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Special Features - Honeywell CM921 Product Specification Sheet

Wireless programmable thermostat
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Special Features

Optimisation
(Variable Start
Time)
Heating or Cooling
Operation
Summer/Winter
Auto time change
Temperature Offset
Upper/Lower
Temperature Limit
INSTALLER PARAMETER TABLES
Parameter
Installer Set-
Up Number /
Abbreviation
(Press + or -
keys to
select)
Category 1 Parameters – Room Thermostat Settings
AM-PM / 24hr Display
RESET Time /
Temperature Program
Automatic
Summer/Winter Time
Change
LCD Backlighting
Upper Temperature
Limit
Lower Temperature
Limit
Optimisation
Temperature Offset
Proportional Band
Width
Reset Parameters to
Factory Defaults
4
EN0H 8557 UK07 R0 09/06
Description
The thermostat will adjust the start time in the morning/afternoon
so the desired temperature is reached by the start of the program
period. The system will restrict the start time to a max of 2 hours.
This product can be used for heating or cooling applications. If
you select cooling mode the control algorithm and factory default
program will be modified. You can independently modify the
heating and cooling profile.
This feature moves time automatically on the last Sunday of
March and the last Sunday of October. The feature is factory
enabled.
If the thermostat is located in a particularly hot/cold location for
reliable signal transmission reasons then the measured/displayed
temperature can be adjusted by +/- 3°C. This is useful if the
homeowner wants the reading to match another appliance
temperature display.
The normal upper temperature limit of 35°C can be reduced to
21°C to save the homeowner energy. The normal lower limit of
5°C can be increased up to 21°C to protect inhabitants from cold.
Factory Setting
Display
Description
1:Cl
24
24 hr clock display
2:rP
1
Time / Temperature profile set
to factory default
Changes to 0 when one of the
time/temp profiles are changed
3:tC
1
Automatic Summer/Winter
Time Change Enabled
5:bL
1
Backlighting Enabled
6:uL
35
35°C Upper Temp. Limit
7:LL
5
5°C Lower Temp. Limit
8:0P
0
Optimisation disabled
12:tO
0
No offset
13:Pb
1.5
1.5°C Proportional Band
19:FS
1
All settings held are the factory
defaults.
Changes to 0 when one of the
parameter values are changed
CM921 CHRONOTHERM
Setting
To enable: Set parameter 8:OP
(category 1) to 1.
To enable: Set parameter 4:HC
(category 2) to 1.
To enable: Set parameter 3:tC
(category 1) to 1.
Set parameter 12:tO (category
1) to the required
offset value.
Set parameter 6:uL (category 1)
to the desired upper limit.
Set parameter 7:LL (category 1)
Optional Setting
Display
Description
12
12 hr AM / PM clock display
0
Time / Temperature are as programmed
1
To restore the factory profile set to 1
0
Automatic Summer/Winter Time Change
Disabled
0
Backlighting Disabled
21 to 34
21°C to 34°C adjustment in 1°C steps
6 to 21
6°C to 21°C adjustment in 1°C steps
1
Optimisation enabled
-3 to +3
-3°C to +3°C adjustment in 0.1°C steps
1.6 to 3.0
1.6°C to 3.0°C adjustment in 0.1°C steps
0
Settings are as modified above
1
To restore the factory profile set to 1

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