Jun 14, 2018
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The TH5110D Non-programmable Thermostat provides
electronic control of 24 Vac, single-stage heating and
cooling systems or 750 mV heating systems. See Table 1
for a description.
Table 1. TH5110D Thermostat description.
• Battery only
• Common wire only
• Common wire with battery backup
System Types (Up to 1 Heat, 1 Cool)
• Gas, oil or electric heat with air conditioning
• Warm air, hot water, high efficiency furnaces, heat pumps, steam
• Heat only— includes power to open and power to close zone valves
(Series 20) and normally-open zone valves
• Heat only with fan
• Cool only
• 750 mV heating systems
Manual or auto changeover selectable
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.
® U.S. Registered Trademark
Copyright © 2004 Honeywell International Inc. •
• All Rights Reserved
TH5110D NON-PROGRAMMABLE THERMOSTAT
When installing this product…
Separate Wallplate from Thermostat
Read these instructions carefully. Failure to follow
these instructions can damage the product or
cause a hazardous condition.
Check the ratings given in the instructions and on
the product to make sure the product is suitable for
Installer must be a trained, experienced service
After completing installation, use these instructions
to check out the product operation.
Separate the wallplate from the thermostat. See
Can cause electrical shock or equipment
Disconnect power before beginning installation.
Select Thermostat Location
Fig. 2. Separate wallplate from thermostat.
Select a location for the thermostat about 5ft (1.5m)
above the floor in an area with good air circulation at
average temperature. See Fig. 1.
Install Wallplate (See Fig. 3.)
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