Installation
Guide
VisionPRO®IAQ
Equipment Interface Module
English: Page 1 • Français: Page 6 • Español: Página 11
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, highefficiency furnaces, heat pumps,
steam, gravity
• Heat only — two-wire systems,
power to open and close zone
valves (Series 20), and normallyopen zone valves
• Heat only with fan
• Cool only
• Variable speed 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.
® U.S. Registered Trademark.
Copyright © 2006 Honeywell International Inc.
All rights reserved.
VisionPRO®IAQ Equipment Interface Module
Installation
1 Remove cover from Equipment Interface Module (EIM).
2 Select location and mount EIM as shown below.
Wall anchor
Drill 3/16” holes
for drywall. Drill
7/32” holes for
plaster.
Furnace/air handler Water heater
CAUTION: This product may be damaged if mounted inside HVAC equipment. Install
only on the outside of HVAC equipment.
Mounting screw
Wiring
Connect wires as shown below (see wiring guides on following pages).
All wiring must comply with local electrical
codes and ordinances.
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Wiring guide — conventional systems
FURNACE
Transformer
Stage 1 heat
Stage 2 heat
Fan
Humidifier
Dehumidifier
Ventilation
THERMOSTAT
24Vac120Vac
Air conditioning
compressors
Stage 1
Stage 2
Temperature sensor
EQUIPMENT INTERFACE
MODULE
(outdoor)
Temperature sensor
(indoor)
Discharge air
temperature sensor
NOTE: Check other equipment manuals to verify proper terminal connections.
3
VisionPRO®IAQ Equipment Interface Module
EIM wiring guide — heat pump systems
THERMOSTAT
Bypass humidifier
Low speed fan
Ventilator
EQUIPMENT INTERFACE
MODULE
Jumpers
NOTE: Check other equipment manuals to verify proper terminal connections.
Restore power & check operation
Changeover relay
Backup heat
(gas/electric)
Backup heat
(gas/electric)
Compressor
(stage 1)
Compressor
(stage 2)
Fan relay
System monitor
LED
Restore power and check LED:
• LED blinks rapidly: Normal information transfer.
• LED blinks once: Incoming message to EIM.
• LED blinks continuously: Wiring problem. Check
wiring to terminals 1, 2, 3.
• LED always off: Wiring problem. Check wiring to
terminals 1, 2, 3.
• LED always on: EIM may need replacement.
NOTE: It is normal for the LED to blink continuously during startup, and while checking
equipment status (Auto Discover mode).
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Replace EIM cover
Place cover on EIM, then push gently until it snaps into place.
Specifications
Temperature Ranges
• Heat: 40° to 90°F (4.5° to 32°C)
• Cool: 50° to 99°F (10° to 37°C)
Operating Ambient Temperature
• 0° to 120°F (-18° to 49°C)
Shipping Temperature
• -30° to 150°F (-34° to 66°C)
Operating Relative Humidity
• 5% to 90% (non-condensing)
Physical Dimensions
• 4-9/16” H x 6” W x 1-3/8” D
• 116 mm H x 152 mm W x 35 mm D
Electrical Ratings
Terminal Voltage (50/60Hz) Running Current
W Heating 20-30 Vac 0.02-1.0 A
W2 Heating 20-30 Vac 0.02-1.0 A
W3 Heating 20-30 Vac 0.02-1.0 A
Y Cooling 20-30 Vac 0.02-1.0 A
Y2 Cooling 20-30 Vac 0.02-1.0 A
Aux Auxiliary heat 20-30 Vac 0.02-1.0 A
Aux2 Auxiliary heat 20-30 Vac 0.02-1.0 A
G Fan 20-30 Vac 0.02-1.0 A
O/B Changeover 20-30 Vac 0.02-1.0 A
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