8
Nortec EL
Electrical continued...
Safety Chain and Control Signal Connections
1. If a blower pack is installed, then connect it to terminal points “8”
and “9” on the low voltage terminal strip. Make sure that no other
wires are connected to these terminal points. If using multiple blower
packs, make sure that they are connected in series. Install a jumper
between terminal points “8” and “9” if a blower pack is not used.
2. Connect external monitoring devices (for example, high limit humi-
distat, air proving switch, etc.) in series to terminal points “1” and “2”
on the low voltage terminal strip. Install a jumper between terminal
points “1” and “2” if external monitoring devices are not used (not
recommended).
3. Connect an external humidity sensor input or direct demand
modulating input to terminal points “3” and “4” on the low voltage
terminal strip. Do not connect multiple modulating signals to the
same modulating input on the humidifier. If necessary, a second
modulating signal can be connected to terminal point “5” and “3”,
using terminal point “3” as common.
Note:
If the cable shielding is
already connected to a potential or a grounded conductor, do not
connect it to terminal point “3”.
4. If a 24 V On/Off humidistat is used, connect the input to the terminal
points “4” and “6” on the low voltage terminal strip. When connecting
a 24 V On/Off humidistat, set the jumper JP1 on the driver board to
24 V (so that terminal point “6” will output 24 VDC).
5. If an external On/Off input is used to control the humidifier, connect
it to connector X11 on the driver board.
CAUTION!
Risk of damage to internal component.
DO NOT apply voltage
to low voltage terminal strip terminal points “1” and “2” through the
contacts of the external On/Off devices.
+
max
φ
Δp
External
Blower pack
GND
10/24 Vdc
(+) Limit signal
(+) Control signal
(-) Signal
Safety loop
7
8
6
6
JP1
10V
24V
3
LV
8
7
6
5
4
3
2
9
1
5
4
2
1
1 Modulating demand or humidity sensor signal (additional)
2 Modulating demand or humidity sensor signal
3 24 V On/Off humidistat (jumper JP1 must be set to 24 V)
4 High limit humidistat
5 Air proving switch
6 Jumper
7 Low voltage terminal strip
8 Blower pack
Содержание Nortec EL005
Страница 9: ...Notes ...
