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In normal operation the unit will not exhibit a significant level of vibration, however vibration
mitigation treatment may be necessary in certain situations. Where units are installed with
vibration limiting equipment, flexible connections should be applied to all other services
connected.
Installing Inlet Extension (Optional)
The units are available with a separate inlet extension that's fitted to the unit once installed.
Secure the extension onto the front of the unit, fixing it securely with the three fixings on either
side circled below and the drop rod fixings. Remove the filter from the unit and reposition it to
the front of the inlet extension.
Connecting Ductwork
Standard ductwork connections to units are circular or angular slip joints and must be
independently supported to not impose any load/weight on the unit spigot connections. The
installer is responsible for sealing the ductwork connections to the unit to ensure air tightness
requirements are met.
Flexible ductwork is sometimes used to connect the unit to the grille plenums. The amount of
flexible ductwork should be limited to the final 1m to allow for small alignment issues between
the solid ductwork and the plenum connection. Acoustic flexible ductwork should be used to
ensure final noise levels meet with levels specified for the project.
All ductwork is to be sized by the installer to suit the product performance. Overly small
ductwork can cause increased pressure drop, resulting in increased noise levels and fan wear.
Connecting the drain tray
During normal operation condensation may occur that will need to be moved away from
the unit. This is captured by the drain tray for collection and removal.
Standard connection to the drain tray is 15mm copper tube and this should be connected to a
suitable drainage system.
Condensate pumps can be fitted to the unit to provide an initial lift to a gravity drain system.
The pump contains an alarm function that can signal either pump failure, or that excessive
condensation is being produced. When the unit is purchased with Biddle's standard controls,
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