W8835A ENVIRAZONE PANEL
11
68-0258ES-1
Circuit Breaker Protection
A built-in thermal circuit breaker protects the EnviraZone panel
against shorts in the damper wiring and EnviraCom bus. It
does not protect against shorts in the HVAC equipment wiring
into the panel.
When the circuit breaker is tripped, none of the LEDs illuminate
and the yellow rectangular component located bottom center
on the panel is hot to touch.
• Remove power to the panel for at least five minutes to allow
the circuit breaker to cool off and reset.
• To eliminate the short, verify the dampers and transformer
wiring.
Fan On In Heat
The system blower can be set to come on with a call for heat
as required for hydro-air or electric heat systems. Set the
blower function using DIP switch 8. When configured for heat
pump, this DIP switch is not used.
Adding Additional Zones
Connect one W8703 to the EnviraCom bus to expand the
system up to six zones or connect two W8703 to control up to
nine zones:
• Wire the first three zone dampers and thermostats to the
W8835 Envirazone Panel.
• Wire the additional dampers to the W8703 panels.
• Set the DIP switches on the W8703 to correspond to the
zones being controlled. See W8703 Installation Instructions.
• Wire terminals 1, 2, and 3 from the additional thermostats to
terminals 1, 2, and 3 on any of the panels.
TROUBLESHOOTING
DIP Switch 8
Fan Control
Off
Fan on in heat by panel.
On
HVAC control of fan.
Table 4. Troubleshooting.
Symptom
Possible Cause
Action
No LEDs are Illuminated
No power to the board.
Check for 24 Vac (±10%) across R and C.
Transformers out of phase.
If 48 Vac across R and T1, reverse T1 and T2 wires.
Shorted wire.
Check thermal circuit breaker. If hot, a short exists in wiring.
Damper LEDs on, but no
other LEDs illuminated.
Insufficient voltage.
Check for 24 Vac (±10%) across R and C.
Incorrect configuration.
Check jumpers and DIP switches for correct configuration.
Erratic Operation.
Emergency Heat switch on.
Turn off Emergency Heat switch on thermostat.
Heat pump operates
incorrectly or not at all.
Incorrect wiring.
Verify equipment terminals wiring.
Incorrect configuration.
Verify DIP switches configuration.
No damper LEDs are
illuminated
Incorrect configuration.
Verify that XFRM jumpers are set correctly.
Com 3 message on
thermostats
Incorrect configuration
Verify that DIP 3 is set correctly.
Table 5. DIP Switches 1 and 2.
Equipment Type
DIP 1
DIP2
1 Stage Conventional
On (up)
On
2 Stage Conventional
On
Off (down)
3 Stage conventional
Off
On
Heat Pump
Off
Off
