Note
:Theflue can be extended to clear a projection.
BUILDINGREGULATIONS1985excerpt.
Approved document J Part B 1.4(C) (D).
C) Protect with a terminal guard if it could come in
contact with people near the building or be subjected
to damage.
D)
Designed so as to prevent the entry of any matter
which might restrictthe flue.
(A terminal guard G.C. No 381782isavailable from).
Quinnel Barret& Quinnel Wireworks
Old Kent Road
London SE151NL Tel.081-639-l357
The air inlet/outlet duct and the terminal of the
appliance mustnot be closer than 25mm (1 in)to any
combustible material Detailed recommendations on
the protection of combustiable material are given in
BS5440Pt 1: 1990.
IMPORTANT NOTICE : TIMBER FRAMED HOUSES
IFTHEAPPLIANCEISTO BE FITTEDINA TIMBERFRA-
MEDBUILDING,ITSHOULDBEFITTEDINACCORDANCE
WITH THE BRITISHGAS PUBLICATION- “GUIDEFOR
GAS INSTALLATIONSIN TIMBER FRAMED HOUSING”
reference DM2. IF IN DOUBT, ADVICE MUST BE
SOUGHTFROMTHELOCALREGIONOFBRITISHGAS.
2.5 Air Supply
The room in which the boiler is installed does not re-
quire a purpose provided air vent.
If the boiler is installed in a cupboard or compartment
permanent air vents are required in the cupboard or
compartment, one at high level and one at low level
either direct to the outside air or to a room. Both
high and low level air vents must communicate with
the same space.
2.6
Position of vents Air from room Air direct from outside
Highlevel 264cm2(40in2) 132cm2(20in2)
Lowlevel 264cm2(40in2) 132cm2(20in2)
Electrical Supply
- Thisappliance must be earthed.
- All wiring external to the appliance must conform
to the current I.E.E.Regulations.
- The Celtic FFrequires a 240 V + 50 Hzsupply.
- Connection of the appliance and any system
controls to the mains supply must be through a
common isolator and must be fused at 3A maximum.
This should preferably be an unswitched shuttered
socket outlet and 3 pin plug to BS1363. Alternatively,
a double pole isolating switch may be used, provided
it has a minimum contact separation of 3 mm in both
poles. The isolator should be clearly marked showing
its purpose, preferably positioned close to the
appliance.
- Fusethe supply at 3A.
- The supply cord must be 0.75 mm* (24 x 0.2 mm)
three core to BS6500 Table 16.
2.7
3.
3.1
GasSupply
The Celtic FFrequires :
2.7 m3/h (95.35 ft3/h) gasflow.
The meter and supply pipes should be capableof deli-
vering this quantity of gas in addition to the demand
from any other appliances inthe house.
Thecomplete installation mustbe tested for soundness
asdescribed in BS6891: 1988
SYSTEM GUIDANCE
General
The low water content CELTICFFdual purpose boiler
includes the expansion vessel, safety overheat ther-
mostat, temperature and pressure gauges, and safe-
ty valve.
The thermostat is adjustable and on its maximum
setting gives a nominal 82” C (180” F)flow tempera-
ture. Detailed recommendations for water circulation
are given in BS5546 : 1990.Whilstthe boiler provides
hot water, there may be occasions when a cylinder
will be used, for instance, if the property has two
bathrooms. Detailed recommendations of this appli-
cation are given in sections 3.13to 3.16Thermostatic
control should be used in the heating circuits and the
cylinder if one isfitted.
It must be remembered that a combination appliance
has a limited volume of hot water that can be sup-
plied at any one time for a given temperature. Indeed
in most respects it is equivalent to a multipoint water
heater and many of the contraints associated with
multipoints apply equally to combination boilers.
The appliance has two separate functions, to provide
heating and hot water on demand. It can have a third
which is to supply hot water high demand through
the use of an indirect cylinder.
Sucha course could recommend itself if, for instance,
there is more than one bathroom or if the standard
and appointments of the property, such as basins in
all bedrooms and a large kitchen indicate a high usage
of hot water.
Hot water produced indirectly through a cylinder can
be used to satisfy high simultaneous demand outlets
- bathrooms etc. whilst the benefits of high efficien-
cy in generally small quantities of hot water, can be
fully utilised in kitchens, cloakrooms and so on.
Figs.14, 15, 16 and 17 indicate various layouts for the
production of hot water. It is recommended that only
a high recovery cylinder is used and circumstanceS
may from time to time dictate that a specialsaturated
heat exchanger in an indirect cylinder may be desira-
ble.
Separate time and temperature control over hot
water generated in this way can be achieved by the
use either of two port valves or three port valves of a
flow share or priority pattern (seenotes on drawing).
It isalso possible,where the occupation of the house is
variable,to provide either for a smallor large load.This
isbest achievedwith atall, smalldiameter cylinder. See
section 5for possiblewiring arrangements.
When using the hot water side of the appliance the
use of non-return valves and/or loosejumpered stop
cocks isjust as critical as with the conventional multi-
point and should be avoided. If a non-return valve is
fitted in the incoming water supply then an expan-
sion vessel MUSTbe fitted in the domestic hot water
circuit with a capacity of at least 0.16 litres.
10
