Flexit Nordic S3 - Troubleshooting Common Issues; Cold Draughts; Fans Not Working; Low Air Flow Rate

17
NORDIC S3
7. Installing and adjusting the
kitchen fan
7.1. INSTALLATION
If an external kitchen fan is going to be used,
documentation regarding installation and adjustment
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7.1.1. Kitchen fan without motor
(connected to unit with duct connection)
The air handling unit has a separate connection point
for kitchen fans without a motor. An electric cable (low-
voltage) must be connected between the unit and the
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switch on the hood.
7.1.2. Kitchen fan with motor
(not connected to unit)
The kitchen fan with motor is not connected to the
unit. It has a completely separate duct system for air
evacuation.
With the kitchen fan it is possible to compensate
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chap.7.2. Adjusting for more information.
7.2. ADJUSTING
If the kitchen fan is not supplied by Flexit, the fan
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hood, and arrange for supply air to the hood.
To reduce the risk of negative pressure in the home,
when using a kitchen fan with an air volume above
approx. 200m
3
/h is compensated for this with, for
example, an outdoor air valve in the wall.
7.2.1. Kitchen fan without motor
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To reduce the risk of forced ventilation through the
cooker hood causing imbalance between extract air
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attachment and the cooker hood can be measured with
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The method for adjusting the fan force will vary,
depending on which control unit is used (NordicPanel or
the Flexit GO app). In this description the Flexit GO app
is used.
Procedure:
1. Choose the cooker hood setting with the damper
open and the “cooker hood” signal activated. Adjust
the extract force in the “cooker hood” position until
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3
/h, to
obtain odour capture of approx. 75%.
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Adjust the fan force in the “cooker hood” setting for
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same for both fans.
7.2.2. Kitchen fan with motor
(not connected via duct to unit)
If a kitchen fan with a motor is used, the volume of air
extracted from the building increases. The air handling
unit can be adjusted to provide more supply air than
extract air to compensate for this.
A signal to the unit is required when the kitchen fan
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Connect an external switch with potential-free ON/OFF
signal to the 3-core cable on the unit (
DI2, see wiring
diagram
).
Install the pressure relay (accessory).
The cooker hood function works as follows:
The supply air fan will speed up, while the extract air fan
will continue at a low level to partly compensate for the
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Check the kitchen fan’s maximum capacity (based on the
capacity diagram on the kitchen fan).
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or more fresh air valves, for example.