9189PH2CHLOWLOSS

What is the purpose of installing a pressure relief valve in a plumbing system?

• To increase water pressure within the system

• To protect against over-pressurisation of the water

• To regulate the temperature of the water

• To purify the water

Pressure relief valves are usually set to what maximum pressure?

• 1 bar pressure

• 5 bar pressure

• 3 bar pressure

• 10 bar pressure

Where does the valve discharge excess water pressure under a fault condition?

• Into the same system to recirculate

• Directly into the property

• To a safe location, outside of the property, through the discharge pipework

• Into a storage tank for reuse

Why are pressure relief valves most likely to open in a plumbing system?

• The system is overcharged with air.

• The diaphragm in the expansion vessel has ruptured, allowing water on both sides of the diaphragm.

• There is an excess of metallic discharge in the system.

• The discharge pipework is made of plastic.

What is another reason for the pressure relief valve to open according to the text?

• The vessel has an excess of water.

• The vessel has lost its charge of air.

• The discharge pipework is blocked.

• The expansion vessel is over-expanded.

What type of material should the discharge pipework be made of, as recommended in the text?

• Plastic

• Metallic

• Rubber

• Ceramic

Where should the discharge from the pressure relief valve be directed to?

• To a high level in a conspicuous place.

• To a low level in a conspicuous place.

• Directly into the main water supply.

• Into a closed container.

Where is an automatic air vent commonly fitted in a heating system?

• At the lowest points in the system

• At high points in the system

• Outside the building

• Near the water supply

What is the purpose of an automatic air vent (AAV) in a heating system?

• To add air into the system

• To release water from the system

• To release air from the system

• To circulate the water in the system

How does air in radiators affect the heating system's efficiency?

• It improves efficiency

• It has no effect on efficiency

• It leads to efficiency

• It leads to inefficiency