6
2000225013B
FAN
AUTOMATIC
AIR VENT
EXPANSION
VESSEL
BURNER
HEAT EXCHANGER
PUMP
GAS
CONTROL
VALVE
DISCHARGE
OVERHEAT
CUT-OFF
RETURN
THERMISTOR
FLOW
THERMISTOR
BYPASS
C.H. INLET
FILTER
C.H.
FLOW
C.H.
RETURN
GAS
SAFETY
VALVE
DRAIN
TAP
1 General Information
Diagram 1.3
10155
Diagram 1.2
10130
SCHEMATIC LAYOUT OF BOILER
1.3 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 above standard.
1.4 Technical Data
All dimensions are given in millimetres (except as noted).
See diagram 1.1 and Tables 1 and 2.
The data label is positioned on the inner door, refer to
diagram 1.2.
The Seasonal Efficiency Domestic Boilers UK (SEDBUK) is:
30 sxi: Class ‘A’.
The value is used in the UK Government's Standard Assessment
Procedure (SAP) for energy rating of dwellings. The test data
from which it has been calculated has been certified by B.S.I.
1.5 Electrical Supply
The boiler must be earthed.
All system components shall be of an approved type and all
wiring to current I.E.E. wiring regulations.
The boiler must be connected to a permanent 230V ac, 50Hz
supply.
Connection of the whole electrical system of the boiler, including
any heating controls, to the electrical supply must be through
one isolator.
Isolation should be by a double pole switched fused spur box,
with a minimum gap of 3mm for both poles. The fused spur box
should be readily accessible and preferably adjacent to the
appliance. It should be identified as to its use.
