Wiring Thermostats
Run wire from the Thermostat 1, 2, 3 terminals to the
corresponding terminals on any one of the EnviraCom bus
terminal sets. More than one thermostat or other
communicating device 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.
SI NG LE TR AN SF OR ME R
H EAT IN G/COOLING SYST EM S
RE QU IR E A JU M PER TO BE
IN ST AL LE D CO NNEC TI NG RH
AND RC (FACTORY INSTALLED) .
R
W1
W2
DO TTE D LI NE S FO R 2-
ST AG E A PPL IC AT IO NS
Y1
Y2
G
C
EARD- 6
POWER-CLOSED/
SPRING-OPEN
ZD DAMPER
L
HE AT
CO OL
PU RG E
FA N
C
RH
RC
W1 /E
W2
W3/AU X
LED STATES:
Y1
Heat LED
Heating Mode
Cool LED
Cooling Mode
Y2
Purge LED
Purge Mode
Fan LED
Fan Mode
G
Em Heat LED Em Heat Mode
COMM LED
Communications
O/ B
DI P SW IT CH SE TT IN GS
HU M
1 SEE TA BL E
O N
2 SEE TA BL E
1
HU M
3 EN VI RACO M FU RN
NO
4 P URG E TI ME
2 MI N
DE HUM
5 P URG E FA N
H VA C
6 P URG E DAM PE R
N O CHG
DE HUM
7 # CO MP ST AG ES
1
8 HE AT FA N
H VA C
VE NT
9 HP CHANG EO VE R
O
10 UNU SE D
VE NT
DA MP ER S
ZONE 1
ZONE 2
ZONE 3
M6 M4 M1
M6 M4 M1
M6 M4 M1
POWER-CLOSED/
SPRING-OPEN
ZD DAMPER
1
2
POWER-CLOSED/
SPRING-OPEN
ARD DAMPER
Fig. 3. Conventional equipment wiring diagram.
5
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.
EM HE AT
CO M
ZO NE 1
ZO NE 2
W8835A
RE MO VE JU M PER S IF
T1 AND T2 ARE USED
ZONE LEDS:
On
Damper open or opening
Off
Damper closed or closing
MOMENTARY PUSH BUTTONS
Boot
Clears Microprocessor
Purge Override Bypass Purge Mode
Discovery
Initiates Discovery Mode
O
O FF
N
0
1 2 3 4 5 6 7 8 9 10
YE S
3 .5 MI N
P ANE L
#1
#2 CO NV HT ST G
OP EN
1
1
1
2
1
0
2
P ANE L
0
1
3
B
0
0
HP
E NV IR AC OM BUS
1 2 3
1 2 3
1 2 3
1
2
3
3
W8835 ENVIRAZONE PANEL
Z ON E 3
EN VI RACO M
XF RM
L1
R
R
C
C
L2
T1
24 VOLT/40 VA
T2
TR AN SF OR ME R
DAM PER
XF RM
1 2 3
1
2
3
C7835A DISCHARGE
AIR SENSOR
1
2
3
M31122
68-0258—04