Danfoss Wireless Regulation for Floor Heating
Data Sheet
Design Principle
Floor heating system
This section outlines the fundamental design of the floor heating system.
Contents
- Floor heating regulator, types CFM and CFS (page 3)
- Room thermostat, type CFR (page 4)
- Zone regulator, type CFZ (optional) (page 7)
Floor Heating Regulator, Type CFM/CFS
Application
The CFM is a regulator designed for room temperature control in homes utilizing floor heating systems supplied by a manifold with a temperature actuator, type ABN-NC. The regulator features 8 actuator outputs. It supports the integration of one or two slave regulators, CFS, each providing 8 outputs, to expand the system's capacity to a total of 24 outputs. Units connect to a standard wall output of 230 V a.c./50 Hz without requiring a transformer. Room temperature and desired temperature are transmitted wirelessly to the floor heating regulator, simplifying installation as all room thermostats are wireless. The system's modular design allows for its use with or without a zone regulator. Bus connections are provided ready for use with a standard connector.
Functions
- Frost protection is maintained at a minimum of 6°C.
- The pump output is activated for 5 minutes if it has been inactive for 24 hours.
- Actuator outputs are activated for 5 minutes if they have been inactive for 24 hours.
- The pump output can also serve to signal heat requirements for other automatic controls, such as oil burners, solar heat installations, or weather compensators.
- Relay outputs function as potential-free terminal switches.
- An optional integral acoustic fault alarm is available.
- The alarm output can be used for external alarm transmitters, such as a signal lamp.
- An external antenna is recommended if the regulator is installed within a metal casing.
Orders
| Product | Type | Supply voltage | Regulation voltage | Actuator type/nos. | Order no. |
|---|---|---|---|---|---|
| Master regulator | CFM-2301) | 230 V a.c. | 230 V a.c. | NC/8 | 088H0001 |
| Master regulator | CFM-241) | 230 V a.c. | 24 V d.c. | NC/8 | 088H0041 |
| Slave regulator | CFS-2302) | 230 V a.c. | 230 V a.c. | NC/8 | 088H0002 |
| Slave regulator | CFS-242) | 230 V a.c. | 24 V d.c. | NC/8 | 088H0042 |
1) Incl. installation cable 088H0092
2) Incl. bus cable 088H0051.
Options
| Options | Order no. | Related Parts |
|---|---|---|
| External antenna | 088H0093 | Fine fuses CFM/CFS 230 (F4A) |
| Bus cable* 1 m | 088H0051 | Fine fuses CFM/CFS 24 (T1.25A and T0.5A) |
| Bus cable* 5 m | 088H0055 | Bus cable (5x3.1mm 24 awg.) |
| Installation cable | 088H0092 | Connector (4p4c pds) |
* Bus cables are used for connecting master, slave, and zone regulators. These parts are available from electricity product wholesalers.
Floor Heating Regulator, Type CFM/CFS - Data, Wiring, Dimensions
Data
| Specification | Value |
|---|---|
| Supply voltage | 207-253 V a.c. |
| No. of outputs to actuators | 8 |
| Output signal | 230 V a.c. or 24 V d.c. |
| Max. power per output (230 V a.c. vers.) | CFM: 6 W, CFS: 6 W (2 ABN) |
| Max. power per output (24 V d.c. vers.) | CFM: 6 W, CFS: 3 W (1 ABN) |
| Pump relay output | Max. contact load 230 V a.c. (2A) |
| Alarm output | Max. contact load 230 V a.c. (2A) |
| Bus connection to slave module | RS 485, Max. total length 100 m |
| Radio and TV interference dampening | I-ETS 300 200 (1993) |
| Ambient temperature | 0-50°C |
| Transport temperature | -20°-60°C |
| Enclosure | IP 40 |
| Mains cable | 150 cm |
| Weight | 24 V d.c.: 1.2 kg, 230 V a.c.: 0.9 kg |
Wiring
The wiring diagram illustrates the connections for the CFM master regulator and CFS slave regulators. It shows the RS485 bus communication lines, power connections (P, N, +), and the output terminals (1-8 for CFM, 9-16 for CFS 1, 17-24 for CFS 2) for actuators.
Dimensions
A technical drawing provides the physical dimensions of the regulator unit, indicating its size and the placement of mounting points and connection terminals.
Room Thermostat, Type CFR
Application
The Room Thermostat CFR is utilized for room temperature regulation in conjunction with the floor heating regulator CFM. The CFR maintains a constant temperature by transmitting the required and current room temperature to the floor heating regulator, which then adjusts the water flow to the floor heating hoses accordingly. Key functions include a switch for selecting between constant comfort temperature, constant energy-saving temperature, or a clock function integrated with time programming via the zone regulator CFZ.
