Honeywell T8621A - Manuals - manualsarea.com

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...

Page 10 - INSTALLATION

10 Fig. 9—T8621C 2-stage heat/1-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ONfan switching. NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C FOR THERMOSTAT OPERATION. DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION. M5233 HEATINGTRANSFORMER R C W1 W2 HEAT RELAY 1 HEAT RELAY 2 CO...

Page 13 - AA

13 68-0058—1 T8621A,C,D INSTALLATION Fig. 12—T8621C,D single stage heat pump with heating changeover. HEAT-AUTO-COOL-OFF system andAUTO-ON fan switching. M1547C SYSTEMTRANSFORMER R C W1 W2 Y2 Y1 G RC FAN RELAY HIGHLIMIT HIGHLIMIT L1(HOT) L2 HEAT AUTO COOL SYSTEMSWITCH AUTO ON FANSWITCH T8621D ONLY. ...

Page 15 - ADJUSTING CYCLE RATE; To customize the thermostat cycling performance to

15 68-0058—1 T8621A,C,D INSTALLATION Fig. 14—T8621D single stage heat pump. HEAT-OFF-COOL system and AUTO-ON fan switching. M1546A SYSTEMTRANSFORMER R C W1 W2 B HEATINGCHANGEOVER RELAY O Y2 Y1 G RC COMPRESSOR CONTACTOR COOLING CHANGEOVER RELAY FAN RELAY HEAT 2 HEAT 1 HIGHLIMIT HIGHLIMIT L1(HOT) L2 H...

Page 17 - INSTALLATION • CHECKOUT; HEATING; CAUTION; FAN; Checkout

17 68-0058—1 T8621A,C,D INSTALLATION • CHECKOUT Fig. 17—Mounting thermostat on subbase. M 843 PM MORNIMG MON HEAT ON ROOM SYSTEM AUTO PM MORNIMG MON HEAT ON ROOM SYSTEM RUN PROGRAM TIME TEMPERATURE PRESENT SETTING SKIP NEXT PERIOD CHANGETO LAST PERIOD SET PRESENTDAY/TIME HOLDTEMP DAY SET HEAT/COOL C...

Page 19 - CHECKOUT • PROGRAMMING THE THERMOSTAT; Programming the Thermostat

19 68-0058—1 T8621A,C,D CHECKOUT • PROGRAMMING THE THERMOSTAT Cycle Rate Setting (cph at 50% on time for stage First 1 on 1-heat models, stage Digit 2 on 2-heat models) 0 1 1 3 2 9 3 6 Third Manual or Auto System Switch Digit Changeover Position 0 Manual HEAT or OFF 1 Auto HEAT or OFF 3 Auto AUTO 4 ...

Page 22 - PROGRAMMING THE THERMOSTAT

22 T8621A,C,D PROGRAMMING THE THERMOSTAT Press and release. The display showsthe preprogrammed cooling tempera-ture and the programmed start time forMORNING. Press and hold until the display showsthe desired cooling temperature forMORNING. Press and release. The display showsthe preprogrammed coolin...

Page 25 - PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT; Operating the Thermostat

25 68-0058—1 T8621A,C,D PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT Operating the Thermostat TEMPORARILY CHANGINGTHE PROGRAM These features allow customizing theprogram for those times when someonecomes home early, is working late orplanning to be out for the evening. Changes made with the...

Page 26 - OPERATING THE THERMOSTAT

26 T8621A,C,D OPERATING THE THERMOSTAT Press and hold the Time or Temperaturekeys until the display shows the desirednew program. Press and release. The next day willflash on the display. Press COPY TOto copy into, or DAY to bypass, theday. Continue until the program hasbeen copied into all desired ...

Page 28 - OPERATION; When Adaptive Intelligent RecoveryTM is Used; Operation

28 T8621A,C,D OPERATION ADAPTIVE INTELLIGENT RECOVERY™OPERATION Adaptive Intelligent Recovery™ is the Honeywell trade- mark for the way the T8621 controls the heating andcooling equipment during recovery from an energy sav-ings setting to a comfort setting. During recovery, thecontrol point changes ...

Page 29 - TROUBLESHOOTING; Troubleshooting

29 68-0058—1 T8621A,C,D TROUBLESHOOTING AUTOMATIC THERMOSTAT HEATING OR COOLING TEMPERATURE CAN NOT BE SET CLOSER THAN 3 F O THERMOSTAT MOUNTED INCORRECTLY ON BASE BATTERIES ARE INCORRECTLY INSTALLED SYMPTOM POSSIBLE CAUSE ACTION NO ac POWER TO THERMOSTAT CHECK POWER TO FURNACE OR AIR CONDITIONER. –...

Page 30 - GLOSSARY; Glossary

30 T8621A,C,D GLOSSARY Glossary Comfort temperature The temperature desired when active and occupying the building. Energy-saving temperature The lower (heating) or higher (cooling) temperature that allows savings on heating and cooling costs whenasleep or away. Also called the setback (heating) ors...

Page 31 - TABLE OF CONTENTS; Table of Contents; page

31 68-0058—1 T8621A,C,D TABLE OF CONTENTS Table of Contents page Specifications ...................................................................................................................................................................... 2Ordering Information ..................................

Page 32 - Honeywell Limited—Honeywell Limitée

32 Home and Building Control Home and Building Control Honeywell Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, MN 55422 Scarborough, OntarioM1P 2V9 Printed in U.S.A.

Honeywell T8621A - Manuals

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