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"Home Warm" Almost the same system as a Y Plan (Not recommended)
This system was a
low cost version of the Y Plan, except a Primatic cylinder is used and the pump
is on the return. (Using a Primatic cylinder is not recommended on a fully
pumped system)
"S Plan"Probably the most versatile
system.
With this system
you can have as many zones as you like, but each zone must have its own valve
and thermostat. A popular way is to have 4 valves, 1 for the hot water, 1 for
upstairs,1 for downstairs and 1 for say, the conservatory.
When the clock
calls for heat at the required time it sends a signal to one or more of the
thermostats. If in turn the thermostat is calling for heat, then power is sent
to the zone valve it controls and drives the motor open. When it is fully open a
micro switch is made, which turns on the boiler and pump. Once the thermostat
reaches temperature the power is turned off to the zone valve which springs
shut. The micro switch brakes and so power is cut off to the boiler. (providing
another zone is not open) Note, if there is a “Pump over run” on the boiler then a by-pass must be
fitted.
Very economical
to run dependent on which boiler is fitted (ideal for use with any type of
boiler, even a combination boiler)
Possible
problems
No heating but Hw
OK- this is usually the motor that needs replacing
within the Heating Motorised valve
No Hw but heating
OK- this is usually the motor that needs replacing
within the HW Motorised valve
No heat or Hw- probably the pump needs replacing
System sluggish &
expansion tank getting hot- Cold feed blocked and
possibly not piped up correctly, to check for a blockage use a magnet and touch
it to the copper pipes, if the is an attraction then there is sludge inside the
pipes, this is caused by either not being flushed out properly when new or the
cold feed and expansion pipes are not configured correctly, this also causes
radiators to leak but will take a few years to corrode through completely
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