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1.35 UPM4 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.
The ∆T(A3) can be controlled compatibly with the characteristics of the central heating system and of the appliance.
- Proportional head (A4 = 0): the circulator speed varies according to the power emitted by the burner, the greater the power the great-
er the speed.
- ∆T Constant (A4 = 5 - 25 K): the pump speed varies to maintain the ∆T constant between the system flow and return according to set
value K (A4 = 15 Default).
- Fixed: by setting parameters "A2" and "A3" at the same value (6 - 9), the pump operates at constant speed. For the boiler to work proper-
ly, 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. 37):
The symbol 2 flashes green (
The symbol 2 stays on steady green (
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 (
- 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 "60" or "61".
52
) when the pump is powered and the pwm control signal is on (pump ON).
) when the pump is powered and the pwm control signal is off (pump in Stand-by). In this condi-
). This can mean that there is one of the following faults:
1
2
3
Key (Fig. 37):
1
- Alarm signal (Red)
2
- Functioning status signal (Steady green/Flashing green)
3
- Led (Not used on this model)
37
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