6
221051B
6
SECTION
General
1
Gas Supply
Electrical Supply
Draining Tap
Safety Valve
The gas installation shall be in accordance with the
current issue of BS6891.
The supply from the governed meter must be of
adequate size to provide a steady inlet working
pressure of 20mbar (8in wg) at the boiler.
On completion test the gas installation for
soundness using the pressure drop method and
suitable leak detection fluid, purge in accordance
with the above standard.
WARNING. THIS BOILER MUST BE
EARTHED.
All system components shall be of an approved type
and shall be connected in accordance with the
current issue of BS7671 and any applicable local
regulations.
Connection of the boiler and system controls to the
mains supply must be through a common isolator
and must be fused 3A maximum. This method of
connection should be, preferably, an unswitched
shuttered socket outlet and 3 pin plug, both to the
current issue of BS1363.
Alternatively, a double pole isolating switch may be
used, provided it has a minimum contact separation
of 3mm in both poles. The isolator should be
clearly marked showing its purpose. See also
Section 6, Electrical Connection and System
Controls.
Wiring to the boiler must be to the current issue of
BS6500 Table 16, not less than 0.75mm
2
(24/
0.20mm).
The boiler is provided with a draining tap at the
lower right hand side for draining the heat
exchanger in the event of the boiler being out of use
during freezing conditions.
A draining tap must also be provided at the lowest
points of the system which will allow the entire
system and hot water cylinder to be drained.
Draining taps shall be to the current issue of
BS2879.
A safety valve need not be fitted to an open vented
system.
