INSTALLATION
The PG20 is suitable for use in all cold-water based
applications such as potable water, seawater, bore
water, chlorinated pool water, brackish water or effluent.
A suitable location should be selected for the switch in
the delivery pipework of the pump. The switch should be
installed in a location that is away from both vibration and
heat, preferably out of direct exposure to the weather and
above any flood level. Drill and tap a 1/4” BSP thread in
the pipework at the required location and fit the PG20
Pressure Guard using a 1/4” brass or stainless nipple (not
supplied). The PG20 can be mounted in any orientation
required in either vertical or horizontal pipework.
Apply a suitable thread sealant tape or thread paste
and screw the PG20 and its interposing nipple into the
pipework using the spanner flats provided. When properly
installed the controller should be square to the axis of the
pipe with the controls in an accessible position.
ELECTRICAL
IMPORTANT
The PG20 Pressure Guard is available in a number of
configurations. Options include various supply voltages
and output contacts that may be normally open or
normally closed. The PG20 is also available with a built
in high capacity output drive system for the direct control
of large single phase pump motors. Check the model
number before installing this device to ensure you are
installing the correct model for the specific application.
The PG20 Pressure Guard requires a stable supply
voltage in order to operate correctly. Pay particular
attention to cable sizes and ensure cables are adequate
for the specific load. This is particularly important where
long cable runs are to be used in the installation. If the
voltage drop associated with the starting of the pump
motor is excessive the PG20 will automatically reset and
this may cause the pump to jog. Jogging can snap the
main spindle of a pump very easily, so please take all
precautions to ensure the voltage supply to the PG20 is
stable and that the current carrying capacity of the cable
is adequate for the job. For mains voltage applications we
recommend that the supply to the PG20 be isolated by a
10Amp RCD that has a maximum trip current of 30mA.
WARNING
When installing the PG20 the socket outlet
connection (GPO) for the input power must be
accessible and must be positioned in a dry and
protected location out of the weather and above
any flood or water level. Where the PG20 is to be
used to control pump motors up to 2.4kW 3HP
the supply to the PG20 must be protected by a
10 Amp fuse or by a 10 Amp circuit breaker.
FIXED INSTALLATION
WARNING
Mains voltage fixed installations must only ever
be carried out by a licensed electrician and must
conform to local wiring rules.
BROWNOUT OR BLACKOUT
If a blackout or brownout occurs while the PG20 is
operating, the pressure switch will not retain any memory
of its previous state. It will simply shut down the system.
When power resumes the PG20 will reboot, restart
the system and run the preset start-up time from the
beginning. A manual reboot can be done at any time by
simply pressing the reset button on the top deck of the
switch.
ADJUSTING SETTINGS
There are 4 rotary switches located under the clear cover
on the top deck of the PG20. These 4 dials are for adjusting
the settings that control the PG20’s actions. To access
the 4 dials undo the 2 screws that hold the clear cover in
place. Note that the clear cover must always be replaced
and tightened after making changes to the settings. Any
changes to the settings will not take effect until the reset
button is pressed or the supply is reset.
WARNING
Without the cover in place the PG20 is not water
resistant and presents a potential shock hazard.
Take great care not to splash water onto the
PG20 when the control cover is removed and
always replace the cover immediately and fully
tighten its securing screws after any changes to
the settings are made.
After you make any change to the settings on the 4
control dials you must always press the reset button
for the changes to take effect.
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