6
221460C
1 General Data
1.6 B.S.I. Certification
This boiler is certificated to the current issue of BS6332 Part 1,
invoking the current issue of BS5258 Part for performance and
safety. It is, therefore, important that no alteration is made to
boiler without permission, in writing, from Hepworth Heating
Ltd.
Any alteration that is not approved by Hepworth Heating Ltd.,
could invalidate the B.S.I., certification of the boiler, the warranty
and could also infringe the current issue of the Statutory
1.7 Gas Supply
The gas installation must 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 current issue of BS6891.
1.8 Electrical Supply
WARNING. This boiler must be earthed.
All system components shall be of the approved type and be
wired and connected in accordance with requirements 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 by a fused
double pole isolating switch, which has a minimum contact
separation of 3mm on both poles. This switch should be readily
accessible and preferably adjacent to the appliance. It should
supply the appliance only and be easily identifiable as so doing.
Wiring to the boiler must be insulated PVC flexible type to the
current issue of BS6500 Table 16, not less than 0.75mm
2
(24/
0.20mm).
1.9 Draining Tap
A draining tap must be provided at the lowest points of the
system which will allow the entire system, boiler and domestic
hot water cylinder to be drained.
Draining taps shall be to the current issue of BS2879.
1.10 Safety Valve
A safety valve need not be fitted to an open vented system.
1.11 Clearances
The boiler position should be such that the clearances shown in
diagram 1.2 are achieved.
Additional clearances may be required for installation.
If fixtures are positioned next to the boiler they should be made
removable for access to pipework.
Sufficient clearance must be left in front of the boiler for
servicing.
The casing side grilles must be kept clear at all times.
The boiler must be mounted on a flat wall which is sufficiently
robust to take its weight.
A L.H. and R.H. side of casing
25
B Top of casing
75
C Bottom of casing
150
D Front of boiler (from a
permanent surface)
305
Minimum Clearances
from Walls, Ceiling,
Floor, Cupboard, Worktops etc.
Diagram 1.2
BOILER FIXING DIMENSIONS
AND MINIMUM CLEARANCES
B
518
232
200
200
C
A
46
300
Boiler
Outline
Minimum
clearance
limit
0003M
1.12 Timber Frame Buildings
If the boiler is to be installed in a timber frame building it should
be fitted in accordance with the Institute of Gas Engineers
document IGE/UP/7/1998. If in doubt seek advice from the local
gas undertaking or Hepworth Heating Ltd.
1.13 Heating System Controls
The heating system should have installed: a programmer and
room thermostat controlling the boiler.
Thermostatic radiator valves may be installed in addition to the
room thermostat.
Note: For further information, see The Building Regulations
1991 - Conservation of fuel and power, 1995 edition - Appendix
G, table 4b.