Product Description
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.
Technical Properties
| Control functions |
Fuzzy Logic Algorithm |
| Heating /Cooling application |
H or C |
| Time setting resolution |
time of day 1 minute, program 10 minute steps |
| Holiday mode |
Yes |
| Optimisation |
Yes |
| Temperature setpoints per day |
6 |
| ErP Class |
IV |
| Manual operation functions |
manual setpoint setting (MAN) and frost protection (OFF) modes available |
| Temp. setpoint range |
0 ... 35 oC |
| Switch function/capacity |
SPDT, 24..230 Vac, 10 A resistive, 3 A inductive |
| RF frequency range |
868 ... 868,6 MHz |
| Blocking immunity |
Receiver class 2 (ETSI EN300220-1 version 1.3.1) |
| Protection class |
IP30 (receiver and transmitter) |
| Terminal max. wire size |
2,5 mm2 |
| Battery life |
2 years typical |
| 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 |
| Additional Descriptions |
- 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
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