4.
Pressure-controlled regulation of
exodraft
supply air fan
4.1
Use
General
• The EBC20 can be used to control an
exodraft
BESB or BESF box fan.
• The EBC20 can control a supply air fan directly or indirectly via a frequency converter.
Positioning
Fit the EBC20 and pressure transducer (XTP) in the boiler room as described in section 1.3 Fitting, page 5 .
4.2
Method of operation
General function
• The control system monitors the pressure in the boiler room and disconnects the burner in the event of
errors (the alarmdiode on the EBC20 will turn on).
• When the pressure in the boiler room changes, the EBC20 will change the fan speed in order to meet the
setpoint pressure for the boiler room.
• The EBC20 is linked to the boiler system in such a way that when a heating requirement arises, the EBC20
will start the fan and delay the start of the boiler until the pressure in the boiler room is sufficient.
• A safety function ensures that if the pressure in the boiler room is insufficient, the EBC20 will shut down
the boilers.
4.3
Electrical connection
This work must be performed by a qualified electrical engineer, in accordance with locally applicable rules and
legislation.
The installation of the supply cable must be carried out in accordance with applicable regulations and
legislation.
The earth terminal (
) must always be connected.
When connecting pressure transducer (XTP) and frequency converter, screened cable must be used.
Isolation switch
exodraft a/s
stresses that in accordance with EU’s Machinery Directive an isolation switch must be set up in
the fixed installation.
The isolation switch is not supplied by
exodraft
. Available as an extra.
4.4
Sample wiring diagram
The following sample wiring diagram shows how to connect the EBC20 to a frequency converter/MPR relay.
exodraft
recommends that you contact the boiler manufacturer for details of correct connection of the boiler
control system.
3002878-EBC20-UK
Pressure-controlled regulation •
31
