4.4
EXPANSION VESSEL
A suitable expansion vessel with a pre-charge pressure of 3bar is
supplied for fitting to all cylinders.
This expansion vessel must be connected into the cold water
supply, between the expansion relief valve (in the inlet manifold)
and the cylinder using the flexible hose provided.
A ¾” BSPF connection is provided on the supplied cold water inlet
manifold, for the purpose of expansion vessel connection. Refer
to Section 4.3 and Figure 4-1.
Mount the expansion vessel in a suitable position on an adjacent
wall to the cylinder using the wall brackets on the vessel.
The expansion vessel must be positioned with the connection
point at the bottom.
No valve should be fitted between the expansion vessel and the
cylinder.
The air charge pressure in the expansion vessel must be regularly
checked (e.g. at every service) and topped up as necessary. The
correct air charge pressure is 3.0bar.
Refer to Sections 7.1 and 7.4 for further details.
! NOTE !
The 19 litre vessels (supplied with the 170 and 200 litre
MonoWave cylinders) and the 24 litre vessels (supplied
with the 250 and 300 litre MonoWave cylinders) are EITHER
supplied with:
•
a ¾” BSPM connection - allowing for direct
connection to the supplied expansion vessel hose.
OR
•
a 22mm compression fitting.
In this instance, a 22mm compression to 3/4” BSPM
adapter will be supplied, for connection to the
supplied expansion vessel hose.
A short length of 22mm pipe will therefore need to be
sourced and fitted between the 22mm compression
fittings at the expansion vessel and the expansion
vessel hose adapter.
4.5
TEMPERATURE AND PRESSURE
RELIEF VALVE
The temperature and pressure relief valve (T&P Valve) is supplied
factory fitted to the cylinder. The T&P valve must not be removed
from the cylinder or tampered with in any way. The valve is pre-set
to lift at 7bar or 90°C and any attempt to adjust it will invalidate the
guarantee.
4.6
HOT WATER SUPPLY
Connect the hot water supply pipe to the top outlet of the cylinder.
4.7
PREVENTION OF SCALDING
Building Regulations Approved Document G (Part G3) requires
that the hot water temperature supplied to a bath should be
limited to a maximum of 48°C by using an in-line blending valve
(not supplied with the cylinder) with a maximum temperature stop.
The length of the supply pipe between the blending valve and the
bath hot water outlet should be kept to a minimum to prevent the
colonisation of waterborne pathogens (e.g. legionella). Refer to
Approved Document G for further details.
4.8
SECONDARY RETURN
All MonoWave indirect HP cylinders are fitted with a secondary
return connection. If a secondary return circuit is required it should
be connected to the MonoWave indirect HP cylinder as shown in
Figure 4-2.
! NOTE !
If a secondary circulation circuit is installed then a larger
expansion vessel may be required to handle the increase
in volume.
Balanced cold supply for showers
or bidet only (see Section 4.2)
Secondary
return line
Circulation
pump
Non return
valve
Cold inlet
Balanced cold
supply outlet
.
Figure 4-2:
Secondary return circuit
Page 19
Section 4: Secondary Circuit Installation
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