Honeywell CM921 manual

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[...]

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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 ............................................ [...]

 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[...]

 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[...]

  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°[...]

  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[...]

  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[...]

  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[...]

  • 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.[...]

  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[...]

  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,[...]

 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[...]

  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[...]

 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:[...]

  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[...]

 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[...]

  ...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[...]

 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[...]