Connection to Boilers and Heaters
Where boilers incorporate a high limit cut out thermostat, pump overrun
device, and have connections outside the boiler casing 350mm from the
heat source, direct connection can be made to Hep2O®.
Typically these boilers contain a copper heat
exchanger and are low water content boilers.
Where any one of the above criteria for direct
connection to a boiler cannot be met a
minimum one metre run of copper pipe
should be installed between the boiler and
the start of the Hep2O® system.
In all cases (including instantaneous water
heaters, caravan heaters etc.) care should be taken
to ensure that appliances have the appropriate
thermostatic controls and cut outs to ensure that operating conditions do
not exceed the temperature and pressure limits laid down for Class S
pipe (see Table No. 1, page 3). For any type of back boiler all water
connections should be extended from the appliance to the outside of
the fireplace opening in copper tube.
In these instances, where the heat output may be uncontrolled, a
minimum one metre run of copper pipe should be used between the
boiler and the start of the Hep2O® system.
Any gravity circuit of a solid fuel boiler should always be installed in
copper.
Regulations require that metal pipe be used as discharge pipe from
temperature/pressure relief valves on unvented water heaters, to or from a
tundish or from safety valves on sealed central heating systems. On sealed
systems where the safety valve is not provided within the boiler casing, the
pipe between the safety valve and the boiler should be in copper.
All boiler connections should be made in accordance with the
requirements of BS 5955, Part 8.
.
.
.
Short exposure to temperatures up
to 100ºC resulting from
thermostat/system malfunction will
not cause failure, but may shorten
the long term design life of the
system.
Thermal cycling
Thermal cycling - the rise and fall in
water temperature during normal
operation - also induces different
and additional stresses on pipes and
joints.
