Honeywell TH5110D User Manual

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Copyright © 2004 Honeywell International Inc.  •  

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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. 

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.

Powering Methods

• 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 

and gravity

• 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

Changeover

Manual or auto changeover selectable

System Setting

Heat-Off-Cool-Auto

Fan Setting

Auto-On