Remove the wallplate from the thermostat, then follow
directions below for mounting.
1. Remove battery holder.
2. Pull here to remove wallplate from new thermostat.
3. Pull wires through wire hole.
4. Position wallplate on wall, level and mark hole
positions with pencil.
5. Drill holes at marked positions as shown below, then
tap in supplied wall anchors.
6. Place wallplate over anchors, insert and tighten
mounting screws.
7. Insert reference card.
®
Series
Drill 3/16"
holes for
drywall.
Drill 7/32"
holes for
plaster.
Wire holeMounting
screws
Power options
TH6110D
TH6110D
LR
TH6220D
E
LR
TH6320U
MCR29438A
Keep wires in this
shaded
area
Remove factoryinstalled jumper only
for two-transformer
systems.
Insert batteries for primary
or backup power.
Connect C for primary AC power (optional
if batteries are installed).
Wiring terminal designations
Shaded areas below apply only to TH6320U/TH6220D or as otherwise noted.
Conventional Terminals:
Rc 24VAC power from cooling
transformer
R 24VAC power from heating
transformer
W Heat relay (stage 1)
W2 Heat relay (stage 2)
Y Compressor contactor (stage 1)
Y2 Compressor contactor (stage 2)
G Fan relay
C 24VAC common. For 2 transformer
G Fan relay
Aux/E Auxiliary/Emergency heat relay
L Sends output when set to Em. Heat
C 24VAC common
MCR29436
RcYWGRC
TH6220D
TH6320U
RcYGRC
G
RcYWGW2Y2RC
RcYWGW2Y2RC
Aux
E
Y2
C
RcY
RcYGAux
C
2
Wiring conventional systems
RcYWGRC
RcWRC
RcYWRC
RcYRC
RcYWGRC
RcWGRC
RcYGRC
RcYWGW2Y2RC
RcYWGW2Y2RC
Shaded areas below apply only to TH6320U/TH6220D or as otherwise noted.
1H/1C System
(1 transformer)
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
W Heat relay
G Fan relay
Heat-only System
Rc Power [1]
R [R+Rc joined by jumper]
C 24VAC common [3]
W Heat relay
Heat-only System
(Series 20) [5]
Rc [R+Rc joined by jumper]
R Series 20 valve terminal “R” [1]
Y Series 20 valve terminal “W ”
C 24VAC common [3]
W Series 20 valve terminal “B”
Heat-only System
(normally open zone
valve) [5]
Rc [R+Rc joined by jumper]
R Power [1]
Y Normally open zone valve
C 24VAC common [3]
1H/1C System
(2 transformers)
Rc Power (cooling transformer) [1, 2]
R Power (heating transformer) [1, 2]
Y Compressor contactor
C 24VAC common [3, 4]
W Heat relay
G Fan relay
Heat-only System
with Fan
Rc Power [1]
R [R+Rc joined by jumper]
C 24VAC common [3]
W Heat relay
G Fan relay
Cool-only System
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
G Fan relay
2H/2C System
(1 transformer) [6]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor (stage 1)
C 24VAC common [3]
W Heat relay (stage 1)
G Fan relay
W2 Heat relay (stage 2)
Y2 Compressor contactor (stage 2)
2H/2C System
(2 transformers) [6]
Rc Power (cooling transformer) [1, 2]
R Power (heating transformer) [1, 2]
Y Compressor contactor (stage 1)
C 24VAC common [3, 4]
W Heat relay (stage 1)
G Fan relay
W2 Heat relay (stage 2)
Y2 Compressor contactor (stage 2)
NOTES
Wire specifications:
Use 18 to 22-gauge thermostat wire.
Shielded cable is not required.
[1] Power supply. Provide disconnect means and overload
protection as required.
[2] Remove jumper for 2-transformer systems.
[3] Optional 24VAC common connection.
[4] Common connection must come from cooling trans-
former.
[5] In Installer Setup, set system type to
Heat Only.
