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9.6. Expansion vessel
The expansion vessel is mandatory on this product and is available within the Rointe
installation kit (sold separately). It MUST be fitted to the safety group and positioned
with the entry point at the bottom (Fig 6). We recommend to mount the expansion vessel
higher than the water heater to avoid draining the water heater when maintaining and
replacing the expansion vessel. It is important to check the pre-charge pressure of the
expansion vessel membrane before filling the cylinder. The expansion vessel should be
pressurised to 0.15 or 0.3 MPa at all times.
9.7. Expansion relief valve
The expansion relief valve must be installed between the pressure reducing valve and
the product (Fig 6). No other valve should be fitted between this valve and the cylinder.
The expansion relief valve contains a non return valve. The discharge pipework from the
expansion relief valve must be installed constantly falling to an open point of discharge. It
is recommended to combine it with the discharge of the T/P valve (Fig 6).
9.8. T/P valve
The T/P valve (temperature and pressure relief valve) is supplied factory fitted as part of
the product, to meet the requirements of the G3 building regulations. It complies with the
BS EN 1490 standard. The valve is pre-calibrated to lift at 0.7 MPa or 90ºC. The T/P valve
should not be removed or modified in any way and if done so, will render the guarantee
invalid.
The outlet of the T/P valve should be routed in 15mm copper piping, in a downward di-
rection alongside the product to the tundish. The outlet of the expansion relief valve must
be T’d into this pipe before the tundish. This is so any water exiting either valve can drain
through the tundish (see diagram opposite).
The T/P valve must be discharged directly or by way of a manifold via a short length of
pipe (D1) into a tundish. The discharge pipe must be installed in a continuous downward
direction and in a frost free environment. Water may drip from the discharge pipe and this
pipe must be left open to the atmosphere. The diameter of the discharge pipe (D1) should
not be less than the nominal outlet size of the safety device e.g. T/P valve.
Where a manifold is used it should be sized to accept and discharge the total discharge
from all D1 discharge pipes connected.
9.9. Tundish
The tundish should be vertical and located in the same space as the product and clearly
visible to the user. It must be fitted in close proximity to the safety device and close to
the
Summary of Contents for Dalis Pro 200DHW5
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