Honewywell CT30/CT33 Low Voltage Thermostat User Guide

Honeywell CT30 and CT33 Low Voltage Thermostat Getting started
Check to make sure your package includes the following items:

Before you begin, make sure you have:

• Screwdriver
• Hammer
• Level (optional)
• Pencil
• Drill bit (3/16” for drywall, 7/32” for plaster)

Remove your old thermostat

1. Turn off power at heating/cooling system (or fuse/circuit-breaker panel).
2. Remove cover and thermostat, but leave wallplate with wires attached.

Did you purchase right thermostat? Count wires to check.
Count the number of wires coming out of the wall and attached to terminals in your old thermostat. If any of them are attached to a terminal marked “C” or “C1” do not count that wire in your total.

If the total (not counting C or C1) is 2 wires, proceed to the next page. If you have 3 or more wires, your new thermostat may not be compatible with your system. Stop installation and call 1-800-468-1502 for advice.

Do you have 3 or more wires? If so, stop now. You may have purchased the wrong replacement thermostat.

Label wires and remove old wallplate
Use a screwdriver to disconnect wires one by one.As you disconnect each wire, wrap it with the label matching the letter on your old thermostat. (Adhesive labels are supplied in your thermostat package.)

Remove the old wallplate only after all wires are labeled. Be careful not to let loose wires fall into the wall opening. Wrap supplied labels securely around each wire, Do not let wires fall into wall opening!

Mount thermostat base:

1. Drill holes at pencil-marked locations (3/16” holes for drywall, 7/32” holes for plaster).
2. Use hammer to tap anchors into holes until flush with wall.
3. [Optional] Pull wires through cover plate (if needed to cover marks left by your old thermostat).
4. Connect wires first (see below), then insert screws. Check level if desired, then tighten screws.

Wire connections

1. Match each labeled wire with same letter on terminal.
2. Use a screwdriver to loosen screw terminals, wrap bare wire securely around terminals, then tighten screws.
3. Push any excess wire back into the wall opening.