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1.34 CIRCULATION PUMP
The appliances are supplied with a variable speed circulator pump.
In the central heating mode, the following operating modes are available and can be selected from the "P.C.B. programming" menu (Par.
3.11).
The ∆T can be controlled compatibly with the characteristics of the central heating system and of the appliance.
- Proportional head (A3 = 0): the circulator speed varies according to the power emitted by the burner, the greater the power the great-
er the speed.
- ∆T Constant (A3 = 5 - 25 K): the pump speed varies to maintain the ∆T constant between the system flow and return according to set
value K (A3 = 15 Default).
- Fixed: by setting parameters "A1" and "A2" at the same value (7 - 9), the pump operates at constant speed. For the boiler to work prop-
erly, it is not allowed to drop below the minimum value indicated above.
The aforementioned heights allow for correct installation of the appliances and observe the technical regulations in force.
In domestic hot water mode, the circulator pump always runs at full speed.
Pump symbols (Fig. 48):
With the pump powered and the pwm control signal connected and operating (pump ON or in stand-by), the symbol 2 flashes green (
).
If the symbol 2 turns steady green (
If the pump detects an alarm, symbol 1 lights up red (
- Low power supply voltage.
- Rotor seized (Cautiously turn the screw in the centre of the head to manually release the motor shaft).
- Electrical error.
These anomalies will be signalled on the boiler display as errors "E60" or "E61".
66
), the pump detects no command on the pwm signal and always runs at maximum speed.
). This can mean that there is one of the following faults:
1
2
3
48
Key (Fig. 48):
1
- Alarm signal (Red)
2
- Functioning status signal (Steady green/Flashing green)
3
- Led (Not used on this model)
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