Rehau REH CT3 User Manual

INSTRUCTIONS
© 2015 OJ Electronics A/S
1
Intelligent Room Controller/Sensor
English
Product programme
REH CT3 Wired room controller with clock
REH DT3 Wired room sensor with temperature adjustment, mode switch
(Auto, Day, Night, Frost Protection) and floor limit sensor
Mounting of room controller/sensor (figs 1 and 2)
The unit is used for comfort temperature control in rooms. The unit should
be mounted on an internal wall approx. 1.4-1.7 metres above the floor in
such a way as to allow free air circulation around it. Draughts and direct
sunlight or other heat sources must be avoided.
Fig. 1 Removing the front cover
BR 1026A02a
Fig. 2
BR1026A01a
REH CT3 / REH DT3: Wired room controllers/sensors – bus connection
(figs 3 and 4).
Only REHAU units which are suitable for two-wire communication can be used.
Standard installation cable of minimum 2 x 0.25 mm² can be used. Units can
be connected in conventional star formation or in bus mode (daisy chain). The
master has four sets of terminals marked SENSOR/CONTROLLER BUS that can be
used for connecting the 2-core signal cable from the unit.
67337 02/15 (HKT)
• English
Any unit can be connected to any pair of terminals. The total length of the 2-wire
system can be up to 300 m with a maximum length of 100 m between any two
units. For further information see the table below.
Remember to connect + to + and – to – .
Table: Length of cable
Standard cable Max cable length from
Master to Room Controller/
Sensor with display
Max cable length from
Master to Room Controller/
Sensor without display
≥0.25 mm² Up to 100 m * Up to 300 m
≥0.50 mm² Up to 200 m * Up to 300 m
≥0.75 mm² Up to 300 m * Up to 300 m
*) Up to 300m if operation without backlight is acceptable.
Fig. 3
BR935A03A
Fig. 4
BR935A03A

Rehau REH CT3 Specifications

General

Brand	Rehau
Model	REH CT3
Category	Controller
Language	English

Summary

Product Programme

REH CT3

Wired room controller with clock.

REH DT3

Wired room sensor with temp adjustment, mode switch, and floor limit sensor.

Mounting and Installation

Mounting of Room Controller/Sensor

Guidance on installing the unit on an internal wall at optimal height for free air circulation.

Bus Connection

Details on connecting REHAU units for two-wire communication using star or bus mode.

Setting Up Room Controller/Sensor Pairing

Instructions for setting up room controller/sensor output to control specific thermal actuators.

Mounting of Floor Limit Sensor

Information on installing the floor limit sensor and setting temperature limits via jumper.

Technical Specifications and Maintenance

Maintenance

The unit is maintenance free; keep air vents clean and unobstructed.

Certifications

Details CE marking and conformity with European Parliament directives.

Technical Specifications

Lists key technical data including purpose, cable type, temperature range, and dimensions.