Factory setting
Air flow can be regulated by a 3-phase fan speed regulator,
or by setting the selected fan speed as standard.
Examples of fan speed control
The contactors are not included in the delivery.
HEV-110 does not need any contactors.
Fan speed selection by central unit
The fan speed can be selected either by time control circuits
of the electric central unit or by DDC system. Connect the
contactors as shown in the figure! Please note that only one
contactor at a time can be switched.
Parallel coupling of HEV units
The fan speed can be selected by fan speed regulator NV,
by time control circuits of the electrical central unit or by DDC
system. The contactors are connected as shown. By NV fan
speed control 20 units can be controlled. Each unit needs 3
contactors.
Fan speed selection by a 3-phase thermostat
Thermostat contacts are shown at low temperature position.
At higher temperature first the left contact changes its posi-
tion, next the contact in the middle and last the right contact.
When the temperature is getting lower, the contacts change
their position in reverse order.
How to contact Alfa Laval
Up-to-date Alfa Laval contact details for
all countries are always available on our
website at www.alfalaval.com
ECF00348EN 1203
Alfa Laval reserves the right to change specification without prior notification.
Fan speed regulator NV
Connect fan speed regulator according
to instructions.
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Fan speed
Fan speed
Fan speed
Fan speed
Fan speed
control voltage
control voltage
Remove connection bar
Remove wire connect
Remove connection bar
Remove wire connect
Remove connection bar
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