HAMWORTHY HEATING LTD
12
CHESIL-ELECTRONIC
500001181/K
7.0 COMMISSIONING
Chesil Electronic Units are supplied factory set and tested to suit the system parameters shown in Figure 3. If the
application falls within these parameters the unit requires minimal commissioning checks.
7.1 Mechanical Installation
Check that the Chesil Unit and expansion vessel has been installed correctly, as detailed in section 6.2: Pipe-work
connections.
7.2 System Flushing
Ensure that the system has been flushed and all foreign matter has been removed, including pipe scale.
Note!
Should this material come into contact with the expansion vessel diaphragm it could result in premature
failure of the expansion vessel assembly.
7.3 Electrical Installation
Before working on Chesil units ensure the electrical supply & external circuits connected to the unit are isolated.
7.4 System Expansion Vessel (‘Burstock’ range)
To set or check the expansion vessel charge pressure the lock-shield valve between the Chesil unit and the
vessel must be closed. The drain cock fitted on the base of the expansion vessel must be open to allow any water
in the vessel to escape.
A suitable gauge should be used to check the charge pressure. Generally a Schrader ‘car type’ valve is fitted near
the top of the expansion vessel. If the charge pressure is too high it can be reduced by depressing the centre of
the Schrader valve or by using a pressure gauge with an integral air release valve. If the charge pressure is too
low a small increase can be provided using a car foot pump otherwise an oil free compressor or nitrogen bottle is
recommended.
Note!
The expansion vessel charge pressure should be set to 0.1 bar less than the cold fill pressure.
When the correct pressure is set the Schrader valve protective cap must be replaced.
Check the integrity of the pipe-work. Ensure the lock-shield valve between the Chesil unit and the expansion
vessel is open and the drain valve is closed. Ensure the air purge plug is fitted (near the top of the expansion
vessel).
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