Vision TZ58/1800-10 Installation, Operation And Maintenance Manual page 20

Vision Solar Systems - 100 L Gravity Fed Type
First Filling with Water and Commissioning
Do not fill any tubes with cold water if they have been

exposed to the sun. The sudden contraction will cause them
to fracture.
Two methods can be used for the first filling of the tank.
Method 1 – Filling while inserting the tubes;
In this method the installation of the system needs to be complete with all the plumbing connections
made except for the vacuum tubes.
 Open the inlet supply valve and allow the water to fill the tank up to the holes for the
vacuum tubes. Adjust the water so that it just trickles out of the tube holes.
 Check that the water contains no gritty deposits. (If this is the case, Enervision recommends
the fitting of a filter trap and implementation of a regular maintenance procedure to clean
the filters).
Prepare the first tube for fitting with the dust cover and soapy lubrication.

 Insert the tube into the hole and then secure into the tailstock.
Continue with the next tube, all the time ensuring that the tubes immediately start filling

with water once they are fitted.
 Once all the tubes are fitted open the inlet valve completely and allow the tank to fill via the
ball valve and reservoir tank.
 Check that the ball valve closes once the tank is full and that no water is discharged from the
overflow.
Check all installed pipework to ensure that there are no leaks.

 Open the drain and drain off 10 litres of water into a clean bucket. Check for any gritty
deposits and that the ball valve closes again. Repeat if necessary.
 Switch timer into the override mode and switch on the isolator.
Monitor the current on the electrical element with a tong tester. (Do not confirm with

voltage measurements.).
 The system is now ready for use and will require time to heat.
See performance information on page 11 to gauge the time it will take to heat the water

sufficiently.
Method 2 – Filling with the tubes fitted
In this method the installation of the system is complete including the vacuum tubes.
If the tubes have been exposed to the sun for an extended period, wait until the early

morning before filling the system.
 If the tubes are fitted in the evening, less than 1 hour from sunset, the system can be filled.
 Open the inlet valve completely and allow the tank to fill via the ball valve and the reservoir
tank.
 Check that the ball valve closes once the tank is full and no water is discharged from the
overflow.
 Check all installed pipe work to ensure that there are no leaks.
Open the drain and drain off 10 litres of water into a clean bucket. Check for any gritty

deposits and that the ball valve closes again. Repeat if necessary.
 Switch timer into the override mode and switch on the isolator.
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Issue 2.0 Mar 2013
20