Nortec SE Series - Manual (Page 59)

Operation | 56
(Control Settings Continued)
Multi Unit Op. Range
The SETC can be configured to network up to sixteen (10) humidifiers (or equivalent of 10,500
lb/hr) using a master slave configuration. To operate the SETC in a staged modulation system;

The humidifiers must be connected in parallel (daisy chained) using the linkup terminal (J2a)
on the SETC driver board (See Staged Modulation Wiring on page 31).

One humidifier must be designated the master and all others as slave units (see Multi Mode
on page 54 for software configuration). The master unit must be the unit to which external
controls / transducers and safety loop are connected.

Each humidifier in the system including the master must have the range of demand signal in
which it will operate configured (see below). Example, for four humidifiers with equal
capacity set the master to operate between 0% and 25%, set the fist slave for 26% to 50%,
set the second slave for 51% to 75%, and set the third slave for 76% to 100%.
The Multi Unit Op. Range submenu is used to configure the humidifier’s operating range when
Multi Mode in the User Defined Settings menu is set to either Master or Slave. The menu is not
displayed if the humidifier is set to Standalone operation. Access the Multi Unit Op. Range
submenu by pressing the menu button while Multi Unit Op. Range is highlighted in the Control
Settings menu.
Multi Unit Op. Range
Full Out sets the system demand at
which the humidifier should output
its full capacity. Zero Out sets the
system demand at which the
humidifier should shut off.
Modbus Settings
Allows configuration of
communication parameters.
Selecting an item brings up a screen
that allows the value to be changed
by using the up/down arrow keys.
Rem Disable allows the user to turn
the humidifier on if it has been
remotely disabled.
Pressure Based
Configures the humidifier to use
steam supply pressure to calculate
system output. If set to off the
output displayed is based on a
supply pressure of 15 psi.
Multi Unit Op. Range
Multi Unit Op. Range
Full Out : 20%
Zero Out : 0%
Menu Set
Full Out : 20%
Modbus Settings
Modbus Settings
Parity
: Even
Addr : 1
Timeout : 300 s
Rem Disable : On
Menu Set
Parity : Even
Press. Based : On
Pressure Based
On
Off
On
Menu Set
On
NOTE: The Multi Unit Op. Range submenu is only displayed if the humidifier has been
configured as either a Master or Slave. It is not displayed in Standalone mode.