Product Application
This thermostat provides electronic control of 24 VAC single-stage heating and cool-
ing systems,or 750 mV heating systems.
System Types
Gas,oil, or electric heat with air
conditioning
Warm air,hot water,high-efficiency
furnaces,heat pumps, steam,gravi-
ty
Heat only
Heat only with fan
Cool only
750 mV heating systems
Power Type
Battery power
Common wire
Common wire with battery backup
System Settings
Heat,Off, Cool
Fan Settings
Auto,On
Must be installed by a trained, experienced technician
Read these instructions carefully.Failure to follow these instructions can dam-
age 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 12).
Always test for proper operation after installation (see pages 8-9).
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.
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Copyright © 2005 Honeywell International Inc. All rights reserved.