VES Andover Ltd Eagle Close Chandlers Ford Ind. Est Eastleigh Hampshire SO53 4NF
Tel: 08448 15 60 60 Fax: 02380 261204 E-mail: [email protected] Web: www.ves.co.uk
ecovent
NRG
Air Handling Units
Installation, Operation and Maintenance Manual
12
Continued
Prior to starting the unit it is important to ensure that the fans are free running, and should any
components have moved during transit take care to ensure they are realigned to allow correct
operation/rotation. The same should be applied to any wiring looms which may have become
unfastened; ensure that loose wiring is securely stowed away from any moving components.
Inverter-driven plug fans are supplied as a balanced assembly and should not be disassembled,
however the assembly is secured for transit with bolts as shown; these should be removed prior
to start-up.
Units size 0, 1 and 2 are supplied with a PS17 dual fan speed controller for commissioning; see the
accompanying speed controller documentation for further operational details.
Units size 7, 8 and 9 are supplied with fi tted 3phase inverters for fan speed control and
commissioning; see the accompanying inverter documentation for further operational details.
The centrifugal plug fans have infi nite adjustment and when controlled by inverter, the benefi ts of
real energy savings are apparent when the fan speed is reduced; this is best demonstrated when
used in conjunction with additional sensors such as air quality or occupancy.
Using a micro manometer and adjusting the fan speed via the inverter it is possible to commission
each fan to the required air volume. Each fan section has a differential pressure tapping connection
point; by connecting your micro manometer to the appropriate pitot a differential pressure reading
can be taken.
This commissioning technique is only applicable to unit sizes 7, 8 and 9 with inverter control.
Typical plug fan set-up showing necessary transit bolt removal
Important
Typical plug fan set-up
showing necessary transit
bolt removal
Fig.
Differential Pressure
Tapping point
Fig.
Standard Wiring
& Fan Installation
5
Remove
