Technical data

6
6 Gas supply
The appliance requires 1.1 m
3
/hr of gas. The gas meter
and supply pipes must be capable of supplying this quantity
of gas in addition to the demand from any other appliances
being served. Refer to BS 6891 for further information.
The meter governor should deliver a dynamic pressure of
20 mbar (8 in w.g.) at the appliance.
The complete installation, including the gas meter, must
be tested for soundness and purged. Refer to BS 6891.
A gas service cock must be fitted before each appliance,
a gas service cock is supplied with every appliance.
Important: if the 1.1 m
3
/hr gas rate to the appliance cannot
be reached, the specified hot water conditions will not be
achieved. This could result in customer complaints. Always
ensure that the gas supply is adequate.
7 Installation
The installation must be carried out by competent persons.
On delivery, check to make sure that the packaging has
not been damaged. If there is evidence of damage, contact
your supplier immediately.
Check the 10 digit code number on the appliance carton
to ensure that the correct appliance for the gas supply
has been supplied.
The code number for a natural gas appliance is 7 700 352
952. The code number for an LPG appliance is 7 700 452
908.
7.1 Appliance Installation
a) Unpack the appliance and take care to remove the
installation kit which is packed on top of the polystyrene
packing
The kit comprises of the following:
- One gas service cock with fibre washer
- One cold water isolating cock complete with fibre
washer
- One water discharge pipe complete with brass swivel
union
- Two fixing screws and wall plugs.
b) Lay the appliance on its back and pull off the Hot and
Cold water control Knobs and the Temperature control
knob. Unscrew the temperature control outer bezel to
release the casing from the appliance. Lift up the lower
front edge of the case and slide towards the top of the
heater to unhook the case from the back panel.
c) Offer up the appliance to the wall and mark the positions
for the two fixing screws. Drill two holes and fit the wall
plugs and screws.
Hang the appliance on the fixing hooks and secure the
appliance back panel to the wall through one of the
two holes located at the lower left hand side of the panel.
d) Make up the gas supply to the upper connection on
the gas control assembly using the fibre washer
provided. Fit the gas isolation cock as close as possible
to the appliance (see fig. 4, pos. 1).
e) Connect the appliance to the incoming cold water
supply via the fitting which includes the stop valve. A
fibre washer is provided (see fig. 4, pos. 2).
f) Fit the brass union for the water discharge pipe to the
water control valve outlet using the fibre washer
provided. Fit the chrome plated discharge pipe to the
union and tighten sufficiently to allow the pipe to swivel
(see fig. 4, pos. 3).
g) Turn on the water supply to the appliance. Open the
stop valve on the inlet fitting to the appliance and the
open the hot and cold water taps.
Allow water to flow to vent the system and close the
taps.
h) If the appliance is not to be commissioned straight away,
re-fit the appliance casing and control knobs.
8 Comissioning
Before commissioning the appliance, the whole gas
installation must be purged and tested for gas soundness
in accordance with the current edition of BS 6891.
Important: Open all doors and windows. Extinguish naked
lights and do not smoke while purging the gas line.
Proceed as follows.
a) Ensure that the gas service cock in the gas inlet pipe
is turned off.
b) Remove the appliance casing as described in section
7 above.
c) Loosen screw A and connect a pressure gauge to the
test point. See fig. 5.
Fig. 5
G661_016
Fig. 4
1
2
3
G081_240