29
BOILER WATER CONNECTIONS
The boiler ow and return pipes are
terminated with a 1
1
/
4
” BSP male taper
connection located at the bottom of the
appliance.
Note. This appliance is NOT suitable for use
with a direct hot water cylinder.
Plastic plugs tted into the open ends of
the ow and return pipes must be removed
before connecting the system pipework.
30
FROST PROTECTION
The boiler has built into its control system the facility to protect
the boiler only against freezing.
If the boiler ow temperature T
1
, falls below 5
o
C the pump and
burner run until the temperature exceeds 19
o
C.
Central heating systems tted wholly inside the building do
not normally require frost protections as the building acts as
a ‘storage heater’ and can normally be left at least 24 hours
without frost damage. However, if parts of the pipework run
outside the building or if the boiler will be left off for more
than a day or so, then a frost thermostat should be wired
into the system, see Frame 49.
INSTALLATION
31
GAS CONNECTION
Refer to Frame 1 for details of the position of the
gas connection.
A MINIMUM working gas pressure of 17.5 mbar
(7” w.g.) must be available at the boiler inlet for
natural gas and 37mbar for propane with the
boiler ring. Refer to Frame 58 for details of the
pressure test point position.
Extend a gas supply pipe NOT LESS THAN 22mm
O.D. to the boiler and connect using the gas cock
provided.
IMPORTANT. The gas service cock contains a
non-metallic seal so must not be overheated when
making capillary connections.
The pressure loss for LPG versions is negligible due to the very low
velocity through the pipe work.
Note. It should be noted that this pressure drop is present within the
internal boiler pipe work and is irrespective of the fact that manifold
headers are used. This pressure drop will be experienced on each
individual boiler regardless of single or multiple installation.
In order to determine the actual working gas pressure at the
boiler inlet the gure from the table below must be added to the
measured pressure (refer to Frame 58).
Gas Line Pressure Drop
(Natural Gas)
Boiler Model mbar
40 0.4
60 0.9
80 1.6
100 2.5
120 3.6
150 5.6
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