9
Combi 70 & Combi 90 Oil Boilers
Installation of a Combi boiler must be in accordance
with the following recommendations:-
a Building Regulations for England and Wales,
and the Building Standards for Scotland issued
by the Department of the Environment and any
local Byelaws etc.
b Model and local Water Undertaking Byelaws.
c Applicable Control of Pollution Regulations.
d The following OFTEC requirements:-
OFST 100 Polythene oil storage tanks for
distillate fuels.
OFST 200 Fuel oil storage tanks and tank
bunds for use with distillate fuels,
lubrication oils and waste oils.
Further information may be obtained from the
OFTEC Technical Information Book 3
(Installation requirements for oil fired boilers
and oil storage tanks).
The installation should also be in accordance with the
latest edition of the following British Standard Codes
of Practice:-
BS 715 Metal flue pipes, fittings, terminals
and accessories.
BS 799:5 Oil storage tanks.
BS 1181 Clay flue linings and flue terminals.
BS 4543:3 Factory made insulated chimneys for
oil fired appliances.
BS 4876 Performance requirements for oil
burning appliances.
BS 5410:1 Code of Practice for oil firing appliances.
BS 5449 Forced circulation hot water systems.
BS 7593 Code of Practice for treatment of
water in heating systems.
BS 7671 Requirements for electrical
installations, IEE Wiring Regulations.
Failure to install and commission appliances
correctly may invalidate the boiler warranty.
IMPORTANT
Before starting any work on the boiler, or fuel supply
please read the health and safety information given in
section 13 on page 55.
The Combi 70 and Combi 90 automatic pressure jet oil
boilers have been designed for use with a sealed
central heating system and will provide domestic hot
water at mains pressure.
The boiler is supplied with the burner fitted and suitable
for a conventional flue. If the boiler is to be used with a
balanced flue, a Balanced Flue Kit is required.
The burner is ready to connect to a single pipe system
with a loose flexible fuel line (900 mm) and
3
/
8
" to
1
/
4
"
BSP male adaptor supplied with the boiler. If required, an
additional flexible fuel line (900 mm) and
3
/
8
" to
1
/
4
" BSP
male adaptor are available from Grant Engineering (UK)
Limited, for two-pipe oil supply system.
As supplied, the burner is suitable for use with Class
C2 Kerosene. If required, it can easily be adapted for
use with Class D gas oil.
Note: Only Kerosene may be used with a low level
balanced flue.
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 2.3. To change the nozzle,
remove the burner from the boiler then remove the
nozzle as described in section 8.4. The installer must
amend the boiler data label accordingly.
The temperature of the water leaving the boiler to heat the
radiators is User adjustable from 75 to 85°C, however, to
achieve the optimum hot water performance the boiler
thermostat should be set to maximum.
The maximum domestic hot water temperature is factory
set at 65°C.
The boiler control panel has the facility to accommodate
a plug-in timer to allow the user to set the operating times
for the central heating. Two plug-in timer options are
available - either a 24-hour mechanical timer or a 7-day
electronic timer.
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 is ideal. Refer to section 10 - wiring diagrams.
Domestic hot water is available at all times, provided
the boiler is switched on.
3 - GENERAL BOILER INFORMATION
Boiler description
3.1
Regulations to comply with
3.2
Regional statutory requirements may deem this appliance to be a 'controlled service'.
Where this is the case, it is a legal requirement that the appliance is installed and
commissioned either under the remit of building control or by a 'Competent person' such
as a suitably qualified Oftec registered technician.
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