Manual Honeywell CM921 (page 4 of 18) (English)

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STEP 2: Setting the Date and Time

To set the Date and Time:

a. Move the slider switch to the DATE position. ‘SET THE DAY’ 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 ‘DAY OK?’ will be displayed. Once the correct day is reached, press

the green button to conﬁrm.

c. Now the month digits will start ﬂashing and ‘SET THE MONTH’ will be displayed.

Change the month and then the year using the or buttons, pressing the

green button to save any changes made. (If an invalid date has been entered

you will be returned to the start of the date setting mode).

d. After setting a valid date, the time digits will begin ﬂashing and ‘SET THE TIME’

will be displayed.

e. Use the or buttons to set the correct time. Each press of the button will

change the time by one minute and holding the button down will change the time

slowly at ﬁrst and get progressively quicker. Once the correct time is set, press

the green button to conﬁrm then ‘CHANGES SAVED’ will be displayed for a

moment followed by ‘DATE COMPLETE’.

Note: If the slider switch is moved at any time before ‘DATE COMPLETE’ is displayed

the changes to the date and time will NOT be saved.

STEP 3: Running the Built-in Heating Program

The thermostat is now ready for operation. Move the slider switch to the AUTO

position and the built-in heating program will start running. The built-in heating

program has been designed to provide normal comfort requirements, but if you want

to customise the default settings (as shown on the next page) please see the next

section ‘PROGRAMMING THE CM921’.

GETTING STARTED WITH THE CM921

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can a new CM921 Honeywell unit be fitted to existing receiver Submitted on 12-10-2021 at 14:30
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Honeywell CM921 Manual

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