Honeywell envirazone panel w8835 User Manual

68-0258—04

8

Wire transformers in phase when one transformer 

is wired to R and C and the auxiliary transformer 

is wired to T1 and T2.

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.

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.

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

C R

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