Section 4: installation information
Page 14
4.6 Wash System
The Grant Vecta condensing boiler is supplied with an automatic
cleaning system to wash any ash build up from the tubes of the
condensing (secondary) heat exchanger.
This factory fitted wash system consists of two spray jets, mounted
on the heat exchanger access cover, connected by a manifold pipe
located on the upper side of the cover. Refer to Figure 4-3.
Figure 4-3:
Location of wash system in top of boiler
This is fed with mains cold water via a solenoid valve located in the
left side of the boiler. This is connected to the manifold by a flexible
hose and isolating valve (with integral check valve). Refer to Figure
4-3.
Connect the mains water supply for the wash down system to the
15mm compression connection located at the bottom rear corner of
the left side panel.
Connect the mains water supply for the wash system to the 15mm
compression connection on the water solenoid valve. This is located
at the side of the primary heat exchanger on the left hand side of the
boiler and accessed by removing the access panel on the left hand
boiler side panel.
The appliance must not be connected to the mains water supply via a
flexible hose.
a minimum inlet water pressure of 100 kPa (1 bar) is required
to maintain an adequate supply for cleaning purposes. the
maximum inlet water pressure is 800 kPa (8 bar).
in hard water areas an anti-scale device should be fitted on the
cold water supply to the wash system to prevent scale build-up
in the manifold pipe and jets.
nOtE
!
4.7 Before you Commission
To avoid the danger of dirt and foreign matter entering the boiler the
complete heating system should be thoroughly flushed out – both
before the boiler is connected and then again after the system has
been heated and is still hot. This is especially important where the
boiler is to be installed on an older system.
For optimum performance after installation, the boiler and the
associated heating system must be flushed in accordance with the
guidelines given in BS 7593:1992 ‘Treatment of water in domestic
hot water central heating systems’. This must involve the use of a
proprietary cleaner, such as Sentinel X300 (new systems), Sentinel
X400 (existing systems), or Fernox Restorer.
After cleaning, it is vitally important that all traces of the cleaner are
thoroughly flushed from the system.
For long term protection against corrosion and scale, after cleaning/
flushing a suitable inhibitor should be added to the system water,
such as Sentinel X100 or Fernox MB-1, in accordance with the
manufacturers’ instructions.
Failure to follow the above will invalidate the guarantee.
In order to provide further protection should there be a power failure
in cold weather, a combined anti-freeze and corrosion inhibitor
can be used such as Sentinel X500 or Fernox Alphi-11. Follow the
manufacturers’ instructions supplied to achieve the level of anti-freeze
protection required.
For details of the Sentinel Products visit www.sentinel-solutions.net
and for Fernox products visit www.fernox.com.
a Grant Mag-One in-line magnetic filter/s (or equivalent*)
must be fitted in the heating system pipework. this must be
installed and regularly serviced in accordance with the filter
manufacturers’ instructions.
* As measured by gauss. The Mag-One magnetic filter has a gauss
measurement of 12000
4.8 Completion
Please ensure that the Grant Vecta Commissioning form (supplied
with the boiler) is completed in full and that it is signed by the
householder/user.
Leave the white copy with the user, retain the pink copy for your own
records, and return the yellow copy to Grant to register the installation
of the boiler.
Ensure that the user guide (supplied with the boiler) is handed over to
the householder along with this Installation and Servicing manual.
4.9 ‘Meter Ready’ installations
Grant Vecta wood pellet boiler installations that are receiving a
Domestic Renewable Heat Incentive (RHI) payment will not usually
require a heat meter to be fitted.
However, all such domestic RHI installations must be ‘meter ready’ in
accordance with MCS requirements. Refer to the MCS Domestic RHI
Metering Guidance Document for full details.
