6035 Hot Water | LO5

SCENARIO: A run of pipe has been isolated but water is still flowing from the outlet. What problem could be causing this situation?

• Unbalanced pressure

• Faulty valves

• Water hammer

• Faulty thermostat

From the following, which would not be inspected for noises made from pipe expansions?

• Clips or brackets

• Notches

• Limescale levels

• Insulation

At what velocity can the flow of water become audible?

• 1m/s

• 2m/s

• 3m/s

• 4m/s

In order to comply with BS6700, what can be done to the system to reduce the velocity of water?

• Increase the pipe diameter

• Reduce the pipe diameter

• Install an expansion vessel

• Install a pressure reducing valve

In the case of a single feed cylinder needing to be replaced, which alternative cylinder can be installed instead?

• Unvented cylinder

• Indirect cylinder

• Multi-coil cylinder

• Direct cylinder

If there is no hot water from a basin tap on a indirect pumped system, what would be the fault from the following?

• Cylinder thermostat failure

• Loss of air bubble

• Failure of heat exchange coil

• Unbalanced pressure

On an indirect cylinder, the customer would not notice the back-up heat source is faulty until it is required. What is the back-up heat source on an indirect cylinder?

• Solid fuel boiler

• F&E cistern

• Immersion heater

• Expansion vessel

An indicator that there is a fault from the heat exchange coil would be?

• Discolouration of cold water

• No hot water from the outlets

• MCB continuously tripping

• Discoloration of hot water

If the cylinder thermostat is faulty, what temperature would the boiler thermostat shut off the system?

• 60-65°C

• 70-75°

• 80-85°

• None, the boiler would not shut off the system

Which British Standards states that the hot pipe should be above the cold pipework, and that if there is any possibility of heat transfer the pipe should be insulated?

• BS6700

• BS8000

• BS1212

• BS EN 104 85