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7.8.2
68
5.
Completely fill the water heater. When a full water jet flows from the nearest draw-
off point, the water heater is full.
6.
Bleed the entire installation of air, for example by opening all draw-off points.
7.
The water heater is now under water supply pressure. There should now be no water
coming out of the inlet combination expansion valve or (if used) out of the T&P valve
(3). If there is, the cause might be:
-
The water supply pressure is greater than the specified value (see section
12.1).
Rectify this by fitting a pressure reducing valve (1).
-
The expansion valve in the protected cold supply set-up is defective or
incorrectly fitted.
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.
SUF 60-120 to 100-250
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.
IMD-1095a R0
Installation, Maintenance and Service part
IMD-1096a R0
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