The unit is delivered in two packages (1) the cased boiler and (2) the flue
terminal assembly. The same flue terminal assembly is used for both sizes of
boiler. If required, extended flue tubes 1500 mm (59 in) long are available. A
plug-in programmer kit is also available to fit inside the boiler casing. This
programmer simplifies wiring and is suitable for use with all external control
systems shown in this instruction.
Gas supply
The 38/5OF requires 1.84 m
3
/h (66 ft
3
/h) of natural gas, the 20/35F requires
1.28 m
3/
h (46 ft
3
/h). The meter and supply pipes must be capable of delivering
this quantity of gas in addition to the demand from any other appliances in the
house.
The complete installation must be tested for gas soundness and purged as
described in CP331:3.
Electricity supply
240V 50Hz via a fused double pole switch with a contact separation of at least
3 mm in both poles or preferably a fused 3-pin plug and shuttered outlet
socket, adjacent to the boiler.
Fuse the supply at 3 amp.
Mains cable: 0.75 mm
2
(24 x 0.20 mm).
The external wiring between the appliance and the electrical supply shall
comply with the latest lEE Wiring Regulations, and any local regulations which
apply.
The appliance must be earthed.
In the event of an electrical fault after installation of the appliance, preliminary
electrical systems checks can be carried out as described in the British Gas
multimeter instruction book.
Air supply
1. The room in which the boiler is installed does not
require a purpose provided air vent.
2. 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 room or must
both be on the same wall to outside air. Both the high level and low level
vents must have a free area of 180 cm
2
(28 in
2
) for the 38/5OF and 123 cm
2
