Boiler Description - Grant Combi 70 V3 User's Installation Manual

5.1

Boiler description

The Combi and Vortex Combi 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 Combi V3 and Combi Max boilers are supplied
ready to connect to a conventional flue. If the boiler is
to be used with a balanced flue, a Balanced Flue Kit is
required.
The Vortex Combi boilers are not supplied with a
flue adaptor. If a conventional flue is to be used, a
Grant conventional flue adaptor (Ref. CFCA1546)
must be ordered.
For conventional flue applications, Grant recommends
the use of the Grant 'Orange' flue system, specifically
designed for the Vortex condensing boiler. Refer to
Section 5.8 for further details.
Fitting instructions for the Low level concentric, High
level and Vertical balanced flue kits are supplied with
the kits.
Where a balanced flue system is required, the following
flue kits are available from Grant UK.
Refer to Section 5.8 for further details.
Yellow system ..... Standard low level concentric
balanced flue - components available:
Low level concentric balanced flue short
Extensions 225 mm, 450 mm and 675 mm
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 150 mm, 250 mm, 450 mm, 950 mm
and adjustable 195 to 270 mm
45° elbow
High level terminal
Vertical terminal
5 - GENERAL BOILER INFORMATION
Combi V3, Combi Max and Vortex Combi models
White system ...... High level concentric balanced flue
kit - components available:
Extensions 225 mm, 450 mm, 950 mm and
adjustable 275 to 450 mm
45° elbow
Vertical concentric balanced flue kit
Extensions 225 mm, 450 mm, 950 mm and
adjustable 275 to 450 mm
45° elbow
The Combi V3 and Combi Max boilers are supplied
ready for use with Class C2 kerosene. If required, they
can easily be adapted for use with Class D gas oil.
Note: Only Kerosene may be used with a low level
balanced flue, unless the flue terminal is higher than
2.0 m above outside ground level.
If the fuel to be used is Gas Oil, it will be necessary to
change the burner nozzle. Refer to the Technical
Information in Section 4.3. To change the nozzle,
remove the burner from the boiler then remove the
nozzle as described in Section 10.4. The installer must
amend the boiler data label accordingly.
The Vortex Combi boilers are only suitable for use
with Kerosene.
All burners are ready to connect to a single pipe system
with a loose flexible fuel line (600 mm) and
BSP male adaptor supplied with the boiler. If required, an
additional flexible fuel line (600 mm) and
male adaptor are available to purchase from Grant
Engineering (UK) Limited, for two-pipe oil supply system,
Part No. RBS104.
The temperature of the water leaving the boiler to heat the
radiators is User adjustable.
To achieve the optimum hot water performance from the
Combi V3 and Combi Max, the boiler thermostat should
be set to maximum.
The setting of the boiler thermostat on the Vortex Combi
has no effect on the hot water performance.
The control panel is fitted with an ON/OFF switch,
boiler thermostat control knob and the manual reset
button for the overheat thermostat. An optional plug-in
programmer is available which allows the User to set
the operating times for central heating and hot water.
Alternatively, an external timer, located remotely from
the boiler in a convenient position for the user, may be
connected to the boiler for this purpose - the Grant TCR
kit, Part No. TCRKIT is ideal. Refer to Section 12 -
Wiring diagrams.
A programmable electronic room thermostat, Part No.
RSKIT is also available to purchase from Grant UK.
Domestic hot water is available at all times, provided
the boiler is switched on.
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