Honeywell Heat Pump T8411R User Manual
T8411R Electronic  
Heat Pump Thermostat  
INSTALLATION INSTRUCTIONS  
The T8411R Heat Pump Thermostat provides 24V  
control of two-stage heating and one-stage cooling heat  
pump system with manual changeover from heat to cool.  
First stage heating and cooling cycle rates are fixed at  
3 cph. Second stage heating cycle rate is selectable at  
3, 4, 5, 6, or 9 cph. Temperature indication can be set for  
°F or °C.  
CAUTION  
Electrical Shock or Equipment Damage  
Hazard.  
Can shock individuals or short equipment  
circuitry.  
Disconnect power supply before installation.  
The T8411R Heat Pump Thermostat is powered directly  
from the system transformer. Batteries are not required  
because setpoints are held permanently by non-volatile  
memory.  
Location  
Install the thermostat about 5 ft (1.5m) above the floor in  
an area with good air circulation at average temperature.  
See Fig. 1. Do not install the thermostat where it can be  
affected by:  
The T8411R TRADELINE® model includes a thermostat,  
wallplate (for wiring and mounting thermostat), and  
owner’s guide. A 7 3/8 in. x 5 3/4 in. (188mm x146 mm)  
decorator cover plate (for covering wall marks) is  
available separately. Order Honeywell part no. 209649A  
(taupe color).  
— drafts or dead spots behind doors and in corners.  
— hot or cold air from ducts.  
— radiant heat from the sun or appliances.  
— concealed pipes and chimneys.  
— unheated (uncooled) areas such as an outside wall  
behind the thermostat.  
This thermostat is a precision instrument and was  
carefully adjusted at the factory. Handle it carefully.  
MERCURY NOTICE  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash.  
Mounting Wallplate to Wall  
Contact your local waste management authority  
for instructions regarding recycling and the  
proper disposal of an old control containing  
mercury in a sealed tube.  
IMPORTANT  
Level only for appearance. The thermostat func-  
tions normally even when not level.  
Mount wallplate, T8411R and the screws provided (see  
Fig. 2) as follows:  
1. Place the wallplate at the desired location on the  
wall.  
INSTALLATION  
2. Use a pencil to mark the mounting holes.  
3. Remove the wallplate from the wall and drill two  
3/16 in. holes in the wall (if drywall) or two 7/32 in.  
holes for firmer material such as plaster or wood.  
4. Gently tap the anchors (provided) into the holes  
until flush with the wall.  
5. Position the wallplate over the holes.  
6. Pull the thermostat wire through the wallplate  
entrance hole.  
When Installing this Product…  
1. Read these instructions carefully. Failure to follow  
them could damage the product or cause a hazard-  
ous condition.  
2. Check the ratings given in the instructions and on  
the product to make sure the product is suitable for  
your application.  
3. Installer must be a trained, experienced service  
technician.  
7. Fasten the wallplate to the wall using the anchors  
and screws provided.  
4. After installation is complete, check out product  
operation as provided in these instructions.  
® U.S. Registered Trademark  
Copyright © 2002 Honeywell •  
•All Rights Reserved  
69- 1481- 1  
 
T8411R ELECTRONIC HEAT PUMP THERMOSTAT  
Refer to Fig. 5 for typical wiring hookups. A letter code is  
located near each terminal for identification.  
1. Loosen the terminal screws on the wallplate and  
connect the system wires. See Fig. 5.  
KEEP WIRING IN  
SHADED AREA  
2. Securely tighten each terminal screw.  
G
3. Push the excess wire back into the hole.  
4. Plug the hole with nonflammable insulation to pre-  
vent drafts from affecting the thermostat.  
L
C
R
W2  
E
Mounting Thermostat to Wallplate  
1. Engage the tabs at the top of the thermostat and  
wallplate.  
2. Swing down the thermostat and press the lower  
edge of the thermostat onto the wallplate to latch.  
See Fig. 6.  
W1  
Y
B
1
O
WIRING ENTRANCE  
HOLE  
MOUNTING  
SCREW HOLE  
MOUNTING  
SCREW HOLE  
NOT ALL MODELS HAVE BOTH O AND B TERMINALS.  
1
M11331A  
Fig. 4. Restrict wiring to shaded area.  
L1  
(HOT)  
R
THERMISTOR  
SENSOR  
STAGE 2 RELAY  
L2  
AUXILARY  
THERMOSTAT  
LOGIC  
HEAT RELAY  
1
SYSTEM  
SWITCH  
W2  
L
RELAY  
EM. HT.  
HEAT  
OFF  
CHANGEOVER  
VALVE HEAT  
B
COOL  
CHANGEOVER  
VALVE COOL  
3
O
Y
COMPRESSOR  
CONTACTOR  
STAGE 1 RELAY  
2
COMPRESSOR  
CONTACTOR  
HEAT  
W1  
EMERGENCY  
HEAT RELAY  
E
FAN SWITCH  
ON  
FAN RELAY  
G
C
AUTO  
POWER  
SUPPLY  
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
1
2
3
REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPARATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y).  
