Honeywell CT30 Series Low-Voltage Thermostat

Honeywell CT30 Series Low-Voltage Thermostat

Getting started

Check package contents:

  • Thermostat
  • Coverplate
  • Wall anchors & screws (2 each)
  • Caution card
  • Wire labels

Before you begin, make sure you have:

  • No. 2 Phillips & small pocket screwdrivers
  • Hammer
  • Level (optional)
  • Pencil
  • Drill and bit (3/16” for drywall, 7/32” for plaster)

Remove your old thermostat

TURN OFF POWER at heating/cooling system (or fuse/circuit-breaker panel).
Remove cover and thermostat, but leave wallplate with wires attached.

Remove your old thermostat

MERCURY NOTICE
If your old thermostat contains mercury, contact your local waste management authority for proper disposal instructions.

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.

Label wires and remove old wallplate
  • For CT30/CT33: If your old thermostat has 3 or more wires (not counting terminals C or C1), you may have purchased the wrong replacement thermostat. Stop now and call
    1-800-468-1502 for advice.
  • For CT31: If your old thermostat has 5 or more wires (not counting terminals C or C1), you may have purchased the wrong replacement thermostat. Stop now and call
    1-800-468-1502 for advice.

Mark mounting position

Mark mounting position

Mount thermostat base – CT30/CT33

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 page 4), then insert screws. Check level if desired, then tighten screws.

Mount thermostat base – CT31

Mount thermostat base - CT31
  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. Pull wires through thermostat base and insert screws. Check level if desired, then tighten screws.

Connect wires

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

Labels don’t match?
If labels do not match letters on thermostat, see table below.

Labels don't match

Connect to
Existing wires            CT30/CT33                 CT31

• RH • • VTerminal “RTerminal “R
• W1 • HTerminal “WTerminal “W
• Y1 • M[1]Terminal “Y”
• F[1]Terminal “G
Rc[1][1]

[1] If this wire is present, you may have purchased the wrong thermostat. Call 1-800-468-1502 for help. M29584
CT33 model is for 750 MV heat only

Set adjustment lever (CT30/CT31 only)

  1. Separate cover from thermostat, and remove the insert.
  2. Use a pencil to move the adjustment lever to the proper setting for your system (see table below).
Set adjustment lever

Your system                                                                      Setting
Gas or oil furnace (less than 90% efficiency)                      0.4
Electric furnace (any type)                                                  0.3
High efficiency furnace (more than 90% efficiency)           0.8
Hot water system                                                                0.8
Gas/oil steam or gravity system                                          1.2

Finish installation

Finish installation
  1. Mount thermostat on base and tighten three mounting screws (CT31 only).
  2. Align the 3 tabs on the cover with slots on the thermostat, then push gently until the cover snaps into place.
  3. Restore power at the heating/cooling system, or at the fuse/circuit-breaker panel.

Operation

System off (select models)
Move lever to far left to turn off heating system.

Operation

Temperature setting
Adjust to set desired indoor temperature.

Fan switch (CT31)
Auto: Fan runs only when heating or cooling system is on.
On: Fan runs continuously.

System switch (CT31)
Cool: Controls the cooling system.
Heat: Controls the heating system.
Off: All systems are off.

CAUTION: EQUIPMENT DAMAGE HAZARD (CT31).
Do not operate cooling system when outdoor temperature is below 50°F (10°C).

1-year limited warranty

Resideo warrants this product, excluding battery, to be free from defects in workmanship or materials, under normal use and service, for a period of one (1) year from the date of first
purchase by the original purchaser. If at any time during the warranty period the product is determined to be defective due to workmanship or materials, Resideo shall repair or replace it
(at Resideo’s option).

If the product is defective, (i) return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or (ii) call Resideo Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Resideo Return Goods, 1985 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can be sent to you.

This warranty does not cover removal or reinstallation costs.
This warranty shall not apply if it is shown by Resideo that the defect was caused by damage which occurred while the product was in the possession of a consumer.

Resideo’s sole responsibility shall be to repair or replace the product within the terms stated above. RESIDEO SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT.

Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.

THIS WARRANTY IS THE ONLY EXPRESS WARRANTY RESIDEO MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.

This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions concerning this warranty, please write Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.

Need Help?
For assistance with this product please visit honeywellhome.com
or call Resideo Customer Care toll-free at 1-800-468-1502

Documents / Resources

Honeywell CT30 Series Low-Voltage Thermostat [pdf] Owner’s Manual
CT30 Series, Low-Voltage Thermostat

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