Honeywell CT30/CT33 Low Voltage Thermostat User Manual

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 G/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.

MERCURY NOTICE: Do not place your old thermostat in the trash if it contains instructions regarding recycling and proper disposal.

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.

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!
IGNORE WIRE COLORS: Use only letter designations to identify wire types.

Mark mounting position

Mount thermostat base

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

Wire connections

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

Labels don’t match?

If labels do not match letters on thermostat, see table below.

Existing wires	Connect to:
RRH4*V	Terminal “R”
WW1H	Terminal “W”
YY1M	Stop! See note
G*F	Stop! See note
Rc	Stop! See note

Note: If any of these wires are present, you cannot use this thermostat with your system. See next stage.

Set adjustment lever (CT30 only)

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

Your system setting suggestions

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

Align the 3 tabs on the cover with slots on the thermostat, then push gently until the cover snaps into place.
Restore electrical power at the heating/cooling system, or at the fuse/ circuit-breaker panel.

Operation

Temperature setting

Move lever to adjust desired indoor temperature.

System off (CT33 only)

Move lever to far left to turn off heating system.

Limited Warranty

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

If the product is defective,

return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Honeywell Return Goods, Dock 4 MN10-3860, 1885 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 Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.

Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL 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 HONEYWELL 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 Honeywell Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502. In Canada, write Retail Products ON15-02H, Honeywell Limited/ Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V4Z9.

Need Help?

For assistance with this product please visit www.honeywell.com/yourhome or call Honeywell Customer Care toll-free at 1-800-468-1502

Automation and Control Solutions

Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Scarborough, Ontario M1V 4Z9
www.honeywell.com/yourhome
® U.S. Registered Trademark.
69-1808EF Rev. 03-2005

You can download a PDF copy of the Honeywell CT30/CT33 Low Voltage Thermostat user manual here.