For a new installation, select a position about 5 feet (1.5 m) above the floor, where there is good air circulation. The thermostat must be installed on an inside wall. Avoid places where there are:
Remove the mounting plate from the thermostat.
NOTE: If you have a CT240 telephone controller, refer to section 5.1 for hook-up.
Before installing the thermostat on the wall, it must be configured using the dip switches at the back.
15- or 20-minute Cycles
The TH135 can operate on 15- or 20-minute cycles. While 15-minute cycles provide greater comfort, the heating system will be running more often.
You can choose between two temperature control modes:
This mode analyses previous cycles in order to define the length of the upcoming cycle. This mode guarantees optimal regulation of 3cycles (switch #1 to 20 min.) or 4 cycles (switch #1 to 15 min.) per hour, regardless of the season. Ideal for:
Conventional Mode with Anticipation
This mode turns the system On or Off when the temperature reaches preset levels. This model is compatible with all heating systems. It is recommended for a multi-zone system or when a thermostat directly controls a furnace equipped with a combustion gas purge cycle of more than 30 seconds. The temperature span (dead-band) is 0.5°C(0.9°F)
For hot water installations, it is recommended to activate the pump at least one minute every 24 hours in order to avoid seizures. Place switch #3 down to activate this function.
For all other installations, leave switch #3 in the Off position (otherwise your system will be activated 1 minute every 24 hours).
Temperature in °C or °F
The TH135 is factory-set to °C. If you wish to change the temperature display to °F, slide switch #4 upward. Please note that if you change from °C to °F or vice versa, you must reset the Comfort (
When you first install the batteries in the TH135, the unit runs a sequence of tests for approximately 5 seconds. After the tests, the screen should display the current temperature.
It is normal for the displayed temperature to be higher than the room temperature if you are holding the TH135 in your hands. It will return to normal about one hour after installation on the wall.
Mount the thermostat on the wall plate and screw it in place.
Preset Temperature | Default Setting |
Comfort temperature | 20 °C (68 °F) |
Economy temperature | 18 °C (64 °F) |
Vacation temperature | 10 °C (50 °F) |
1. To set the Comfort temperature, select the desired degree using the
2. To set the Economy temperature, select the desired degree using
3. To set the Vacation temperature, select the desired degree using
Telephone Controller
The TH135 incorporates a telephone controller interface that allows you to switch from the
Connection to the CT240
The TH135 is designed to connect directly to the CT240 telephone controller. This combination allows the activation and deactivation of the Vacation setting from the CT240 or telephone.
Connect the CT240’s terminals A and C to the TH135’s terminals X and C respectively. You must respect the polarity. For details on operating the telephone controller, refer to the CT240’s instruction manual.
Operating the Telephone Interface
You can activate the Vacation setting using the Vacation button of the telephone controller (
Connection to a Home Automation System
The Vacation setting can also be activated from a home automation system.
The TH135 will display an icon indicating that the batteries must be replaced. This icon will flash for 60days. After this period, the thermostat will shut down your heating unit.
After the battery replacement, you have to reprogram the
Even if the thermostat indicates the batteries are good, it is recommended to replace them once a year at the beginning of the heating season.
Resideo warrants this product, excluding battery, to be free from defects in workmanship or materials, under normal use and service, for a period of three (3) years 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, Resideoshallrepair or replace it (at Resideo’soption).
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 that 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. RESIDE 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 RESIDE 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 THREE-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 resides Customer Care, 1985 Douglas Dr, GoldenValley, MN 55422 or call1-800-468-1502.
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
33-00052—03 M.S. Rev. 05-20 | Printed in the United States
www.resideo.com
© 2020 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license from Honeywell International, Inc.
This product is manufactured by Resideo Technologies, Inc. and its affiliates.
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