Manual 02 - Section 10








Non-Residential Solar Information Manual
SECTION 10: Fault Finding & Service

10.1 INSUFFICIENT HOT WATER SOLAR INPUT

The following check list should be used as a guide to establish the reasons for the complaint:

When all items above have been checked and proven to be correct, check the hot water usage rate. Place a water meter in the cold potable water line to the solar package and record the water consumption over a representative period.

10.2 DRAW OFF TEST

A draw off test should be preformed once all functions have been fully tested and proven to be correct. To ensure that performance is proven this test must be conducted with the customer present and in possession of the anticipated results. Use the graphs in previous sections to demonstrate the expected results.

Turn off the cold water supply to the solar package. Allow one clear day's automatic energy collection without potable water usage from the solar package.

Connect a water meter to the cold potable water inlet pipe and draw off the entire hot water content of the package.

The hot water outlet temperature obtained should be approximately twice the daily maximum ambient temperature and remain within a 120 C band until the rated capacity of the package has been reached.

10.3 INSUFFICIENT HOT WATER ON ELECTRIC BOOST

The following check list should be used as a guide to establish the reasons for the complaint:

If all the above points are shown to be operating correctly a draw off test should be carried out using electric boosting alone. Allow one full day cycle for off peak boosting or a 5 hour period for continuous boosting and measure the output performance as detailed in the segment on Draw Off Tests.

10.4 INSUFFICIENT HOT WATER ON GAS BOOST

The following check list should be used as a guide to establish the reasons for the complaint:

If all the above points have been confirmed to be operating correctly a draw off test should be carried out using gas boosting alone. Allow a 5 hour period for continuous boosting and measure the output performance as detailed in the segment on Draw Off Tests.

10.5 WATER LEAK FROM COLD RELIEF VALVE

Under normal conditions this valve will release water pressure from the system as the potable water temperature rises. After the solar pump and any booster devices have been off for some time and the pressure stabilised, the discharge from the valve should stop. If this does not happen the valve seat should be checked for obstructions. To flush out the valve assembly raise the lever located on top of the valve and allow the water to flow freely for a few seconds to clear the seat.

If the leakage continues check the pressure within the system to confirm that the other control devices or plumbing connections in the circuit are correct and take the actions as found to be appropriate to reduce the systems internal pressure.

10.6 INSUFFICIENT PRESSURE

The following check list should be used as a guide to establish the reasons for the complaint:

10.7 CLOSED CIRCUIT RELIEF VALVE DISCHARGING

After commissioning has been completed and the closed circuit stabilised, discharge from this valve should stop. Continual discharge indicates a leakage between the potable water vessels and the closed circuit reservoir.

10.8 POTABLE WATER STORAGE VESSEL REPAIR

To repair the system the following procedure can be used:

The following check list should be used as a guide to locate the leaking vessel:

Note: The closed circuit system contains a corrosion inhibitor. Although it is non-toxic, the solution, particularly when hot, should not be drained onto lawns, gardens etc., but directly into a floor waste.

The following check list should be used as a guide for the removal and replacement of a potable water storage vessel:

10.10 SERVICE CONTRACTS

Where possible service contracts should form part of the sales package to ensure the continued efficient operation of the system.

The service contract should include inspection of the following items: