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Main electronic card
The electronic card is a Honeywell MF03: part of the card works on low
voltage (24V) and the remainder on 230V (see diagram) and it is fitted with
a fuse (2A). Part of the card is used to control ignition, so it is hooked up to
the detection and ignition electrodes and the safety thermostat. There are
loads and controls common to the card that have already been described,
such as:
•
Pump.
•
Fan.
•
Gas valve.
•
Air pressure switch.
There remain some components described hereunder.
Ignition + detection electrode, see chap. 2.4 Burner Unit
Safety thermostat
X6 - 5/6 has a thermostat with gold contacts that opens if the temperature
exceeds 100°C. Connected directly to the ignition and main card, when it
opens it cuts off the power supply to the valve directly, shutting down the
boiler. It is set on the left-hand side of the exchanger by a spring.
Limit thermostat
Connected on the main card X4 - 6/7, it is a thermostat with silver contacts
that opens if the temperature exceeds 88°C. It requires no manual resetting
and closes the contacts again if the temperature falls under 70°C. It is set on
the right-hand side of the exchanger by a spring.
28
Supplied By www.heating spares.co Tel. 0161 620 6677
DOMINA F 24 - 30 E
FERELLA F 24 - 30 MEL
MILOS AIR COMPACT E
Version - 09.2002
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