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INSTALLER
USERMAINTENANCE TECHNICIAN
TECHNICAL DATA
1.29 CIRCULATION PUMP
e 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.
e ∆T(A3) 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 ow 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.
In domestic hot water mode, the circulator pump always runs at full speed.
Pump symbols (Fig. 34):
e symbol 2 ashes green (
) when the pump is powered and the pwm control signal is on (pump ON).
e symbol 2 stays on steady green ( ) when the pump is powered and the pwm control signal is o (pump in Stand-by). In this condi-
tion is it necessary to distinguish between two cases:
- the appliance electronics are not requesting pump ignition => condition OK;
- the appliance electronics are requesting the pump to switch on => faulty condition (probable disconnection of the pwm signal).
If the pump detects an alarm, symbol 1 lights up red ( ). is can mean that there is one of the following faults:
- Low power supply voltage.
- Rotor seized (Cautiously turn the screw in the centre of the head to manually release the motor sha).
- Electrical error.
ese anomalies will be signalled on the boiler display as errors “E60” or “E61”.
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