Honeywell T8700C, T8700B, T8700C1005 User Manual

Programmable Thermostat

68-0197-1

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.

Model

T8700B1007 HEAT-OFF NONE R,W T8700B1015 HEAT-OFF ON-AUTO R,G,W T8700C1005 HEAT-OFF-

System

Selection

COOL

Fan

Selection

ON-AUTO R,G,W,Y

Wiring

Terminals

Used

T8700B,C

An Electronic Round™

PRODUCT DATA

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.

Contents

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 AN ELECTRONIC ROUND™ PROGRAMMABLE THERMOSTAT

SPECIFICATIONS

IMPORTANT

The specifications given in this publication do not include normal manufacturing tolerances; therefore, an individual unit might not exactly match the listed specifications. Also, this product is tested and calibrated under closely controlled conditions and some minor differences in performance can be expected if those conditions are changed.

T8700 TRADELINE® models include a thermostat, wallplate, decorator cover plate and owner’s guide. The package also includes a resistor for use with Taco zone valves. See Fig. 11.

Power:

T8700: 24 Vac nominal, 18 to 30 Vac, 60 Hz.

Electrical Ratings:

Heating: .02 to 1.2A run; 3.5A inrush. Cooling: .02 to 1.2A run; 6.0A inrush. Fan: .02 to 0.5A run; 2.5A inrush.

Current Draw:

T8700 Power Stealing Thermostat requires only 2.5 mA current draw when the thermostat calls for heat or cool and is compatible with most 24V systems. It can be used in most non-millivolt applications. See Power Stealing in the Operation section.

Temperature Adjustment:

Setpoint temperature is adjusted by using the or keys. One press changes the setpoint one degree; pressing and holding changes the setpoint several degrees.

Cycle Rates (at 50 Percent Load):

Heating: Selectable at 1, 3, 6 or 9 cph. See Table 2 for

heating cycle rates and corresponding system equipment.

Cooling (T8700C): Fixed at 3 cph.

Table 2. Heating Cycle Rates.

Cycles per

System

Hour (cph)

Steam, Gravity 1 Hydronic Heat, Condensing Gas Furnaces 3 Gas or Oil Forced Air 6 Electric Furnace 9

Finish:

T8700: Premier White® color.

Dimensions:

See Fig. 1.

1-1/2

5-1/2

4-1/4

3-1/2

Temperature Setting Range:

40°F (4°C) to 99°F (37°C).

Set

Operational Ambient Temperature Range:

30°F (4°C) to 110°F (43°C).

Shipping Temperature Range:

-20°F (29°C) to 120°F (49°C).

Operating Relative Humidity:

5% to 90% RH, noncondensing.

M12579

DECORATOR COVER PLATE

Fig. 1. T8700 Thermostat dimensions (T8700C shown).

T8700

THERMOSTAT

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for the complete ordering number.

1. Order number.

2. Accessory, if desired.

If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Home and Building Control Sales Office (check white pages of your phone directory).

2. Home and Building Control Customer Logistics 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.

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T8700B,C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT

INSTALLATION

When Installing this Product…

1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After installation is complete, check out product operation as provided in these instructions.

CAUTION

Damage To Heating/Cooling System Possible. Be careful when handling wires during installation.

Disconnect power at furnace or at main breaker/fuse box before starting installation.

RECYCLING NOTICE

If this control is replacing a control that contains mercury in a sealed tube, do control in the trash.

Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control containing mercury in a sealed tube.

not

place your old

Location

Install the thermostat about 5 ft (1.5m) above the floor in an area with good air circulation at average temperature. See Fig. 2. Do not install the thermostat where it can be affected by: —Drafts or dead spots behind doors and in corners. — Hot or cold air from ducts. — Radiant heat from the sun or appliances. — Concealed pipes and chimneys. — Unheated (uncooled) areas such as an outside wall

behind the thermostat.

Mounting Decorator Cover Plate and Wallplate to Wall

IMPORTANT

Position and level the wallplate for appearance only. The thermostat functions properly even when not level.

Mount decorator cover plate (if desired), wallplate, T8700 and the screws as follows; see Fig. 3:

1. Place the decorator cover plate and the wallplate on the

desired wall location.

2. Pull the thermostat wire through the entrance hole on

the decorator cover plate, then through the wallplate entrance hole.

3. Plug the wiring hole behind the thermostat to prevent

drafts from affecting the thermostat.

4. Select the two mounting holes that best fit the

application.

5. Fasten the decorator cover plate and the wallplate to

the wall using the provided anchors (if necessary) and screws.

YES

5 FEET

[1.5 METERS]

Fig. 2. Typical thermostat location.

M12524

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T8700B,C AN ELECTRONIC ROUND™ PROGRAMMABLE THERMOSTAT

WALL

DECORATOR COVER PLATE

WALLPLATE

WHEN USING WALL ANCHORS, DRILL 3/16 INCH HOLES FOR DRYWALL, 7/32 INCH HOLES FOR PLASTER OR WOOD.

Fig. 3. Mounting decorator cover plate and wallplate on wall (T8700C shown).

PLASTIC SCREW ANCHOR (2)

M12532A

ROUTE WIRING AS SHOWN THROUGH ENTRANCE HOLE

MOUNTING SCREW HOLE

WIRING ENTRANCE HOLE

ALTERNATE MOUNTING

SCREW HOLE

MOUNTING

ALTERNATE

MOUNTING

SCREW HOLE

SCREW

HOLE

M12529

Fig. 4. T8700C wallplate wiring connections.

(Refer to Table 1 for T8700B wiring connections.)

The shape of the terminals permits insertion of straight or wraparound wiring connections; either method is acceptable. See Fig. 5.

Wiring

CAUTION

Damage To Heating/Cooling System Possible. Be careful when handling wires during installation.

Disconnect power at furnace or at main breaker/fuse box.

IMPORTANT

Use an 18-gauge maximum wire for wiring the T8700 Thermostat.

All wiring must comply with local electrical codes and ordinances. A letter is located near each terminal for identification.

NOTE: To ensure proper mounting of thermostat, restrict all

wiring to the left side of the terminals. See Fig. 4.

FOR WRAPAROUND, STRIP 7/16 IN. (11 mm)

FOR STRAIGHT INSERTION, STRIP 5/16 IN. (8 mm)

M12537

Fig. 5. Wiring connections.

The T8700 Thermostat steals power through the heating and/or cooling system controls and is adaptable to most, 24 Vac systems. Refer to Fig. 6 through 11 for typical wiring hookups.

24V

T8700B

FAN RELAY

HEATING PRIMARY CONTROL

M16005B

L1 (HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

Fig. 6. T8700B1007 Heat Only wiring diagram

T8700B1015 Heat Only with Fan includes dotted line.

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