Central Heating 2 Pipe System Basics
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| Two Pipe System Hot water is pumped from the
boiler (usually 22mm) through one pipe (Heating Flow) to each radiator,
which then gives up its heat to the air and the cooled water is
pumped back to the boiler via a second pipe (Heating Return). Each radiator
has one pipe (15mm) connected into the flow and another into the
return, so each radiator has it own circuit. Not on this system 15mm
pipe should only be used were it is only feeding a maximum of 3
radiators or a maximum of 20,000 Btu's of heat output, most modern
domestic boilers do have 22mm, connections from the boiler
The
Expansion pipe must be one size lager then the cold feed pipe from
the expansion tank and connected into the system as close as possible
to each other and on the primary flow pipe between the boiler and
the pump
A standard domestic circulating pump can only satisfactorily feed
water to a maximum of twelve radiators because each radiator is
fitted in parallel. So if there are twelve radiators fitted, each
radiator will only receive approximately 8% of the available water
flow. All modern installations use the two pipe system, as all the
radiators warm up at the same time and all get to the same
temperature
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