Startup And Checkout; Operation - Honeywell W8835A Manual

W8835A ENVIRAZONE PANEL
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.
PANEL
XFRM
R
C
T1
T2
DAMPER
XFRM
Fig. 13. 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.

STARTUP AND CHECKOUT

1. Verify that the equipment, thermostats, transformer, and
Discharge Temperature Sensor are wired correctly.
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 each thermostat, enter the Installer Setup
procedures using the T8635L Installation Instructions.
a. Assign each thermostat a zone number to
correspond with its zone damper.
b. If an outdoor temperature sensor is used, configure
the thermostat with the sensor wired to it.
c. Configure any other pertinent Installer Setup options.
But do not configure equipment stages using installer
setup.
d. Press Run Program on the T8635 and change the
thermostat schedule if the default settings are not
desired.
5. On one of the thermostats:
a. Set the filter duration. See T8635 Owner's Manual.
b. Set the time and day.
68-0258ES-1
24 VAC, 40 VA
Transformer
R
C
C R
24 VAC, 40 VA
Transformer
(Required if
more than
four dampers)
M20518
6. 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.
c. 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.
7. Run Discovery.
8. 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.
9. 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.
10. 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 circulation; 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.
COM LED Operation
The green COM LED flickers as the W8835 communicates
with the other EnviraCom devices:
LED blinks rapidly—indicates device is currently
transmitting information on the communications bus.
LED blinks once—indicates device received and
acknowledged a message.
LED on constantly— indicates panel failure. Replace panel.
LED off constantly—indicates a wiring problem.
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