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The valve fitted to the Hydroswitch implements a path changeover between a common
port and the other 2 ports, as
shown opposite:
The ports of the solenoid valve
are not labelled; please refer to
the diagrams opposite for
standard port use.
The common port is normally
connected to the actuator via a
3-way manual valve (tap).
The other 2 ports are connected
to:
•
Pressurised water
(port shown as “
Pressure
Feed
”) or
•
Atmospheric air
(port shown as “Vent”).
To change from "O" to "A", the
manual override must be
turned from "O" to "C"
and then to "A" : " O
→
C
→
A".
Adapters must be fitted onto the valve prior to connecting the hoses.
When the Hydroswitch is disconnected from the control box it will (after 10 seconds)
switch into its default state. This connects a path between the ports labelled Common
and Pressure Feed in the above diagram. This default path is also the one that will be
active if the Control Box battery fails or some additional fault condition.
The most common system configuration is to require the PRV to go to the high pressure
condition should a fault exist in the control box. This will be the assumed requirement
for the descriptions within this manual.
Note: Sentinel 2 units can also be
factory configured
to support a low-pressure condition
during a fault. This is non-standard and requires changes to installation
plumbing and hidden software settings in the Control box. It will not be described in this
manual. Please discuss any requirements with your HWM representative.
Actuator
(normally via
a manual tap)
Pressure Feed
Vent
C
(Auto)
O
(Manual control)
Actuator
(Common)
Vent
Pressure Feed
