Velleman VMB1TSW User Manual download pdf (Page 21)

DIFFERENTIAL THERMOSTAT

Using two sensors, a differential thermostat can be created. When the temperature difference between both sensors

crosses a preset value, a relay channel can be activated.

To achieve this, the first sensors must know the address of the second one. The second sensor must than be linked

to a relay channel. The temperature difference value is set on the first sensor.

The settings can be done via a temperature controller VMB1TC / VMB1TCW(W) or via the Velbus link program.

Schematic overview differential thermostat (sensor2 in heating mode):

SENSOR1

SENSOR2

Set-up:

Differential sensor address =

address sensor2

heating

Temp. Difference ∆t = -10°...10°

heating on when t1+ ∆t > t2

Measured temp t1 + ∆t

= Desired temperature for sensor2

Remark:

if t1+ ∆t > t

mode2

than desired temp. sensor2 = t

mode2

(mode2 = anti-freeze, night, day or comfort)

Schematic overview differential thermostat (sensor2 in cooling mode):

SENSOR1

SENSOR2

Set-up:

Differential sensor address =

address sensor2

cooling

Temp. Difference ∆t = -10°...10°

Cooler on when t1+ ∆t < t2

Measured temp t1 + ∆t

= Desired temperature for sensor2

Remark: if t1+ ∆t < t

mode2

than desired temp. sensor2 =

mode2

(mode2 = anti-freeze, night, day or comfort)

Refer to some applications of a differential thermostat below.

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Velleman VMB1TSW User Manual Page 21