Honeywell T8621A - Manual

Honeywell T8621A

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Table of Contents:

  • Page 2 – SPECIFICATIONS • ORDERING INFORMATION; Specifications; SUPER TRADELINE MODEL; SUPER TRADELINE FEATURE: Fan operation switch; TRADELINE MODELS; lights during thermostat ON cycle.; Ordering Information; Number of heat and cool stages desired.
  • Page 3 – SPECIFICATIONS
  • Page 4 – SPECIFICATIONS • SELECTION/APPLICATION
  • Page 10 – INSTALLATION
  • Page 13 – AA
  • Page 15 – ADJUSTING CYCLE RATE; To customize the thermostat cycling performance to
  • Page 17 – INSTALLATION • CHECKOUT; HEATING; CAUTION; FAN; Checkout
  • Page 19 – CHECKOUT • PROGRAMMING THE THERMOSTAT; Programming the Thermostat
  • Page 22 – PROGRAMMING THE THERMOSTAT
  • Page 25 – PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT; Operating the Thermostat
  • Page 26 – OPERATING THE THERMOSTAT
  • Page 28 – OPERATION; When Adaptive Intelligent RecoveryTM is Used; Operation
  • Page 29 – TROUBLESHOOTING; Troubleshooting
  • Page 30 – GLOSSARY; Glossary
  • Page 31 – TABLE OF CONTENTS; Table of Contents; page
  • Page 32 – Honeywell Limited—Honeywell Limitée
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1

68-0058—1

T8621A,C,D

Chronotherm™ III Fuel

Saver Thermostats

C. H. • Rev. 8-92 • ©Honeywell Inc. 1992 • Form Number 68-0058—1

■

Full seven-day program capability; different sched-
ules may be selected for every day.

■

Can be programmed in hand (with batteries in-
stalled) or on wall to provide up to four temperature
settings per day.

■

Large digital clock (liquid crystal display) indi-
cates continuous time, day, current period and
room temperature.

■

Adaptive Intelligent Recovery™ brings room
temperature to programmed temperature at pro-
grammed time, maximizing comfort and energy
savings.

■

Temperature control program maintains tempera-
ture within 1

°

F of setpoint.

■

Temporary program override available by using—
— WARMER and COOLER keys
— SKIP next period key
— CHANGE to last period key

■

HOLD TEMP key provided for indefinite pro-
gram override (vacation/holiday).

■

Installer self-test and time delay override save
installation time.

■

SYSTEM light-emitting diode (LED) indicates
system is energized.

■

Models available with automatic or manual heat/
cool changeover.

■

Batteries included provide power to maintain
clock and memory during power failures.

■

Switching subbase with wiring terminals included.

■

Powered directly from control transformer, requir-
ing an extra (24V) wire to thermostat.

■

Fan operation switch included on back of SUPER
TRADELINE models to select either indepen-
dent or direct thermostat control of fan in heating.

■

Models available with separate sensor for remote
mounting.

CONTENTS

Specifications ............................................... 2
Ordering Information ................................... 2
Selection/Application ................................... 5
Installation ................................................... 7
Checkout ..................................................... 17
Programming the Thermostat .................... 19
Operating the Thermostat .......................... 25
Operation ................................................... 28
Troubleshooting ......................................... 29
Glossary ..................................................... 30
Table of Contents ....................................... 31

The T8621A,C,D Chronotherm III Program-

mable Fuel Saver Thermostats provide auto-
matic control of single or multistage heating/
cooling systems and offer users the highest
standard of comfort and convenience available
with energy savings.

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Summary

Page 2 - SPECIFICATIONS • ORDERING INFORMATION; Specifications; SUPER TRADELINE MODEL; SUPER TRADELINE FEATURE: Fan operation switch; TRADELINE MODELS; lights during thermostat ON cycle.; Ordering Information; Number of heat and cool stages desired.

2 T8621A,C,D SPECIFICATIONS • ORDERING INFORMATION Specifications IMPORTANT: The specifications given in this publica- tion do not include normal manufacturing toler-ances. Therefore, this unit may not exactly matchthe listed specifications. Also, this product istested under closely controlled condi...

Page 3 - SPECIFICATIONS

3 68-0058—1 T8621A,C,D SPECIFICATIONS TABLE 2—TRADELINE MODELS. Thermostat Model Stages Changeover Switching Number Heat Cool Type System Fan Application T8621A* 1 1 Auto HEAT-AUTO- ON-AUTO Single stage COOL-OFF T8621C 2 1 Auto HEAT-AUTO- ON-AUTO Multistage COOL-OFF T8621D* 2 2 Auto HEAT-AUTO- ON-AU...

Page 4 - SPECIFICATIONS • SELECTION/APPLICATION

4 T8621A,C,D SPECIFICATIONS • SELECTION/APPLICATION Fig. 2—202905AA Remote Temperature Sensor dimensions in in. [mm]. 4 3 32 [104] FRONT 1 3132 [50] SIDE M5244 2 [51] 1 3132 [50] 4164 [16] 38 1 1964 9 64 12 [8] [4] DIA. [13] [35] 1 [25] BACK Fig. 3—Typical thermostat keypad. SYSTEM RUN PROGRAM PERIO...

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