W8835A ENVIRAZONE PANEL
9
68-0258ES-1
a
An LED change precedes the corresponding relay change by as much as six seconds.
Purge Mode
At the end of every call for heat or cool, the panel enters a
Purge mode that holds open the calling zone damper for two
(default) or three and one-half minutes. During this time, the
panel or the HVAC equipment can be configured to operate the
fan.
The Purge LED lights to signal that the system is in the Purge
mode. Pressing the purge override button overrides the Purge
mode.
Unless there is a new call for heat or cool during the Purge
mode, all dampers are moved to the Open position at the end
of purge. The panel can be configured to open all dampers
during the Purge mode. If there is a call for the previous type of
conditioning during the Purge mode on non-compressor
systems, the panel immediately stops the Purge mode and
activates the equipment.
Individual Zone Fan Control
When all zones are satisfied, the fan switch of each thermostat
controls the fan operation for that zone. When the fan switch is
in the On position, the fan is energized, the fan LED illuminates
and the dampers close to zones where the fan switch is in the
Auto position. If there is a call for heat or cool during this time,
the circulation mode ceases, and the heat or cool call is
honored. When the zone calling is satisfied, and Purge mode
has ended, the circulation call resumes.
Single and Multi-Stage Conventional Heat
Operation
The panel can control up to three stages of heating and two
stages of cooling based on thermostat demand. Set DIP
switches 1 and 2 for 1, 2 or 3 stages of heat. Set DIP switch 7
for one or two stages of cooling.
Heat Pump Operation
The panel can control one or two compressor stages plus
auxiliary heat. Set DIP switch 1 and 2 to Off; set DIP switch 7
to On for a single-stage compressor and to Off for a two-stage
compressor.
Table 3. LED Indicators
a
.
LED
Color
Illuminated
Not Illuminated
Heat
Red
Heat call.
No heat calls.
Cool
Green
Cool call.
No cool calls.
Purge
Amber
Purge mode.
Not in Purge mode.
Fan
Green
Fan only call.
No fan only call.
Em Heat
Red
Emergency Heat mode.
Not in Emergency Heat mode.
Zone 1, 2, 3
Green
Damper is open or opening.
Damper is closed or closing.
DIP Switch
Number
Status
Purge Time
4
Off
3.5 minutes
4
On
2 minutes
DIP Switch
Number
Status
Fan Control
5
Off
Panel control of fan
in Purge
5
On
HVAC control of fan
in Purge
DIP Switch
Number
Status
Purge Damper
6
On
Last zone(s) calling
open during Purge
6
Off
Open all dampers
during Purge
Equipment Type
DIP 1
DIP 2
1 Stage Conventional
On
On
2 Stage Conventional
On
Off
3 Stage Conventional
Off
On
Cooling Stage
DIP7
1 Stage
On
2 Stage
Off
Equipment Type
DIP 1
DIP 2
Heat Pump
Off
Off
