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W8703A DAMPER INTERFACE MODULE
LED Indicators
There are four LED on the W8703A used to indicate
damper position and system communications.
DAMPER POSITION LED
Three two-color LED on the left side of the base are red
when the W8703A is commanding the damper closed,
and green when commanding the damper open.
COMMUNICATION LED
One green LED on the right side of the base flashes
periodically to indicate that system communications are
functional.
CHECKOUT AND TEST
When power is initially applied to the W8703A, the con-
nected dampers are in the Open position.
TROUBLESHOOTING GUIDE
Symptom
No LED are on.
Panel is not powered.
Damper does not
System
open/close when
communications are
expected.
incorrectly connected.
Damper is incorrectly
connected to Damper
Interface Module.
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Possible Cause
Check for 24 Vac between TR1 and TR2 terminals; if missing 24 Vac:
Verify that system communications LED is periodically blinking; if not:
Verify correct color of LED is visible: red for Closed and green for
Open; if correct:
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To test for proper wiring of the W8703A and the associ-
ated zone dampers:
1. Make sure that the zone thermostats are not call-
ing for heating or cooling and that the thermostat
Fan setting is in the Auto position. All heating and
cooling equipment, including the system fan,
should be off. All zone dampers should be in the
Open position (status LED green).
2. Initiate a call for heating or cooling on the Zone 1
thermostat. The system should start, the Zone 1
damper should remain open and all other damp-
ers should close.
3. Initiate the same call in each of the remaining
zone thermostats. The damper in each zone
should open in response to this action.
4. Remove the call for heating or cooling in each
thermostat. The damper in each zone should
close in response to this action.
5. After all calls for heating and cooling are
removed, the system blower should stop and all
dampers should return to the Open position.
— Check if the circuit breaker is tripped; if so, reset the circuit
breaker.
— Check if the Power switch on the HVAC equipment is in the Off
position; if so, set to the On position.
— Check wiring between the thermostat and HVAC equipment—
replace any broken wires and tighten any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
— Check wiring of system. Verify that system terminals 1, 2 and 3
are correctly connected.
— Check wiring of damper. Verify that Open, Close and Com
terminals are correctly connected to damper terminals.
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post-consumer paper fibers.
Action
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