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STEEkW ed 12/03 EOLO Eco kW
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STEEkW ed 12/03 EOLO Eco kW
Technical Documentation
Technical Documentation
Technical Documentation
Technical Documentation
Electrical circuit.
Central heating phase.
Operating with a room thermostat.
e central heating phase is enabled when the main selector
switch (R10) is on “WINTER”.
When the room thermostat contact is closed (S20), the inte-
grated board powers the boiler circulator (M1) by means of
relay K3 and, by deviating the contact of relay K1, powers the
motor (M) of the 3-way diverter valve (M30) that continues
working until limit switch “1” opens when the central heating
position is reached.
In the meantime, if the flue pressure switch (S6) contact is
idle, “NC”, the adjustment circuit powers the fan (M20) by
means of relay K4.
If the contact of the system pressure switch (S5) is closed
(the
pressure measured in the primary circuit is higher than the
mi-
nimum value)
, with the enable of the safety thermostat (E4)
and consequent switching over of the flue pressure switch to
“NO” (S6), the board provide to supply the coil of K2 request
relay.
If the temperature measured by the delivery NTC probe (B1) is
below the temperature set on the control panel with the central
heating temperature trimmer, the integrated board energizes the
K2 request relay which closes the 2 contacts allowing to start
of the ignition cycle, first controlling the ignition electrode (E1)
and then both the gas valve coils (Y1).
Burner ignition is detected by the integrated board by way of
the ionisation electrode (E2).
Operating with the remote control.
e remote control (CAR) is enabled when the main selector
switch (R10) is on “SUMMER and CAR”.
If the conditions found by the remote control (CAR) require
ignition in the central heating phase
(SUM/WIN selector of the
CAR on WINTER, central heating temperature setting higher
than what the heating probe (B1) detects, request for the hourly
programmer, room temperature setting higher than the temperature
measured)
, the integrated board powers the boiler circulator
(M1) by means of relay K3 and burner ignition occurs as
described above.
NOTE
: Each time the control unit switches off when the set
temperature is reached, the integrated board stops burner
operation in the central heating phase for the length of time set
with the board parameters
(see integrated board operation).
LOW
VOLTAGE
HIGH
VOLTAGE
RELAY BOARD
SUPPLY
RELAY BOARD
CONTROL
CONTROLS-LOGIC MICROPROCESSOR
ZONE CONTROL UNIT
central heating
d.h.w
.
