39
Planning
Nortec RS
2596995_0_EN_1905
4.4
Control System Design
The Nortec RS humidifier is designed to be regulated by an automated control system utilizing either
analog or digital signals. All analog and digital control signal cables are routed to the humidifier through
the top of the unit – refer to
. Analog control signals (refer to
"Analog Control Signals" on page 40
)
are connected to the low voltage terminal strip in the humidifier, and digital signals (see
) from a computer or the BMS are communicated directly to the integrated control
board in the humidifier using a compatible digital communication protocol.
Regardless of the type of control signals, control components for the conditioned environment will vary
primarily depending upon the steam distribution method – duct or space (refer to
and
"Space Distribution Control Design" on page 45
). All modulating input signals to the
humidifier must be of the same type – either transducers (RH sensor), or humidistats (demand signals).
IMPORTANT!
In addition to the analog or digital control signals, the 24 VAC security loop (consist-
ing of On/Off devices) connected to Pin 1 and Pin 2 on the low voltage terminal strip must be closed
for the Nortec RS humidifier to operate. Condair highly recommends the use of a high limit humidis-
tat and an air proving switch in the security loop for duct installations – refer to
.
1
5
CONTROL BOARD
4
2
3
ACCESSORY BOAR
D
REMOTE BOAR
D
DRIVER
B
DRIVER
A
BMS
LinkUp
SAB
3V
CR2032
BAT
SD
J7
J4
J8
J11
(USB)
(RJ45)
GN
D+
–
GN
D+
–
GN
D+
–
24V
GND
J10
J12
J14
J6
24VAC External Safety Loop Control signal (GND) Control signal (IN) Limit signal (IN) Control signal (V+) Limit signal (GND) Safety circuit BP Safety circuit BP
1 2 3 4 5 6 7 8 9
Figure 22: Control Signal Connections
1 Control signal cables, analog and digital
2 Digital signal from BMS – Modbus or BACnet MS/TP
3 Digital signal from BMS – BACnet IP
4 Integrated control board (located behind touchscreen display)
5 Low voltage terminal strip, for analog signals