Sirius FS
23
GB/IE
5.0 INSTALLATION
5.1 WATER CONNECTIONS TO LOW TEMPERATURE CIRCUITS.
5.1.1 Flow and Return Connections
The flow and return feeds are identified on top of the boiler. Connect the system flow and
return pipes to these outlets using appropriate flanged fittings
(see section 3.2 for details)
using an appropriate gasket between each flanged connection.
5.1.2 Safety Relief Valve and Expansion Vessel
In the case of open vented heating systems, connect the safety header pipe and return pipe.
In the case of sealed heating systems, install an expansion vessel and a temperature and
pressure safety valve.
Any expansion vessel must be designed to withstand temperatures of the heating system
(vessels will typically be coloured red or white) and sized to allow expansion of the entire
system water to which the boiler is connected. As an example, water being heated from
0°C-100°C will increase in volume by approximately 4.5%.
It is advised that the 1 ½” BSP threaded outlets provided on the boiler flow pipe are
used for the fitting of the safety valve.
5.2 CONDENSE CONNECTIONS
Condensation is formed in the normal operation of the boiler and this must be continuously
discharged into a drain. Given the acidity level of condense discharge (pH 3.5 - 4.5) only
plastic material can be used for the discharge pipe work. This pipe should be no less than
40mm diameter with a drop of at least 30mm for every metre of pipe work should be used.
A syphon trap is supplied which should be connected into a drain via a tundish or air break.
External pipe work and that passing through a wall to the outside should be run in a
minimum of 40mm diameter. External pipe work should be insulated to protect against frost
and freezing temperatures.
The condensate trap must be filled with water before operating the boiler
It is important that the condensate flow must be maintained, even in freezing
conditions. In the event that the condensate becomes blocked, the boiler will
shutdown and not operate normally again until the flow has been restored.
