User guide

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Chronotherms wireless
http://products.ecc.emea.honeywell.com/europe
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Chronotherms wireless
The CM920 (CM927 or CM921) is a modern wireless programmable room thermostat based on
Honeywell's proven CM60RFNG programming philosophy. To further improve the ease of use and
assist installation this product includes an extra large LCD display with backlighting, a dynamic text
display and an 'OK' button.
Used for general purpose control of boiler, zone values, circulation pumps, thermal actuators, electric
heaters, heat pumps, etc. in heating and cooling systems.
7-day program
1-day program
RF Chronotherm with extended feature set and slim ultra-modern design CM927,
CM921
Power source transmitter (room unit): battery powered, 2 x 1,5 V AA Alkaline
cells supplied; receiver (relay box): mains powered 230 V, 50 Hz
Battery life 2 years typical
Switch function/capacity SPDT, 24..230 Vac, 10 A resistive, 3 A inductive
Protection class IP30 (receiver and transmitter)
RF frequency range 868 ... 868,6 MHz
Blocking immunity Receiver class 2 (ETSI EN300220-1 version 1.3.1)
Terminal max. wire size 2,5 mm
2
Temp. setpoint range 0 ... 35
o
C
Control functions Fuzzy Logic Algorithm
Temperature setpoints
per day
6
Time setting resolution time of day 1 minute, program 10 minute steps
Heating /Cooling
application
H or C
Manual operation
functions
manual setpoint setting (MAN) and frost protection (OFF) modes
available
Holiday mode yes
Optimisation yes
Additional description • LCD backlighting
• automatic summer/winter time change
• user program stored in non-volatile memory
• factory pre-set RF link between the room unit and the relay box
• installer set-up mode
Default time display
format
Party timer Day off function User panel language Product literature
language
Type
24 h • • English NL, F CMT927A1015
24 h • • French F CMT927A1023
24 h • • Spanish E CMT927A1031
AM/PM••EnglishUK CMT927A1049
24 h • • Italian I CMT927A1056
24 h • • English D, HU, PO CMT927A1064
24 h • • English CZ, SK, PL CMT927A1072
Default time display
format
Party timer Day off function User panel language Product literature
language
Type
24 h – – English NL, F CMT921A1018
24 h – – French F CMT921A1026
AM/PM––EnglishUK CMT921A1042