Honeywell CM921 Product Specification Sheet

CM921 CHRONOTHERM
5
EN0H 8557 UK07 R0 09/06
DIMENSIONS
Parameter Installer Set-
Up Number /
Abbreviation
(Press + or -
keys to
select)
Factory Setting Optional Setting
Category 2 Parameters – System Settings (press the > button to access this category)
Display Description Display Description
Minimum boiler ON
Time
1:Ot 1 1 minute minimum ON time 2 to 5
Selection of 2,3,4 or 5 minutes minimum
ON time
Cycle Rate 2:Cr 6 6 cycles per hour (cph) 3, 9 or12
Selection of 3,9 or 12 cph
Heat / Cool Change 4:HC 0 Disabled 1 Enabled
Pump Exercise 5:PE 0 Pump Exercise Disabled 1 Pump Exercise Enabled
System
Synchronisation
6:Sn 0 Standard operation of the
Room Unit
1 Room unit configured as Synchroniser
Loss of Communication
Instruction
7:LC 0 Relay Off 1 Relay 20% on / 80% off
The following parameters are for the control of other Honeywell Wireless products such as Wireless Underfloor Heating controls and
Wireless Radiator controls. For more information please contact Honeywell sales.
Room Temperature
Sensor Use
8:Su 0 HC60 Control 1,2,3 or 4
1 - HR80/HM80 control with own/remote
sensor (no temperature displayed)
2 - Hr80/HM80/HCE80 control with CM
Sensor
3 - HC60 control and HR80/HM80/
HCE80 control with own/remote sensor
4 – Hr80/HM80/HCE80 control with own/
remote sensor (temperature displayed)
HR80 Window-Open
Function
9:HO 0 Disabled 1 Enabled
HR80 Local Override 10:HL 1 Enabled 0 Disabled
Maximum Flow
Setpoint
11:uF 55 55°C Maximum Flow Temp. 0 to 99 0°C to 99°C adjustments in 1°C steps
Minimum Flow Setpoint 12:LF 15 15°C Minimum Flow Temp. 0 to 50 0°C to 50°C adjustments in 1°C steps
Mixing Value Run Time 13:Ar 150 150 seconds 0 to 240 0 to 240 sec. adjustments in 1sec steps

Honeywell CM921 Specifications

General

Type	Programmable Thermostat
Display	LCD
Programming	7-day programmable
Power Source	2 x AA batteries
Temperature Range	5°C to 35°C
Mounting	Wall-mounted
Voltage	230V
Frequency	50 Hz
Accuracy	±0.5°C
Control Mode	Heating
Backup	Battery backup