gledhill BM125 Installation And Servicing Instructions page 13

Pipe Sizing/Materials
The primary pipework connecting the boiler and the thermal store should be sized
to achieve a maximum of 8°C rise across the boiler or the maximum temperature
rise specifi ed by the boiler manufacturer, whichever is smaller, but in any instance it
should not be less than 22mm copper tube.
Note: There should be no valves in the pipework connecting the boiler to the
BoilerMate 2000.
The heating circuit operates on the normal primary boiler temperatures i.e. 82°C
fl ow and 71°C return. Therefore any traditional hot water radiators or convectors
can be used with this system and no special over-sizing of the heat emitters is
necessary.
All the recommendations with regard to pipework systems in this manual are
generally based on the use of BS/EN Standard copper pipework and fi ttings.
However, we are happy that plastic pipework systems can be used in place of
copper internally as long as the chosen system is recommended for use on domestic
heating systems by the manufacturer and is installed fully in accordance with
their recommendations. We always recommend the use of barrier pipe for these
systems.
Primary flow
Primary return
Boiler
F & E Cistern
BM 2000
Page 13
1.0 DESIGN
1.3 SYSTEM DETAILS
Heating System
It is also essential that if an alternative pipework
material/system is chosen the manufacturer
confirms that the design criteria of the new
system is at least equivalent to the use of BS/EN
Standard copper pipework and fi ttings.
Boiler Size
It is only necessary to calculate the heating
requirements in accordance with BS 5449. The
allowances shown below should be added
for domestic hot water. The control system
automatically gives priority to hot water when
necessary.
l A o l w a n e c f r o D o m e t s
W t a r e
M o d l e k (
B M 1 5 2
B M 1 5 4
B M 1 5 8
B M 2 0 1 3
B M 2 5 2
Boiler Sited Below BoilerMate 2000
Any boiler can be used when the flow pipe
from the boiler to the BoilerMate 2000 rises
continuously. No valve shall be fi tted in the
primary fl ow or open vent.
c i H t o
W )
2
3
3
5 .
4