Honeywell thm5421c User Manual

VisionPRO® IAQ
Equipment Interface Module
Installation
Guide
® U.S. Registered Trademark. US Patent No. 6,208,263; 6,373,376;
6,448,901; 7,012,927 and other patents pending.
Copyright © 2011 Honeywell International Inc.
All rights reserved.
69-1823EFS-05
English: Page 1 • Français: Page 6 • Español: Página 11
For up to 4 Heat/2 Cool systems with Honeywell THM5421C or equivalent.
System Types
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 manage-
ment authority for instructions regarding recycling and proper disposal.
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.
• Gas,oil,orelectricheatwithair
conditioning
• Warmair,hotwater,high-
efficiency furnaces, heat pumps,
steam, gravity
• Heatonly
• Heatonlywithfan
• Coolonly

Honeywell thm5421c Specifications

General

Brand	Honeywell
Model	thm5421c
Category	Thermostat
Language	English

Summary

Honeywell VisionPRO IAQ Installation Guide

System Types and Overview

Lists supported HVAC system configurations like 4H/2C and system types like heat/cool, heat only, cool only.

Critical Installation & Safety Warnings

Consolidates professional installation, electrical hazards, and mercury disposal warnings for installers.

EIM Installation and LED Indicators

Mounting Procedures & Precautions

Details steps for mounting the EIM and warns against installing it inside HVAC equipment to prevent damage.

LED Status Interpretation

Explains the meaning of different LED blinking patterns indicating EIM status or wiring issues.

Wiring Diagrams for HVAC Systems

Conventional & Heat Pump System Wiring

Illustrates wiring for conventional and heat pump HVAC systems, covering multiple heating and cooling stages.

Humidifier Connection Wiring

Provides wiring diagrams for connecting powered and non-powered humidifiers to the system.

Equipment Wiring Configurations

Ventilation, Dehumidifier & Blower Wiring

Details wiring for various ventilation, dehumidifier, and blower types, including a specific DH90 model and low-speed fan.

Wiring Diagram Key

Defines symbols used in wiring diagrams for normally open and normally closed contacts.

Product Specifications & Ratings

Operating Environment and Dimensions

Outlines acceptable temperature, humidity ranges for operation/shipping, and physical size of the EIM.

Electrical Terminal Specifications

Details voltage and current ratings for each terminal on the EIM, crucial for correct wiring.

Support and Company Information

Customer Support & Assistance

Provides contact information and website for product assistance in English, French, and Spanish.

Honeywell Company Details

Lists Honeywell's contact addresses, website, copyright, and printing information.