hot water 7 revision

Which one of the following pieces of information will be provided by the installation plan?

• The position of the hot water pipes and valves in a dwelling

• The order in which work should take place

•   The expected completion date

• The dwelling position on the estate

The water supply (water fittings) regulations 1999 lay down:

 

• The regulations covering all internal and external hot and cold water systems for dwellings

• The guidance for good practice when installing hot and cold pipework in a dwelling

• The regulations that cover hot water systems only

• The guidance for internal hot and cold water systems only within a dwelling.

1.    Which one of the following hot water components should be fixed using flexible connections?

• Indirect hot water cylinder

• Booster pump for a shower

• Shower mixer valve

• Shower mixer valve

 

A rigid pipework hot water system has a working pressure of 4bar. At what pressure should the pipework be tested for soundness?

• 4bar for 30mins then 6bar for 15 minutes.

• 1½ times the working pressure for 15 minutes

• 6bar for one hour

• 1bar for 60 minutes

1.    To prevent electrolytic corrosion taking place in a system, where can the magnesium rod be placed?

• The cold water storage cistern

• The circulator

• The hot water cylinder

• The open vent.

1.    Guidance on the installation procedures for domestic hot water systems can be found in:

• BS6700

• Specification of work

• Domestic Water Act 2007

•   Local Authority Regulations.

1.    In a customer’s property, the CWSC supplies both the hot and cold water systems. The minimum size of this cistern is:

• Twice the size of the domestic hot water cylinder.

• 230 litres

• Equal to 48 hours’ worth of water

• 100 litres

Which of the following appliances is most likely to offer the customer low pressure at a hot water outlet?

• Combination boiler

• Combination unit

•   Direct cylinder

• Indirect cylinder.

  What is this item?

• Stop valve

• Double check valve

• Blending valve

• Pressure/temperature relief valve

If hard water is allowed to be heated above 65⁰C, what could be the consequence in the system?

• The efficiency could be affected by limescale.

• Legionella could grow

• The blending valve would fail to work

• The pressure relief valve would open