Honeywell T8411R User Manual
T8411R Electronic
Heat Pump Thermostat
INSTALLATION INSTRUCTIONS
APPLICATION
The T8411R Heat Pump Thermostat provides 24V control
of a 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, 6, or
9 cph. Temperature indication can be set for °F or °C.
The T8411R Heat Pump Thermostat is powered directly
from the system transformer. Setpoints are held permanently
in memory and retained during power outages.
The T8411R includes a thermostat, wallplate (for wiring
and mounting thermostat) and owner’s guide. A 7 3/8 in.
(188 mm) x 5 3/4 in. (146 mm) Decorator Cover Plate (for
covering wall marks) is available separately. Order
Honeywell part no. 209650A (Premier White
RECYCLING NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do
control in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of an old control containing mercury in a
sealed tube.
®
).
not
place your old
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous 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.
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Disconnect power supply before beginning wiring
to prevent electrical shock or equipment damage.
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:
— 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.
Mounting Wallplate
IMPORTANT
Level for appearance only. The thermostat
functions normally even when not level.
Mount wallplate, T8411R and the screws provided
(see Fig. 2) as follows:
1. Position the wallplate at the desired location on the
wall.
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) and two 7/32 in. holes
for firmer material such as plaster or wood. Gently
tap the anchors (provided) into the holes until flush
with the wall.
4. Position the wallplate over the holes.
5. Pull the thermostat wire through the entrance hole
on the wallplate.
®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • • All Rights Reserved
X-XX UL
69-1037
T8411R ELECTRONIC HEAT PUMP THERMOSTAT
NO
NO
Fig. 1. Typical location of thermostat.
WALL
MOUNTING
SCREWS (2)
WALL
ANCHORS (2)
WALLPLATE
M12202
Fig. 2. Mounting wallplate to wall.
Wiring
IMPORTANT
Use 18-gauge thermostat cable for proper wiring.
All wiring must comply with local electrical codes and
ordinances.
YES
5 FEET
[1.5 METERS]
The shape of the terminals permits insertion of straight or
wraparound wiring connections; either method is acceptable.
See Fig. 3.
NO
M11338
CAUTION
Disconnect the power supply to prevent electrical
shock or equipment damage.
FOR STRAIGHT INSERTION
TERMINAL
SCREW
STRIP 5/16 IN. (8 MM)
FOR WRAPAROUND
STRIP 7/16 IN. (11 MM)
G
L
C
R
W1
Y
W2
E
B
O
M11334
69-1037
Fig. 3. Wiring connections.
2
T8411R ELECTRONIC HEAT PUMP THERMOSTAT
KEEP WIRING IN
SHADED AREA
MOUNTING
SCREW HOLE
G
C
R
W1
Y
WIRING ENTRANCE
HOLE
L
W2
E
B
O
MOUNTING
SCREW HOLE
M11331
NOTE: Restrict all wiring to the shaded area between the
terminals. See Fig. 4.
Refer to Fig. 5 for typical wiring hookup. 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.
2. Securely tighten each terminal screw.
3. Push the excess wire back into the hole.
4. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
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.
Fig. 4. Restrict wiring to shaded area.
THERMISTOR
SENSOR
THERMOSTAT
LOGIC
POWER
SUPPLY
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
2
REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPERATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y).
STAGE 2 RELAY
STAGE 1 RELAY
FAN SWITCH
ON
AUTO
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
Fig. 5. T8411R two-stage heat and one-stage cool wiring diagram with manual changeover.
R
AUXILARY
HEAT RELAY
W2
L
CHANGEOVER
VALVE HEAT
B
O
COMPRESSOR
CONTACTOR
Y
2
W1
EMERGENCY
HEAT RELAY
E
G
C
RELAY
CHANGEOVER
VALVE COOL
COMPRESSOR
CONTACTOR
HEAT
FAN RELAY
M11333
L1
(HOT)
L2
1
3
69-1037
Loading...