Additional specifications and description
is the purpose of an HVAC potentiometer?
control signal (output potentiometer) increases or decreases according to the
position of the rotary knob. This control signal can directly control
EC fans or damper actuators. It can also remotely control
AC fan speed controllers (EVS or MVS series) or
frequency inverters (FI-E series). E.g.
the potentiometer can be installed in the living room while the fan speed
controller is located in a technical room or electrical
minimum and maximum level
For some applications, it is desirable
to adjust the low limit and the high limit of the
control signal. Some EC motors or damper actuators cannot handle
control signals that are too low. The low limit of the control signal can be
adjusted via a built-in trimmer. Sometimes, a fan
is overdimensioned. In that case, the high limit of the control signal
can be reduced via the maximum trimmer. This will limit the maximum
What are the limits of the control
This depends on the MTP-D supply voltage.
The supplied voltage must be in the range of 3 - 15 VDC. The
minimum value can then be set between 10 and 70 % of
the supplied voltage. The maximum value can be set
between 30 and 100 % of the supplied voltage. Always check that the
applied limits in combination with the supplied voltage result in an output
signal that complies with the specifications of the connected
if the supplied voltage is 15 VDC and the high limit is set to 100 %, the
connected device must be able to handle a control signal up to 15
some occasions, it is technically or legally required to ensure a minimum
air supply in all circumstances. Since this potentiometer does not have
an OFF position, the control signal will never reach 0 V. Even when
the rotary knob is at minimum position (turned counter
clockwise), the control signal will be at minimum value.
This low level can be adjusted via the built-in trimmer.
The dry contact output
can be used to control an external device. When the rotary
knob is at minimum position, the contact output is open. When the rotary
knob is turned clockwise, the contact will immediately close.