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3.2 Draining
0312729_IT_1500-3000_NLENFR_V3.1, 2024-01-22
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 (1.6 "General
specifications"). Rectify this by fitting a pressure reducing valve (1).
-
The expansion valve in the protected cold supply set-up is defective or
incorrectly fitted.
1. Close the stop valve (4) between the cold water head tank and the cold water
inlet (A).
2. Open the drain valve (9).
3. Bleed the water heater (or installation) so that it drains completely.
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