Immergas HERCULES Condensing 26 2 E Manual page 42

Technical Documentation
Electric circuit.
Fase riscaldamento.
Operating with room thermostat.
By pressing the main button (
bled.
By using button (A) to select functioning in
tioning is enabled in CH mode.
On closure of the room thermostat contact (S20) and if the
system pressure switch contact (S5) is closed (pressure detected
in the primary circuit higher than minimum value) the inte-
grated P.C.B. powers the pump (M1) by means of relay K2,
after which, by diversion of the K4 relay contact it powers the
motor (M) of the 3-way valve (M30). This functions until the
end run switch "1" opens when the CH position is reached.
This leads to the power supply of relay K1 positioned on the
pump relay board (A10) and the consequent power supply of
the CH pump (M2).
If the temperature detected by the NTC flow probe (B1) is
below the setting made on the control panel using the CH
temperature selector, the integrated P.C.B. powers the fan
(M20) and manages the speed.
With the consent of the safety thermostat (E4) and the flue
safety thermostat (E6) and the fan (M20) reaching the "validate
ignition" speed, the integrated P.C.B. allows to start the igni-
tion cycle by controlling, first the ignition electrodes (E1) by
means of the K7 igniter relay and then the K3 request relay,
both the coils of the gas valve (Y1).
The ignition of the burner is detected by the integrated P.C.B.
by means of the ionisation electrode (E2).
STHCkW ed 0409
CH ON
) boiler activation is ena-
(Winter) func-
40
Technical Documentation
SAFETY EXTRA LOW
VOLTAGE CIRCUIT
Operation with Remote Control.
In the case of connection to the CAR or Super CAR remote
control, the boiler automatically detects the device and the
( ) symbol appears on the display.
If the conditions detected by the Remote Control (CAR or
Super CAR) request ignition in CH mode (SUM/WINT selector
of the CAR in WINTER pos or Super CAR button working
(Winter), CH temperature adjustment higher than that detected
by the CH flow probe (B1), requested by the programmer clock,
room temperature adjustment higher than that detected)), the
integrated P.C.B. manages the burner ignition cycle as previ-
ously described.
N.B.: By pressing the main switch (
into Stand-by, the CAR will show the "CON" connection error
symbol and the "ERR>CM" error will appear on the Super
CAR. The remote control is kept powered without losing the
memorised programs.
N.B.: Every time switch off occurs when temperature is
reached, the integrated P.C.B. blocks burner functioning in
CH mode for a period of time equal to that set with board
parameters (see integrated P.C.B. functioning).
Super CAR remote
control (Optional)
SIGNAL
STATE
IMG BUS
link
RELAY BOARD (Optional)
Link for
VIRGILIO palmtop
Microprocessor
programming connector
Storage tank
function
jumper
) and taking the boiler
HERCULES Condensing Export