VELUX solar system components – Part 3: Solar water heater system installation – 11
4. Pump station controller: Operational control center for VELUX solar
systems. All solar loop system safety devices, temperature gauges,
pressure gauges, fi ll valves and drain valves are housed within or
attached to the pump station controller. Consists of the following
components:
a. Solar controller: The solar controller, turns on or off solar loop circulator
depending on the heat gained in the solar collectors. The controller will
also limit over heating in the solar collectors and overheating in the solar
storage tank.
b. Tank and heat exchanger temperature and pressure and gauges: The
temperature and pressure gauges in the pump station controller will
show the user the actual temperature and pressure being supply and
returned to the solar collector and through the heat exchanger.
c. Check valves: Check valves located in the “hot” and “cold” lines of pump
station controller help minimize the convective heat loss at night when
the system is not operating. If check valves are not installed, most of
the heated energy stored during the day would be transferred back up
into the collectors and lost.
d. Collector array isolation valves: Valves located in the “hot” and “cold”
lines of pump station controller are used to isolate the solar collector
loop from the solar storage
tank.
e. Pressure relief valve (for
solar loop): Will release the
pressure in the solar loop when
it exceeds 82 PSI. If the valve
opens and releases fl uids,
than it is recommend that
you contact your contractor
immediately.
f. System fi ll valve: Used to fi ll the
system with heat transfer fl uid
and also eliminate air from the
system.
g. System drain valve: Used to
charge the collector loop with
propylene glycol, purge air from
loop and drain the solar water
heating system of heat transfer
fl uid.
h. Circulator: Circulates the heat
transfer fl uid from the solar
collectors into the solar storage
tank heat exchanger.
i. Ball valve (for circulator): Used
to isolate the circulator pump
for service and when fi lling the
system with heat transfer fl uid.
Pump station controller
Inside a pump station
controller
a.
e.
f.
h.
g.
i.
b. c. d.