AC 2.2 Cold Water Supply Systems in the UK

When is storage of cold water required in the Direct System?

• When using a high pressure hot water storage vessel

• When the hot water supply is from a low pressure hot water storage vessel

• When the cold water supply is low

• When using a combi boiler

What type of valve is used in the WC cistern according to the diagram?

• Lever type valve

• Spherical ball type service valve

• B51212 part 2, 3, or 4 float operated valve

• Gate valve

Which appliance is the first off the cold water main in the direct cold water installation?

• Sink

• WC cistern

• Combi boiler or instantaneous hot water heater

• Bath

What is the main difference between the two types of installations shown in the diagram?

• The type of water heater used

• The location of the storage cistern

• The number of appliances connected

• The type of pipes used

What is the function of the spherical ball type service valve in the system?

• To regulate water temperature

• To control water flow

• To filter impurities

• To increase water pressure

What happens if the cold water main is under repair?

• There is no cold water storage.

• The water becomes hot.

• The water pressure increases.

• The system becomes quieter.

What is a common problem with taps and valves in this system?

• They are always new.

• They never wear out.

• They can be worn or faulty, causing water hammer.

• They increase water temperature.

What is the range of operating pressures for the system?

• 0.5 to 1 bar

• 1 to 2 bar

• 1.5 to 3 bar

• 2 to 4 bar

What is the main purpose of the sandstone aquifer in the diagram?

• To store water

• To filter water

• To provide a source of water

• To increase water pressure

What is the role of the pressure switch/flow controller in the system?

• To measure water pressure

• To control water flow and pressure

• To store water

• To prevent backflow