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to control several electric heating panels) • Armchair programmed • Holiday button that provides energy savings by reducing to a constant temperature for 1 to 99 days when people are on holiday, returning to normal operation (AUTO or MANUAL) on the day of their return. • EEPROM memory holds the user program indefinitely • OFF position has an integral frost protection setting at minimum 5°C (installer adjustable) so that pipes in the house will never freeze in winter. • Communication compatibility with other Honeywell product such as HR80, HM80 and HCE80. PRODUCT SPECIFICATION SHEET The CM921 thermostat is designed to provide automatic time and temperature control of heating or cooling systems in villas and apartments. It can be used as part of a system in conjunction with combiboilers, oil-burners and gas fired boilers, circulation pumps, thermal actuators, zone values and electric heating systems (<10A). In combination with other CM921 room units and HC60NG receivers it can be used to control multi-zone applications (up to 4 zones). The radio frequency controlled CM921 system pack consists of a room unit CMT921A and a relay box R6660D (HC60NG). No wiring to the room unit is required. The installer only needs to wire the relay box to the controlled device (e.g. boiler) and mount the room unit in a suitable location where RF communication is reliable. The CM921 uses reliable RF communication technology in the 868MHz band. The CM921 extra large LCD display, dynamic text display and controls layout are identical to the CM901 ‘wired’ thermostat. The unit is ideal for consumers who want reliable and precise temperature control from a modern looking, simple to program and easy-to-use product. • CM921 can be used to control a zoning system with up to 4 zones • Maximum system efficiency and extended boiler life due to unique zoning system synchronisation • Automatic Summer / Winter time change adjusts the time automatically to daylight saving time. • Standard room units and receiver boxes are used for zoning applications algorithm • When used with the table top stand the room unit can be positioned anywhere in the room where RF communication is reliable • 24...230V 10A resistive, 3A inductive SPDT relay provides compatibility with most domestic central heating systems reducing the need to stock many different models. • The HC60NG may be surface or wallbox mounted. • Installer Set-Up Mode allows extra functions to be set at the discretion of the installer to match the consumer applications and needs: • Optimisation • Pump Exercise • Upper / Lower Setpoint Limit Adjust • Temperature offset • Minimum ON time • Cycle rate • Heat / Cool Operation • Proportional Band Width • Fail-safe mode for communication loss EN0H 8557 UK07 R0 09/06 CM921 CHRONOTHERM CONTROLS/DISPLAY LAYOUT 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 SPECIFICATIONS ELECTRICAL Room unit power : 2 x 1.5 V IEC LR6 (AA) Alkaline cells supply Battery life : Minimum 2 years Battery : Program retained in EEPROM replacement Receiver power : 230V AC +10% - 15%, 50Hz supply Switch type : SPDT potential free Output rating : 24-230 V AC, 10 A resistive, 3 A inductive 0.6 p.f. Wiring (receiver : Cable terminals for mains and relay wiring only) for max 2.5 mm2 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 : 30 m in a residential building environment range RF communication : short, high rate transmissions to minimise technology 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 : 0 to 40oC when relay load < 8 A temperature : 0 to 30oC when relay load > 8 A Shipping & storage : -20 to 55oC temperature Humidity : Humidity range 10 to 90% rh, non- condensing IP class : 30 Meeting the : EN60730-1(Nov 2000), EN55014-1(1997), following EN55014-2(2000), ETSI EN300 220-3 standards (2000), ETSI EN301 489-3(2000) TEMPERATURE CONTROL Sensing element : 100K (@ 25 oC ) NTC thermistor Control form : Fuzzy Logic Algorithm Minimum ON 10% of cycle time (min one minute), time adjustable to 2 to 5 min (see installer set up) Cycle rate : Selectable by application (see installer set up) Temperature : +0.5 K (nominal) @ 20oC, 50% load 3K control accuracy ./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 : Typically better than 10 minutes per year accuracy Program : 1-day with 6 daily time and temperature level changes Time settin...