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Honeywell CM921 Product Specification Sheet

Honeywell CM921
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CM921 CHRONOTHERM
3
EN0H 8557 UK07 R0 09/06
INSTALLER SET-UP
I
n
I
ns
t
a
ll
er se
t
-up we can:
Set-up specific applications parameters
Enable special features
Configure system timing master for the zoning system
To enter the installer set-up mode:
a) Move the slider switch to the OFF position.
b) Press and hold the INFO
i button and the two program
buttons ‘< >’ together.
c) The unit will display the first parameter of installer
parameter group category 1 (from n.1 to n.19).
d) Press the TEMP
or buttons to change the factory
setting. The display will flash indicating that a change has
been made.
e) Press the green OK button to confirm this change and the
display will stop flashing.
f) Press the
+ button to go to the next parameter.
g) Press the program button
> to go to category 2 in the
Installer mode (from n.1 to n.14).
h) To exit the installer mode, move the slider switch to the
AUTO or MAN positions.
Abbreviated Set-Up Description
e.g. Cl = Clock Format
Factory Setting or New Choice
Press TEMP or to change
e.g. 12 = AM/PM Format
24 = 24hr Format
Installer Set-up Number
(Press + or - to change)
e.g. 1 = Clock Format
Brief Description of the
Parameter Function.
Specific Applications Setting What do you need to change?
Cycle/
Hour
Minimum
ON time
(in minutes)
Note : All parameters listed below belong to category 2 – System
Parameters (see Installer Parameters Table)
Heating Gas Boilers
(<30KW)
6 1 No changes required
Oil Boiler 3 4 1. Set Minimum ON Time to 4 minutes.
2. Set Cycle/Hour to 3.
Thermal Actuator 12 1 Set Cycle/Hour to 12.
Zone valve 6 1 No changes required.
Air
conditioning
1. Configure the thermostat to allow switching between heating
and cooling modes (set parameter n.4:HC to 1)
2. Set the thermostat accordingly to the required mode of
operation (heating or cooling) by pressing the TEMP
or
buttons together for 5 seconds.
Modify the cooling program
as required.
Heat Pump/
Air conditioner
3 4 1. Set Minimum ON Time to 4 minutes.
2. Set Cycle/Hour to 3.
Fan coil 6 1 No changes required.

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Honeywell CM921 Specifications

General IconGeneral
TypeProgrammable Thermostat
DisplayLCD
Programming7-day programmable
Power Source2 x AA batteries
Temperature Range5°C to 35°C
MountingWall-mounted
Voltage230V
Frequency50 Hz
Accuracy±0.5°C
Control ModeHeating
BackupBattery backup

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