Exodraft EBC22, Инструкция по эксплуатации

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3112015_EBC22_UK
This work must be performed by a qualified electrical engineer, in accordance with locally applicable
rules andlegislation.
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.
The installation of the supply cable must be carried out in accordance with applicable regulations and
legislation.
The earth terminal (
) must always be connected.
Exodraft recommends that you contact the boiler manufacturer for details of correct connection of the
boiler control system.
2-stage speed regulation of Exodraft chimney fan
Area of use
• The EBC22 can be used as a 2-stage speed regulator for an Exodraft chimney fan.
• The control system is intended for 1- or 2-stage atmospheric gas boilers.
• The EBC22 can control a chimney fan directly or indirectly via a frequency converter
Method of operation
General function
• The EBC22 monitors chimney draft and disconnects the boilers in the event of errors (the alarmdiode
on the EBC22 will turn on).
• When the boiler thermostat demands heat, the chimney fan will start at max. voltage.
• When the monitoring system measures sufficient chimney draft, the burner is released, and voltage to
the chimney fan is regulated according to the setpoint for stage 1 (LOW).
• When stage 2 (HIGH) is activated, the EBC22 regulates the voltage to the chimney fan according to the
set point for stage 2.
• It is possible to set pre-purge and post-purge periods for the chimney fan.
• In the event of insufficient draft, the burner will be disconnected after 15 seconds. “Insufficient draft” is
draft less than the value set on the PDS during commissioning.
Step-up function
• The step-up function in the EBC22 prevents unintentional disconnection of the system on account of
changes in wind and weather conditions.
• The step-up function performs a stepped increase of the voltage as a result of protracted draft errors.
In principle, this can be repeated until maximum voltage has been reached.
Electrical connection
Sample wiring diagrams
As a 2-stage speed regulator for Exodraft chimney fans, the EBC22 can be connected to a range of different
signals. The following sections contain two sample wiring diagrams showing:
3.4.1 1 x 2-stage boiler, page 32
3.4.2 2 x 1-stage boilers, page 33