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Introduction

Release R.1.3 UK

gis

Filling and draining

4.1

Introduction

Topics covered in this chapter:
•

•

The components referred to in these paragraphs are illustrated in

4.2

Filling the appliance

4.2.1

Filling 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

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 a so 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.

4.2.2

Filling vented installations