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Honeywell T8700B Product Data

An electronic round programmable thermostat
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T8700C

APPLICATION

The T8700 Electronic Round™ Programmable Thermostats
provide single-stage, programmable temperature control for
24V heating and/or cooling systems. See Table 1 for model
descriptions.
Table 1. T8700 Thermostat Description.
System
Model
Selection
T8700B1007
HEAT-OFF
T8700B1015
HEAT-OFF
T8700C1005
HEAT-OFF-
COOL
® U.S. Registered Trademark
Copyright © 1998 Honeywell Inc.

Programmable Thermostat

Wiring
Fan
Terminals
Selection
Used
NONE
R,W
ON-AUTO
R,G,W
ON-AUTO
R,G,W,Y
• All Rights Reserved
An Electronic Round

FEATURES

• Attractive neutral styling complements any decor.
• Easy-to-use means fewer homeowner questions and
increased homeowner satisfaction.
• Large easy-to-read display.
• Keys located near the display for easy access.
• Fan and System switches are located on the top of the
wallplate to eliminate accidental setting changes.
• Quick and easy installation.
Two-period programming for added energy savings.
• Manual changeover from heat to cool eliminates
unexpected system operation (T8700C).
• °F or °C temperature display for added model
flexibility.
• Selectable heating cycle rate (1, 3, 6 or 9 cph) allows a
variety of applications and reduced inventory.
• Cooling (T8700C) cycle rate fixed at 3 cph (the standard
setting for compressors) allows a speedy installation.
• Programming permanently held in memory (no
batteries needed) and retained during power outages
for increased installer and homeowner convenience.
• Compatible with most equipment and application
needs including gas, oil and electric forced air;
condensing gas furnaces; hydronic heat; and gravity
and radiant heat systems.
• Powerstealing eliminates need to run additional wires.
Application ........................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Settings and Adjustments ................................................... 6
Setting the Clock ................................................................. 7
Programming ....................................................................... 7
Operation ............................................................................ 8
Checkout ............................................................................. 10
Troubleshooting ................................................................... 11
T8700B,C
PRODUCT DATA
Contents
68-0197-1

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  Summary of Contents for Honeywell T8700B

  • Page 1: Table Of Contents

    Installation ................3 Settings and Adjustments ........... 6 Setting the Clock ..............7 Programming ............... 7 Operation ................8 Checkout ................10 Troubleshooting ..............11 ® U.S. Registered Trademark 68-0197-1 Copyright © 1998 Honeywell Inc. • • All Rights Reserved...
  • Page 2: Specifications

    Honeywell Inc., 1985 Douglas Drive North Minneapolis, Minnesota 55422-4386 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

    T8700B,C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT INSTALLATION Location Install the thermostat about 5 ft (1.5m) above the floor in an area with good air circulation at average temperature. See When Installing this Product… Fig. 2. Do not install the thermostat where it can be affected by: 1.
  • Page 4 M12529 SCREW HOLE Fig. 4. T8700C wallplate wiring connections. (Refer to Table 1 for T8700B wiring connections.) WHEN USING WALL ANCHORS, DRILL 3/16 INCH HOLES FOR DRYWALL, 7/32 INCH HOLES FOR PLASTER OR WOOD. The shape of the terminals permits insertion of straight or M12532A wraparound wiring connections;...
  • Page 5 T8700B,C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT T8700 T8700 T8700 T8700 COOLING CONTACTOR (HOT) HEATING RELAY PRIMARY CONTROL (HOT) V8043E V8043E V8043E POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M13207 Fig. 7. T8700C heat-cool wiring diagram in single trans- former system with gas or electric heat/electric cooling.
  • Page 6: Settings And Adjustments

    Slide the Fan switch on the thermostat to the desired fan setting. System Switch BOTTOM CENTER The T8700B System switch controls the thermostat as follows: NOTCH HEAT: The thermostat controls the heating system. ALIGN AND ATTACH BOTTOM CENTER NOTCHS ON THERMOSTAT/WALLPLATE.
  • Page 7: Setting The Clock

    6. Run program. position and enter the cooling temperature settings. Press the once. You have IMPORTANT completed your When programming the T8700B, first move the program changes. System switch to the heat position. M12511 End is displayed for five seconds indica-...
  • Page 8: Operating The Thermostat

    T8700B,C AN ELECTRONIC ROUND™ PROGRAMMABLE THERMOSTAT Operating the Thermostat 2. Select Cycles Per Hour. The display changes to To Display Temperature show current cycle Setting. rate setting. Press once to display present tempera- M12520 ture setting. After approxi- select 1, 3, 6, or 9 cph.
  • Page 9: Operation

    T8700B,C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT OPERATION Fan Control The FAN switch settings for the T8700B1015 with Fan and T8700C are ON and AUTO. Zero Droop Performance ON: The fan runs continuously. The T8700 Thermostat can control temperature closer to AUTO: In cooling, the fan starts and stops with the cooling setpoint than electromechanical thermostats.
  • Page 10: Checkout

    Cooling G, Y AUTO HEAT Heating When fuel switch is in the E position. (T8700B with Fan and T8700C). T8700C only. CHECKOUT IMPORTANT A mimimum off-timer for the T8700C assures that the cooling compressor does not come on again for at Heating (T8700B,C) least five minutes after it turns off.
  • Page 11: Troubleshooting

    T8700B,C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT TROUBLESHOOTING Symptom Possible Cause Corrective Action Heating/cooling No ac power. Check power to heating/cooling equipment: equipment does not — On/Off switch. operate. — Fuse or circuit breaker. — Loose 24V connection: at thermostat; at furnace/air conditioner.
  • Page 12 T8700B,C AN ELECTRONIC ROUND™ PROGRAMMABLE THERMOSTAT Home and Building Control Home and Building Control Honeywell Asia Pacific Inc. Honeywell Inc. Honeywell Limited-Honeywell Limitée Room 3213-3225 Honeywell Plaza 155 Gordon Baker Road Sun Hung Kai Centre P.O. Box 524 North York, Ontario No.

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