gis

Introduction

4Filling and draining

4.1 Introduction

Topics covered in this chapter:

 

Filling the appliance.

 

Draining the appliance.

The components referred to in these paragraphs are illustrated in Figure 4.1.

4.2Filling the appliance

4.2.1Filling unvented installations

To fill the appliance, proceed as follows.

1.Open the stop valve i in the hot water pipe and, if present, the stop valves d for the circulation pump.

2.Shut drain valve g.

3.Open the nearest hot water draw-off point l.

4.Open the supply valve i on the cold water side aso that cold water flows into the appliance.

5.Completely fill the appliance (when cold water flows at normal pressure from the nearest hot water draw-off point, the appliance is full).

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

7.The appliance is now under water supply pressure. There should be no water coming out of the overflow valve m nor the T&P valvec. If this does happen, the cause might be:

-The water supply pressure is greater than the specified 8 bar. Rectify this by fitting a pressure-reducing valve a.

-The overflow valve in the protected cold supply setup is defective or incorrectly fitted.

4.2.2Filling vented installations

To fill the appliance, proceed as follows.

1.Open the stop valve i in the hot water pipe and, if present, the stop valves d for the circulation pump.

2.Shut drain valve g.

3.Open the nearest hot water draw-off point l.

4.Open the supply valve i on the cold water side aso that cold water flows into the appliance.

5.Completely fill the appliance (when cold water flows at normal pressure from the nearest hot water draw-off point, the appliance is full).

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

7.The appliance is now under water supply pressure. There should be no water coming out of the T&P valve c. If this does happen, the T&P valve might be defective or incorrectly fitted.

Release R.1.3 UK

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A.O. Smith 28 30 50 60 Filling and draining, Filling the appliance Filling unvented installations, Draining the appliance