A.O. Smith TWI 45-190, TWI 35-130 Fill the device 5.1.1 Fill unvented installations

5 Fill

5.1Fill the device

5.1.1Fill unvented installations

Proceed as follows for filling the device:

1.Open the stop valve (11) in the hot water pipe and (if present) the stop valves (4) of the circulation pump (6).

2.Close the drain valve (9).

3.Open the closest draw-off point (14).

4.Open the stop valve (4) on the cold water side (A), causing cold water to flow into the device.

5.Fill the device to the maximum. The device is full when the water flows out of the closest draw-off point in a forceful jet.

6.Bleed the entire installation, for example by opening all draw-off points.

7.The device will now be under water piping pressure. Water should not come out of the expansion valve (15) and out of the T&P valve (3) now. If so, it might be that:

-The water piping pressure is larger than the required 8 bars. Mount a pressure reducing valve (1) after all.

-The expansion valve of the protected cold supply setup is defective or incorrectly mounted.

5.1.2Fill vented installations

Proceed as follows for filling the device:

1.Open the stop valve (11) in the hot water pipe and (if present) the stop valves (4) of the circulation pump (6).

2.Close the drain valve (9).

3.Open the closest draw-off point (14).

4.Open the stop valve (4) on the cold water side (A), causing cold water to flow into the device.

5.Fill the device to the maximum. The device is full when the water flows out of the closest draw-off point in a forceful jet.

6.Bleed the entire installation, for example by opening all draw-off points.

7.The device will now be under water piping pressure. Water should not come out of the T&P valve (3) now. If so, the T&P valve may be defective or have been mounted incorrectly.

36 Instruction manual TWI 35-130 G/TWI 45-190 G