,
Minimum PWM Value = 59
Maximum PWM Value = 293
Fan Control
There are three modes of operation: Manual, Multi, or Variable
Fan Type
Occupied Mode
Unoccupied Mode
Manual Fan
Fan On and Off and Speed
controlled by user button
presses.
Low speed when the Controller
is not in deadband for night
setback. Off otherwise.
Multi-speed constant
fan
Low speed when the controller
is in deadband and the fan will
sequence through the fan
speeds.
Low speed when the Controller
is not in deadband for night
setback. Off otherwise.
Multi-speed intermittent
fan
Low speed when the controller
is not in deadband and the fan
will sequence through the fan
speeds. Off in deadband.
Low speed when the Controller
is not in deadband for night
setback. Off otherwise.
Variable-speed
constant fan
Minimum speed when the
controller is in deadband and
the fan will sequence through
the fan speeds.
Minimum speed when the
Controller is not in deadband for
night setback. Off otherwise.
Variable-speed
intermittent fan
Low speed when the controller
is not in deadband and the fan
will sequence through the fan
speeds. Off in deadband.
Minimum speed when the
Controller is not in deadband for
night setback. Off otherwise.
Analog
The DNT-221-FCU supports two analog outputs, which provide a modulating 0 to 10v signal.
