31 68-0058—1
T8621A,C,D
TABLE OF CONTENTS
T able of Contents
page
Specifications ......................................................................................................................................................................2
Ordering Information ..........................................................................................................................................................2
Selection/Application.......................................................................................................................................................... 5
Installation........................................................................................................................................................................... 7
Compatibility.................................................................................................................................................................. 7
Location .......................................................................................................................................................................... 7
Mounting Subbase.......................................................................................................................................................... 8
Mounting Remote Temperature Sensor .........................................................................................................................8
Wiring............................................................................................................................................................................. 9
Adjusting Cycle Rate ...................................................................................................................................................15
Time/Temperature Conversion ....................................................................................................................................15
Fan Operation Option Switch....................................................................................................................................... 16
Installing Batteries........................................................................................................................................................ 16
Power Outages.............................................................................................................................................................. 16
Mounting the Thermostat .............................................................................................................................................16
Setting Day and Time................................................................................................................................................... 16
Checkout............................................................................................................................................................................ 17
Heating.......................................................................................................................................................................... 17
Cooling .........................................................................................................................................................................17
Fan ................................................................................................................................................................................17
Installer Self-Test .........................................................................................................................................................18
Programming the Thermostat ...........................................................................................................................................19
Enter the Day and Time ...............................................................................................................................................19
Set the Program Times and Temperatures for One Day.............................................................................................. 20
Copy the Program to the Desired Days........................................................................................................................ 22
Set the Schedules and Temperatures For the Remaining Days ...................................................................................23
Set the System and Fan Switches on the Subbase‘...................................................................................................... 24
Operating the Thermostat.................................................................................................................................................. 25
Temporarily Changing the Program ............................................................................................................................25
Reprogramming the Thermostat ..................................................................................................................................25
Holding a Temperature for Extended Absence............................................................................................................ 26
Canceling Program Settings......................................................................................................................................... 26
Checking the Program Times and Temperatures......................................................................................................... 27
Checking the Current Temperature Setting .................................................................................................................27
Operation ...........................................................................................................................................................................28
ADAPTIVE INTELLIGENT RECOVERY™ Operation ...........................................................................................28
What to Expect During Recovery from Energy Savings in Heating........................................................................... 28
Thermal Performance with T8621 ...............................................................................................................................28
Minimum-Off Timing ..................................................................................................................................................28
Troubleshooting ................................................................................................................................................................29
Glossary............................................................................................................................................................................. 30
This equipment is a Class B digital apparatus which complies with Canadian Radio Interference Regulations, CRC c.1374.