Immergas HERCULES Condensing 26 2 E Manual page 47

Technical Documentation
External probe (B4)
(optional)
Flow probe
(B1)
Domestic hot water probe
(B2)
Return probe resistance
(R9)
Room thermostat
(S20)
(external optional)
Flue safety thermostat
(E6)
Safety thermostat
(E4)
Fan speed
STHCkW ed 04/09
It is a resistance that can be varied proportionally to the external
temperature.
It allows the integrated P.C.B. to vary the system flow temperature
depending on the external temperature.
It is a resistance that can be varied in an inversely proportional
manner to the temperature of the primary circuit flow water.
It is also used as a limit thermostat on the flow (90 °C).
It is a resistance that can be varied in an inversely proportional
manner to the temperature of the water contained in the storage
tank.
It is a resistance that simulates the presence of the system return
probe. It must always be present.
It is a clean contact switch that sends a signal (in low voltage) to
the board enabling functioning in the CH mode when the room
temperature is lower than that requested.
It is a contact which, on opening, allows the board to identify and
display any flue safety thermostat intervention (E6) with an "ERR
03" error code.
It is a contact which, on opening, allows the board to identify and
display any flue safety thermostat intervention (E4) with an "ERR
02" error code.
It is a square wave signal detected with a Hall effect sensor inserted into the fan. It allows
the integrated P.C.B. to measure the speed and correct it if it does not comply with the
requested value.
45
Technical Documentation
PTC probe
1 kΩ 25 °C
NTC probe
10 kΩ 25 °C
NTC probe
10 kΩ 25 °C
Factor
2,2 kΩ 1/4 W
Open = Central
heating OFF
Closed = Central
heating ON
Open = Function-
ing OFF
Closed = Func-
tioning ON
Open = Function-
ing OFF
Closed = Func-
tioning ON
HERCULES Condensing Export