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3.8 Installing the Water Heater
The following elements are supplied with the heater :
1x Cold water inlet pipe
1x Cold water inlet tap
1x Flexible hot-water outlet tube 1x Gas inlet pipe
1x Twin flue air inlet adaptor
1x Gas inlet tap
The dimensions for installing the appliance are detailed in
Sections 3.5 and 3.6 (page 9).
Siting the Appliance
The location chosen for the appliance must permit the provision
of a satisfactory flue termination (see Fig. 10, Section 3.7). The
location must also permit adequate space for servicing and air
circulation around the appliance (see Fig. 9, Section 3.6).
The appliance may be installed in any room or internal space,
although particular attention is drawn to the current require-
ments of the current edition of BS7671, in Scotland, the electri-
cal provisions of the Building Standards applicable in Scotland,
and in Ireland in line with the electrical provisions of I.S. 813,
with respect to the installation of a heater in a room or internal
space containing a bath or shower.
Where a room sealed appliance is installed in a room contain-
ing a bath or shower, any electrical switch or appliance control
using main electricity should be situated so that it cannot be
touched by a person using the bath or shower.
Where the installation of the appliance will be in an unusual
location, special procedures may be necessary, the current edi-
tion of BS 5546 should be consulted.
In the event that the appliance is to be installed in a timber
framed building, it should be fitted in accordance with the British
Gas Document 'Guide for Gas Installations in Timber
Framed Housing' reference DM2. If in doubt, advice must be
sought from British Gas.
Gas Supply
An adequate sized gas meter must be connected to the service
pipe. Where necessary the local gas supplier will arrange for
the existing meter to be checked or for a suitable meter to be fit-
ted.
Installation pipes should be fitted in accordance with BS 6891.
Pipework from the meter must be of adequate size. Pipes of a
smaller size than the gas connection must not be used.
The complete installation must be tested for gas soundness and
purged in accordance with the current edition of BS 6891.
Air Supply
The appliance does not require any purpose provided ventila-
tion.
Electrical Supply
The appliance must be earthed.
The installation must be undertaken by a competent electrician
and should be in accordance with the current edition of BS
7671.
Particular attention should be paid to cross bonding.
2x Plastic wall plugs
2x Screw hooks
1x Restrictor
Assorted washers
The appliance must be provided with a means of isolation. If
installed in a bathroom, the means of isolation must be external
to the bathroom or a double pole cord switch fitted.
Acceptable methods of connection are:
• A switched double pole fused spur with 3mm contact
separation on all poles.
• A double pole switch where the supply must be suitably
fused 3A.
• An unswitched socket outlet complying with BS 1363.
A three core cable should be used and a heat resistant cable of
0.75 mm
2
(24 x 0.2 mm) is considered suitable.
Removing the Outer Case
Remove the gas and water control knobs;
Loosen the screw behind the control knob that secures the outer
case;
Release the two locks on the top of the casing and remove the
case (See also Section 7.1.1, page 20).
Wall Mounting
Fix the two screw-in hooks to the wall and hang the water heater
on them.
Connecting the Heater to the Water and Gas Supplies
Before connecting up the appliance it is necessary to thorough-
ly flush and purge the water and gas pipes in order to remove
filings or other waste from them;
Connect the water heater using the corresponding washers and
connectors which are supplied in the bag of accessories;
Place the casing back on and secure it in place;
Replace the gas knob and the temperature selector knob;
Sealing the Water Circuit
Open the water inlet tap into the appliance by turning the water
inlet tap on the heater fully on. Bleed any air from the water
pipes by opening all the taps: hot and cold. Then turn off all the
taps and check for watertightness.
Sealing the Gas Circuit
IMPORTANT!
Test for soundness in accordance with current regulations.
Connecting the Water Heater to the Electrical Mains
The water heater is fitted with an electrical supply cable for a
220-230V~50Hz mains supply. It is to be connected to a single-
phase power supply with an earth.
In order to protect the heater it is necessary to have a bipolar
switch with a minimum opening distance of 3 mm.
IMPORTANT : Whenever carrying out an operation on the
electrical installation of the heater, make sure that the
heater is disconnected from the mains power supply
The new power cable is to have the same specifications as the
one originally installed in the heater.
The means to isolate the power supply should be easily acces-
sible.
11
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