Default Values For The Pressure Switch - Wilo FLA Compact Notice De Montage Et De Mise En Service

• After setting the pressure switch, secure it against
unauthorised adjustment (e.g. sealing).
The pressure switch of type FF4 is designed as a
single-pole changeover contact. The switch con-
tact is wired at the factory to open when the pres-
sure drops and close when the set pressure is
reached (the pump runs with the switch contact
open).

8.1.1 Default values for the pressure switch

H(Q0) ... zero-delivery head of the system
H(geo)... geodesic head difference between
highest fire hose reels and FLA Compact
DS..A ... switch-off pressure of the relevant
pressure switch(..)
DS..E ... start-up pressure of the relevant
pressure switch(..)
Setpoint... specified operating pressure of
FLA Compact
NOTICE!
H(Q0) can be found in the enclosed test report
for the FLA Compact.
Pressure switch 1 (item 12a)
ON OFF
DS1E DS1A
Setpoint H(Q0) – 0.5 bar
Table 5
Example: H(Q0) = 75 m (~7.5 bar)
Setpoint = 6 bar
H(geo) = 20 m (~2.0 bar)
Pressure switch 1
DS1E DS1A
6.0 bar 7.0 bar
Installation and operating instructions Wilo-FLA Compact
ON
DS1E
Setpoint
Table 4
Example:
DS1E
6.0 bar
Pressure switch 2 (item 12b)
ON OFF
DS2E DS2A
DS1E DS1A
Pressure switch 2
DS2E DS2A
6.0 bar 7.0 bar
FLA Compact-1 (Fig. 2a):
Start-up pressure = setpoint
Switch-off pressure = H(Q0) – 0.5 bar
Pressure switch 1 (item 12)
OFF
DS1A
H(Q0) – 0.5 bar
H(Q0) = 75 m (~7.5 bar)
Setpoint = 6 bar
H(geo) = 20 m (~2.0 bar)
Pressure switch 1
DS1A
7.0 bar
FLA Compact-2 (Fig. 2b):
H(Q0) > DS1A ≥ DS2A > DS1E ≥ DS2E ≥ DS3A >
DS3E
NOTICE!
The default value for pressure switch 3 ON
depends on the system's hydraulic ambient varia-
bles; however, it should be within the limit values
"min" and "max" in Table 5.
Pressure switch 3 (item 12c)
ON
DS3E
min.: H(geo) + 0.5 bar
max.: Setpoint – 0.5 bar
Pressure switch 3
DS3E DS3A
2,5 ... 5,5 bar 6.0 bar
English
OFF
DS3A
DS2E
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