The pressurisation unit is fitted with a break tank (1) which is filled from the mains water supply (2)
via a float operated valve (3). The break tank is fitted with an overflow (4) in case the break tank
overfills and a weir overflow (6) in case the primary overflow fails.
Dry-running protection is provided by the float switch (5). The pressurisation unit is connected
into the heating or cooling systems (7) via an isolation valve and flexible hose(8). System
pressure is monitored via the pressure sensor (9).
If the pressure sensor detects a drop in pressure, the pump (10a) will pump water from the break
tank into the system. Once the required pressure has been reached, the pump will stop.
On twin pump models, a second pump (10b) is provided. The two pumps will run in a duty/standby
configuration (i.e. the active pump will alternate with each pump start).
Backflow prevention is provided by the integral non-return valve in the pump(s) and an
additional non-return valve (11) in the outlet manifold.
Installation
This pressurisation unit is not designed to be installed in an
outdoor environment. The unit must be installed in a dry,
non-condensing and frost free environment, away from
precipitation and water sprays/jets. If there is a risk of flooding, the
unit must be installed on a raised plinth.
Please refer to the appropriate datasheet for the maximum working
pressure and temperature of the pressurisation unit. The
conditions at the point of connection to the system must not
exceed these values.
Pipe Connections
To avoid damaging the float valve, the mains water supply pipe
must be flushed
before connection to the pressurisation unit.
All pipe connections must be made with appropriate jointing
compound/PTFE tape. If PTFE tape is used, care must be taken
to ensure that the tape does not obstruct the orifice of the fitting.
Non-return valves, pressure reducing valves and RPZ valves
must not be installed between the pressurisation unit and the
heating/cooling system. These devices will prevent the pressure
sensor from reading the system pressure.
The pressurisation unit and expansion vessel should be
connected to the system at the same point, to provide a neutral
pressure reading. This point of connection should be in the
system return, on the suction side of the circulation pump.
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