2 If you install the product near a duct bend, do these
steps to prevent vibrations, unwanted noise and de-
creased air pressure:
a. Measure the distance (A) between the product and
the duct bend.
b. Make sure that the distance (A) is a minimum 2.5 x
the diameter (B) of the duct system. For a circular
ducts, (B) is the nominal diameter. For rectangular
ducts, (B) is the hydraulic diameter.
4.2.3 Pressure controller
The DVC-POC EC fan and DVCI-POC EC fan have a pres-
sure controller for constant pressure control and optional ex-
ternal temperature compensation.
The DVC-P fan and the DVCI-P fan have an integrated pres-
sure controller for constant pressure control.
The products that are delivered with a pressure controller are
also delivered with a separate instruction manual for the
pressure controller.
5 Electrical connection
5.1 To do before the electrical
connection
• Make sure that the electrical connection agrees with the
product specification on the motor name plate.
• Make sure that the environment for electrical connection
is clean and dry.
• Make sure that the wiring diagram that is included with the
supply of the product agrees with the terminals in the con-
nection box.
5.2 To connect the product to the
power supply
• Complete the electrical connection for the motor. Refer to
the motor wiring diagram that is included with the product.
• Make sure that the cross section of the protective earthing
is equal to or larger than the cross section of the phase
conductor.
• Install a circuit breaker in the permanent electrical installa-
tion, with a contact opening of a minimum 3 mm at each
pole.
• If a residual current device (RCD) is installed, make sure
that it is an all-current sensitive RCD. Consider if the prod-
uct has a frequency converter, uninterruptible power sup-
ply (UPS), or an EC motor. EC motors have a leakage
current to earth that is <=3.5 mA.
5.3 Speed controller for AC
motors
Note:
The speed controller alternatives are different for different
motor types. Make sure that your motor is compatible with
the speed controller type before you use it.
The speed can be controlled by voltage reduction using a
transformer. It is also possible to control the fan speed with
frequency converter if the installed frequency converter has
built in all-pole sine filter and shielded cables are not needed.
5.4 To install motor protection for
AC motors
• If the product has an built in motor protection, reset by dis-
connecting the product from power for 60 seconds.
• If the motor has temperature monitors such as thermal
contacts (TK) or thermistors lead out into the terminal box,
these must always be connected in the control circuit us-
ing appropriate motor protection.
• Make sure that an overheated motor cannot start again
automatically when it becomes cool.
• Install the motor cables and the temperature monitor apart.
• If the motor does not have temperature monitors, install a
motor protection switch.
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