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Honeywell Non Programmable Thermostat, 1H/1C 24v Digital - Large Display (UPGRADED)

Price: $79.88
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SKU: T8400C1040A
(See Product Details Below for Manufacturers Part Numbers)
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Honeywell TH5110D Non-programmable

*Part Number 50002883-001 - Cover Plate Included! (Med6.5x4.7, Lrg6x8.3")


The TH5110D Non-programmable Thermostat provides
electronic control of 24 Vac, single-stage heating and
cooling systems or 750 mV heating systems.


If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of the old thermostat.


When installing this product…

1. Read these instructions carefully. Failure to follow
these instructions can 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

4. After completing installation, use these instructions
to check out the product operation.


Electrical Hazard.

Can cause electrical shock or equipment

Disconnect power before beginning installation.

Select Thermostat Location

Select a location for the thermostat about 5ft (1.5m)

above the floor in an area with good air circulation at

average temperature.

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 sun or appliances.

— Concealed pipes and chimneys.

— Unheated (uncooled) areas such as an outside wall
behind the thermostat.

Separate Wallplate from Thermostat

1. Separate the wallplate from the thermostat.

Install Wallplate

Mount the thermostat horizontally on the wall:

1. Pull the wires through the wire hole on the

2. Position the wallplate on the wall with the arrow
pointing up. Level the wallplate for appearance

3. Use a pencil to mark the mounting holes.

4. Remove the wallplate from the wall and drill
two 3/16-in. holes in the wall (if drywall) as marked.
For firmer material such as plaster, drill two 7/32-in.
holes. Tap the wall anchors (provided) into the
drilled holes until flush with the wall.

5. Pull the wires through the wire hole on the
wallplate and position the wallplate over the wall

6. Insert the mounting screws into the wall anchors
and tighten.


All wiring must comply with local electrical codes and


Electrical Hazard.
Can cause electrical shock or equipment
Disconnect power before wiring.


Use 18-22 gauge thermostat wire. Shielded
cable is not required.

1. Loosen the screw terminals that are used for the
application. Insert the wires into the terminal block
and tighten each screw terminal.

2. Push excess wire back into the wall opening and
restrict wires to the shaded area.

3. Plug the wall opening with nonflammable insulation
to prevent drafts from affecting the thermostat.


1. When used in a single-transformer system, leave metal jumper in place between Rc and R. If used on a

two-transformer system, remove metal jumper between Rc and R.

2. Common wire is optional when thermostat is used with batteries.

3. If thermostat is configured for a heat pump in the Installer Setup, configure changeover valve

for cool (O-factory setting) or heat (B).

Replaces Part Numbers: TH5110D1022, T8400C1040, CARTH5110D1022, CART8400C1040


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Todd Mills

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