Pressure Switch Setting; Electrical Power Connections - Grundfos FireSAFE Series Installation And Operating Instructions Manual

9.1 Pressure switch setting

The FireSAFE unit's pressure switch is set when leaving the factory, however the factory setting
may not be ideal for the site application, especially if a significant suction pressure pre-exists.
The factory setting can be adjusted as follows.
Figure 8 Pressure switch
Removing the pressure switch case exposes the user to electrical voltages

9.2 Electrical Power connections

The FireSAFE unit requires fitting with a suitable flame retardant power cable.
The power cable must be wired into a suitable lockable isolator switch to provide the power to
the system and to the Mains In terminals in the below PCB layout.
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Adjustment is made with a cross head screw driver.
Position 1 on the drawing adjusts the set point (OFF).
Course adjustment can be made against the scale on the
front of the device.
Position 2 on the drawing adjusts the differential (Start).
Course adjustment can be made against the scale on the
front of the device.
For fine adjustment, adjust against the scale on the
pressure gauge.
Access into the pressure switch is not required.
Do not remove the pressure switch case.
The secondary pressure switch is factory set at 1 Bar and
is provided as a back up to the Primary Pressure switch.
No adjustment should be necessary. However
adjustment can be made via the screw fitting in the rear
of the switch.
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