VisionPRO
Equipment Interface Module
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For up to 4 Heat/2 Cool systems with Honeywell TH9421C or equivalent.
System Types
•
Gas, oil, or electric heat with air
conditioning
•
Warm air, hot water, high-
efficiency furnaces, heat pumps,
steam, gravity
•
Heat only — two-wire systems,
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.
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 © 2006 Honeywell International Inc.
All rights reserved.
®
IAQ
Installation
Guide
power to open and close zone
valves (Series 20), and normally-
open zone valves
•
Heat only with fan
•
Cool only
•
Variable speed systems