Alarko ALD 400 Series, Руководство по эксплуатации

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15
PRESSURE SWITCH
Table 2: Pressure Switch Features
Brand Italtecnica
Model PM/12
Place of Use ALD/ALDF
Pressure Limits 3-12 bar
Min. Differential Pressure 1,5 bar
Max. Differential Pressure 4 bar
Protection IP44
SETTING
PRESSURE SWITCH SETTING
The pressure switch has two spring bolts.
The long bolt adjusts the starting
pressure. The short bolt adjusts the stop
pressure.
1- Loosen the short bolt fully.
2- Adjust the switching pressure of the
pump using the long bolt.
3- Then tighten the short bolt until the
desired stop pressure is reached.
Stop pressure
adjusting bolt
Starting pressure
adjusting bolt
PRESSURE SWITCH ADJUSTMENT BY DEVICE TYPE ON ALD WATER
BOOSTERS
The pressure switch adjustment for water booster with single pump should be
made by the service at the place of use according to the table on the back page.
The pressure switches of the water boosters with twin and triple pump are adjusted
at the factory and shipped according to Table 3.
Water Booster with Single Pump:
The "Pressure Switch Setting" procedure on page 15 is applied.
Water Booster with Twin or Triple
Pump :
Note: In the water boosters with twin and triple pump, there is a delay of about 3
seconds for the motopump to detect the signal to prevent the pressure switch from
being affected by the water hammer pulse. This delay should be considered as
standard deviation
during adjustment.
The water booster must be operated in manual mode for adjustment.
CAUTION: In manual mode, the pressure switch is activated and stops and start
the motopump according to its output.