Honeywell CT87N The Round Non Programmable Thermostat Owner’s Manual

The Round Non
Programmable Thermostat CT87N/CT87K

  • CT87K (24 Vac heating systems)
  • CT87N (24 Vac heating and cooling systems)

Getting started

Check package contents:

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

This thermostat contains a Lithium battery which may contain Perchlorate material.
Perchlorate Material—special handling may apply, See www.dtsc.ca.gov/hazardouswaste/perchlorate

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

  1. CAUTION TURN OFF POWER to system at the furnace, or at the fuse/circuit breaker panel before you begin.
  2. Remove cover and thermostat, but leave wallplate with wires attached.

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

U.S. Registered Trademark. U.S. Patents 7,159,789;
7,159,790; 7,476,988 and other patents pending.
Copyright © 2019, Resideo Technologies, Inc.
All rights reserved.

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.
  • For CT87N: If your old thermostat has 7 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 CT87K: If your old thermostat has 4 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

Mount thermostat base

Connect wires

Labels don’t match?

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

* For heat pump systems, add a jumper wire from the Y to the W terminals.
There should not be a wire from the wall to the W terminal.

Electrical Ratings

  • Voltage (50/60 Hz): 20 – 30 VAC
  • Running current: 0.02 – 1.0 A

Wiring CT87K

  • 2-wire heat-only system: Connect one wire to R terminal, one wire to W terminal.
  • 3-wire hot water heat-only system: Connect wires R to R, W to W, and Y to Y terminals.
    Alternate wiring: 5 to R, 4 to W, and 6 to Y terminals.

Set fan operation switch (CT87N)

Move the switch to the proper setting for your system:

F: For gas or oil heating systems, leave the fan operation switch in this factory-set position (for systems that control the fan in a call for heat).

E: Change the switch to this setting for heat pump or electric heat systems. (This setting is for systems that allow the thermostat to control the fan in a call for heat, if a fan wire is connected to the G terminal.)

Set cycle rate switches

Move the cycle rate switches to the proper setting for your system (see table below).

Finish installation

  1. Align the slots on the base with tabs on the thermostat, then push gently until the thermostat snaps into place.
  2. Restore electrical power at the heating/ cooling system, or at the fuse/circuitbreaker panel.

Operation

CAUTION: EQUIPMENT DAMAGE HAZARD (CT87N)
Do not operate cooling system when outdoor temperature is below 50°F (10°C).

1-year limited warranty

Resideo warrants this product 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.