Honeywell CM901 User manual

HEATING CONTROLS
4.3
CM901
1 DAY PROGRAMMABLE THERMOSTAT
FEATURES
■
Slim, ultra modern design
■
Extra large LCD display with
user friendly Line of Text™
■
Automatic summer/winter time change
■
Continuous time, day & date displayed
■
Optional backlight
■
Auto, manual, override
and off modes
■
Optional optimum start
■
1 day programming
■
Battery powered
(with low-power indicator)
■
Up to six independent time &
temperature settings
■
Burner ‘ON’ symbol
■
Volt free connections
OPTIONS
■
Remote Sensor (wired)
■
Outside Temperature Sensor (wired)
APPLICATION
The CM901 is a 1 day Programmable Room Thermostat. It is
designed to provide automatic time and temperature control of
domestic heating or cooling systems in domestic or light
commercial premises.
The slim, ultra modern design complements the extra large
LCD screen with the Line of Text (LoT)™ display and one
function button to ensure simplified programming and operation
for all users.
The CM901 can be used to control the heating circuit in a
Sundial S or Y Plan and is particularly well suited to control
combination boiler installations or additional zones in a S Plan
Plus system.
The CM901 has been designed for applications where the
householder has different heating needs for the same times
each day.
Two wire, volt free connections are ideal for use with
combination boilers.
© Hone well Control Products and S stems, Issue 10
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1 DAY PROGRAMMABLE THERMOSTAT CM901
■Installation
The CM901 can either be surface or
flush switch box mounted. The wiring
sub-base has holes to suit single
switch boxes and provision for
surface wiring.
Do not position the CM901 or remote
temperature sensor near sources of
heat (direct sunlight, radiators, vents,
TV or lights), they must be located in
a position with good air circulation, at
average room temperature.
■Ordering Specification
CMT901A1044
1 day programmable thermostat
complete with batteries, fixing screws
and instructions
F42010971-001
Wired Outside Sensor to enable
outdoor temperature display only
F42010972-001
Wired Room Sensor to enable remote
temperature control
■Wiring
■Specification
Switch Rating : 230V~, 50Hz, 0.5A to 8A resistive
: 24V~, 50Hz, 0.5A to 8A resistive
Switch Type : Single pole, double throw (SPDT) relay
Power Supply : Two AA size, LR6, 1.5V alkaline batteries
Battery Life : Minimum 2 years (Program retained
indefinitely in EEPROM)
Wiring : Potential free terminals < 2.5mm2
Temperature Setting Range : 5 to 35˚C in 0.5˚C steps
Frost Protection Range : 5˚C (default) to 21˚C in 0.5˚C steps
Temperature Control Form : P+I (Proportional + Integral)
Temperature Sensing Element : 100K (@ 25˚C ) NTC thermistor
Temperature Control Accuracy : ± 0.5K at 20˚C (50% load, 3K/hour)
Time Setting Resolution : Time of day: 1 minute
: Programme time changes: 10 minutes
Time Display : 24 hr or 12 hr AM/PM format
Operating Temperature Range : 0 to 40˚C
Operating Humidity Range : 10 to 90% RH, non-condensing
Storage Conditions : –20 to 55˚C
European EN Approvals : EN60730-1 (Nov 2000), EN55014-1
(1997), EN55014-2 (2000)
■Dimensions (mm)
© Hone well Control Products and S stems, Issue 10, 4.3
0014_Section 4_dft10_v4.qxd:Section 2_dft9 15/10/07 16:19 Page 8