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Technical documentation
C.-heating potentiometer
(HEATING)
Central-heating timing
(J1)
D.h.w. potentiometer
(D-H-W.)
Gas selector (CM3)
Heating power trimmer
(HEATING POWER)
Pump switch
(CM2)
Soft ignition trimmer
(IGN. POWER.)
Circulator antilock
Delivery overheating
ventilation
NTC sensors faulty
(NR and NB)
Pump post-circulation
Sealed-chamber post-
ventilation
STESP ed 02/02
ADJUSTMENTS
Permits setting the temperature of the water for central-heating use between 38ºC
and 85 ºC.
At each switch-off due to temperature being reached during
central-heating, a delay is engaged of 3 min / 30 s until the next
re-ignition for the same type of request.
Permits setting the temperature of d.h.w. between 20 ºC and 60 ºC.
Depending on the position (natural gas/LPG), adapts the modulation parameters to
the gas for which the boiler is set.
Permits regulating the output during heating phase and adapting this to the needs of the
system (from min up to max regulated on the gas valve).
With the SUM/WINT switch in WINTER position, this enables
circulator operation in continuous mode or only at the request of
the room thermostat.
Permits regulating the power to the modulation coil and consequently the pressure
of the gas to the burner during the ignition phase (from min up to 2/3 of max
regulated on the valve).
By keeping the reset button (PU1) pressed during d.h.w. or central-heating, the
power to the coil is blocked at the slow ignition setting.
SAFETY DEVICES
The circulator (MP) is operated for 150 seconds after:
- 24 hours of inactivity with the SUM/WINT switch in SUMMER position
- 3 hours of inactivity with the SUM/WINT switch in WINTER position /radiator
antifreeze).
To prevent overheating the water/gas exchanger, if the temperature of the primary
circuit read by the NTC central-heating sensor (NR) exceeds 97°C, the fan is
started until the temperature drops below 93 ºC.
The breakage of the d.h.w. sensor (NB) prevents operation in d.h.w. phase.
The breakage of the heat. sensor (NR) prevents operation in central-heating or
d.h.w mode.
To avoid overheating the water/gas exchanger, the pump is kept operating for:
- 150 seconds after a central heating, chimneysweep and heating antifreeze request
- 60 seconds after a d.h.w. request (in this case the electric 3-way valve is
maintained in d.h.w. position)
After burner switch-off after any type of request, the combustion chamber is
washed and the fan kept operating for 30 seconds.
23
Technical documentation
absent = 30 s
present = 3 min
absent =
continuos operat.
present =
room thermo.
request operation
EOLO SUPERIOR PLUS
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