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Velleman VM148 Module Manual

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Introduction:
Thank you for choosing Velleman. This multifunctional digital thermostat module allows you to control and monitor the room
temperature.
Modules needed:
Apart from the VM148 module, you will be needing a 12VDC power supply. Use an external contactor with currents higher than 3A.
Possibilities:
The module allows you to maintain the room temperature between 2 programmed limits. Example: The room temperature must
not drop below 20°C. Once the heating is activated, the room temperature must reach 22°C before being deactivated.
Control of the air conditioning system.
Temperature monitoring in e.g. a housing or greenhouse, of a liquid...).
General definitions:
Hysteresis: Temperature difference between temp° A and temp °B (min. 0.5°C). Temp°A will automatically rise with 0.5°C if
the two temperature settings have been programmed identically.
Heating mode: Activation of the heating when the measured temperature ≤ programmed
temperature B until the measured temperature > programmed temperature A. Heating mode is
activated when temp°A > temp°B.
Cooling mode: Activation of the air conditioning system when the measured temperature >
programmed temperature B until the ambient temperature drops below programmed tempera-
ture A. Cooling mode is activated when temp°A < temp°B.
A red dot is displayed in the right corner below when the relay, and consequently the
connected device, is activated.
Temperature display: The actual temperature and the settings can be displayed in ° Celsius
and ° Fahrenheit.
Heating
Temp. A > B
Off
on
Temp. A
Temp. B
Cooling
Temp. A< B
on
off
Temp. B
Temp. A
… 5 …


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