APPLICATION
The T8000C, T8001C and T8024D Programmable
Thermostats provide programmable temperature control for
24 Vac heating-cooling systems with manual changeover
from heat to cool. The T8000C and T001C provide single-
stage heating and cooling control and the T8024D provides
two-stage heating and two-stage cooling contorl. Heating
cycle rates are selectable at 1, 3, 4, 5, 6, 9, or 12 cph.
Cooling cycle rates are fixed at 3 cph. Temperature indication
can be set for °F or °C.
The T8000C is powered through the heating/cooling system
controls. The T8001C and T8024D are powered directly
through the system transformer.
® U.S. Registered Trademark
Copyright © 2001 Honeywell •
T8000C, T8001C,T8024D
Programmable Thermostats
• All Rights Reserved
FEATURES
• Attractive styling complements any decor to the
homeowner s delight.
• Preprogrammed for your convenience.
• Program up to four time periods and temperature
setpoints to complement your lifestyle.
• Programs are permanently held in non-volatile memory
in the event of a power failure.
• Indefinite setpoint temperature hold for added comfort
and energy savings.
• Ease-of-use means fewer homeowner questions and
increased homeowner satisfaction.
• Large temperature display for quick easy readability.
• Conveniently sized thermostat (5-1/2 x 3-1/2) with
optional decorator cover plates (7-3/8 x 5-3/4) make it
easy to install in a variety of locations.
• Keys are located by the display for easy access.
• FAN and SYSTEM switches are located on the lower
edge to eliminate accidental setting changes.
• Easy installation, setup and self-test saves time and
increases installer productivity.
• Manual changeover from heat to cool eliminates
unexpected system operation.
°
°
•
F or
C temperature display for added model flexibility.
• Selectable heating cycle rate (1, 3, 4, 5, 6, 9 or 12 cph) for
a variety of applications which reduces the amount of
inventory.
• Cooling cycle rate is fixed (3 cph), the standard setting
for compressors, for speedy installation.
• Setpoints are permanently held in non-volatile memory
(no batteries required) and retained during power
outages for increased installer and homeowner
convenience.
• Power stealing and hardwired models available for
virtually all equipment and application needs including;
gas, oil and electric forced air, condensing gas furnaces,
forced air zoning systems, single stage heat pumps,
hydronic heat, gravity and radiant floor heat systems.
Application .......................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Installer Setup ..................................................................... 6
Operation ............................................................................ 8
Checkout ............................................................................. 9
Troubleshooting .................................................................. 12
PRODUCT DATA
Contents
68-0195-2
Table of Contents
Related Manuals for Honeywell T8024D
Summary of Contents for Honeywell T8024D
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Page 1: Table Of Contents
24 Vac heating-cooling systems with manual changeover from heat to cool. The T8000C and T001C provide single- stage heating and cooling control and the T8024D provides two-stage heating and two-stage cooling contorl. Heating cycle rates are selectable at 1, 3, 4, 5, 6, 9, or 12 cph. -
Page 2: Specifications
Honeywell, 1885 Douglas Drive North, MN10-1461 Golden Valley, Minnesota 55422-4386 1-800-468-1502 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A. -
Page 3: Installation
Mount wallplate and the T8000C/T8001C with the screws provided (see Fig. 3) as follows: T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS MERCURY NOTICE If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. - Page 4 The T8001C Thermostats are adaptable to most 18 to 30 Vac single-stage heating/cooling systems and the T8024D is adaptable to multistage systems. All T8001C and T8024D thermostats require a common wire connected to the system transformer to operate properly.
- Page 5 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. POWER TO R TERMINAL IS REQUIRED WHEN THE SYSTEM SWITCH IS IN THE OFF POSITION. Fig. 7. T8000C wiring diagram in heat/cool system with two transformers. T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS COOL DAMPER HEAT DAMPER CHANGEOVER CONTROL 1 JUMPER R TO RC.
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Page 6: Installer Setup
TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Fig. 11. T8024D multistage heat/cool wiring diagram. Setting Fan Operation (Fuel) Switch The fan operation (fuel) switch is preset at the factory in the F position. See Fig. 11. This is the correct setting for most systems. - Page 7 The five minute minimum off time is bypassed. NOTE: For T8024D, a second press on the 2nd stage. CAUTION Allow compressor to remain off for 5 minutes before restarting.
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Page 8: Operation
T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS OPERATION Setting FAN and SYSTEM Switches Fan and system settings are controlled manually by using the switches located at the bottom of the thermostat case. See Fig. 14. H o l d S L E E T8000 Fig. -
Page 9: Checkout
Press to set SLEEP time. Press Select. Press to set SLEEP temperature. T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS 11. End Programming. Press Select. End is displayed. Programming is complete. The thermostat will revert to displaying the M12630A current day, time and temperature in five seconds. - Page 10 See Fig. 15 and 16. Previous Honeywell power stealing thermostats required 80 mA of load current when the heating and cooling was on. The T8000C Thermostat requires only 2.5 mA of load current (1/32 of previous models) when the heating or cooling is on.
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Page 11: Sequence Of Operations
1 and 2. FAN Switch Settings SYSTEM Switch Settings Auto Auto Cool Auto Heat When the Fuel switch is in the E position. T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS THERMOSTAT SYSTEM SWITCH HEAT COOL SWITCH AUTO Fig. 16. T8001C hardwired internal schematic. -
Page 12: Troubleshooting
T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS TROUBLESHOOTING T8000/T8001 SYMPTOM HEATING OR COOLING EQUIPMENT WON'T OPERATE. IS FLASHING AND COOLING WILL NOT OPERATE PARTIAL DISPLAY NO DISPLAY TEMPERATURE DISPLAY IS INCORRECT. TEMPERATURE SETTINGS WILL NOT CHANGE. (EX: CANNOT SET THE HEATING HIGHER OR THE COOLING LOWER).