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 hole
Mounting
screws
Power options
TH6110D
TH6110D
LR
TH6220D
E
LR
TH6320U
MCR29438A
Keep wires in this
shaded
area
Remove factoryinstalled jumper
only for twotransformer
systems.
Insert batteries for primary
or backup power.
MCR29436
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
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 cool-
ing transformer.
[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
Y
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 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]
YGAux
C
2H/2C Heat Pump
YGY2
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
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
and FAN buttons until the display
changes.
2. Press
3. Press NEXT to advance to next
4. Press DONE to exit and save
s or t to change settings.
function.
settings.
s
1
DoneNext
0
Function
number
Setting
MCR29454
Setup function Settings & options (factory default in bold)
Shaded areas below apply only to TH6320U/TH6220D or as otherwise noted.
[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
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
MCR2945
System
status
20 Emergency heating
system
30 Cooling system
40 Fan system
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
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
3-9/16” H x 5-13/16” W x 1-1/2” D
91 mm H x 147 mm W x 38 mm D
Electrical Ratings
Terminal Voltage (50/60Hz) Running Current
W Heating 20-30 Vac 0.02-1.0 A
(Powerpile) 750 mV DC 100 mA DC
W2 (Aux/E) Heating 20-30 Vac 0.02-1.0 A
Y Cooling 20-30 Vac 0.02-1.0 A
Y2 Cooling 20-30 Vac 0.02-1.0 A
G Fan 20-30 Vac 0.02-0.5 A
O/B Changeover 20-30 Vac 0.02-0.5 A
L Output 20-30 Vac 0.02-0.5 A
7
69-2695EFS-05
Customer assistance
For assistance with this product, please
visit customer.honeywell.com.
Or call Honeywell Customer Care tollfree at 1-800-468-1502.
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.