Boiler Installation
Information
17
4
.11 Pipework Materials
Grant boilers are compatible with both
copper and plastic pipe. Where plastic
pipe is used it must be of the oxygen
barrier type and be of the correct class
(to BS 7291:Part 1:1990) for the
application concerned.
For Long term protection against
corrosion and scale, after flushing, it is
recommended that an inhibitor such as
Betzdearborn's Sentinel X100 or Fernox
MB-1 is dosed in accordance with the
guidelines given in BS 7593:1992.
Failure to implement these guidelines
will invalidate the warranty.
4.9 Heating System Design
Considerations
To achieve the maximum efficiency
possible from the Grant VORTEX Eco
Wall Hung boiler, the heating system
should be designed to the following
parameters:
Radiators:-
• Flow temperature 70°C
• Return temperature 50°C
• Differential 20°C
Underfloor:-
• Flow temperature 50°C
• Return temperature 40°C
• Differential 10°C
Size radiators with a mean water
temperature of 60°C.
Design system controls with
programmable room thermostats or use
weather compensating controls to
maintain return temperatures below
55°C.
The boiler should not be allowed to
operate with return temperatures of
less than 40°C when the system is up
to operating temperature.
The use of a pipe stat is recommended
to control the return temperature when
using weather compensating controls.
4.10 Underfloor Heating Systems
In underfloor systems it is essential that
the return temperature must be
maintained above 40°C to prevent
internal corrosion of the boiler water
jacket.
Failure to install and commission
a
ppliances correctly may invalidate
the boiler warranty.
Before starting any work on the
boiler, or fuel supply please read the
health and safety information given in
S
ection 14.
4.7 Completion
Please ensure that the OFTEC CD/10
installation completion report (provided
with the boiler) is completed in full.
Leave the top copy with the User.
Retain the carbon copy.
Ensure that the User Information pack
(supplied with the boiler) is handed over
to the Householder.
4.8 Before you Commission
To avoid the danger of dirt and foreign
matter entering the boiler the complete
heating system should be thoroughly
flushed out - 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 used on an old system.
For optimum performance after
installation, this boiler and its associated
central 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
BetzDearborn's Sentinel X300 or X400,
or Fernox Restorer. Full instructions are
supplied with the products, but for more
details of BetzDearborn’s products, view
the website www.sentinel-solutions.net
and for more details of Fernox products
view the website www.fernox.com.
The system should incorporate a
low-pressure switch to shut off
power to the boiler if the system
pressure drops below 0.2 bar.
A suitable low pressure switch kit is
available to purchase from Grant
Engineering (UK) Limited, Part No.
MPCBS 62.
4.13 Underfloor Pipework
Plastic pipe may be used on Underfloor
systems where the plastic pipe is fitted
after the thermostatic mixing valve.
Copper tube must be used for at least
the first metre of flow and return primary
pipework between the boiler and the
underfloor mixing/blending valves.
!
NOTE
The first metre of pipework
connected to both the heating flow
and return connections of the boiler
must be made in copper on all types
of system - sealed or open-vented.
4.12 Sealed Systems
If plastic pipe is used, the installer must
check with the plastic pipe
manufacturer that the pipe to be used is
suitable for the temperature and
pressures concerned.
Plastic pipe must be Class S to
BS 7291: Part 1:1990.
!
NOTE
!
WARNING
!
WARNING
To Next Page
Loading...
Need help?
General
