Theben RAM 751 Manual

Theben Termostat RAM 751

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1. Applications

The electronic floor temperature controller is used for

controlling electric:

• direct floor heating

• floor temperature conditioning systems

Features

• Nighttime set-back, input for external clock

• Indicator lamps for "controller calls for heat" and for

set-back operation

• 2-pole mains switch

• Mounting in 60mm flush-type box

2. Description of functions

2.1 Functions

The floor temperature is set via the dial and is measured

by the remote sensor.

The scale of *…5 corresponds to a temperature of

10…50 °C.

Lamps

Red: Controller calls for heat

Green: Set-back mode is activated

2.2 Functions of the set-back input TA

The TA input is used to set various set-back functions,

refer to table below.

The functions are selected via the mains sine half-waves.

The functions correspond to the "Pilot wire" specificati-

on.

Caution-1!

The device may only be opened and installed ac-

cording to the circuit diagram on the device or these

instructions by a qualified electrician. The existing

safety regulations must be observed.

In order to comply with safety class II, the necessary

installation steps must be taken.

This independently mountable electronic device is de-

signed for controlling the temperature in dry and en-

closed rooms only under normal conditions. The devi-

ce confirms to EN 60730, it works according operating

principle 1C

468 931 003 454



Mounting and

Operating Instructions

Electronic floor temperature controller

with set-back input

RAM 751

Half-wave Function

none no set-back

both set-back acc. to J2

positive control off

negative anti-freeze = 10 °C

both pulsed short set-back by 1°C

both pulsed long set-back by 2°C

The anti-freeze function regulates to a temperature of

10°C.

This multi-function input makes it possible to activate

controller functions by means of the various half-waves

of the mains AC voltage:

Normal operation: input open – – – –

Temp. set-back: both half-waves Ä

Anti-freeze: negative half-wave Å

Heating off: positive half-wave Ç

2.3 Selecting the set-back temperature

By means of the J2 jumper it is possible to select 3°

or 5°.

J2 closed set-back by 5°C (factory pre-set)

J2 open set-back by 3°C

The temperature set externally via the dial is reduced by

this value.

2.4 Fault of the floor sensor

If a sensor fault (short-circuit or break) occurs, the con-

troller will switch to fault mode. The heating will func-

tion with max. 30 % of the energy (operation for 30 % of

the time). This provides frost- and overheat protection.

In the event of a sensor fault, both lamps will flash.

2.5 Function of the lamps

Function Lamp green Lamp red

Heating is on on

Set-back mode on

Floor sensor fault flashes flashes

3. Electrical connection

Perform the steps described below:

• Pull off the temperature dial

• Release the fixing screw

• Remove the upper part of the casing

• Connect acc. to circuit diagram (see bottom of casing)

Floor sensor F 193 720

The remote sensor must be mounted in such a way that

the temperature to be limited can be correctly re-

corded.

The remote sensor should be installed in a protective

tube. This will facilitate future replacement.

Do not install the sensor close to power lines. In other

cases a shilded cable has to be used.

The sensor can be extended to max. 50 m by means of

a cable suitable for mains voltage.

Caution!

The sensor lines are on mains voltage (230 V).

Caution! De-energize the electric circuit first

4. Technical data

Order designation RAM 751

EDP No.: 751 0 131

Temperature setting range:

Floor temperature *…5 (= 10…50ºC)

Indicator lamp red Controller calls for heat

green Set-back temperature

Power switch 2-pole

Supply voltage 230 V AC (195…253 V) 50 Hz

Output Relay make contact

Switching current 100 mA…16 A cos = 1;ϕ

100 mA… 4 A cosϕ= 0.6

Control algorithm Proportional controller

(similar to continuous

through PWM)

Switching temperature

differential ~1°C

Temperature sensor Type F 193 720 (length 4 m,

can be extended to max.50 m)

Temperature set-back 3 K or 5 K selectable s. 2.3

vie external timer

Range limitation in the dial

Degree of protection

of casing IP 30

Safety class II (see Caution-1)

Degree of pollution 2

Software class A

Calculation impulse voltage 2,5 kV

Temperature for the

Ball compression test 75°C

Voltage and Current for

the for purposes of inter-

fernce measurements 230V, 0.1 A

Ambient temperature 0…40 ºC

Storage temperature –25…70ºC

Weight 90 g

Characteristics for remote sensor

10°C 66.8 k 30°C 26.3 kΩ Ω

20°C 41.3 k 40°C 17.0 kΩ Ω

25°C 33 k 50°C 11.3 kΩ Ω

5. Circuit diagram

Position of the jumpers

6. Dimensions

Theben AG · Hohenbergstr. 32

72401 Haigerloch · DEUTSCHLAND

Fon +49 (0) 74 74/6 92- 0

Fax +49 (0) 74 74/6 92- 150

Service

Fon +49 (0) 74 74 / 6 92 -369

Fax +49 (0) 74 74 / 6 92- 207

hotline@theben.de

Adresses, telephone numbers etc.

at www.theben.de

cover 2 parts (50x50)

for conduit boxes

according to DIN 49073

Produkt Specifikationer

Mærke:	Theben
Kategori:	Termostat
Model:	RAM 751

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