NOT ALL MODELS HAVE BOTH O AND B TERMINALS.  
M11333A  
Fig. 5. T8411R two-stage heat and one-stage cool wiring diagram with manual changeover.  
3
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T8411R ELECTRONIC HEAT PUMP THERMOSTAT  
FAN Switch  
Fan switch settings are:  
DASHED LINES INDICATE TABS  
ON BACK OF THERMOSTAT  
On: The fan runs continuously. Use for improved air  
circulation and air quality.  
Auto: Normal setting for most homes. The fan starts  
and stops with the equipment.  
Em Ht  
Aux Ht  
Slide the FAN switch in the bottom left corner of the  
thermostat to select the desired fan setting.  
Set  
Room  
SYSTEM Switch  
System switch settings control thermostat operation as  
follows:  
Cool: The thermostat controls the cooling system.  
Off: Both heating and cooling are off.  
Heat: The thermostat controls the heating system.  
Em Ht: Thermostat cycles auxiliary heat (W2) and  
emergency heat relay (E) as needed to maintain  
setpoint. Terminal L is energized continuously.  
Fault heat relay is on continuously. Cooling system  
is off. Compressor is de-energized.  
F
A
A
N
u
to  
O
n
SY  
O
C
ool  
STE  
M
ff  
H
e
at Em  
H
t
A
ENGAGE TABS AT TOP OF THERMOSTAT  
WITH SLOTS ON MOUNTING PLATE.  
Slide the SYSTEM switch in the bottom right corner of  
the thermostat to select the desired system setting.  
E
m
H
t
A
u
x
H
t
TEMPERATURE DISPLAY  
INCREASE SETTING  
S
e
t
R
o
o
m
DECREASE SETTING  
F
A
N
A
u
to  
O
n
Em Ht  
Aux Ht  
Cool Of  
S
Y
S
T
f
Heat Em Ht  
E
M
Set  
Room  
FA  
Auto  
N
On  
PRESS LOWER EDGE OF  
CASE TO LATCH.  
B
M18541  
SYSTEM  
C
o
o
l
FAN SWITCH  
O
ff  
H
e
a
t E  
m
H
Fig. 6. Mounting thermostat wallplate.  
t
M18542  
SYSTEM SWITCH  
Fig. 7. Digital display and system  
switches (FAN and SYSTEM).  
OPERATION  
Setting FAN and SYSTEM Switches  
Em Ht and Aux Ht Indications  
Fan and system settings are controlled manually by  
using the switches located at the bottom of the  
thermostat case. See Fig. 7.  
The ▲ indicator points to either Emergency Heat (Em Ht)  
or Auxiliary Heat (Aux Ht) when these modes are active.  
Em Ht: The ▲ indicator points to Em Ht when the  
SYSTEM switch is set at Em Ht.  
Aux Ht: The ▲ indicator points to Aux Ht when the  
auxiliary backup heat is needed to help handle  
the heating load.  
INDICATOR  
Em Ht  
Set  
Room  
M18425  
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4
 
   
T8411R ELECTRONIC HEAT PUMP THERMOSTAT  
2. Press the ▲▼ keys simultaneously for more than  
one second to light all segments on display and to  
enter installer setup mode. When the keys are  
released, a two-digit software revision code is dis-  
played.  
Set Temperature Setpoint  
NOTE: Temperature setpoint range is 40° to 99°F (4° to  
39°C).  
The temperature setpoint and the room temperature are  
shown separately on the digital display. The ▼ indicator  
points to Set when the temperature setpoint is displayed  
and to Room when the room temperature is displayed  
.
M18426  
OPTIONAL SYSTEM CHECKOUT  
When the heat or cool outputs are turned on, the five-  
minute off-timer safety feature is bypassed.  
INDICATOR  
ROOM TEMPERATURE  
Set  
Room  
SETPOINT TEMPERATURE  
When in steps 2 and 3 only, the ▼ key can be used to  
turn heat or cool outputs on and off. Change the  
SYSTEM switch setting to test heat or cool outputs. No  
action takes place If the system switch is in the Off  
position.  
M14679  
To set temperature setpoint:  
1. Select Heat or Cool by sliding the SYSTEM switch  
in the lower right corner of the thermostat to the  
desired mode. See Fig. 7.  
2. To display the temperature setpoint on the digital  
display, press either the ▲ or ▼ key once. The  
temperature setpoint is displayed for approxi-  
mately five seconds as the indicator points to Set  
and flashes.  
The following examples of system settings show a two  
digit software code on the display. The code shown is  
only an example; codes may vary.  
System setting at Heat:  
To turn heat on, press the ▼ key.  