[6] In Installer Setup, set system type to 2Heat/2Cool
Conventional.
[7] In Installer Setup, set changeover valve to O or B.
[8] In Installer Setup, set system type to 2Heat/1Cool
Heat Pump.
[9] In Installer Setup, set system type to 2Heat/2Cool
Heat Pump.
[10] In Installer Setup, set system type to 3Heat/2Cool
Heat Pump.
[11] L terminal sends a continuous output when thermostat
is set to Em. Heat. Connect to Honeywell zoning panels
to switch the panel to Emergency Heat.
3
MCR29453
Rc
E
LR
Rc
E
LR
Rc
LR
Rc
E
LR
Wiring heat pump systems
Rc
GR
Shaded areas below apply only to TH6320U/TH6220D or as otherwise noted.
1H/1C Heat Pump
System
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
C
2H/1C Heat Pump
System (TH6220D
YGAux
C
only) [8]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Aux/E Auxiliary/Emergency heat relay
L Sends output when set to Em. Heat [11]
2H/1C Heat Pump
System (TH6320U
C
only) [8]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Aux/E Auxiliary/Emergency heat relay
L Sends output when set to Em. Heat [11]
2H/2C Heat Pump
YGY2
Y
System (TH6320U
C
only) [9]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor (stage 1)
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
Y2 Compressor contactor (stage 2)
L Sends output when set to Em. Heat [11]
3H/2C Heat Pump
System (TH6320U
only) [10]
Rc Power [1]
R [R+Rc joined by jumper]
Y Compressor contactor (stage 1)
C 24VAC common [3]
O/B Changeover valve [7]
G Fan relay
YGAux
Aux/E Auxiliary/Emergency heat relay
Y2 Compressor contactor (stage 2)
L Sends output when set to Em. Heat [11]
See Notes on page 3.
Y2
YGAux
C
Thermostat mounting
1. Push excess wire back into the wall
opening.
2. Plug wall opening with non-flammable
insulation.
3. Align the 4 tabs on the wallplate with
corresponding slots on the back of the
thermostat.
4. Push gently until the thermostat snaps in
place.
4
1
0
DoneNext
MCR29454
Installer setup
Follow the procedure below to configure the
thermostat to match the installed heating/cooling
system, and customize feature operation as desired.
1. To begin, press and hold the sand FAN
buttons until the display changes.
2. Press s or t to change settings.
3. Press NEXT to advance to next function.
4. Press DONE to exit and save settings.
1
DoneNext
Function
number
Setup function Settings & options (factory default in bold)
Shaded areas below apply only to TH6320U/TH6220D or as otherwise noted.
1System type
2Changeover valve
(O/B terminal)
3Fan control
(heating)
5Stage 1 heat cycle
rate
(CPH: cycles/hour)*
6Stage 2 heat cycle
rate/Auxiliary heat
cycle rate (CPH)*
0 1 heat/1 cool conventional
1 1 heat/1 cool heat pump (no aux. heat)
2 Heat only — 2-wire systems, 3-wire zone valves (Series 20), and normally
open zone valves
3 Heat only with fan
4 Cool only
5 2 heat/1 cool heat pump (with aux. heat)
6 2 heat/2 cool conventional
7 2 heat/1 cool conventional
8 1 heat/2 cool conventional
9 2 heat/2 cool heat pump (no aux. heat) - TH6320U only
10 3 heat/2 cool heat pump (with aux. heat) - TH6320U only
0 Changeover valve (O/B terminal energized in cool-
ing)
1 Changeover valve (O/B terminal energized in heating)
0 Gas or oil furnace — equipment controls fan in
heating
1 Electric furnace — thermostat controls fan in heating
5 For gas or oil furnaces of less than 90% efficiency
1 For steam or gravity systems
3 For hot water systems & furnaces of over 90% efficiency
9 For electric furnaces
5 For gas or oil furnaces of less than 90% efficiency
1 For steam or gravity systems
3 For hot water systems & furnaces of over 90% efficiency
9 For electric furnaces
[Other options: 40 °F to 89 °F (4.5 °C to 31.5 °C)]
50 Min. cool temperature setting is 50 °F (10 °C)
[Other options: 51 °F to 99 °F (10.5 °C to 37 °C)]
Special function
Auto Changeover (Setup Function 12): When set to Auto, the thermostat automatically selects
heating or cooling depending on the indoor temperature. The thermostat will automatically adjust heat
and cool settings to maintain a 3-degree separation (fixed). Note: If you select Auto Changeover Only,
the System Setting on the thermostat will stay locked in the Auto position, preventing the user from
changing it to Em Heat, Heat, Cool or Off.
