Boss Direct / Indirect Installation Guide
11
Balanced Cold Connection
If there are to be showers, bidets or monobloc taps in the installation then a balanced cold supply is
necessary. There is a 22mm balanced connection on the inlet control set.
Fitting The Inlet Control Group
Excess pressure can lead to the cylinder bursting. The inlet control set supplied has an expansion
relief valve with a 15mm connection to allow it to be connected to the tundish. Make sure that there is
sufficient space for future maintenance and also for connection of the discharge pipe for the expansion
relief valve.
It is essential that this connection is not covered or closed. The hot water expansion vessel should be
hard fixed into pipework and insulated.
Hot Water Pipework
Run the first part of the hot water distribution pipework in 22mm. This can be reduced to 15mm and
10mm as appropriate for the type of tap etc. Your aim should be to reduce the volume of the hot
draw-off pipework to a practical minimum so that the time taken for the hot water is as quick as possible.
Do not use monobloc mixer tap or showers if the balanced cold connection is not provided. Outlets
of this type can back pressurise the unit and result in discharge.
Expansion Vessel
The expansion vessel receives the increased water volume when expansion takes place as the system
heats up and it maintains a positive pressure in the system. The expansion vessel contains a flexible
diaphragm, which is initially charged on one side with nitrogen, but can be topped up with air when required.
Select a suitable position for the expansion vessel. Mount it to the wall using the bracket provided
(0-24L only, 35L and above are floor standing) and hard fix into pipework and insulate. Ensure that the
top of the vessel is accessible for servicing. The pipe connecting the expansion vessel to the system
should have a diameter of not less than 15mm and must not contain any restrictions.
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