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Operation
Warning: iF THE OuTDOOr TEMPEra-
TurE iS EXPECTED TO DrOP BELOW THE
raTED TEMPEraTurE rangE OF THE
HEaT TranSFEr LiQuiD, Drain THE HEaT
TranSFEr LiQuiD OuT OF THE SYSTEM
unTiL THE THrEaT iS nO LOngEr PrES-
EnT.
Solar Collectors
There is no specific operator action required.
Piping
There is no specific operator action required.
Pumping Station - Solar Loop-a
Warning: CHECK THAT ALL VALVES ARE
oRIEnTED In THE AppRopRIATE DIREC-
TIon BEFoRE STARTInG THESE InSTRuC-
TIonS. SEE FIGuRES 18 & 19.
Warning: This system is designed to be used
with polypropylene Glycol as a heat transfer
liquid. Substitution of any other heat-transfer
fluid can cause irreparable damage and create
a health and safety hazard.
Warning: The housing of the motor and any
uninsulated piping will be hot during operation.
To avoid burns, do not let bare skin touch hot
surfaces.
The circulation pumps on the Solar pumping Sta-
tion and the HXA pumping Station are controlled
by the comparison of temperatures of the tem-
perature probe in the Solar Storage Tank and the
temperature probe at Solar Collectors. The Solar
Controller turns the pumps on and off and adjusts
the speed, of both, to maximize the efficiency of
the system and the result is a totally automated
system where periodic monitoring is all that is
required.
The Solar Controller will display the symbol
indicating that the pumps are on.
CauTiOn: Both pumps should be running at
the same time, if only one pump is running discon-
nect power to the system and troubleshoot the
issue.
All manuals and user guides at all-guides.com
,
!
nOTE: In general a lower flow rate will result in
a higher heat transfer rate throughout the system,
leading to higher temperatures.
•
Pressure relief Valve
The pumping station is equipped with a pres-
sure relief valve. The activation pressure of the
pressure relief valve is 87 psi (6 bar).
Although the valve is set for 87 psi (6 bar) as the
pressure release, the normal operation of the
unit will be 58 psi (4 bar).
Warning: The supplied pressure relief
valve must be permanently installed at the in-
tended position of the solar pumping station.
•
Check Valves
When the system is not operating, the Check
Valves in the pumping station prevent the un-
controlled circulation of the heat transfer medi-
um. They are located in the Shut-off Ball Valves
in the supply and the return lines in each pump-
ing station.
CauTiOn: The shut-off ball valves must only
be activated by trained operators. Failure to ob-
serve the flow direction can result in the check
valve working against the intended flow direction
and, as a result, blocking the flow and possibly
damaging the system.
They should only be opened manually (Figure
18) by adjusting the ball valves 45° clockwise,
from the open operating position, for filling and
draining the system or closed for maintenance
to prevent any flow of solution.
•
Flow Meter
The pumping station is equipped with a rotame-
ter to monitor the flow through the unit. The
Solar Controller varies the speed of the pumps
to maximize the heat transfer through the sys-
tem. As a result the flow meter will typically read
between 0.7gpm and 1.2 gpm.
The flow rate of the Solar Heating Water System
varies to optimize the energy gain from the solar
collector into the cylinder. However, should the
flow meter on the solar pumping station indicate
a flow outside that range, the troubleshooting
guide should be consulted as a malfunction ex-
27
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