Advertisement
Available languages
Available languages
Wiring Thermostats
Run wire from the T8635L Thermostat 1, 2, 3 terminals to the
corresponding terminals on any one of the EnviraCom bus
terminal sets. More than one thermostat can be connected to a
bus terminal. See Fig. 3.
Wiring Equipment
CONVENTIONAL EQUIPMENT
Connect the first stage heat to W1/E, second stage heat to W2,
and third stage heat to W3/Aux. Wire first stage cooling to Y1,
and second stage cooling to Y2. See Fig. 3.
Single transformer heating/cooling
systems require a jumper to be
installed connecting R
(factory installed).
HVAC Equipment
Heating Transformer
24 VAC
Equipment
Cooling Transformer
First Stage Heating
Second Stage Heating Relay
Third Stage Heating
First Stage Cooling Relay
Second Stage Cooling Relay
Fan Relay
Auxiliary Equipment
Humidifier
Humidifier
Dehumidifier
Dehumidifier
This diagram shows the typical
equipment, thermostat, and
damper motor connections.
For specific wiring,
refer to the Installation
Instructions.
If the heat pump equipment has an L terminal that is energized
on heat pump failure, connect it to the L equipment terminal
and wire C on the left side of the panel to the HVAC common
terminal. When the L terminal is energized, the thermostats
and R
H
C
HEAT
COOL
L
C
Rh
Rc
W1/E
LED STATES:
W2
Heat LED
Cool LED
W3/AUX
Purge LED
Fan LED
Y1
Em Heat LED Em Heat Mode
Y2
COMM LED
G
O/B
DIP SWITCH SETTINGS
1 SEE TABLE
2 SEE TABLE
3 ENVIRACOM FURN
HUM
4 PURGE TIME
HUM
5 PURGE FAN
6 PURGE DAMPER
DHUM
7 # COMP STAGES
DHUM
8 HEAT FAN
9 HP CHANGEOVER
Ventilator
VENT
10 UNUSED
Ventilator
VENT
DAMPERS
ZONE 1
ZONE 2
M6
M4 M1
M6 M4 M1
4
5
6
Z
1
2
3
X
Power-open/
Power-closed/
Power-closed
Spring-open
(Opposed Blade
(Model ZD)
Damper Motors)
Fig. 3. Conventional equipment wiring diagram.
If separate HVAC equipment transformers are used for the
heating and cooling systems, such as for an oil furnace, wire
the heating transformer hot wire to Rh and the cooling
transformer hot wire to Rc. Locate the Rh/Rc jumper above the
equipment terminals and remove the jumper to expose the two
pins.
HEAT PUMP EQUIPMENT
Connect the Y1 terminal to the first stage compressor, and the
Y2 terminal to the second stage compressor. W3/Aux is the
auxiliary heat and W1/E is the emergency heat. If emergency
heat and auxiliary heat use the same piece of equipment,
place a jumper from W3/Aux to W1/E and wire it to the resistive
heat equipment. See Fig. 4 and 5. See Fig. 6 and 7 for two-
stage heat pump equipment.
PURGE
FAN
EM. HT.
COMM
ZONE 1
DISCOVERY
BOOT
ZONE LEDS:
Heating Mode
On
Damper open or opening
Cooling Mode
Off
Damper closed or closing
Purge Mode
MOMENTARY PUSH BUTTONS
Fan Mode
Boot
Clears Microprocessor
Purge Override Bypass Purge Mode
Communications
Discovery
Initiates Discovery Mode
O
ON
OFF
N
1
0
1
2 3 4 5 6 7 8 9 10
NO
YES
2.0 MIN
3.5 MIN
HVAC
PANEL
#1 #2 CONV HT STG
NO CHG
OPEN
1
2
1
1
1
HVAC
PANEL
1
0
2
O
B
0
1
3
0
0
HP
ENVIRACOM BUS
ZONE 3
M6 M4 M1
1 2 3
1 2 3
1 2 3
1 2 3
(can connect to any set of 1,2,3 terminals)
ZONE DAMPER MOTORS
M1 - common
M4 - power open
Power-closed/
M6 - power closed
Spring-open
(Model ARD)
illuminate the red Em Heat light. If a W8735B Telephone
Access Module is connected to the EnviraCom bus, it also
dials out.
5
W8835A ENVIRAZONE PANEL
ZONE 2
ZONE 3
PURGE
OVERRIDE
XFRM
Jumpers
Jumpers are shipped
in open position.
Attach them when
panel is powered by
one transformer.
C R
Enviracom
XFRM
24 VAC, 40 VA
R
Panel
C
Transformer
T1
T2
Damper
XFRM
C R
1 2 3
1 2 3
24 VAC, 40 VA
Optional
Transformer
1 2 3
1 2 3
(required if
system load
is greater
than single
transformer
output.)
M23064
68-0258ES-1
Advertisement
