Instructions on commissioning, maintenance, and troubleshooting for auroSTOR 0020111119_02
63
Fault Cause
Remedy
The solar pump starts up and switches off
again shortly afterwards. This is repeated
several times until the system runs its
course. The same occurs in the evening.
The controller temperature difference is too
small or the pump speed has been set too
high. The solar radiation is not yet sufficient
to heat up the entire pipework.
Check whether the entire pipework is fully
insulated. Increase the temperature differ-
ence of the controller.
The solar pump is making noises.
1. There is air in the solar pump.
Vent the solar pump.
2. Insufficient system pressure.
Increase the system pressure.
Solar heating system
Clocking of the system.
Incorrect position of the collector sensor
Position the collector sensor in the flow.
Insulate the collector sensor.
The pressure gauge indicates a drop in pres-
sure.
Pressure loss is normal shortly after filling
the system, since air still escapes from the
system. If a drop in pressure occurs again
later on, it might be caused by an air bubble
which was released later. Furthermore, there
are fluctuations to the pressure in normal
operation mode between 0.2 to 0.3 bar,
depending on the system temperature. If the
pressure drops continuously, there is a leak
in the solar circuit, probably in the collector
array.
First check all screw connections, stuffing
boxes at gate valves and threaded connec-
tions, then the soldering points.
Check the collector array and replace a tube
or the collector if necessary.
The water pressure and amount of
discharged water decreases at hot water
draw-off points.
Pressure in the main cold water supply too
low.
Tell the operator to notify the water supplier.
Line strainer in the pressure reducing valve
dirty.
Clean the line strainer in the pressure reduc-
ing valve and replace it if necessary.
Pressure reducing valve faulty.
Replace the pressure reducing valve.
Blockage in the system.
Unblock the blockage and replace any
blocked parts.
Check the system to see if air is escaping
from the expansion relief valve and tempera-
ture/pressure relief valve.
The system is making noises. Normal for
the first few days after filling the system.
If it occurs later, there are two possible
causes:
1. System pressure is too low. The solar
pump is pulling in air via the air vent.
Increase the system pressure.
2. Pump output set too high.
Switch to a lower speed.
The solar yield is unusually low.
The pipe insulation is too thin or incorrect.
The system may have been designed incor-
rectly.
Check the insulation. Check the design of
the system (collector size, shading, pipe
length) and modify the system if necessary.
Solar controller
auroMATIC 560/2: display example
"KOL 1 Err" or similar
Faulty sensor (short circuit or interruption).
1. Test the cable connection.
2. Measure the resistance values of the dis-
connected sensor at known temperatures,
and compare these with the manufactur-
er's details.
3. Inspect the piping for damage.
Cylinder
The cylinder cools down at night.
After the solar pump is switched off, the
supply and return lines have different tem-
peratures. The collector temperature is
higher than the air temperature at night.
1. The non-return valve is blocked.
1. Check the position of the blue handle.
2. Check the non-return valve for tightness
(jammed cuttings, particles of dirt in the
sealing face).
3. Do not connect the solar heat exchanger
directly; instead, first pull the supply lines
downwards and then upwards to the col-
lector (the siphon supports the non-return
valve) or mount a two port valve which is
switched at the same time as the solar
pump.
2. One-pipe circulation in the case of short
tube networks with low pressure loss.
Install a non-return valve (as close as possi-
ble to the cylinder).
Tab. 9.1 Troubleshooting (continued)
Fault finding 9