Installation manual

I
NSTALLATIONSECTION 3
16
Fill Flush Drain Valve:
A
fill, flush and drain valve is fitted. The valve is used to initially fill the system by Andrews
Water Heaters. As this valve is to be used for draining as well as for filling it is
recommended that this is installed in the lowest part of the solar circuit. Flexible
connections are recommended to attach to drain. This will allow easy connection and
reconnection of the drain after filling.
AIR ELIMINATOR (optional)
EXPANSION:
The expansion vessel will be pre-fitted and piped on the solar station. The vessel will have
been sized for the initial specification of the system, taking into consideration pipework runs.
If the solar volume has been increased for any reason or more importantly if extra collectors
are added or changed for different types, the expansion vessel size may have to be changed.
Under such circumstances please contact Andrews Water Heaters for advice.
If the unit is not pre-fitted it is important that either the vessel is installed upside down where
possible, or lower than the solar circuit. This helps prevent the potentially high temperature
heat transfer fluid reaching the vessel.
NOTE: A correctly sized expansion system should always be fitted to the solar
circuit. This expansion system should be sized for temperatures and expansion
associated with a solar system.
ANCILLARY
EQUIPMENT