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This manual covers the following models:
• T621-2

OPERATING MANUAL

Caution:

 

Equipment damage hazard
Do not operate the cooling 
system if the outdoor 
temperature is below 50˚ F
(10˚ C) to prevent possible 
compressor damage.

Thermostat Quick Reference
Thermostat Operation
More Information
Contact Us and Warranty Registration

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Congratulations on purchasing a 
new thermostat.
 This thermostat was 
designed to the highest reliability and 
ease of use standards. Thank you for 
choosing Pro1.

® U.S. Registered Trademark. Patents pending.
Copyright © 2010 Pro1 IAQ, Inc. All rights reserved.

Rev. 1043

Table of Contents

Page

1

Need Help?

 

For assistance with this product please 

visit http://www.pro1iaq.com or call Pro1 

Customer Care toll-free at 888-Pro1iaq 

(776-1427) during normal business hours 

(Mon-Fri 9 AM - 6 PM Eastern)

Una versión española de este 
manual puede ser descargada 
en www.pro1iaq.com

Summary of Contents for T621-2

Page 1: ...ions on purchasing a new thermostat This thermostat was designed to the highest reliability and ease of use standards Thank you for choosing Pro1 U S Registered Trademark Patents pending Copyright 2010 Pro1 IAQ Inc All rights reserved Rev 1043 Table of Contents Page 1 Need Help For assistance with this product please visit http www pro1iaq com or call Pro1 Customer Care toll free at 888 Pro1iaq 77...

Page 2: ...will only show the low battery indicator as a final warning before the thermostat becomes inoperable Getting to know your thermostat LCD 1 2 Fan Switch 3 System Switch 4 Easy Change Battery Door 5 Setpoint Buttons 1 2 3 4 5 Low Battery Indicator Replace batteries when indicator is shown 1 will appear in the display when the auxiliary heat is active Indicates the current room temperature Displays t...

Page 3: ...r cooling system is on System Switch Selects the operation mode of your HVAC system Selecting HEAT turns on the heat mode Selecting COOL turns on the air conditioning mode Selecting OFF turns both heating and cooling off Selecting EmH locks out your compressor and turns on the secondary heat mode 1 2 3 4 Understanding Thermostat Staging Your thermostat will control two stages of heating The thermo...

Page 4: ...______ Address ____________________________ ____________________________ City ____________________________ State ____________________________ Zip _____________________ Thermostat Model _____________________ Date Installed _____________________ Contact Us Information Pro1 IAQ Warranty Registration 1 2 Pro1 IAQ Inc 1111 S Glenstone Suite 2 100 Springfield MO 65804 Toll free 1 888 Pro1iaq 776 1427 To...

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