Ozroll OZS251E, Installation Manual

Disconnect the long sensor lead at the system controller. Apply power to the system. After 10 to 12 seconds the 
control output relay should click and switch the pump on. It can be difficult to detect if  the pump is running, it 
can run quietly and with little vibration. There is a green light on the pump that illuminates when the pump is 
powered, but this is difficult to see. 

If  there is sufficient sun,  hot water will be circulated back to the tank when the pump is running, check the 
return line from the collector with caution, it may be very hot.

Remove power and reconnect long sensor lead after test.
Seal sensors in their sockets and secure wiring. The installation is now complete. 
Show the customer the control system and then replace the control box cover. Secure the cover with self  tap-
ping screws with star washers.

Install the heater booster element and thermostat securely using the rubber flange provided for a water tight 
seal. 

Connect the wiring after confirming that the electrical circuit is isolated.

WARNING – ENSURE ELECTRICAL CIRCUIT IS ISOLATED BEFORE CONNECTING ANY ELECTRICAL WIRING

Open some convenient hot taps in the house and then open the cold water valve to allow the cylinder to fill.

When air free water is discharging from the taps and NRV then close them and allow the pressure in the cylinder 
to stabilise. 

Check for leaks throughout the system and correct as required

H13. COMMISSIONING THE SYSTEM

• Follow the procedures for installation of  the storage tank, the solar collectors and the system controller / 
pump assembly

• Ensure all valves and connections in the system are secure. 

• Turn the cold water ON so that the storage cylinder fills and ensure the cap on the automatic air vent is OPEN 
(approx. 1½ turns) during the filling process to ensure the panels are completely vented of  air. Ensure there is 
no air 

• When no more air is escaping from the vent then the system is full. The cap on the air valve should then be 
CLOSED.

• the TPR (temperature pressure relief) valve should be checked and operated to release air.

• hot water taps within the house should be turned on until water free of  air bubbles is delivered.

• any taps with strainers or aerators on their outlets should have the strainers/aerators taken off  and cleaned 
to remove any swarf  or other debris that has got into the system during installation.

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