Service Center Solahart (081313462267) water heater | Page 29

33-1197 Solahart Owner‟s Manual – Thermosiphon Systems - Revision H – Nov 2013

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INSTALLATIONS INCLUDING TEMPERATURE LIMITING DEVICES

In the event of the collectors stagnating and generating steam, it is possible that high temperature water may by-pass the
temperature limiting device. To prevent this from occurring please follow the connection details shown below.

Where a temperature limiting device is installed adjacent to the solar water heater, the cold water line to the temperature
limiting device can be branched off the cold water line either before or after the isolation valve and pressure limiting valve
to the solar storage tank, but it MUST BE before the non return valve prior to an open circuit direct system. The cold water
line to the temperature limiting device can be branched off the cold water line either before or after the non return valve
prior to a closed circuit indirect system. If an expansion control valve is required, it must always be installed after the non
return valve and be the last valve prior to the solar storage tank.

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WARNING: A NON RETURN VALVE MUST BE INSTALLED ON THE COLD WATER LINE TO THE SOLAR
STORAGE TANK AFTER THE COLD WATER BRANCH TO A TEMPERATURE LIMITING DEVICE PRIOR TO
AN OPEN CIRCUIT DIRECT SYSTEM.

If a combination isolation valve and non return valve (duo or trio valve) is installed on the cold water line to the solar water
heater and the cold water line to the temperature limiting device branches off after this valve prior to an open circuit direct
system, then a second non return valve must be installed between the cold water branch and the solar storage tank.
If a pressure limiting valve is installed on the cold water line to the solar water heater and the cold water line to a
temperature limiting device branches off before this valve or from another cold water line in the premises, then a pressure
limiting valve of an equal pressure setting may be required prior to the temperature limiting device (refer to the temperature
limiting device‟s installation manual for detail of acceptable pressure differentials).
FILLING AND COMMISSIONING THE STORAGE TANK AND COLLECTORS

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WARNING: DO NOT TURN ON ELECTRIC POWER UNTIL AFTER THE WATER HEATER HAS BEEN FILLED
WITH WATER.

Turn on a least one hot water outlet tap, preferably over a bath or laundry basin. Open the mains water supply valve on the
line to the water heater to allow water to fill the storage cylinder and collectors, dispelling air out of the top of the cylinder
through the open tap. As soon as water flows freely (without air bursts) from the tap, close the tap and allow the cylinder to
pressurise. Check all joints for water tightness.
Turn ON the electric power to the booster element ensuring that the power is correctly connected i.e. „Active‟ line to
„Active‟ terminal etc.
Operate the easing lever on both pressure relief valves to ensure that the valves are functional. The system tank is now
filled and ready to operate.
Remove the solar collector packaging. This must be removed completely prior to the permanent operation of the water
heater.