Mounting Thermostat On Wallplate - Honeywell T8635L Installation Instructions Manual

Single transformer heating/cooling
systems require a jumper to be
installed connecting R
(factory installed).
HVAC Equipment
HP Fault
HP Fault Common
Heating Transformer
24 VAC
Equipment
Cooling Transformer
First Stage Heating/Emergency Heat Relay
Second Stage Heating Relay
Third Stage Heating/Auxiliary Heat Relay
First Stage Cooling Relay
Second Stage Cooling Relay
Fan Relay
Reversing Valve (Cooling/Heating)
Auxiliary Equipment
Humidifier
Humidifier
Dehumidifier
Dehumidifier
Ventilator
Ventilator
This diagram shows the typical
equipment, thermostat, and
damper motor connections.
For specific wiring,
refer to the Installation
Instructions.
Golden Valley, MN 55422
www.honeywell.com/yourhome

Mounting Thermostat on Wallplate

NOTE: To remove the thermostat from the wall, first
pull out at the bottom of the thermostat;
remove the top last.
1. Engage tabs at the top of the thermostat and wall-
plate. See Fig. 9.
2. Press the lower edge of the case to close and
latch.
T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT
and R
H C
HEAT COOL
L
C
Rh
Rc
W1/E
LED STATES:
W2 Heat LED
Cool LED
W3/AUX
Purge LED
Y1 Fan LED
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
VENT
10 UNUSED
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. 8. W8835 EnviraZone Panel wiring.
PURGE FAN EM. HT. COMM ZONE 1 ZONE 2 ZONE 3
DISCOVERY
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
N
ON OFF
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
M6 - power closed
Power-closed/
Spring-open
(Model ARD)
A.
B.
Fig. 9. Mounting thermostat on wallplate.
5
PURGE
BOOT OVERRIDE
XFRM
Jumpers
Attach jumpers
(factory installed
in open position)
if using only
one transformer.
Enviracom
XFRM
R
C
T1
T2
Damper
XFRM
1 2 3 1 2 3
24 VAC, 40 VA
1 2 3 1 2 3
ENGAGE TABS
AT TOP OF
THERMOSTAT
AND WALLPLATE.
PRESS LOWER
EDGE OF CASE
TO LATCH.
C R C R
24 VAC, 40 VA
Optional Panel
Transformer Transformer
(required if
system load
is greater
than single
transformer
output.)
TM
32003618-009
M20850A
REV. B
M14628
69-1331—5