Product Application
This thermostat provides electronic control of 24 VAC single-stage heating and cool-
ing systems, or 750 mV heating systems.
System Types
• (-?as,oil, or electric heat with air
conditioning
• Warm air, hot water, high-efficiency
fl_rnaces, heat pumps, steam, gravi-
ty
• Heat only -- two-wire systems,
power to open and close zone
valves (Series 20), and normally-
open zone valves
• Heat only with fan
• Coo! only
• 750 mV heating systems
Power Options
• Battery power only
• Common wire only
• Common wire with batte W backup
Changeover Options
• Selectahle manual or
auto-changeover modes
System Settings
• Heat, Oft, Cool, Auto
CAUTION: ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before
beginning installation.
MERCURY NOTICE
If this product is replacing a control that contains mercury in a sealed tube, do not
place the old control in the trash. Contact your local waste management authority for
instructions regarding recycling and proper disposal.
® U.S. Registered Trademark. Patents pending.
Copyright ® 2005 Honeywell International Inc. All rights reserved.
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