Instruction/ maintenance manual of the product CHRONOTHERM T8621A Honeywell
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1 68-0058—1 T8621A,C,D Chr onotherm™ III Fuel Sa v er 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.
2 T8621A,C,D SPECIFICATIONS • ORDERING INFORMATION Specif ications IMPORTANT: The specifications given in this publica- tion do not include normal manufacturing toler- ances.
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.
4 T8621A,C,D SPECIFICATIONS • SELECTION/APPLICATION Fig. 2—202905AA Remote Temperature Sensor dimensions in in. [mm]. 4 3 32 [104] FRONT 1 31 32 [50] SIDE M5244 2 [51] 1 31 32 [50] 41 64 [16] 3 8 1 19 64 9 64 1 2 [8] [4] DIA. [13] [35] 1 [25] BACK Fig.
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10 Fig. 9—T8621C 2-stage heat/1-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C FOR THERMOSTAT OPERATION.
11 68-0058—1 Fig. 10—T8621D 2-stage heat/2-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. APPLICABLE ONLY ON T8621D MODEL WITH REMOTE SENSOR. RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 ft. [61 m] MAXIMUM LENGTH.
12 T8621A,C,D INSTALLATION Fig. 11—T8621D 2-stage heat/2-stage cool thermostat with HEAT-OFF-COOL system and AUTO-ON fan switching; auto fan on heat and cool; convertible to auto fan on cool only. FOR ELECTRIC HEAT APPLICATIONS (AUTO FAN OPERATES WITH W1 AND Y1).
13 68-0058—1 T8621A,C,D INSTALLATION Fig. 12—T8621C,D single stage heat pump with heating changeover. HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. M1547C SYSTEM TRANSFORMER R C W1 W2 Y2 Y1 G RC FAN RELAY HIGH LIMIT HIGH LIMIT L1 (HOT) L2 HEAT AUTO COOL SYSTEM SWITCH AUTO ON FAN SWITCH T8621D ONLY.
14 T8621A,C,D INSTALLATION Fig. 13—T8621C,D single stage heat pump with cooling changeover. HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. 4 5 6 RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 ft. [61 m] MAXIMUM LENGTH. ROUTE INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.
15 68-0058—1 T8621A,C,D INSTALLATION Fig. 14—T8621D single stage heat pump. HEAT-OFF-COOL system and AUTO-ON fan switching. M1546 A SYSTEM TRANSFORMER R C W1 W2 B HEATING CHANGEOVER RELAY O Y2 Y1 .
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17 68-0058—1 T8621A,C,D INSTALLATION • CHECKOUT Fig. 17 — Mounting thermostat on subbase. M 843 PM MORNIMG MON HEAT ON ROOM SYSTEM A U T O P M M O R N IM G M O N H E A T O N R O O M SYSTEM RUN P.
18 System Press Look For This Response Switch This Key Position Key Down Key Released OFF 06 Blank 02 Blank 05 Blank 04 Blank 01 Blank 00 Blank (CHECK 12 See note A . EACH POSITION) OFF 08 Blank 1 3 Microprocessor mask no. and revision no. 09 Blank 14 Blank HEAT or 14 1st stage heating and AUTO SYSTEM LED on.
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) 01 13 29 36 Third Manual or.
20 T8621A,C,D PROGRAMMING THE THERMOSTAT STEP 2 SET THE PROGRAM TIMES AND TEMPERATURES FOR ONE DAY Choose a day to program first. Monday is used in the examples. Start by pro- gramming the MORNING time and temperatures. The thermostat requires a MOR NING program every day.
21 68-0058—1 T8621A,C,D PROGRAMMING THE THERMOSTAT Program the EVENING time and tem- perature, if desired. Program the NIGHT time and tempera- ture, if desired. Set the cooling temperatures for all the periods programmed.The program times are the same for both heating and cool- ing.
22 T8621A,C,D PROGRAMMING THE THERMOSTAT Press and release. The display shows the preprogrammed cooling tempera- ture a nd the programmed start time for MORNING. Press and hold until the display shows the desired cooling temperature for MORNING. Press and release.
23 68-0058—1 T8621A,C,D PROGRAMMING THE THERMOSTAT NOTE: The display will show 32 ° F instead of the current temperature until the thermostat is mounted on the subbase and the system is pow- ered.
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25 68-0058—1 T8621A,C,D PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT Operating the Thermostat TEMPORARILY CHANGING THE PROGRAM These features allow customizing the program for those times when someone comes home early, is working late or planning to be out for the evening.
26 T8621A,C,D OPERATING THE THERMOSTAT Press and hold the Time or Temperature keys until the display shows the desired new program. Press and release. The next day will flash on the display. Press COPY TO to copy into, or DAY to bypass, the day. Continue until the program has been copied into all desired days.
27 68-0058—1 T8621A,C,D OPERATING THE THERMOSTAT CHECKING THE PROGRAM TIMES AND TEMPERATURES If desired, check all the stored set- tings without affecting the perma- nent program. CHECKING THE CURRENT TEMPERATURE SETTING Press a single key to compare actual room temperature to the setting at any time.
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 and cooling equipment during recovery from an energy sav- ings setting to a comfort setting.
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.
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 when asleep or away.
31 68-0058—1 T8621A,C,D TABLE OF CONTENTS T able of Contents page Specifications ................................................................................................................. ..................................................... 2 Ordering Information .
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, Ontario M1P 2V9 Printed in U.
An important point after buying a device Honeywell CHRONOTHERM T8621A (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
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If you already are a holder of Honeywell CHRONOTHERM T8621A, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Honeywell CHRONOTHERM T8621A.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell CHRONOTHERM T8621A. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell CHRONOTHERM T8621A along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
