3
System Maintenance
Envirosun AS Installation Manual Rev1a PVNW.docx
Page 8
3
S
YSTEM
M
AINTENANCE
The Conergy solar water heater is designed so that there is little to do in the way of
system maintenance.
Personally inspecting or servicing any part of the system is not recommended.
Should you decide that you want to inspect the roof mounted collectors, it is essential that
you use all safety devices required to ensure your personal safety. Most importantly the
electricity supply must be turned OFF.
3.1
Draining and flushing the system
The system must be completely drained of water before any plumbing work is
commenced. This will prevent damage to the storage tank in the event of a vacuum or
excessive pressure forming at the storage tank.
The Conergy AS hot water system
should be drained and flushed every five years during
a major service of the unit.
1.
Turn off and isolate the power supply to the electrical element.
2.
Turn off the water supply to the water heater.
3.
Release excess pressure from the tank by manually opening the pressure &
temperature relief valve.
4.
Disconnect the cold water supply pipe connection to the tank.
5.
Fit a ½” flexible drain pipe to the cold connection at the tank. Place the open end
of the drain hose in a location where it is safe for the hot water to drain away from
the tank.
6.
Manually open the pressure & temperature relief valve which will allow air into the
tank and the water within the tank will flow out via the flexible drain pipe fitted to
the cold inlet connection. Hold the valve open until the tank is empty.
7.
To drain the collectors, disconnect the cold pipe from the bottom of the
collector array.
3.2
Collector glass cleaning
Glass cleaning usually occurs by natural rainfall, however if the installation is in an
industrial (or similar) area with high levels of airborne particles then a qualified person can
clean the collector glass with normal window cleaning chemicals and equipment. If
rainwater collection occurs from the same roof on which the solar water heater is located,
do not use chemical cleaning agents to clean the collectors. Any spillage of these onto
the roof could cause contamination of water in the rainwater tank.
3.3
Hail damage or broken collector glass
In the unusual case that the toughened glass collector covers are broken, Conergy does
not advise replacement of the glass. The entire panel should be replaced to maintain the
performance and integrity of the water heater. Replacement panels should be installed
by a qualified person.