Immergas EOLO Mini - Page 30

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STEMkW Special ed 01/08 EOLO Mini kW Special
Technical DocumentationTechnical Documentation
Outputs.
Such (BUS) signal displays boiler temperature, DHW or central heating function mode
and the codes of any activated alarms on the remote control.
Digital remote control
(CRD) (option)
(see CRD function)
Such single-pole relay controls the pump (M1) and is actuated when pump operation is
required.
Pump relay
(K2)
Such bi-polar relay is enabled when the burner needs to be ignited. Boiler ignition is
enabled when it makes contact.
Request relay
(K1)
It is a continuous current signal which controls the modulation coil and allows for varying
of gas pressure at the burner depending on requested heat output.
Gas valve modulation coil
(Y2)
is signal signals to the zone control unit the current status of the appliance (DHW/
central heating) and, when installed it recognizes the CAR as room thermostat for no.1
zone (see Zone Control Unit function).
Zone control unit (CZ)
(option boiler externally
installed)
Such (BUS) signal displays boiler temperature, DHW or central heating function mode,
the codes of any activated alarms and the temperature reading of outdoor probe on the
remote control display.
Comando Amico Remoto
remote control (CAR) (op-
tion) (see CAR function)
e single-pole relay controls the fan (M20) and is actuated when fan operation is re-
quired.
Fan relay
(K3)
Such relay powers the motor (M) on electric 3-way valve (M30).
It is enabled after a central heating request and idles when there is a DHW request.
3-way valve relay
(K4)
It is a 230 V AC signal indicating the main coils on the gas valve
(Y1) are being powered.
Gas valve supply
(Y1)
230 V AC =
Powered coils
0 V AC = No
Powered coils
It is a high voltage signal (more than 16 kV) which triggers an electrical spark at either end
of the ignition electrodes on the burner.
Ignition electrodes
(E1)
Adjustments.
Gas type selector
Natural Gas/LPG
(S8)
Depending on its position (Natural gas/LPG), the selector adapts modulation param eters
to the type of gas ring the boiler.