Danfoss CET B-RF Operating instructions

CET B-RF
Wireless Electronic Hot Water Cylinder Thermostat
User & Installation Instructions
®
Certification Mark
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]

2
Index
Installation 3-10
Product overview 3
Specication 4
Thermostat installation 5-7
Sensor wiring 8
Receiver installation 9
Receiver wiring 10
Schematics 11-14
Hard wired heating, 3-port 11
Wireless heating, 2 x 2-port 12
Hard wired heating, 2 x 2-port 13
Wireless heating, 3-port 14
Commissioning 15-17
User Instructions 18-21
What is a cylinder thermostat? 18-19
Setting the temperature 20
Display 20-21
Battery replacement 21
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]

3
Installation Instructions
Product overview
The CET B-RF is a battery powered cylinder thermostat
which measures cylinder temperature using a strap-on
temperature sensor. The sensor is tted to the cylinder
wall and wired to the thermostat, which is normally
located adjacent to the cylinder.
To avoid the need for wiring, the thermostat and boiler
or zone valve communicate to each other using secure
RF wireless communication. A receiver unit is mounted
next to the boiler or control valve and responds to
commands issued by the wireless thermostat.
Product overview
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]

4
Specication
Product specication (Thermostat)
Power supply :
2 x AA/LR6/MN1500 alkaline batteries
Transmitter frequency: 433.92MHz
Transmitter range: 30 metres line of sight
Temperature range: 40 - 65°C
Max. temp of thermostat: 45°C
Design standard:
EN60730-2-9 (EN300220 for RF)
Dimensions, mm: 85 wide x 86 high x 42 deep
Control pollution: Degree 2
Ball Hardness 75°C
Temperature accuracy ±1°C
RX receiver unit: see instructions packed with receiver
Specication
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]

5
1. The clamp on sensor should
be mounted onto the
cylinder wall at a height
equivalent to ½ the height
of the cylinder. Care should
be taken to remove any
insulation material from
the cylinder and to ensure
that the copper surface
of the cylinder is clean.
See diagram opposite for
details.
This product should only be installed by a qualied
electrician or competent heating installer and should be
in accordance with the current edition of the IEEE wiring
regulations.
1/2 cylinder
height
!
Thermostat installation
Installation - Thermostat
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]

6
2. Before attaching the sensor to the cylinder using the
strap provided, connect a 2-core cable to the sensor to
allow interconnection to the thermostat setting unit.
3. Apply the contact paste provided to the part of the
sensor in contact with the cylinder and clamp the sensor
to the cylinder wall.
A spacer piece is provided for use with cylinders that
have thick insulation (see opposite).
4. Mount the thermostat wallplate on to a wall next to the
cylinder. Connect the cable from the sensor to terminals
2 & 3 of the wallplate (see wiring diagram on page 8).
5. Now mount the thermostat setting unit onto the
wallplate and secure using the two screws on the
bottom of the wallplate.
Thermostat installation
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]

7
For insulation thicker than 25mm
and up to 55mm thick, use the
extra cover supplied as a spacer to
ensure that the sensor is held in
firm contact with the cylinder wall.
Using the spacer
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]

8
Sensor wiring
Sensor Wiring
CS1
sensor
1 2 3
CET
Cable specication: minimum cross section 0.5mm2
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]

9
Installation - RX Receiver unit
1. Mount the RX wallplate onto the wall - cable access
must be from behind or below the wallplate.
Typical wiring diagrams, showing the interconnection
between time controls and zone valves, are shown on
pages 11-14.
NOTE: Earth connections are for customer use only.
2. The RX receiver may now be mounted onto the wallplate
and secured using the two screws on the bottom of the
wallplate.
!Important note: Please ensure that when positioning
the thermostat setting unit that there are no large metal
obstructions, ie cylinder or boiler case, sitting in between the
thermostat and the RX receiver unit as these will block radio
communication and prevent the thermostat from operating
correctly.
Receiver installation
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]

10
Receiver Wiring (RF only)
ABC123456
ELECTRONICS
COM
ZONE 1
COM
ZONE 2
ZONE 1
ON
ZONE 1
OFF
ZONE 2
ON
ZONE 2
OFF
ZONE 1
ON
NL
1234
ELECTRONICS
NL
COM ZONE
1 ON
ZONE
1 OFF
RX1
RX2C
Receiver wiring
Note 1) For mains voltage operated systems link terminal 2 to mains live supply.
2) Power supply to unit must not be switched by timeswitch.
For latest prices and delivery to your door visit MyTub Ltd - 0845 303 8383 - www.mytub.co.uk - [email protected]