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Product Application
This thermostat provides electronic control of 24 VAC single-stage and multi-stage
heating and cooling systems, or 750 mV heating systems.
System Types
(up to 2 heat/2 cool)
• Gas, oil, or electric heat with air
conditioning
• Warm air, hot water, high-efficiency
furnaces, heat pumps, steam, gravity
• Heat only — two-wire systems,
power to open and close zone
valves (Series 20), and normally-
open zone valves
• Heat only with fan
• Cool only
• 750 mV heating systems
Power Options
• Battery power only
• Common wire only
• Common wire with battery backup
Changeover Options
• Selectable manual or
auto-changeover modes
System Settings
• Heat, Off, Cool,Auto, Em Heat
Fan Settings
• Auto, On
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.
• Check the ratings in this booklet to verify that this product is suitable for your
application (see page 17).
• Always test for proper operation after installation (see page 13).
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.