Glow-worm Clearly Solar System Hydraulics - Manual (Page 22)

22
8 Fault Finding
The following tables provide information on possible
malfunctions during the operation of the solar system as well
as their cause and remedy.
All work on the Glow-worm solar system (installation,
maintenance, repairs etc.) may be performed only by
approved specialists.
IMPORTANT: Risk of serious injury or death! Never try to
correct faults in the solar system yourself. Bear in mind
that you risk death or serious injury if the work is performed
incorrectly. Consult an approved qualified servicing company
in the event of malfunctions.
NOTE: Only use original spare parts from Glow-worm. for the
replacement of parts. We recommend making a maintenance
agreement.
Malfunction Cause Remedy
Solar pump
Pump is not running although the
collector is warmer than the cylinder
(neither motor noises can be heard nor
vibrations felt).
1. No current available. Check the power cables and fuses.
2.Temperature difference set too high or
controller is not switching.
Check the controller.
Check the temperature sensor.
Reduce the temperature difference.
3. Maximum temperature reached.
4. Pump shaft jammed by deposits in the
bearings.
Switch temporarily to max. speed or
unblock the rotor, insert a screwdriver in
the notch and turn it by hand.
5. Pump dirty. Dismantle the pump and clean it. Close
the flow rate meter and pump ball valve.
6. Pump defective. Replace the pump.
7. Flow rate set incorrectly Check the setting and adjust it if
necessary.
Pump is running, but no solar fluid
is coming from the collector (pump
gets hot). Forward and return flow
temperatures are the same or the storage
tank temperature not increasing at all or
only slowly.
Air is in the pipework. Check the system pressure. Operate the
pump intermittently at maximum power.
Open the bleeder at the pump and at the
cylinder and bleed. Bleed the back flow
prohibition. If there is no improvement,
check whether there is a “u pocket”
anywhere in the piping (e. g. at beam
projections or at the bend of water pipes).
Change the pipework or install additional
air vents. If the system has already been
started up and is refilled again, check
the automatic air vent: Unscrew the
protective cap and check the floater for
mobility with a blunt needle. If the floater
is jammed, replace the air vent.
Pump goes on too late and stops running
early.
1. The temperature difference between
the collector and cylinder has been set
too high.
Reduce the temperature difference.
2. Collector connection pieces not
insulated (tube collector).
Insulate the collector connection pieces.
Pump starts up and goes off shortly
afterwards. This is repeated several times
until the system runs its course. The
same occurs in the evening.
The temperature difference of the
controller is too low or the pump speed is
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
difference of the controller.
The pump is making noises. 1. Air in the pump Bleed the pump.
2. Insufficient system pressure. Increase the system pressure.
Solar system
Clocking of the system.
Incorrect position of the collector sensor. Position the collector sensor in the flow.
Insulate the collector sensor.
Table 8.1 Fault Finding