Ambic Equipment Ltd – AutoFoamer
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AF7500 (01.01.15)
AutoFoamer – LIQUID PRESSURE SETTING
During the initial installation and if it becomes necessary to replace the Pressure Switch, it may be
necessary to adjust the liquid pressure slightly.
The Pressure Switch in all units despatched after 1 January 2015 is controlled via a transformer at
12 VAC. This switch allows the liquid pressure level to be adjusted in the range 2-5 psi (0.2-0.3 Bar) by
means of a setscrew on the switch.
1.
Turn off the mains power at the switch and disconnect
the unit from the Mains Power supply.
2.
Unscrew the 4 screws and lift the lid of the small
enclosure (
A2
) to allow access to the inside of the
enclosure; the pressure switch is arrowed in the
photograph opposite.
3.
Use a 5/64” (2mm) Hexagon Key to turn the recessed
screw on the switch at the opposite end to the
electrical connections (see next photo below opposite).
4.
When viewed from above, turning the screw
CLOCKWISE will INCREASE PRESSURE;
ANTICLOCKWISE will DECREASE liquid Pressure.
(see diagram below).
5.
Each full turn of the adjusting screw increases/decreases the pressure by ~1 psi (~0.1 Bar).
It is recommended that NO MORE THAN 3 TURNS of the adjusting screw be made in either
direction. IF THE SCREW BECOMES LOOSE TO TURN, DO NOT TURN any further as you risk causing
permanent damage to the switch.
6.
Remove the Hexagon Key and close the lid before re-connecting the unit to Mains Power to check
if further adjustments are necessary.
