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W8835 ENVIRAZONE PANEL
68-0258—04 8
CAUTION
Equipment Damage Hazard.
Incorrect transformer wiring can damage panel.
Wire transformers in phase when one transformer
is wired to R and C and the auxiliary transformer
is wired to T1 and T2.
Fig. 12. Wiring transformer(s) to panel.
Wiring C7835 Discharge Air
Temperature Sensor
Connect wire terminals 1, 2, and 3 to the corresponding
terminals on either the W8835 EnviraZone panel or any other
EnviraCom device such as a thermostat. Refer to C7835
Installation Instructions for configuration. Multiple devices can
be wired in parallel to the each of the 1, 2, 3 terminals.
STARTUP AND CHECKOUT
1. Verify that the equipment, thermostats, transformer, and
Discharge Temperature Sensor are wired correctly. If
one transformer is powering the panel, install the XFRM
jumper. If two transformers are powering the panel, leave
the XFRM jumper in the open position.
2. Power up the W8835. Verify that all LEDs except COM
illuminate for five seconds.The board should then enter
the Purge mode with all dampers open. The damper
LEDs are green to indicate the dampers are open.
The COM LED begins to blink.
3. Press the Purge Override button to terminate the Purge
mode.
4. On the W8835 Panel, set the DIP switches.
a. Set DIP switches 1, 2, and 7 to assign the
appropriate number of heating and cooling stages.
See Tables 5 and 6.
b. Configure other DIP switches, as necessary to fit the
application. See Table 6.
5. On each thermostat, enter the Installer Setup procedures
using the VisionPRO® IAQ Installation Instructions and
assign each thermostat a zone number to correspond
with its zone damper.
6. Run Discovery by pressing the Discovery button on the
zone control panel.
7. On each thermostat, enter the Installer Setup
procedures using the Installation Instructions and config-
ure other pertinent Installer Setup options. Program the
thermostat schedule if the default settings are not
desired.
8. Run Discovery by pressing the Discovery button on the
panel.
9. Set Zone one thermostat to heat and raise the setpoint to
call for heat.
a. Verify that the heat LED is red.
NOTE: The furnace heat may not come on immedi-
ately. Allow at least 5 minutes for heat to begin
after the thermostat calls for heat.
b. Verify that Zone one LED remains green.
c. Verify that all other zone LEDs are not illuminated.
d. Change thermostat mode from Heat to Off.
10. Set Zone two thermostat to heat and raise the setpoint to
call for heat.
a. Verify that the heat LED is red.
b. Verify that Zone two LED remains green.
c. Verify that all other zone LEDs are not illuminated.
d. Change thermostat mode from Heat to Off.
11. Alternatively, set a thermostat to Cool, lower the
setpoint to call for cooling, wait five minutes, and verify
correct operation.
OPERATION
Sequence of Operation
When there is no call for heat, cool or fan, the board is in the
idle mode, indicated with no system LEDs illuminated, see
Table 3. Damper LEDs are green to indicate open. On a call for
heat, cool, or fan, the calling zone damper stays open and the
damper LED remains illuminated; the other zone dampers
close and corresponding damper LEDs do not illuminate.
The W8835 panel energizes the HVAC equipment and
conditioned air is delivered to the calling zone. The heat LED
(red), cool LED (green), or fan LED (green) illuminates to
indicate equipment operation.
The fan LED illuminates only on a call for fan; it does not
illuminate during a call for heat or cool. When the heat/cool call
is satisfied, the system enters the Purge mode, indicated by
the Purge LED (yellow). Damper positions either remain in the
same positions as at the end of the call for heat or cool
(default) or open, depending on the position of DIP switch 6.
After purge, all dampers return to the Open position.
R
C
T1
T2
CR
C
R
24 VAC, 40 VA
TRANSFORMER
(REQUIRED IF
MORE THAN
FIVE DAMPERS)
24 VAC, 40 VA
TRANSFORMER
DAMPER
XFRM
PANEL
XFRM
M31126
REMOVE XFRM JUMPERS
FROM PINS WHEN USING
TWO TRANSFORMERS