ECONOMISER AND EXTRACTION
FLEXYII_WSHP-IOM-0909-E Page 44
ECONOMISER
Free cooling can be provided through the use of fresh air which is more appropriate
than excessive cooling amounts of return air.
The economiser is factory fitted and tested prior to shipment.
It includes two dampers operating from a 24V actuator
RAIN HOOD
It also includes a factory fitted rain hood. Hoods is folded during transportation to limit
risks of damage and must be unfolded on site as shown on fig. 9
EXTRACTION
Installed with economiser assembly, the gravity exhaust dampers relieve the pressure
when outside air is introduced into the system.
When large amount of fresh air is introduced into the system power exhaust fans can be used to equalise the pressures.
The extraction fan runs when return air dampers are being closed and supply air blower is in operation. The extraction fan runs
when outdoor air dampers are at least 50% open (adjustable value). It is overload protected.
NOTE: When horizontal flow configuration is required, the multidirectional roof curb will be installed.
0-25% FRESH AIR MANUAL
It is enough to loosen the mobile grid's screws and to make it slip.
0%: screw into limit stop on the right
25%: screw into limit stop on the left
FRESH AIR
R
ETURN AIR
E
XHAUST AIR
SUPPLY AIR
Fig. 9
FLEXY II PRINCIPLE SKETCH
MULTIDIRECTIONAL ROOFCURB
PRINCIPLE SKETCH
ENERGY RECOVERY MODULE PRINCIPLE SKETCH RETURN ROOFCURB PRINCIPLE SKETCH
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