Honeywell/20 Programmable Thermostat Owners Guide

Honeywell/20 Programmable Thermostat Manual

Weekday/Weekend (5-day/2-day), Programmable Heat and/or Cool, Low Voltage (20 to 30 Vac), Thermostat and Mounting Plate Model CT2095

Welcome to the world of comfort and energy savings with your new Honeywell Programmable Thermostat.

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 Honeywell/20 Programmable Thermostat Manual.

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

Honeywell/20 Programmable Table of Content

Step 1. Prepare for Installation ............................................................ 4
Step 2. Remove Old Thermostat ......................................................... 6
Step 3. Install Batteries ...................................................................... 8
Step 4. Program Thermostat .............................................................. 11
Step 5. Adjust Fan Operation Switch, As Required .............................. 19
Step 6. Adjust System On-Time, °F/°C, As Required ........................... 19
Step 7. Mount Thermostat Mounting Plate ........................................... 21
Step 8. Wire Thermostat Terminals ..................................................... 23
Step 9. Mount Thermostat .................................................................. 27
Step 10. Check Thermostat Operation After Programming and Installing . 28
Step 11. Set Fan and System Switches ............................................... 30
Troubleshooting Guide ........................................................................ 31
Limited One-Year Warranty ................................................................. 35

Step 1. Honeywell/20 Programmable Prepare for Installation

  • Check Table 1 to make sure this thermostat is compatible with your system. If not, return it to the retailer. For more information, call Honeywell Consumer Services, 1-800-468-1502, Monday - Friday, 7 am to 5:30 pm, Central time.

Table 1. Compatibility Information.

System Type

Compatible with CT2095

Gas—Standing Pilot

Yes

Gas—Electronic Ignition

Yes

Gas-Fired Boilers

Yesa,b

Gas—Millivolt

No

Oil-Fired Boilers

Yesa,b

Oil-Fired Furnace

Yes

Electric Furnace

Yes

Electric Air Conditioning

Yes

Baseboard Electric (120/240 Line Volt)

No

Heat Pumps/Multistage Equipment

No

Not compatible with any 120/240 volt circuit.

  • a Compatible with Honeywell 2-wire zone valves. Isolating relay required for 3-wire thermostats for zone valves. Not compatible with 2-wire White-Rodgers no. 1361 valves.
  • b Compatible with hot water baseboard systems. Does not work efficiently on steam or gravity systems

 

  • Acquire tools and items as needed (see illustration). Also purchase two AA alkaline batteries; we recommend Energizer® batteries.

Honeywell/20 Programmable Thermostat

Step 2. Honeywell/20 Programmable Remove Old Thermostat

  • Test to be sure your heating and cooling systems 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).
  • Turn off power to the system at the furnace, or at the fuse/circuit breaker panel.
  • Carefully unpack your new thermostat and mounting plate, saving package of screws, instructions and receipt.
  • Remove cover from old thermostat. If it does not snap off when pulled firmly from the bottom, check for a screw used to lock on the cover.

Replacing a Clock Thermostat that has 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® Thermostat wiring 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 where they do not interfere with the operation of the new thermostat. Record the colors and terminal designation labels of the remaining wires.

Six or more wires?

If there are six or more wires (excluding clock wires attached to terminals), you probably have a variation of a heat pump or multistage system. This thermostat is not compatible with those systems so return the product to theretailer. If you want information about the programmable thermostats that work with your system

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 does not work without installing an isolating relay on these systems

Step 3. Honeywell/20 Programmable Install Batteries

IMPORTANT
Batteries must be installed for the programming and operation of the thermostat and heating/cooling system.

  • Purchase two AA alkaline batteries; nonalkaline batteries do not last as long, and can leak, causing damage to the thermostat or the wall surface. We recommend Energizer® batteries.
  • Open the top cover of thermostat to access control panel and battery compartment.
  • Make sure the thermostat is set to the Off position.
  • Use a coin to remove the battery cover.

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