Adaptive Intelligent Recovery™ (Setup Function 13): Allows the thermostat to “learn”
how long the furnace and air conditioner take to reach programmed temperature settings, so the
temperature is reached at the scheduled time.
Compressor Protection (Setup Function 15): Forces the compressor to wait a few minutes
before restarting, to prevent damage. During the wait time, the message Cool On or Heat On (heat
pumps only) will flash on the display.
6
5
10
0
Installer system test
1. To begin, press and hold the s and t
buttons until the display changes.
2. Press s / t to turn system on/off.
3. Press NEXT to advance to next test
4. Press DONE to terminate system test.
10
System test
number
System test System status
Shaded areas below apply only to TH6320U/TH6220D or as otherwise noted.
10 Heating system
20 Emergency heating
system
30 Cooling system
40 Fan system
Specifications
Temperature Ranges
Heat: 40° to 90°F (4.5° to 32°C)
Cool: 50° to 99°F (10° to 37°C)
Operating Ambient Temperature
32° to 120°F (0° to 48.9°C)
Shipping Temperature
20° to 120°F (28.9° to 48.9°C)
Operating Relative Humidity
5% to 90% (non-condensing)
Physical Dimensions
39/16” H x 513/16” W x 11/2” D
91 mm H x 147 mm W x 38 mm D
0 Heat and fan turn off.
1 Stage 1 heat turns on. Fan turns on if Setup Function 1 is set to 1, 5, 9 or
10 OR Setup Function 3 is set to 1
2 Stage 2 heat turns on
3 Stage 3 heat turns on - TH6320U only
0 Heat and fan turn off
1 Heat and fan turn on
0 Compressor and fan turn off
1 Compressor and fan turn on
2 Stage 2 compressor turns on
0 Fan turns off
1 Fan turns on
Electrical Ratings
Terminal Voltage (50/60Hz) Running Current
W Heating 2030 Vac 0.021.0 A
(Powerpile) 750 mV DC 100 mA DC
W2 (Aux/E) Heating 2030 Vac 0.021.0 A
Y Cooling 2030 Vac 0.021.0 A
Y2 Cooling 2030 Vac 0.021.0 A
G Fan 2030 Vac 0.020.5 A
O/B Changeover 2030 Vac 0.020.5 A
L Output 2030 Vac 0.020.5 A
System
status
0
MCR2945
7
69-2695EFS-07
Customer assistance
For assistance with this product, please visit
customer.honeywell.com.
Or call Honeywell Customer Care toll-free at
18004681502.
CAUTION:
EQUIPMENT DAMAGE HAZARD
Compressor protection is bypassed during testing. To prevent equipment damage, avoid
cycling the compressor quickly.
CAUTION:
ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before beginning
installation.
Pull at bottom to
remove thermostat
from wallplate.
Turn thermostat over to
find model number and
date code.
CAUTION:
MERCURY NOTICE
If this product is replacing a control that contains mercury in a sealed tube, do not place
the old control in the trash. Contact your local waste management authority for instructions
regarding recycling and proper disposal.
Home and Building Technologies
In the U.S.:
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422-3992
customer.honeywell.com