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The Auxiliary Input port is labeled DI on the side of the case.
Power for the Auxiliary Input (AUX-IN) may be drawn from an
active communication channel (terminals 2 and 3) or a
separate 24Vac transformer if no communications channel is
used. See Fig. 7 and 8.
Connect the AUX-IN terminal to an optional normally closed
(N.C.) sensor contact that fulfills the desired function. The
Auxiliary Input terminals accept a voltage input of 18-30 Vac/
dc. Power to the Auxiliary Input represents a normal, non-
alarm condition, while a loss of power to the contacts
represents an alarm condition.
The Auxiliary Input accepts up to 30 Vac or Vdc presenting no
more than a 10 mA load.
AUXILIARY OUTPUT (AUX-OUT)
The Auxiliary Output closes in the event an alert condition is
detected from the W8735G or from the Auxiliary Input. The
Auxiliary Output (dry) contacts remain closed until the alert
condition is cleared. Use the Auxiliary Output terminals to
interface with a lamp or buzzer to locally indicate an alert
condition (see Fig. 13) or connect to a residential security
panel in order to integrate the HVAC alerts to the home
security system (see Fig. 12).
The Auxiliary Output is a normally open, dry contact that
supports a load current of up to 1 A. A closed output indicates
an alert condition. The auxiliary output port is labeled DO on
the side of the case.
NOTE: The Auxiliary Output is "made" on all alert conditions
and is deactivated when the alert is cleared from the
communication bus.
IMPORTANT
Make sure the current draw through the Auxiliary
Output terminals does not exceed specifications.
Use relays or contactors to integrate to line voltage
devices.
AUXILIARY TERMINALS
AUX-IN
AUX-OUT
Fig. 6. AUX-IN and AUX-OUT Terminals (located on the
main circuit board).
Auxiliary Input and Output
Applications
AUXILIARY INPUT (AUX-IN) TERMINAL
• Connect the Auxiliary Input (AUX-IN) terminals to a
normally closed dry contact sensor, drawing power from an
active EnviraCOM channel or external transformer. See
Fig. 7.
• Connect the Auxiliary Input (AUX-IN) terminals to a
normally closed contact sensor, drawing 24 V power from
an external power supply. See Fig. 8.
• For multiple sensors, connect in series to enunciate any
condition on the AUX-IN loop. See Fig. 9.
• For multiple sensors, connect in parallel to annunciate an
"AND" condition on the AUX-IN loop. See Fig. 10.
• Connect a 24 Vac/dc sensor. See Fig. 11.
AUXILIARY OUTPUT (AUX-OUT) TERMINAL
• Connect the N.O. Auxiliary Output terminals to an optional
home alarm system or other local alert enunciation device.
See Fig. 12.
• Use a 24 Vac relay if the enunciating device operates at
line voltage. See Fig. 13.
AUXILIARY SENSOR
(DRY CONTACTS)
1
POWER FROM THE AUXILIARY INPUT MAY BE DRAWN FROM AN ACTIVE
COMMUNICATION CHANNEL AS SHOWN (2/R AND 3/B).
Fig. 7. Wiring Normally Closed Contact Sensor to the
M29962
5
W8735G COMMUNICATION GATEWAY
AUX-IN Terminal Block (Channel Powered).
1
1/D
2/R
CHANNEL 1
3/B
1/D
2/R
CHANNEL 2
3/B
OUTPUT
AUXILIARY
INPUT
M23752
69-2432—01
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