Nortec SE Series - Manual (Page 42)

39 | Start Up
Nortec Digital Controls
Nortec provides optional On/Off, Modulating Control, or Transducer digital controls. Figure 38
and Figure 39 show the function and meaning of the Digital Control’s display and buttons. All
controls are available either wall mounted or with a remote sensor for duct mounting.
Figure 38: Modulating and On/Off Digital Control Operation
Modulating Control
The modulating controls use a PI control algorithm to transmit a 0-10V control signal to the
humidifier. Adjust the setpoint to the desired setting by using the up/down arrow buttons on
the controller.
On/Off Control
The On/Off controls use a PI control algorithm to open and close a relay that opens and closes
the humidifier’s On/Off loop. Adjust the setpoint to the desired setting by using the up/down
arrow buttons on the controller.
Transducer Control
The transducer controls transmit a 2-10V control signal proportional to the sensed relative
humidity to the humidifier. Humidity setpoint is not set at the transducer. The setpoint is set on
the SETC’s display and keypad.
Note: It is possible to field calibrate Nortec Digital controls if the displayed humidity is found to
be different than a known trusted source. See Digital Humidistat on page 75 of chapter
on Troubleshooting.
Output signal is shown on
modulating controller
proportional to the demand.
State of On/Off humidistat
Setpoint (RH%)
Humidity (RH %)
Indicates the
humidistat is on.
A half moon
indicates it is off.
Snowflake indicates the
setpoint is being
overridden by outdoor
temperature. Option button accesses
sensor calibration.
See troubleshooting
Increase / Decrease Setpoint
Power button turns
off the humidiistat if
pressed for 2 seconds