Equipment Overview; Principal Of Operation - Boss MX1-3HL Operation & Maintenance Manual

Equipment Overview

The function of this pressurisation unit is to provide a means of automated water top-up to sealed heating and
cooling systems. The equipment is designed to provide periodic water top-up to compensate for minor losses in
system pressure (e.g. slow leaks, air venting, etc.).
This equipment is not designed to cope with sudden losses of system pressure (e.g. manual
draining) or major water losses (e.g. large leaks). The equipment is also not intended to be used
for water boosting applications.

Principal of Operation

The following schematic shows the internal arrangement of a pressurisation unit:
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 (5) in case the primary overflow fails.
The pressurisation unit is connected into the heating system (6) via an isolation valve (7).
The pressure switch (PS) monitors the system pressure. High/Low Switch (H/L) is connected to the boiler to
control the cut in and cut out of boiler pressure
If the pressure sensor detects a drop in pressure, the pump (8a or 8b) 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 (8b) is provided. On mechanical unit you can select either pump with a
pump selection switch
We reserve the right to change designs and technical specifications of our products
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Rev 2.1 Oct-15 Page 6 / 28