Flushing and filling the system - page 29
Technical changes may be made without notice
Flushing and filling the system
Before filling and pressurising, the system must be flushed, using a solar filling
machine, to remove any contaminants. It is recommended that the solar heat
transfer fluid is used as some parts of the system may not be able to be drained
down.
Connect the pipe from the bottom of the solar filling machine to the fill and drain
valve below the pressure relief valve on the pump station and connect the pipe
from the top of the machine to the fill and drain valve below the flow setter on the
pump station.
Open the fill and drain valves.
Ensure the flow setter is fully open.
Turn the right hand isolating valve (with integrated thermometer) on the pump
station a quarter turn clockwise to close the non-return valve.
Ensure the left hand isolating valve on the pump station is turned to the anti-
clockwise position to allow this non-return valve to be open.
Pour solar heat transfer fluid into the filling machine, ensure the isolation valve is
open on the bottom of the machine then switch it on to allow the fluid to circulate
through the system for 30 minutes to flush out the air and any possible debris.
To clear any air or debris from the flow setter and pump, turn the right hand
isolation valve anti-clockwise for 5-10 seconds then turn back clockwise.
To pressurise the system, close the fill and drain valve below the flow setter and
watch the pressure gauge on the pump station rise to 3 bar, close the fill and drain
valve below the pressure relief valve and then turn off the machine.
It is vital that the system is pressurised to 3 bar as this raises the temperature
boiling point of the heat transfer fluid.
Disconnect the machine and screw blanking caps on to the fill and drain valves on
the pump station. Next, make sure both isolating valves on the pump station are
turned to the anti-clockwise position.
0
20
40
60
80
100
120
140
160
1 bar
2bar
3bar
4bar
Temperature ºC
Pressure
