Solex Roofing Installation Manual 40
Solex Energy Ltd +44(0)1305 837223 www.solexenergy.co.uk
The sensor for a pool heat exchanger should be located in the exchanger sensor pocket,
which should be on the cold pool water inlet side of the exchanger. If no pocket is
available, it may be mounted on the pipe as above.
The sensor wires only carry low voltage, and may be extended if necessary using
conventional 0.75mm
2
two core lighting flex and connector blocks.
Sensor faults – sensor line break or short is indicated on the controller (see below). The
correct sensor values are: 1000ohms@0
o
C / 1078@20
o
C / 1155@40
o
C / 1232@60
o
C
Systems inputting heat into a pumped circuit
Where the solar roof is required to input heat into a
pumped circuit
, for example a heat
exchanger in a pumped pool water circuit, or a flat plate exchanger in a heating circuit,
then generally a mains 2 way relay (SPDT) will need to be used to force on the
pumped
circuit
circulation pump. This must be wired so as to switch the pool or heating circulation
pump from external (e.g. boiler) control, to ON (live, from the same circuit), when the solar
roof is inputting heat.
Where the there is only one store, e.g. dedicated pool systems, then the relay should
switch on with the solar pump. To do this the relay coil should be connected to the solar
pump relay R1 on the controller. In addition where the controller varies the pump speed
(BS4 and above) then the minimum pump speed on the controller must be set at 100%.
Failure to set the minimum pump speed may result in a buzzing and malfunctioning relay.
Where there are two roof pumps controlled separately, then two relays must be used with
the contacts in series, so that either R1 or R2 can switch the
pumped circuit
pump on
independently, without reverse feeding the external control.
Where there are two stores, and the
pumped circuit
is the one switched in by a motorised
valve, then the relay can be operated by the power to the valve.
Where there are two stores, and the
pumped circuit
is the default store with the
motorised valve at rest, then two relays will need to be used as above, with one operated
by the solar pump R1, and one operated by power to the valve, but so when the valve is
powered it puts the pumped circuit pump back under external control.
Where there are two
pumped circuits
, then the circulation pump of each must be
individually forced on when the solar pump is running, AND that circuit is switched in.
Controller programming
These controllers have three buttons, LEFT and RIGHT to scroll through functions, and a
middle SET button to change a function. To set a parameter, scroll through LEFT or
RIGHT to find the correct place, press SET, use LEFT and RIGHT to adjust the value, and
then press SET.
