1 Introduction
4
Introduction
Warning of possible human injury as
a consequence of not following the
instructions in the warning.
To ensure maximum efficiency, the boiler
return temperature should be 55° C or
less, this will enable the latent heat to be
condensed out of the flue gases.
The boiler will achieve net thermal
efficiencies of 100%.
To achieve maximum performance from
the Grant VORTEX Pro Combi e boilers,
it is recommended that the heating
system is designed so that a
temperature differential of 20° C
between the flow and return is
maintained.
The Vortex Pro Combi e boilers will
however still operate at extremely high
efficiencies even when it is not in
condensing mode and therefore is
suitable for fitting to an existing heating
system without alteration to the radiator
sizes. The boiler is capable of a
maximum flow temperature of 78° C.
1.2 Boiler Description
The Vortex Pro Combi e boilers are
automatic pressure jet oil boilers
designed for use with a sealed central
heating system and will provide
domestic hot water at mains pressure.
All boilers are supplied with the control
panel and burner factory fitted.
All boilers can be connected to either a
conventional flue system or a balanced
flue system, as required.
The boilers are suitable for use in sealed
central heating systems only.
All models are supplied with the control
panel and burner factory fitted. The
boilers can be connected to either a
conventional flue system or a balanced
flue system, as required.
For Conventional Flue Applications
Where a chimney is to be lined - Grant
recommends the use of the Grant
‘Orange’ flue system, specifically
designed for the Vortex range of
condensing boilers. Refer to Section 9.2
for further details.
Caution concerning likely damage to
equipment or tools as a
consequence of not following the
instructions in the caution.
The flue system materials and
construction MUST be suitable for
use with oil-fired condensing boilers.
Failure to fit a suitable conventional
flue may invalidate the warranty on
the boiler.
For Balanced Flue Applications
The following flue kits are available from
Grant UK.
Refer to Section 9 for further details.
Yellow System
Standard low level concentric balanced
flue - components available:
•
Low level concentric balanced flue
short
•
Extensions 225mm, 450mm and
675mm
•
90° extension elbow
•
45° extension elbow
•
45° elbow
• Plume Diverter Kit
Green System
Standard external high level/vertical flue
starter kit (room sealed) - components
available:
• External high level/vertical flue
starter kit short (room sealed)
• Extensions 150mm, 250mm,
450mm, 950mm and adjustable
195 to 270mm
• 45° elbow
• High level terminal
• Vertical terminal
Note text. Used for emphasis or
information not directly concerned
with the surrounding text but of
importance to the reader.
1.1 How a Condensing
Boiler Works
During the combustion process,
hydrogen and oxygen combine to
produce heat and water vapour. The
water vapour produced is in the form of
superheated steam in the heat
exchanger. This superheated steam
contains sensible heat (available heat)
and latent heat (heat locked up in the
flue gas). A conventional boiler cannot
recover any of the latent heat and this
energy is lost to the atmosphere
through the flue.
The Grant VORTEX Pro Combi
condensing boilers contain an extra
heat exchanger which is designed to
recover the latent heat normally lost by
a conventional boiler. It does this by
cooling the flue gases to below 90° C,
thus extracting more sensible heat and
some of the latent heat. This is achieved
by cooling the flue gases to their dew
point (approximately 55° C).
!
WARNING
!
CAUTION
!
NOTE
!
NOTE
Where a rigid conventional flue - internal
to external - is required, Grant
recommends the use of a hybrid system
consisting of Grant 'Green' and
'Orange' flue system components. As
no flue adaptor is supplied with the
boiler it will be necessary to purchase
the Grant CF adaptor kit to connect this
system to the boiler correctly.
Flue adaptor kit - Ref. CFA15/70 - is
used for all models as they all use the
100mm 'Green' and 'Orange' system
components to construct a flue of
maximum vertical height 8 metres.
This manual is intended to guide
engineers in the installation and
maintenance of Grant Pro Internal
Combi e boilers. A separate manual
is available to guide users in the
operation of these boilers, and is
printed inverted at the end of this
manual.
The following special text formats are
used in this manual for the purposes
listed below:
To Next Page
Loading...
Need help?
General