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Introduction
Release R.1.3 UK 39
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4 Filling 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.
4.2 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
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 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
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 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 T&P valve c. If this does happen, the T&P valve
might be defective or incorrectly fitted.
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