Ordering
| Product | Type | Description | Temperature range | Order no. |
|---|---|---|---|---|
| Room thermostat | CFR | Suppl. incl. batteries | 5-35°C | 088H0203 |
| Accessory | 2x AA Alkaline batteries 1.5 V |
Data
| Specification | Value |
|---|---|
| Supply voltage | Batteries, 2x AA Alkaline 1.5V |
| Battery life | approx. 5 years |
| Transmission frequency | 433.92 MHz |
| Transmission power | <10 mW |
| Range | approx. 30 metres |
| Temperature setting range | 5-35°C |
| Bus connection for installation | RS 232 |
| Radio and TV interference dampening | I-ETS 300 200 (1993) |
| Ambient temperature | 0-50°C |
| Transport temperature | -20°-60°C |
| Enclosure | IP 21 |
| Weight | 130 g |
Temperature setting
The temperature setting range for the room thermostat is 5-35°C. This range can be adjusted with minimum and maximum values using two lock-rings located on the setting button. The thermostat transmits temperature updates when the room temperature deviates by more than 0.15 K from the setpoint, or at least every 10 minutes.
Dimensions
A technical drawing shows the dimensions of the thermostat, highlighting the circular temperature setting dial and the display area.
Room Thermostat, Type CFR - Installation and Withdrawal
Installation and withdrawal
To install a room thermostat, connect it to the installation cable for the floor heating regulator. During the registration process, the first available LED will illuminate. Pressing 'OK' registers the thermostat. If registration under a different output is required, use the '+/-' keys to navigate to the desired output and press 'OK'. Withdrawal of a room thermostat is performed by pressing 'OK' for 5 seconds, which illuminates all LEDs. Then, use the '+/-' keys to locate the thermostat to be withdrawn and press 'OK' for 5 seconds to complete the process. The installation cable is not required for withdrawal. Each room thermostat possesses a unique ID number to prevent conflicts with other systems. A single room thermostat can manage multiple heating circuits if registered under several outputs in the master regulator.
Zone Regulator, Type CFZ
Application
The zone regulator is used for time and zone control of the floor heating system and can be retrofitted. It allows setting key heat control parameters such as comfort temperature, night setback, holiday settings, frost protection, and clock/display language. Factory settings include a holiday temperature of 15°C, night setback of 5°C, and frost temperature of 6°C, with specific heating periods defined for zone 1. Zones 2-6 are not in use, and English is the selected display language. The zone regulator enables the division of a dwelling into up to 6 heating zones, grouping areas with similar heating requirements and consumption patterns.
Ordering
| Product | Type | Description | Order no. |
|---|---|---|---|
| Zone regulator | CFZ | Incl. 5 m bus cable w/connector | 088H0004 |
Data
| Specification | Value |
|---|---|
| Power supply | From floor heating regulator |
| Program backup (power failure) | Yes |
| Max. length of bus cable | 100 m |
| Bus connection | RS 485 |
| Ambient temperature | 0-50°C |
| Transport temperature | -20°-60°C |
| Enclosure | IP 40 |
| Weight | 230 g |
Dimensions
A technical drawing illustrates the dimensions of the zone regulator unit, showing its physical size and layout.
Zoning
Zoning
Each room is equipped with a room thermostat to regulate temperature. These thermostats can be grouped into heating zones, defined as one or more rooms sharing similar heating consumption patterns. A dwelling can be divided into a maximum of 6 heating zones.
Example
The following table illustrates a division of a dwelling into 4 heating zones:
| Zone | Rooms | Heating periods |
|---|---|---|
| 1 | 1 | Monday-Friday: 3 p.m.-10 p.m. Saturday-Sunday: 8 a.m.-10 p.m. |
| 2 | 2,7,9,10,11 | Monday-Sunday: 4 p.m.-10 p.m. |
| 3 | 3,8 | Monday-Sunday: 7 a.m.-8 p.m. |
| 4 | 4,5,6 | Monday-Friday: 7:30 a.m.-9 a.m. and 3 p.m.-10 p.m. Saturday-Sunday: 9 a.m.-10 p.m. |
Diagram Description
A floor plan depicts a dwelling divided into four distinct heating zones. Each zone encompasses specific rooms, identified by numbers. Zone 1 includes room 1. Zone 2 covers rooms 2, 7, 9, 10, and 11. Zone 3 comprises rooms 3 and 8. Zone 4 includes rooms 4, 5, and 6. The diagram visually represents how different areas of the home are allocated to specific heating schedules.
