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3.1. WILO PARA 25/8 SC PUMP
Wilo Para 25/8 SC circulation pump is a wet-running circulation pump permitting to
set speed control to Δp-v, Δp-c or n=constant. The operating status and possible faults
of the pump are displayed by means of LEDs directly on the pump display. It is used
exclusively for the circulation of liquids in hot water heating systems. Operating the
pump in other systems or in systems lacking water, containing air bubbles or not
pressurized can lead to its rapid destruction.
Wilo Para 25/8 SC Pump Data
Power supply
230 V, 50 Hz
Power input (min./max)
2 / 75 W
Current (min./max)
0.03 – 0.66 A
Max. speed
4800 rpm
Speed control
frequency converter
Energy Efficiency Index (EEI)
≤ 0.21 by EN 16297/3
IP rating
IPX4D
Motor protection
integrated
Min. pressure at the suction port to
avoid cavitation
0.5 mH
2
O at 55 °C
4.5 mH
2
O at 95 °C
Operating Parameters
Fluid working temperature
0 - 100°C at 58°C ambient temperature
Max. static pressure
10 bar
Max. head
8.4 m
Pump Wiring
1. POWER SUPPLY (1 ~ 230V, 50 Hz)
brown (L)
blue (N)
yellow-green (PE)
LED signals
State description and possible fault reasons
GREEN IS LIT
1 - pump is running in trouble-free operation
RED IS LIT
1 - rotor is blocked
2 - electric motor winding defect
FLASHING RED
1 - power supply lower/higher than 230 V
2 - electric short circuit in pump
3 - pump overheated
FLASHING RED AND GREEN
1 - unforced fluid circulation through the pump
2 - pump speed lower than desired
3 - air in pump
FAULT INDICATION
