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1. Operating instructions
1.1
Equipment description
The flat-plate collector converts light
(radiation) into heat. The light penetrates
the glass cover. It is made from pre-
stressed, highly transparent single pane
safety glass. The light strikes the absorber
and is converted into heat. The highly
selective vacuum coating of the absorber
and the thermal insulation on the back
of the absorber reduce heat losses to the
ambience to a minimum. The circulating
heat transfer medium is pumped to the
DHW cylinder, thus transferring the energy
generated by the collector in the form of heat.
Under certain operating conditions (e.g.
large DHW cylinder with low temperature
compared to the environment, or high
atmospheric humidity), the inside of the
collector may mist up. Vent plugs are
provided at the collector sides for venting
purposes.
1.2
Maintenance and care
The solar heating system should be
inspected annually by the local contractor
to ensure that the system, including the
safety equipment and cylinder, functions
properly.
1.4
What to do if . . .
fault
Fault/error message at the control unit. System fault; sensor faulty or incorrectly
Pressure fluctuations in the system.
Collectors mist up.
The pump does not run, even though
the collector is warmer than the
cylinder (neither motor noise nor
vibrations are discernible).
for users and contractors
The parts of the system exposed to the
weather must also be checked to ensure that
they are in acceptable condition (mounting
fixtures, thermal insulation, dirt, etc.).
Every year the local contractor must check
the pH value (> 7) of the heat transfer
medium and ensure that it is protected
against frost (-- 30 °C), and changed, if
necessary, or topped up with H - 30 L or
H - 30 LS via the filler inlet in the SOKI.
If the heat transfer medium needs to be
drained to carry out maintenance or repair
work, this work must be carried out by a
qualified contractor.
During such operations, cover the collectors
with opaque material.
Cleaning
Generally, solar collectors require no
cleaning, as they are largely self-cleaning.
In case of severe contamination (e.g. dust
or avian excrement), the surface can be
cleaned with fresh water (not during strong
sunlight).
cause
connected.
Immediately after commissioning:
Air pockets in the solar circuit.
Moisture ingress during storage.
Maximum cylinder or collector temperature
exceeded. Indicator lamp or
display at the control unit activated.
No power.
Excessive temperature differential (>15 °C)
selected or the control unit does not work.
Pump shaft blocked.
Pump contaminated.
Sensor not OK or incorrectly installed.
1.3
Important information
System pressure
The pressure gauge in the SOKI's heat
transfer medium circuit should be checked
regularly. Display (set value): 3.5 to 4 bar
when the system is cold (less than 30 °C).
Notify your local contractor if actual values
differ from the set values.
Only top up with H - 30 L or H - 30 LS.
Shutting the equipment down
The solar heating system is designed so
that special measures are not required if
no hot water is drawn, even for a prolonged
period (e.g. during a summer holiday).
To prevent overheating, the control unit and
pump must not be switched off.
The heat transfer medium must not be
drained off by the system user when the
system is shut down.
All installation and assembly
!
work must be carried out by the
approved local contractor.
remedy
See the control unit installation and operating instructions.
Vent the system again.
The internal mist will evaporate after a few weeks in operation
by moisture progressively escaping through the integral
ventilation slots.
The control unit has shut down correctly and restarts again
automatically when the actual temperatures drop below their
selected maximum temperatures.
Check cables and fuses.
• Check control unit.
• Check temperature sensor.
• Reduce temperature differential.
Briefly switch over to max. speed or insert a screwdriver into
the slot and turn manually.
Dismantle and clean the pump. Close throughput limiter and
ball valve.
Check sensor position, installation and curves; collector sensor
must be fully inserted into the sensor well.
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