Honeywell CT31 Low Voltage Thermostat Owner’s Manual

Honeywell CT31 Manual: Questions and Answers

What do the terminals on a Honeywell CT31 thermostat mean?

Owner's Manual, p. 2

Where do I mark the screw holes when installing a Honeywell CT31?

After leveling the base or cover plate, mark both screw hole positions with a pencil. Owner's Manual, p. 3

What drill bit size do I need for the Honeywell CT31 installation?

Use 3/16" holes for drywall, 7/32" holes for plaster. Owner's Manual, p. 4

Can I install a Honeywell CT31 if I have more than 4 wires from my old thermostat?

Don't count wires attached to terminals marked C or C1. If you have 5 or more wires after excluding those, the thermostat may not be compatible with your system; call 1-800-468-1502. Owner's Manual, p. 2

What do the fan switch settings do on a thermostat?

On runs the fan continuously. Auto runs it only when heating or cooling is active. Owner's Manual, p. 6

What do the buttons on the Honeywell CT31 system switch control?

Cool controls only the cooling system. Heat controls only the heating system. Off turns both systems off. Owner's Manual, p. 6

How do I set the adjustment lever on the Honeywell CT31?

Separate the cover and remove the plastic insert. Use a pencil to move the lever to match your system type.

1. For gas or oil furnace under 90% efficiency, set to 0.4.
2. For electric furnace any type, set to 0.3.
3. For high efficiency furnace over 90% efficiency, set to 0.8.
4. For hot water system, set to 0.8.
5. For gas/oil steam or gravity system, set to 1.2. Owner's Manual, p. 5

What does the temperature lever on the Honeywell CT31 do?

Move it to adjust the desired indoor temperature setting. Owner's Manual, p. 6

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