Honeywell CT2700 User Manual

Programmable Thermostat

Low Voltage (20 to 30 Vac) Thermostat and Wallplate

Congratulations on the purchase of your new thermostat! Over 100 years of Honeywell engineering expertise went into the making of this thermostat in an effort to provide you with a more comfortable and convenient living environment.

Your new thermostat will automatically control the temperature in your home, keeping you comfortable while saving energy when programmed according to the instructions in this manual.

Direct any questions concerning the application of this thermostat to Honeywell Customer Assistance at 1-800-468-1502, Monday - Friday 7:00 a.m. - 5:30 p.m., Central time.

Programmable Heat and/or Cool

Model CT2700

CT2700

An Electronic Round

USER’S GUIDE

MERCURY SWITCH

TYPICAL LOCATION OF A MERCURY SWITCH IN A THERMOSTAT

RECYCLING THERMOSTAT

If this thermostat is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control, or of an old control containing mercury in a sealed tube.

If you have questions, call Honeywell, Inc. at 1-800-468-1502.

1 PREPARE FOR INSTALLATION

Check Table 1 to make sure this thermostat is

compatible with your system. If not, return to the retailer. For more information, call Honeywell, Inc. at 1-800-468-1502.

M10614

™

X-XX UL

69-1085

CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT

Table 1. Compatibility Chart

System Type Compatible With CT2700

Gas—Standing Pilot Yes Gas—Electronic Ignition Ye s Gas-Fired Boilers Yes

Gas—Millivolt No

Oil-Fired Boilers Yes Oil-Fired Furnace Ye s Electric Furnace Yes Electric Air Conditioning Ye s

Baseboard Electric (120/240 Line Volt) No Heat Pumps/Multistage Equipment No

Not compatible with any 120/240 volt circuit. Not compatible with 2-wire White-Rodgers no. 1361 zone valves.

Not compatible with millivolt systems.

Compatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermostats zone valves

a,b

Acquire tools and items as needed. See Fig. 1.

CROSS-RECESSED SCREWDRIVER

WIRE CUTTER/STRIPPER OR SHARP KNIFE, IF NEEDED TO STRIP WIRES

LEVEL, IF NEEDED TO LEVEL THERMOSTAT FOR APPEARANCE

HAND OR POWER DRILL WITH 3/16 INCH DRILL BIT, IF NEEDED TO DRILL HOLES IN WALL

MASKING TAPE, IF NEEDED TO LABEL WIRES AS DISCONNECTED FROM OLD THERMOSTAT

M878B

Fig. 1. Required installation tools/supplies.

2 REMOVE OLD THERMOSTAT

Test to make certain that your heating and air

conditioning systems (where applicable) are working properly. If either does not work, contact your local heating/air conditioning dealer. To avoid compressor damage, do not operate the cooling system when outdoor temperature is below 50°F (10°C).

CAUTION

Be careful when handling wires during installation. Damage to heating/cooling system possible.

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

Carefully unpack your new thermostat, wallplate,

and decorator cover plate; save package of screws, instructions and receipt.

Remove the cover from the old thermostat. If it does

not snap off when pulled firmly from the bottom, check for a screw used to lock on the cover.

Loosen screws holding thermostat to subbase, wallplate, to wall and lift away.

Disconnect wires from old thermostat or subbase.

As you disconnect each wire, use masking tape to label it with the old terminal designation. If there are only two wires, they do not need labeling. Wrap wires around a pencil to keep them from falling back into the wall as shown in Fig. 2.

WIRES THROUGH WALL OPENING

M5136

Fig. 2. Wrapping wires around pencil.

Replacing Clock With C or C1 Clock Terminals

If you are replacing a Honeywell Chronotherm® Thermostat, you may find one or two wires that go to the C or C1 clock terminals on the Chronotherm® wallplate. Do not allow them to touch, or you can damage your transformer. Disconnect the wires and wrap them separately using electrical tape; do not wrap them together. Place the wires to avoid interfering with the new thermostat operation. Record the colors and terminal designation labels of the remaining wires.

Thermostat wiring

Six or More Wires

If there are six or more wires connected to the thermostat (excluding clock wires attached to terminals), you probably have a variation of a multistage heat pump or other multistage system. The thermostat is not compatible with such systems so return the product to your retailer. If you would like information about which programmable thermostats work with your system, call Honeywell Customer Assistance Center at 1-800-468-1502.

69-1085

CT2700 AN ELECTRONIC ROUND ™ PROGRAMMABLE THERMOSTAT

HEATING RELAY AND FAN COIL

24V

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

M12543

T8700

L1 (HOT)

FAN COIL

COOLING CONTACTOR COIL

24V

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

M12544

T8700

Three Thermostat Wires

If you have three wires for heating only and can operate the fan using the FAN ON switch, this thermostat works with your system. However, some hot water (zoned) heating systems have three thermostat wires. The thermostat will work only if you install an isolating relay on these systems. For details, call Honeywell Customer Assistance Center at 1-800-468-1502.

3 MOUNT WALLPLATE

IMPORTANT

Level for appearance only. The thermostat functions normally even when not mounted level.

Position the decorator cover plate and wallplate on

the wall. Level the wallplate for appearance if desired. Use a pencil to mark the two mounting holes that best fit the application. See Fig. 3.

WALL

DECORATOR COVER PLATE

WALLPLATE

PLASTIC SCREW ANCHOR (2)

4 WIRE WALLPLATE TERMINALS

The CT2700 Thermostat is powered through the heating/ cooling system and is adaptable to most 4-wire, 18 to 30 Vac heating-cooling systems. Refer to Figs. 4 through 6 for some typical system wiring diagrams.

T8700 R G

HEATING

L1 (HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

Fig. 4. CT2700 wiring diagram,

Fig. 5. CT2700 wiring diagram,

PRIMARY CONTROL

24V

4-wire heat/cool system.

2-wire, heat-only system.

FAN RELAY

COOLING CONTACTOR

M12525

Fig. 3. Mounting decorator cover plate and

Remove the decorator cover plate and wallplate

from the wall, and drill two 3/16-inch holes in the wall (if drywall). For firmer wall material such as plaster or wood, drill 7/32-inch holes. Gently tap provided anchors into the drilled holes until flush with the wall.

Reposition the decorator cover plate and wallplate,

pulling wires through the wiring opening. Loosely insert the mounting screws into the holes.

Level for appearance only; the thermostat functions

properly even when not level. Tighten the mounting screws.

wallplate to wall.

M12532

IMPORTANT

Fig. 6. CT2700 wiring diagram,

3-wire, cool-only system.

Use 18-gauge maximum wire to wire the thermostat.

69-1085

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