![background image](http://html.mh-extra.com/html/grant/monowave-series/monowave-series_installation-servicing-and-user-instructions-manual_2256805015.webp)
vessel in the balanced cold supply to accommodate thermal
expansion and prevent tightening of shower controls.
If the dwelling has a shower mixing valve (manual or
thermostatic) or a Bidet (over rim type) use the cold water
supply from the balanced cold water connection on the inlet
manifold for these outlets.
Do not use the balanced cold connection to supply bath taps
as this can reduce the flow of water available to the cylinder.
If the balanced cold water outlet is not required, blank off the
connection.
10. The Benchmark book enclosed with the cylinder should be
completed after commissioning of the system.
11. The cylinder must be registered with Grant UK within 30 days
of installation. Refer to Section 13 for further details on the
Cylinder guarantee.
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.
The vessel is supplied with a 22 mm compression connection and
should be connected to the 22 mm Tectite connection on the cold
water pipe just below the inlet manifold body.
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
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
7.5 for further details.
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 HP cylinders are fitted with a secondary return
connection. If a secondary return circuit is required it should be
connected to the MonoWave 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.
Section 4: Secondary circuit installation
Page 15
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