40
FLUSHING THE WATER HEATER
It may be necessary to flush the storage tank and solar collector(s) if there is sediment in the water supply.
This should be conducted in the morning, within three hours of sunrise, when the water temperature inside
the solar collector(s) is lower.
Open a hot water tap and allow the water to run for five minutes immediately prior to flushing or draining
the solar storage tank and / or solar collector(s).
This will assist in the transfer of any high temperature water in the solar collector(s) to the solar storage
tank.
Close the hot water tap.
Warning:
Exercise care to avoid splashing of water, as water discharged from the solar collector(s) and
solar storage tank may be of a very high temperature.
Note:
The water discharged from the water heater may contain sediments and should be diverted away from
any rainwater tank connected to the roof.
To flush the storage tank and solar collector(s):
Turn off the water heater (refer to
“To Turn Off The Water Heater”
on page 38).
Operate the relief valve lever – do not let the lever snap back or you will damage the valve seat.
Operating the lever will release the pressure in the water heater.
From the bottom and top ends of the NPT 200 solar collector(s), unscrew and remove the end plugs.
Open the cold water isolation valve to the water heater.
Allow water to flow from the solar collector(s) until it is clear of any sediment.
When satisfied the solar storage tank and solar collector(s) are flushed, close the cold water isolation
valve to the water heater and reconnect all fittings to their original location.
Open the cold water isolation valve to the water heater fully, check fittings for leaks and switch on the
power.
It is recommended to flush the solar storage tank and solar collector(s) every five years. This will assist in
keeping the solar collector(s), solar cold pipe and solar hot pipe clear of sediment.
