1 Introduction
4
Introduction
This manual is intended to guide
engineers in the installation and
maintenance of Grant VORTEX Eco
Wall Hung boilers. A User Guide for
the operation of this boiler is
attached to the reverse of this manual.
The following special text formats are
used in this manual for the purposes
listed below:
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 Eco Wall Hung boiler,
it is recommended that the heating
s
ystem is designed so that a
temperature differential of 20°C between
the flow and return is maintained. The
use of modulating circulating pumps
(now widely available) and effective
control systems should be considered.
The Grant Vortex boiler 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 75°C.
1.2 Boiler Description
The Grant VORTEX Eco Wall Hung
range of automatic pressure jet oil
boilers have been designed for use with
a fully pumped central heating system
with indirect domestic hot water
cylinder. They are not suitable for use
with either a direct cylinder or a
'primatic' cylinder or gravity hot water.
The boilers are suitable for use on
sealed central heating systems.
System models are supplied with the
necessary components factory fitted.
See Section 7.
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 9.4 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
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 Eco Wall Hung
condensing boiler contains 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
b
oiler it will be necessary to purchase
the Grant CF adaptor kit to correctly
connect this system to the boiler.
F
lue 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.