M14680  
M18431  
3. To increase the temperature setpoint press the ▲  
key. Each press changes the setpoint one degree;  
press and hold to change the setpoint several  
degrees.  
To turn auxiliary heat on, press the ▼ key.  
Aux Ht  
M18432  
To turn auxiliary heat off, press the ▼ key a third time.  
M14681  
4. To decrease the temperature setpoint press the ▼  
key. Each press changes the setpoint one degree;  
press and hold to change the setpoint several  
degrees.  
M18433  
To turn heat off, press the ▼ key a fourth time.  
M14682  
M18434  
System setting at Cool:  
To turn cool on, press the ▼ key.  
Setting °F/°C Indication and Heat Cycle Rate  
NOTE: To save changes to the °F/°C indication and the  
heat cycle rate, all seven steps must be com-  
pleted.  
M18435  
To turn cool off, press the ▼ key.  
In installer setup mode, steps 2 through 5, each  
press of the ▲ key momentarily displays 01 and  
each press of the ▼ key momentarily displays  
02. When the keys are released, these two-digit  
codes are no longer displayed.  
M18434  
3. Press the ▲ key. Factory information is displayed.  
A typical example is shown, but information dis-  
played varies by model. This information is for fac-  
tory use only.  
To set the °F/°C indication and heat cycle rate:  
1. If the temperature is displayed in °F, set the tem-  
perature setpoint to 52°F. If the room temperature  
is displayed in °C, set the temperature setpoint to  
11°C.  
4. Press the ▲ key again to display °C or °F.  
M14688  
M14683  
5
69-1481-1  
 
T8411R ELECTRONIC HEAT PUMP THERMOSTAT  
5. Press the ▼ key to change the °C or °F indication.  
10. Press the ▲ key to save all changes, exit installer  
setup mode and return to normal operation.  
NOTE: After exiting installer setup mode, change the  
setpoint to the desired room temperature.  
M14689  
NOTE: Stage-one heat and cool cycle rates are fixed at  
3 cph. Only stage-two heat cycle rates are  
selectable.  
CHECKOUT  
Heating  
6. Press the ▲ key to display the heat cycle rate of 3,  
4, 5, 6, 9 or 12. If the desired cycle is displayed,  
see Table 1, press the ▲ key to exit the installer  
setup mode. To change the heat cycle rate, press  
the ▼ key to scroll between 3, 4, 5, 6, 9, and 12.  
Stop scrolling when the desired rate is displayed.  
1. Slide the SYSTEM switch to Heat and the FAN  
switch to Auto.  
2. Press and hold the ▲ key to raise the temperature  
setting several degrees above the room tempera-  
ture. After approximately five minutes, the heating  
equipment should start.  
3. Press the ▼ key to lower the temperature setting  
below the room temperature. Heating equipment  
should stop.  
M14690  
Cooling  
Table 1. Heat Cycle Rates.  
System  
Cycles per Hour  
CAUTION  
Operating at too low of an outdoor  
temperature may cause compressor damage.  
Do not operate cooling if outdoor temperature is  
below 50°F (10°C). Refer to manufacturer’s  
recommendations.  
Equipment Damage Hazard.  
Hydronic heat, condensing gas  
3
a
furnace  
Gas or oil forced air  
Electric heat  
6
9
•
For compressor protection, allow the  
compressor to remain off for five minutes  
before restarting.  
b
4, 5, 12  
Special applications  
1. Slide the SYSTEM switch to Cool and the FAN  
switch to Auto.  
2. Press the ▼ key to lower the temperature setting  
several degrees below the room temperature. After  
approximately five minutes, the cooling equipment  
and fan should start.  
a
b
High efficiency furnace.  
Refer to equipment manufacturer’s instructions.  
7. Press the ▲ key to display cooling algorithm con-  
figuration default.  
3. Press the ▲ key to raise the temperature setting  
above the room temperature. Cooling system  
should shut down.  
or  
M18421  
8. Press the ▲ key again to change cooling algorithm  
to C1 or C3.  
Fan  
1. Slide the SYSTEM switch to Off and the FAN  
switch to On. The fan should run continuously.  
2. Slide the FAN switch to Auto. The system turns the  
fan on and off with the equipment.  
C1 = Standard cooling algorithm.  
C3 = Aggressive cooling algorithm (can cause  
overshooting).  
9. Press the ▲ key again. Current configuration (CC)  
is displayed. A typical example is shown, but CC  
varies by model. (This information is for factory use  
only.)  
Make certain all equipment responds properly to the  
thermostat.  
M18420  
Automation and Control Solutions  
Honeywell  
Honeywell Limited-Honeywell Limitée  
1985 Douglas Drive North  
Golden Valley, MN 55422  
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
69-1481-1 G.H. Rev. 2-02  
Printed in U.S.A.  
www.honeywell.com/yourhome  
 

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