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Manual Honeywell CM901 Thermostat

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Manual

EN0H 8546 UK07 R01/06

CM901

PROGRAMMABLE THERMOSTAT

PRODUCT SPECIFICATION SHEET

The CM901 thermostat is designed to provide automatic time

and temperature control of heating or cooling systems in

villas and apartments.

It can be used as part of a system in conjunction with combi-

boilers, oil-burners and gas fired boilers, circulation pumps,

thermal actuators, zone valves and electric heat systems

(<8A).

The CM901 is designed with the installer in mind and

includes a moulded back-plate with trunking guides and

wiring breakouts to make installation quick and easy.

The CM901 extra large LCD display, dynamic text display,

button layout based on the same simple programming

philosophy used on our acclaimed CM60 products and the

introduction of an ‘OK’ button makes it easier to install and

more user friendly.

The unit is ideal for consumers who want reliable precise

temperature control from a modern looking, simple to

program and eas to se prod ct

FEATURES

•

Attractive, slim, ultra-modern styling makes it ideal for

location in any type of home.

• 24 hour heating program.

• A dynamic text display on the LCD that gives enhanced

feedback to the user / installer.

• Up to 6 daily independent time and temperature level

changes let you set 6 time and temperatures pairs to suit

your lifestyle.

• LCD Backlighting to illuminate the display for easier viewing

in low light conditions.

• Temporary programmed temperature override to override

the programmed temperature till the next switch point.

• Holiday button that provides energy savings by reducing

to a constant temperature from 1 to 99 days when people are

on holiday, returning to normal operation (AUTO or

MANUAL) on the day of their return.

• Room Temperature Enquiry.

• EEPROM memory holds the user program indefinitely.

• OFF position has an integral frost protection setting at

minimum 5°C (installer adjustable) so that pipes in the

house will never freeze in winter.

• 24...230V 8A resistive, 3A inductive SPDT relay provides

compatibility with most domestic central heating systems

reducing the need to stock many different models.

• Battery powered by 2 x AA size (LR6) alkaline cells.

• Minimum battery life of 2 years with low battery warning

indicator.

• Built-in default heating program.

• Automatic Summer / Winter time change adjusts the time

automatically to daylight saving time.

• Telephone interface can be fitted to allow remote switching

between program modes and a fixed set-point.

• Surface or wall-box mounting options with trunking guides

and wiring breakouts to simplify installation.

• No installer links or special installer switches on the back of

the unit mean no adjustment is required for combi-boilers

and most domestic central heating systems.

• User Set-Up Mode allows extra functions to be set at the

discretion of the user:

• AM-PM or 24hr time display.

• Resetting the heating profile to factory default.

• Enable / disable of Auto Summer / Winter time change.

• Languages selection of the user interface (on selected

models only).

• Installer Set-Up Mode allows extra functions to be set at the

discretion of the installer to match the consumers

applications and needs:

• Optimisation.

• Pump Exercise.

• Upper / Lower Set point Limit Adjust.

• Temperature offset.

• Minimum ON time.

• Cycle rate.

• Heat / Cool Operation.

• Proportional Band Width.

• Diagnostic Mode to assist in faultfinding.

Download manual in English (PDF, 0.41 MB)

(Consider the environment and only print this manual if it is really necessary)

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Join the conversation about this product

Here you can share what you think about the Honeywell CM901 Thermostat. If you have a question, first carefully read the manual. Requesting a manual can be done by using our contact form.

Patrick bossard tel 0629 22-10-2019
I take the liberty of contacting you I have a room thermostat ref CM 901 I want to put it back into service with the boiler, I have indeed put new batteries but like last year we can see badly or not all the iodines indicating the day, the ambient temperature the device being defective? I ask you what I should do to fix this problem thanks in advance

reply | This was helpful (26) (Translated by Google)

bernard guilbert 10-12-2019
9 years of installation of this thermostat and the contacts no longer work. The installer (ENGIE) advises me to buy a special contact spray and spray on the thermostat ........ is this serious ??? Thank you for your participation

reply | This was helpful (14) (Translated by Google)

Hoff 20-06-2020
how do you put the thermostat back in French?

reply | This was helpful (4) (Translated by Google)

luciano del bianco 16-11-2020
Hello I replace my honiwel escom thermostat with the CM901 is it compatible with my bulex MASTERTWIN CONDENS (31) boiler and my 2nd question you are talking about batteries but know we connected it with the wires coming from the boiler, thanking you for advance.

reply | This was helpful (2) (Translated by Google)

lucien castiaux 30-12-2021
HOW TO PROGRAM THE THERMOSTAT impossible to read letter too small

reply | This was helpful (1) (Translated by Google)

John Slater 24-07-2022
The Gas burning indicator is not showing on my screen

reply | This was helpful (0)

Roger Walraedt 16-10-2023
Hello, the burner indication on a CM 900 appliance does not come through. How can this be reset? Thanks for your answer.

reply | This was helpful (0) (Translated by Google)

philippe uytt 24-10-2023
hello, a difference of 2° more for the CM901 thermostat and two thermometers located on each side of the thermostat. ?

reply | This was helpful (0) (Translated by Google)

More about this manual

We understand that it’s nice to have a paper manual for your Honeywell CM901 Thermostat. You can always download the manual from our website and print it yourself. If you would like to have an original manual, we recommend you contact Honeywell. They might be able to provide an original manual. Are you looking for the manual of your Honeywell CM901 Thermostat in a different language? Choose your preferred language on our homepage and search for the model number to see if we have it available.

Specifications

Brand	Honeywell
Model	CM901
Category	Thermostats
File type	PDF
File size	0.41 MB

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Frequently Asked Questions about Honeywell CM901 Thermostat

Our support team searches for useful product information and answers to frequently asked questions. If you find an inaccuracy in our frequently asked questions, please let us know by using our contact form.

What is the dead zone of a thermostat? Verified

Many modern thermostats have a dead zone. If the temperature deviates less than 4°C from the set temperature, the system will not heat or cool. This so called dead zone of the thermostat prevents the system from turning on and off too often, saving energy.

This was helpful (1755) Read more

What is the best place to mount a thermostat? Verified

The best place for a thermostat is approximately 1,5 meter above the ground. Never place the thermostat nead a radiator or other heat emitting equipment or in direct sunlight. Choose a room that is used often. In most cases this is the living room.

This was helpful (1125) Read more