Honeywell CM921 Benutzerhandbuch

CM921 CHRONOTHERM

 

 

2 
EN0H 8557 UK07 R0 09/06 

 
 
 

SPECIFICATIONS 

CONTROLS/DISPLAY LAYOUT

 

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 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.  

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) 

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 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