12
FläktGroup
DC_9355GB 20180119_R0
We reserve the right to make changes without prior notice
Pressure balance over rotor
If the eQ unit is to be used in an application where it is
important to prevent air leaking from the extract air to the
supply air, ensure that the air leakage direction is correct.
Static pressure (greater negative pressure) must be lower in
the extract air than the supply air.
Any risk of leakage in the wrong direction is indicated in the
specifications for the eQ unit if there is a value for
extra restriction.
On the eQ PRIME, the correct leakage direction is ensured
by increasing the pressure drop by installing pressure
adjustment plates in front of the filter to further restrict
the extract air flow. The pressure adjustment plates are
perforated panels that can be spaced at various distances
depending on how much air restriction is needed. The
pressure adjustment plates are available as an accessory for
the eQ unit, and must be ordered separately.
Fitting of pressure adjustment plates
The pressure adjustment plates are supplied unfitted along
with the unit. Separate installation instructions are included
with the plates. The number of pressure adjustment plates
supplied depends on the size of the unit. Enough plates are
supplied to cover the whole duct opening. The number of
pressure adjustment plates required for the unit depends on
the degree of extra restriction needed. To fit the plates, bend
them and wedge them into the filter frame.
Adjusting the extra restriction
The extra restriction should be adjusted after the unit and
duct system are fully installed and ready for operation, so
that the pressure difference between the extract air and
supply air sides can be measured.
Connect a differential pressure meter to the unit's
measurement nipples. The nipples are intended for use with
differential pressure and/or flow meters (U-tube type) over
the fan and filter. If such meters are connected to the unit,
they must be disconnected while adjustment is taking place.
Metering must be done over the nipples on the side that is
downstream from the rotor in the supply air flow. Connect
one of the contacts on the pressure drop meter to the “+”
connection on the fan section and the “-” connection on the
filter section (see figure).
Please note that it is the difference in negative pressure that
is measured.
1. Start the unit on the chosen operating point.
2. Measure the pressure difference – if the negative
pressure is lower on the extract air side, increase
the extra restriction.
3. Stop the unit.
4. Install one or several pressure adjustment plates.
Repeat steps 1-4 until the pressure difference is in the
correct direction.
To prevent unnecessary pressure drop and energy loss,
ensure that the extra restriction is no higher than is
necessary in order for the pressure difference to stop at
20 Pa.
Pressure balancing, of units with connection to the top
above filter, must be done with a duct mounted damper with
manual level actuator. Same procedure as above can be
followed, where the damper is turned to more closed position
to create additional air restriction.
∆
P
<
20Pa
4
Summary of Contents for eQ PRIME 005
Page 1: ...eQ PRIME COMMISSIONING...
Page 2: ......
