9189 Phase 2 Central Heating PP 7

What is the purpose of positioning in central heating systems?

• To ensure proper heat distribution

• To make it look pretty

• To save space

• To reduce noise

What is the function of port A in the three-port mid-position valve?

• Flow for the boiler

• Central heating

• Hot water

• None of the above.

Port B in the three-port mid-position valve is used for what purpose?

• Central heating

• Hot water

• Flow for the boiler

• All of the above.

What material is the expansion vessel's cylinder made of?

• Plastic

• Steel

• Copper

• Aluminum

Where is the expansion vessel normally installed?

• On the flow

• On the return

• On the supply

• On the drain

What happens to the diaphragm when the water expands?

• It moves forward

• It moves backward

• It stays in place

• It bursts

What is compressed when the diaphragm moves backward?

• Water

• Air

• Steam

• Oil

What valve is provided on the air side of the membrane to charge the vessel?

• Schrader valve

• Ball valve

• Gate valve

• Check valve

Why is a filling loop considered essential in a sealed system?

• It prevents leaks

• It allows for easy filling

• It controls temperature

• It reduces noise

What must be done after filling to protect the cold water main from backflow?

• Leave the system connected

• Disconnect Filling Loop

• Increase water pressure

• Use fluid category 3