3
System Maintenance
Envirosun AS Installation Manual Rev1a PVNW.docx
Page 9
3.4
Relief valves
The lever on the relief valves should be operated at least every six months. Failure to do
so may result in failure of the tank. If water does not discharge freely from the valves
they should be checked and possibly replaced. The relief valves and relief valve drain
lines must not be blocked. Some water may discharge during each heating cycle
Every five year’s all safety valves should be replaced to ensure continued life and
operational safety of the system. In locations where the potable water has a Total
Dissolved Solids (TDS) of greater than 600 ppm it is recommended to replace all safety
valves every 3 years.