A.O. Smith SGE Installation And Operation Manual page 52

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Filling
10. Repeat steps 6 through 9 until glycol runs out of the air bleed (26).
Note
The system does not need be filled to a certain pressure. The pressure in
the system will increase when the fluid heats up and expands.
11. Switch off the glycol pump.
12. Close the valve of the inlet combination and disconnect the glycol pump
(including the hoses).
Note
Dispose of the residual glycol in the filler hose in an environment-friendly
manner, and according to local regulations.
Caution
The very first time the appliance is started, the correct fluid must be
set (12.9.2 "Setting the heating fluid type in the solar heating system")
Service Menu.
Note
If the system is equipped with a drain-back tank, then the system must be
filled to a certain pressure. For the installation and filling of a drain-back tank,
please refer to the installation and users manual of the solar collector.
gis
using the
Instruction manual SGE