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.

X-XX UL

69-1037

T8411R ELECTRONIC HEAT PUMP THERMOSTAT

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.

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)

M11334

69-1037

Fig. 3. Wiring connections.

T8411R ELECTRONIC HEAT PUMP THERMOSTAT

KEEP WIRING IN SHADED AREA

MOUNTING SCREW HOLE

WIRING ENTRANCE HOLE

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.

REMOVE JUMPER, WHEN SUPPLIED, FOR SYSTEMS WITH SEPERATE HEATING COMPRESSOR CONTACTOR (W1 SEPARATE FROM Y).

STAGE 2 RELAY

STAGE 1 RELAY

FAN SWITCH

AUTO

SYSTEM SWITCH

EM. HT.

HEAT

OFF

COOL

Fig. 5. T8411R two-stage heat and one-stage cool wiring diagram with manual changeover.

AUXILARY HEAT RELAY

CHANGEOVER VALVE HEAT

COMPRESSOR CONTACTOR

EMERGENCY HEAT RELAY

RELAY

CHANGEOVER VALVE COOL

COMPRESSOR CONTACTOR HEAT

FAN RELAY

M11333

L1 (HOT)

69-1037

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