CM901 - User Guide
1 day Programmable
Room Thermostat
Honeywell Control Systems Ltd.
Arlington Business Park,
Bracknell
Berkshire
RG12 1EB
Technical Help Desk: 08457 678999
www.honeywelluk.com
42010943- 03 R11
© 2005 Honeywell International Inc.
Description
The  Honeywell  CM901  is  a  programmable  room  thermostat  designed  to 
control  your  heating  system  efciently,  providing  comfortable  temperatures 
when you are at home and energy savings when you are away. The following 
instructions explain how to program and use the CM901 to provide the most 
home comfort at the least cost.
Features
Ergonomic User Interface OK-button features an ‘ ’ making the CM901 very 
easy to use so you always stay in control.
Dynamic  Text  Display  provides  informative  ‘on-screen’  feedback  and 
operational assistance to the user.
Extra Large LCD (Liquid Crystal Display) Screen with Backlight provides 
added user friendliness and clearer viewing – even in the dark.
6 independent temperature levels lets you set any 6 temperatures you require 
(from 5 to 35°C) so you can enjoy economical comfort throughout the day.
 
Holiday button saves energy by letting you reduce the temperature for 1 to 99 
days while you are away from home, resuming normal operation on your return.
Automatic Summer/Winter Time Change will adjust the clock automatically 
for ‘Daylight Saving Time’.
Built-in Memory holds  the  user program  indenitely so  that it  is  never lost 
– even if you remove the batteries.
Outside  Temperature  Sensor  (optional  accessory)  can  be  tted  to  the 
CM901 to display the temperature outside your home.
Remote Temperature Sensor (optional accessory) can be tted to the CM901 
to control to the room temperature in another location, concealing the CM901.
Optimum Start option is an advanced feature which ensures that the optimum 
temperature conditions are achieved at the required times.