PPT 13 - Testing and replacing components

What is the purpose of following industry standards and manufacturers' instructions in plumbing?

• To increase the cost of installation

• To avoid problems and ensure safety

• To reduce the quality of work

• To make the process faster

What is the most important document to consult when identifying faults with hot water systems?

• User manual

• Manufacturer’s instructions

• Installation guide

• Warranty card

What is an invaluable source of information when identifying faults?

• The customer

• Diagnostic tests

• Repair manuals

• Online forums

Why might a discussion with the customer lead to a successful repair?

• It eliminates the need for any tools

• It often provides detailed fault characteristics

• It replaces the need for professional help

• It always results in a permanent fix

What is the likely fault if discoloured water appears at hot water taps in a system with a double-feed indirect cylinder?

• Pump failure

• Pinhole corrosion in the cylinder heat exchanger coil

• Air in the radiator

• Faulty float-operated valve

If the hot water via the primary circulation pipes is working correctly, but the radiators are lukewarm and cold upstairs, what is the fault?

• Pinhole corrosion in the cylinder

• Air in the radiator

• Pump failure

• Faulty float-operated valve

What should be done if the overflow of the F&E cistern runs constantly, even when the heating system is off?

• Replace the pump

• Adjust the float-operated valve

• Drain down both hot water and heating systems and replace the hot water storage cylinder

• Add corrosion inhibitor

What is the likely cause of no hot water in a semi-gravity system with cold gravity primary circulation pipes?

• Airlock in the system

• Evaporation of water in the F&E cistern

• Faulty thermostat

• Blocked radiator

What is a temporary solution for a radiator that is cold in the middle due to black oxide sludge?

• Replace the radiator

• Flush the radiator with cold water

• Increase the water pressure

• Install a new thermostat

What is required to permanently resolve the issue of black oxide sludge in a radiator?

• Regularly bleed the radiator

• Power flush and add corrosion inhibitor

• Replace the radiator

• Increase the heating temperature