WIRING CONNECTIONS
HeatNet Control V3
Page 82
Using a 4
–20 mA signal for direct modulation
100%
Boiler Output
0%
Boiler Off
Ignition
100%
0%
Percent of Boilers
Output
Percent of Boilers
OUTPUT
Ignition
4mA
20mA
Control Signal
Output Range From
Control
No Effect
Once boiler starts the
control signal must
drop below 4.01 mA
to stop Boiler
MAX
OUTPUT
After Ignition
0%
100%
Control Signal to MAX Output
Boiler Off
Percent of Boilers
INPUT
0ma
Display input % of control when running
A control signal greater
than 4.2mA (adjustable)
will start boiler.
PWM Duty Cycle
Blower Off
20%
Blower Fully ON
80%
100%
0%
20% = the
minimum speed
the VFD will run
20% for 5:1 boilers
25% for 4:1 boilers
33% for 3:1 boilers
33%
20%
25%
33%
20%
25%
20% for 5:1 boilers
25% for 4:1 boilers
33% for 3:1 boilers
Boiler Off
Set in
calibration
