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THERMOSTAT QUICK REFERENCE

Battery door information

2

Use the finger bevel on 
the lower portion of the 
side of the thermostat to 
open the easy access 
battery door.

Important:

The low battery indicator is displayed 
when the AA battery power is low. If 
the user fails to replace the battery 
within 21 days, the thermostat 
display 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 the user 

selectable setpoint 

temperature.

System operation 

indicators: ON will 

display when the 

COOL, HEAT or 

Emergency Heat is on.

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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