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Manual Honeywell CM921

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Summary
  • Honeywell CM921 - page 1

    Honeywell Control Systems Ltd. Arlington Business Park, Bracknell Berkshire RG12 1EB T echnical Help Desk: 08457 678999 www .honeywelluk.com CM921 - User Guide 1 day Wireless Programmab le Room Thermostat with LoT technology 42011077-103 R1 © 2006 Honeywell International Inc. Description The Honeywell CM921 is a ‘wireless’ pr ogrammable room t ...

  • Honeywell CM921 - page 2

    the nation’s favourite for PL UMBING & HEA TING SUPPLIES SECURE P A YMENTS shop online with confidence FREE SHIPPING on all orders over £100 to mainland UK FINANCE A V AIL ABLE spread the cost with low interest rates PRICE MA TCH always get the best deals available Boilers R adiators Heating controls ? ...

  • Honeywell CM921 - page 3

    Contents GETTING ST ARTED WITH THE CM921 STEP 1: Installing the Batteries ......................................... 3 STEP 2: Setting the Date and Time ................................... 4 STEP 3: Running the Built-In Heating Program ................ 4 PROGRAMMING THE CM921 The Built-in Heating Program ............................................ ...

  • Honeywell CM921 - page 4

     This section shows you how to setup and run the thermostat in 3 simple steps: STEP 1: Installing the Batteries Note: Please follow the instructions in this section only if the thermostat screen is blank (no symbols or digits are displayed). If the screen displays some information move on to STEP 2: Setting the Date and Time. T o install the Bat ...

  • Honeywell CM921 - page 5

     STEP 2: Setting the Date and Time T o set the Date and Time: a. Move the slider switch to the D A TE position. ‘SET THE DA Y’ will be displayed on the screen and the day digits will be flashing. b. Use the or buttons to set the correct day . When either of these buttons are pressed ‘DA Y OK?’ will be displayed. Once the corr ect day is ...

  • Honeywell CM921 - page 6

      The Built-in Heating Program The built-in heating pr ogram has 6 temperature level changes that can be set between 3.00am and 2.50am - allowing you to maintain the evening temperature after midnight. Each temperature level can be set between 5°C and 35°C, and adjusted in 0.5° ...

  • Honeywell CM921 - page 7

      b. T o adjust the period start time press the or buttons and ‘TIME 1 OK?’ will be displayed. Holding the button down will change the time quickly . Note: If you ar e pressing the or buttons and the display flashes the next change period, it means the next change will be pus ...

  • Honeywell CM921 - page 8

      Disabling / Enabling Time Periods The thermostat has 6 periods that can be programmed, but you may not need all of these switch points for your heating requir ements. Therefore, any period from 2 to 6 can be disabled or enabled as follows: T o disable time periods: Go to the des ...

  • Honeywell CM921 - page 9

      Choosing the Operating Mode The thermostat can operate in three different modes: Automatic, Manual or Off. T o set the operating mode move the slider switch to the desired position. The screen indicates which mode is currently active by displaying A UTO , MAN or OFF . • A UT O (automat ...

  • Honeywell CM921 - page 10

      • T emperature Override During normal operation ( AUT O mode) the programmed temperature can be adjusted manually by pressing the or buttons. The ‘target‘ temperature will be displayed and flash for 5 seconds – during this time the or buttons can be used to modify the set value. ...

  • Honeywell CM921 - page 11

      Changing the User P arameters The user mode allows you to modify some basic settings of the ther mostat to meet your personal preferences. Y ou can change the time display format (24hr or AM/PM), reset the heating pr ogram to the built-in settings and disable or enable the summe ...

  • Honeywell CM921 - page 12

      c. Now choose which one of the following parameters you would like to change: i) Change the time format ‘CLOCK SELECT’ should be displayed on the screen - press the or buttons to select the preferred time format (12=AM/PM for mat, 24=24hr format) and the display will flash, ...

  • Honeywell CM921 - page 13

     Symptom P ossible Cause Remedy The thermostat has a blank LCD screen. Batteries not installed. Check to see if there are batteries in the battery compartment and the paper tab has been removed. Incorrect battery orientation. Check that the batteries have been installed in the correctorientation. Exhausted batteries. Replace with new batterie ...

  • Honeywell CM921 - page 14

      Symptom P ossible Cause Remedy The thermostat’ s LCD display works but the heating does not switch on (HC60NG LEDs are off or green one is on). No power to heating system. Check that there is power to the heating system. Program does not call for heat. Move the slider sw ...

  • Honeywell CM921 - page 15

     How do I change the batteries on the CM921 when they run out? The thermostat constantly monitors the battery power level, which typically last for about 2 years before needing replaced. When the power is running low a flashing symbol will be displayed on the screen. T o change the batteries follow the steps in the above section (‘ STEP 1: ...

  • Honeywell CM921 - page 16

      How do I remove the thermostat fr om the table stand or wall brac ket? After pr ogramming is finished always replace the thermostat back on the wall holder or table stand. HC60NG Relay Bo x Controls La yout What does it mean when the HC60NG relay bo x green LED is ON? Gre ...

  • Honeywell CM921 - page 17

     Can I use my CM921 to contr ol my air -conditioning system? Y es, if your system has been set up correctly you can use your thermostat to control the cooling. T o switch the ther mostat between heating and cooling modes press the or buttons together for 5 seconds in any of the product operating modes ( A UT O , MAN or OFF ). The text ‘COOL ...

  • Honeywell CM921 - page 18

      ...an explanation f or householders (The following explanation applies to heating applications only) A programmable room thermostat is both a programmer and a room thermostat. A programmer allows you to set ‘On’ and ‘Of ...

  • Honeywell CM921 - page 19

     42011077-103 R1  The time on the programmer must be correct. Some types have to be adjusted in spring and autumn at the changes between Greenwich Mean Time and British Summer Time. Y ou may be able to temporarily adjust the he ...

Manufacturer Honeywell Category Thermostat

Documents that we receive from a manufacturer of a Honeywell CM921 can be divided into several groups. They are, among others:
- Honeywell technical drawings
- CM921 manuals
- Honeywell product data sheets
- information booklets
- or energy labels Honeywell CM921
All of them are important, but the most important information from the point of view of use of the device are in the user manual Honeywell CM921.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Honeywell CM921, service manual, brief instructions and user manuals Honeywell CM921. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Honeywell CM921.

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A complete manual for the device Honeywell CM921, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Honeywell CM921 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Honeywell CM921.

A complete Honeywell manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Honeywell CM921 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Honeywell CM921, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Honeywell CM921, that we can find in the current document
3. Tips how to use the basic functions of the device Honeywell CM921 - which should help us in our first steps of using Honeywell CM921
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Honeywell CM921
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of Honeywell CM921 in a specific country, if it was not possible to solve the problem on our own.

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