Operation ManualOperation Manual
T621-2
Pro1 Technologies
P.O. Box 3377
Springeld, MO 65808-3377
Toll Free : 888-776-1427
Web: www.pro1iaq.com
Hours of Operation: M-F 9AM - 6PM Eastern
U.S. Registered Trademark. Patents pending
Copyright 2018 All Rights Reserved.
Table of Contents
Table of Contents
Thermostat Operation
Thermostat Quick Reference
Thermostat Warranty Information
Una version en español de este
manual se puede descargar en la
pagina web de la compañia.
Rev. 1814
Page
1
2-3
4-6
7
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 OperationThermostat Operation
LCD
Fan Switch
System Switch
Set At
OFFH EAT
EmHCOOL
Temperature Setpoint Buttons
Easy change battery door
LCD Display
See page 6 for details about
this display read out.
Fan Switch
Select ON or AUTO. ON will
run the fan continuously.
AUTO will turn the fan on
only when the heating or
cooling system is on.
Note: The compressor
delay is active if “ON”
is ashing. The
compressor will not
turn on until the 5
minute delay has
elapsed.
System Switch
Selects the operation mode
on 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 o.
Selecting EmH locks out
your compressor and turns
on the secondary heat
mode.
Temperature Setpoint Buttons
Press the + or - buttons to
select the desired room
temperature.
Easy change battery door
Thermostat Quick Reference
Battery Installation
Thermostat Quick Reference
Important:
Insert 2 AA
Alkaline batteries
(included). High
quality alkaline
batteries are
recommended.
Simple
operating
instructions
are found
on the back
of the
battery
door.
Understanding Your Thermostats Staging:
This thermostat controls 2 stages of heating. For reasons of energy
eciency the thermostat will try to maintain your comfort setting
using only 1 stage. If the 2nd stage is necessary it will be used and
you will see +1 in the display.
The low battery icon is displayed when the AA battery power
is low. Whenever the thermostat detects low battery voltage
from the AA batteries, the low battery icon will begin ashing
on the screen for 21 days (if the batteries are not changed).
If the batteries are not changed 22 days after the thermostat
detects low battery voltage, the thermostat screen will only
show the ashing battery icon until buttons are pressed. If the
batteries are not changed 43 days after the thermostat detects
low battery voltage, the thermostat screen will only show the
ashing battery icon until buttons are pressed and the set
points will oset to 85°F/29°C in cooling and 55°F/13°C in
heating. At this stage, set point changes can be made
temporarily but, the set points will change back to defaulted
values after a 4-hour period. The thermostat will continue to
perform this low battery ashing, temperature oset
condition until the internal voltage threshold is reached. When
the thermostat internal voltage threshold is reached, all relays
will be opened and the thermostat will become inoperable
until new batteries are installed.
Thermostat Quick Reference
Warranty Information
System Operation Indicators:
ON will display when the COOL,
HEAT or Emergency Heat is on.
NOTE: The compressor delay feature is
active if ON is ashing. The compressor will
not turn on until the 5 minute delay has
elapsed.
Indicates the
current room
temperature.
Stage 1 and 2
indicate the stages
of HEAT that are
active.
Displays the
selected setpoint
temperature.
Low Battery
Indicator:
Replace batteries
when indicator is
shown.
Warranty Registration
Your new thermostat has a 2 year limited warranty. You must register
your thermostat within 60 days of installation. Without this
registration the warranty period will begin on date of manufacture.
For warranty issues please contact the HVAC professional that
installed this product. You can register your new thermostat in 2 ways:
Online
Go to the company website, select warranty registration and
ll out a short registration form.
Mail
Complete the form below and mail it to the address shown.
Warranty Registration
Name:
Address:
City:
State:
Zip:
Thermostat Model:
Date Installed:
Complete form and mail to:
Thermostat Warranty Registration
Pro1iaq
P.O. Box 3377
Springeld, MO 65808-3377
Cut Out For
Warranty Registration
www.pro1iaq.com
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