Honeywell VisionPRO TH8000 Series Installation Guide
Summary
The VisionPRO series programmable thermostat offers advanced climate control for diverse HVAC systems, including heat pumps, conventional cooling/heating, and multi-zone setups. This comprehensive manual is an essential resource detailing step-by-step installation, wiring diagrams, and electrical guidelines for skilled technicians. Whether managing complex 2H/2C or simple single-stage systems, the guide ensures proper power connection and optimal performance, making it indispensable for HVAC professionals seeking reliable setup and configuration advice.
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Installation Guide
Vision PRO® TH8000 Series Touch-screen Programmable Thermostat
This manual covers the following models TH8110U: For 1 Heat/1 Cool systems TH8320U: For up to 3 Heat/2 Cool systems TH8321U: For up to 3 Heat/2 Cool systems with dehumidification (Pull thermostat from wallplate and turn over to find model number)
System Types Heat only — two-wire systems, power to open and close zone
Gas, oil, or electric heat with air
valves (Series 20), and normally-
conditioning
open zone valves
Warm air, hot water, high-
Heat only with fan
efficiency furnaces, heat pumps,
steam, gravity Cool only 750 m V heating systems
Need Help?
For assistance with this product please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502
® U.S. Registered Trademark.
US Patent No. 6595430, D509151 and other patents pending. Copyright © 2006 Honeywell International Inc.
All rights reserved.
Page Summary Contents For Honeywell VisionPRO TH8000 Series Installation Guide
Manual Details
| Brand | Honeywell |
|---|---|
| Pages | 24 |
| File Size | 616.85 KB |
| Published | May 22, 2026 |
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Frequently Asked Questions
Who should install this thermostat?
This unit must be installed by a trained, experienced technician. Failure to follow instructions can cause damage or hazardous conditions.
What happens if I replace an old control with mercury?
Do not place the old control in the trash; contact your local waste management authority for recycling and proper disposal instructions.
How do I power the unit with 24VAC primary power?
Connect the common wire from the secondary side of the transformer to the 'C' terminal. Batteries can provide backup power (S) on the side of the transformer.
What is the range for cooling operations?
The recommended operating range for cooling systems is 50° to 99°F (10° to 37°C).