Boiler Water Connections; Frost Protection; Gas Connection - Keston Heat 45 Installation And Servicing Instructions

26 boileR WAteR ConneCtionS

The boiler flow and return pipes are terminated with 1
connections located at the bottom of the appliance.
note. This appliance is NOT suitable for use with a direct hot water
cylinder.
Plastic plugs fitted into the open ends of the flow and return pipes
must be removed before connecting the system pipework.
Upon installation a tee connection, isolation valve and safety relief
valve/drain point must be fitted to the boiler flow/return connection
respectively. (See image opposite). This hardware is provided within
the boiler carton. This allows isolation for the water connections in
the event of servicing the water circulation pump fitted within the
boiler casing.
iMPoRtAnt: Correct fitment of the safety pressure relief valve
must be made to protect the boiler in the event of inadvertent
operation when isolated.

27 fRoSt PRoteCtion

The Keston Heat boiler has built into its control system the
facility to protect the boiler only against freezing.
If the boiler flow temperature T
burner run until the temperature exceeds 19

28 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 with the boiler firing. 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.
26
iNSTALLATiON
/ " BSP male
1
4
, falls below 5 C the pump and
o
1
C.
o
Tee
(supplied)
Isolation
Valve
(supplied) (supplied)
Central heating systems fitted 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 47.
In order to determine the actual working gas pressure at the
boiler inlet the figure from the table below must be added to the
measured pressure (refer to Frame 56).
Keston Heat Gas line Pressure drop
(Natural Gas)
Boiler Model
45/55
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.
Keston Heat -
Safety Drain
Isolation
Valve Point Valve
(supplied) (supplied)
mbar
1.6
Installation & Servicing
Tee
(supplied)