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Installation
Guide
69-1928EFS-01
PRO TH4000 Series
Programmable Thermostat
This manual covers the following models
• TH4110D: For 1 Heat/1 Cool systems
• TH4210D: For 2 Heat/1 Cool heat pump systems only
(Pull thermostat from wallplate and turn over to find model number.)
System Types
TH4110D:
• Ga
s, oil, or electric heat with air
conditioning
• Warm air, hot water, high-
efficiency furnaces, 1 Heat/1
Cool heat pumps, steam, gravity
• Heat only
• Heat only with fan
• Cool only
•
750 mV heating systems
TH4210D:
• 2 Heat/1 Cool heat pumps
Must be installed by a trained, experienced technician
Read these instructions carefully. Failure to follow these instructions
can damage the product or cause a hazardous condition.
Need Help?
For assistance with this product please visit
http://customer.honeywell.com
or call Honeywell Customer Care toll-free at
1-800-468-1502