Grant Vortex VTXBH15/26 User Manual

Section 1: IntroductionPage 4
1.1 HOW A CONDENSING BOILER OPERATES
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 ue gas). A conventional boiler
cannot recover any of the latent heat and this energy is lost to the
atmosphere through the ue.
The Grant Vortex 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 ue gases
to below 90°C, thus extracting more sensible heat and some of
the latent heat. This is achieved by cooling the ue gases to their
dew point (approximately 55°C).
To ensure maximum e󰀩ciency, the boiler return temperature
should be 55°C or less, this will enable the latent heat to be
condensed out of the ue gases.
• The boiler will achieve net thermal e󰀩ciencies of 100%.
To achieve maximum performance from the Grant Vortex boiler,
it is recommended that the heating system is designed so that a
temperature di󰀨erential of 20°C between the ow and return is
maintained.
The Grant Vortex boiler will however still operate at extremely
high e󰀩ciencies even when it is not in condensing mode and
therefore is suitable for tting to an existing heating system
without alteration to the radiator sizes. The boiler is capable of a
maximum ow temperature of 75°C.
1.2 BOILER DESCRIPTION
The Grant Vortex Boiler House 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 open vented or sealed central
heating systems. Refer to Section 7.
The boilers are supplied with a separate burner and dual
thermostat (15-26 and 26-46 models only).
The dual thermostat is supplied factory tted on the 46-70 models.
All the models in the current Grant Vortex range of boilers are
designed to comply with the maximum NOx emissions* under the
Energy-related Products Directive (ErP).
* From the 26th September 2018, the maximum NOx emissions
for all new oil red boilers (up to and including 400kW for both
new build and replacement boiler installations) is 120mg/kWh.
1.3 FLUE OPTIONS
The boilers can be connected to either a conventional ue system
or a balanced ue system, as required.
1.3.1 FOR CONVENTIONAL FLUE
APPLICATIONS
Where a chimney is to be lined - Grant recommends the use
of the Grant ‘Orange’ ue system, specically designed for the
Vortex range of condensing boilers. Refer to Section 9.2 for
further details.
Where a rigid conventional ue is required, Grant recommends
the use of the Grant ‘Hybrid’ ue system, which uses components
from the Grant ‘Orange’ and ‘Green’ ue systems. Refer to Figure
9-4 for details. This ue system is suitable for all Grant oil boilers
up to and including the Vortex 46-70.
The ‘Orange’ system ue components used for the internal part of
the Hybrid system (extensions and elbows) are from the smaller
100mm size range (e.g. WE45/100 elbow, WX450/100 450mm
extension, etc.) – refer to Table 9-3.
The ‘Green’ system twin wall ue components used for the
external part of the Hybrid system are from the larger ‘200’ size
range (e.g. GTV/200B terminal, GX950/200B 950mm extension,
etc.) that have a 100mm internal ue diameter – refer to Table 9-5.
The Grant ue adaptor kit (Grant product code: CFA15/70) will
also be required as this contains:
a) the ue adaptor required to connect the ‘Orange’ system
ue components to the boiler ue outlet (no ue adaptor is
supplied with the boiler).
b) the adaptor to connect the single wall ‘Orange’ system ue to
the twin wall ‘Green’ system ue.
The maximum vertical height (from the top of the boiler to the
terminal) of the ‘Hybrid’ Green/Orange ue system is 19 metres.
! NOTE !
The ue system materials and construction MUST be
suitable for use with oil-red condensing boilers. Failure
to t a suitable conventional ue may invalidate the
guarantee on the boiler.
1.3.2 FOR BALANCED FLUE APPLICATIONS
The following ue kits are available from Grant UK. Refer to
Section 9.4.
Yellow system
Standard low level concentric balanced ue - components
available:
• Low level concentric balanced ue kit - short and standard
lengths available
• Extensions 225 mm, 450 mm and 675 mm (internal use only)
• 90° extension elbow (internal use only)
• 45° extension elbow (internal use only)
• 45° elbow (internal use only)
• Plume diverter kits
Green system
Standard external high level/vertical ue starter kit (room sealed) -
components available:
• External high level/vertical ue starter kit short (room sealed)
• Extensions 150 mm, 250 mm, 450 mm, 950 mm
• Adjustable extension 195 to 270 mm
• 45° elbow
• High level terminal
• Vertical terminal
White system
High level and vertical concentric balanced ue kit- components
available:
• Extensions 225 mm, 450 mm, 950 mm
• Adjustable extension 275 to 450 mm
• Vertical concentric balanced ue kit
• 45° elbow
Red system (15-26 only)
A exible vertical balanced ue system designed to be tted inside
an existing masonry chimney.
Consisting of three sections:
• Concentric white painted ue pipe connected to the boiler
• Vertical concentric exible ue (exible stainless steel ue liner
inside a stainless steel air inlet liner)
• Terminal assembly for chimney top mounting
Flue extensions and 45° elbows from the White system may be
used.
Fitting instructions for the Low level, High level and Vertical
balanced ue systems are supplied with the kits.
1 INTRODUCTION

Grant Vortex VTXBH15/26 Specifications

General

Brand	Grant
Model	Vortex VTXBH15/26
Category	Boiler
Language	English