34
Cylinders are cooled during the night.
Does the solar pump run during the night?
Check the controllers’
settings. Rever t to
default settings.
Is collector temperature higher at night than ambient?
Check the non return
valves in the system are
working correctly.
NO
YES
NO
YES
Is the cylinder and all pipework in the system
correctly insulated?
Insulate cylinder, all
pipework and
connections.
NO
YES
Does the flow from the cylinder have too much rise?
NO
YES
Change pipe
arrangement.
Does warm water circulation run for a very long
time?
Switch Off the solar pump and the non-return valve
for 1 night.
Does cylinder still lose heat?
NO
YES
Use circulating pump
with timer.
YES
NO
Check non-return
valve.
Does the system have high gravitation (head)?
YES
NO
A
B
A
B
Has the Auxiliary heat source got a motorised valve
adjacent to the cylinder, preventing heat loss?
NO
YES
Fit motorised valve.
Check function of the
valve; only open when
auxiliary heating is On.
The gravitation (head) of
the system may too
high.
Fit stronger non-return
valve.
Or fit electrical two way
valve between the pump
and the cylinder, wired
with pump (R1) when
pump is On valve is
open.
Is the pump on the auxillary heating circuit running
whilst auxiliary heating is Off?
YES
NO
Check auxiliary
controlling factors and
reset to only run when
auxiliary heating is On.
