Procedure For Checking The Supply Pressure - A.O. Smith SGS-28 Installation, User And Service Manual

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7.9.2
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10. Use the service menu to switch the pump on (see section 9.2.8.2).
Note
To ensure that the solar heating system is properly filled, the pump in the solar heating
system can be switched on for 2 minutes using the service menu.
11. Repeat steps 6 through 9 until glycol runs out of the air bleed (26).
Note
If an installation does not have a drain-back system, then it should be filled up to
pressure (1.5 bar).
If an installation does have a drain-back system, then it should not be pressurised. For
the installation, filling and drainage of a drain-back system, please refer to the installation
manual and users manual of the solar collectors.
12. Switch off the glycol pump.
13. 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.

Procedure for checking the supply pressure

To check the supply pressure, proceed as follows:
1. Isolate the appliance from the power supply (see section 4.2.2).
2. Carefully remove the covers from the appliance.
3. The electrical section is now visible.
SGS 28 to 60
4. There is a test nipple before the gas control valve (for natural gas appliances) or
before the pressure-reducing valve (for LPG appliances) so that the supply pressure
can be measured.
This test nipple has a sealing screw. Loosen the sealing screw by a few turns. Do not
completely loosen it as it can be difficult to retighten.
SGS 80 to 120
5. The gas control valve has a test nipple that can be used for measuring the supply
pressure.
This test nipple has a sealing screw. Loosen the sealing screw by a few turns. Do not
completely loosen it as it can be difficult to retighten.
IMD-1095a R0
Installation, Maintenance and Service part
IMD-1096a R0