CM921
CHRONOTHERM
2
EN0H 8557 UK07 R0 09/06
SPECIFICATIONS
CONTROLS/DISPLAY LAYOUT
ELECTRICAL
Room unit power
supply
:
2 x 1.5 V IEC LR6 (AA) Alkaline cells
Battery life
:
Minimum 2 years
Battery
replacement
:
Program retained in EEPROM
Receiver power
supply
:
230V AC +10% - 15%, 50Hz
Switch type
:
SPDT potential free
Output rating
:
24-230 V AC, 10 A resistive, 3 A inductive
0.6 p.f.
Wiring (receiver
only)
:
Cable terminals for mains and relay wiring
for max 2.5 mm
2
wire
Wire access
:
from the rear (wall box mounting), right
and bottom
RF
RF operation band
:
ISM (868.0-868.6) MHz, 1% duty cycle
RF communication
range
:
30 m in a residential building environment
RF communication
technology
:
short, high rate transmissions to minimise
air time and avoid collisions
Blocking immunity
:
Receiver class 2 (ETSI EN300 220-1
version 1.3.1)
RF binding method
:
Factory pre-bound with the room unit.
ENVIRONMENTAL & STANDARDS
Operating
temperature
:
0 to 40
o
C when relay load < 8 A
:
0 to 30
o
C when relay load > 8 A
Shipping & storage
temperature
:
-20 to 55
o
C
Humidity
:
Humidity range 10 to 90% rh, non-
condensing
IP class
:
30
Meeting the
following
standards
:
EN60730-1(Nov 2000), EN55014-1(1997),
EN55014-2(2000), ETSI EN300 220-3
(2000), ETSI EN301 489-3(2000)
TEMPERATURE CONTROL
Sensing element
:
100K (@ 25
o
C ) NTC thermistor
Control form
:
Fuzzy Logic Algorithm
Minimum ON
time
10% of cycle time (min one minute),
adjustable to 2 to 5 min (see installer set
up)
Cycle rate
:
Selectable by application (see installer
set up)
Temperature
control accuracy
:
+
0.5 K (nominal) @ 20
o
C, 50% load 3K
Δ
/hour
Fail-safe mode
:
Off or cycling depending on the CM927
system set-up
TIME SETTING/PROGRAMMING
Time display
:
24 hour or 12 hour AM/PM format
Time keeping
accuracy
:
Typically better than 10 minutes per year
Program
:
1-day with 6 daily time and temperature
level changes
Time setting
resolution
:
Time of day - 1 minute
Program – 10 minute steps
Temperature
setting range
:
Program : 5 to 35
o
C in 0.5
o
C steps Frost
: 5
o
C or equal to lower limit (5
o
C to 16
o
C). Frost protection does not
work in cooling mode
Room
Temperature
display range
:
From 0
o
C to 50
o
C
Room Unit Layout:
1.
Day & Date Display
2. Time
Display
3.
Dynamic Text Display
(DTD)
4.
Burner On Indicator
5.
Battery Low Indicator
6. Temperature
Display
7. Temperature
Change
Buttons
8. Information
Enquiry
Button
9. Slider
Switch
10.
Green OK Button
11. Program
Buttons
12. Battery
Cover
13. Battery
Compartment
14. Holiday
Button
15.
Time Change Buttons
