Immergas HERCULES Condensing 26 2 E Manual page 48

Technical Documentation
Gas valve power supply
(Y1)
Comando Amico Remoto
remote control (CAR)
(optional) (see CAR functioning)
Igniter relay
(K7)
Boiler pump relay
(K2)
Three-way valve relay
(K4)
Gas valve relay
(K3)
Super CAR
(optional)
IMG BUS connection
(optional)
Fan
STHCkW ed 0409
Outputs.
It is a 24 V DC signal that indicates the power supply of the main coils of the gas valve.
It is a signal (BUS) that shows boiler temperature, functioning in DHW and Ch mode,
the alarm codes that have intervened and the temperature detected by any external probe
on the remote control display.
It is a unipolar relay that is excited when burner ignition is necessary. The electric spark takes
place at the ends of the ignition electrodes positioned on the burner, due to its contact.
It is a unipolar relay for boiler pump control (M1) that is excited when its functioning
is requested.
It is a relay that allows to power the motor (M) of the electric 3-way valve (M30). It is
excited with a central heating request and remains in stand-by with a domestic hot water
request.
It is a unipolar relay that allows to power the gas valve coils when the boiler must be
ignited.
It is a signal (BUS) that shows boiler temperature, functioning in DHW and Ch mode,
the alarm codes that have intervened and the temperature detected by any external probe
on the remote control display.
It allows the connection of electronic devices, e.g. Immergas zones digital control unit.
It is a positive square wave signal with variable ON-OFF relationship (duty-cycle) that
controls the fan.
Allows to vary the air flow rate to the Venturi pipe and therefore the gas pressure to the
burner.
46
Technical Documentation
HERCULES Condensing Export