Economiser And Extraction - Lennox Baltic BCK 020 Installation, Operating And Maintenance

ECONOMISER AND EXTRACTION

Economiser
Free cooling can be provided through the use of fresh air
where appropriate rather than cooling excessive 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 below on figure 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 roofcurb will be installed
BALTIC PRINCIPLE SKETCH
(vertical flow)
1
ENERGY RECOVERY MODULE + EXHAUST ROOFCURB
PRINCIPLE SKETCH (vertical flow)
2
1
6
2
3
5
Fresh air 1 Supply fan
Return air 2 Economiser damper
Exhaust air 3 Exhaust damper or
Supply air Exhaust damper + exhaust fan
0-25% fresh air manual (Fig. 10)
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
MULTIDIRECTIONAL ROOFCURB
PRINCIPLE SKETCH
1
4
ENERGY RECOVERY MODULE + EXHAUST ROOFCURB
PRINCIPLE SKETCH (horizontal flow)
2
1
6
4 Multidirectional roofcurb
5 Heat recovery module
6 Exhaust Roofcurb
IOM / ROOFTOP BALTIC Series - 0704-E Page 47
Fig. 9
Fig. 10
2
3
5