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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.
Install the thermostat about 5 feet (1.5m) above the floor in an area
with good air circulation at average temperature.
Do not install
in locations where the thermostat can be affected by:
• Drafts or dead spots behind doors and in corners
• Hot or cold air from ducts
• Sunlight or radiant heat from appliances
• Concealed pipes or chimneys
• Unheated/uncooled areas such as an outside wall behind the thermostat
NO
NO
NO
® U.S. Registered Trademark. Patents pending.
Copyright © 2005 Honeywell International Inc. All rights reserved.
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Pre-installation checklist ................2
Wallplate installation ......................3
Wiring..............................................4
Wiring diagrams ..............................5
Power options ..............................10
Thermostat mounting ..................10
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Installer setup................................11
Installer system test ......................13
Explanation of features ................14
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Quick reference to controls..........15
Quick reference to display............15
Battery replacement......................15
In case of difficulty ......................16
Accessories/replacement parts ....17
Specifications ................................17
Table of contents
Installation tips