4.7. Expansion vessel
A suitable expansion vessel (Fig. 2 - Pt. 9) with a pre-charge
pressure of 0.15 or 0.3 MPa is available in an optional kit for fitting
to all water heating units in the range. The expansion vessel MUST
be fitted to the safety group. The expansion vessel MUST be
positioned with the entry point at the bottom – see Figure 2.
IMPORTANT: Regular checks must be carried out to ensure that
the expansion vessel is correctly pressurised to 0.15 or 0.3 MPa at
all times. – see Figure 2.
4.8. Tundish
The tundish (Fig. 2 - Pt. 8) must not be positioned above or in
close proximity of any electrical current carrying devices or wiring.
The installation should conform with the requirements of item 4.9
below.
4.9. Discharge arrangement
The tundish (Fig. 2 - Pt. 8) must be installed in a position so that
it is clearly visible by the user. In addition, the discharge pipe (Fig.
2 - Pt. 6) from the tundish should terminate in a safe place where
there is no risk to persons in the vicinity of the discharge, be of
metal, and:
(a) Be at least one pipe size larger than the normal outlet size of
the safety device unless its total equipment hydraulic resistance
exceeds that of a straight pipe 9m long, i.e. discharge pipes
between 9m and 18m equivalent resistance length should be at
least two sizes larger then the normal outlet size of the safety
device, between 18m and 27m at least three sizes larger and
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