Danfoss CET B-RF User & Installation Instructions Manual

CET B-RF

Wireless Electronic Hot Water Cylinder Thermostat

User & Installation Instructions

®

Certification Mark

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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

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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

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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

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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

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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

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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

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8

Sensor wiring

Sensor Wiring

CS1

sensor

1 2 3

CET

Cable speci cation: minimum cross section 0.5mm

2

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