Troubleshooting - Honeywell W8835A Manual

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.

TROUBLESHOOTING

Symptom
No LEDs are Illuminated
Damper LEDs on, but no
other LEDs illuminated.
Erratic Operation.
Heat pump operates
incorrectly or not at all.
No damper LEDs are
illuminated
Com 3 message on
thermostats
Equipment Type
1 Stage Conventional
2 Stage Conventional
3 Stage conventional
Heat Pump
Table 4. Troubleshooting.
Possible Cause
No power to the board.
Transformers out of phase.
Shorted wire.
Insufficient voltage.
Incorrect configuration.
Emergency Heat switch on.
Incorrect wiring.
Incorrect configuration.
Incorrect configuration.
Incorrect configuration
Table 5. DIP Switches 1 and 2.
DIP Switch 8
Off
On
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.
Check for 24 Vac (±10%) across R and C.
If 48 Vac across R and T1, reverse T1 and T2 wires.
Check thermal circuit breaker. If hot, a short exists in wiring.
Check for 24 Vac (±10%) across R and C.
Check jumpers and DIP switches for correct configuration.
Turn off Emergency Heat switch on thermostat.
Verify equipment terminals wiring.
Verify DIP switches configuration.
Verify that XFRM jumpers are set correctly.
Verify that DIP 3 is set correctly.
DIP 1
On (up)
On
Off
Off
11
W8835A ENVIRAZONE PANEL
Fan Control
Fan on in heat by panel.
HVAC control of fan.
Action
DIP2
On
Off (down)
On
Off
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