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

• To increase water pressure

• To protect against over-pressurisation of the water

• To reduce water temperature

• To filter impurities.

Pressure relief valves are usually set to ___ bar pressure.

• 1

• 2

• 3

• 4

What is one reason why a pressure relief valve might open?

• The diaphragm in the expansion vessel has ruptured

• The vessel is overfilled with air

• The discharge pipework is plastic

• The system is too cold.

Fill in the blank: Pressure relief valves are most likely to open because of a lack of room in the system for expansion, due to a malfunction with the ________.

• discharge pipework

• expansion vessel

• heating element

• water supply

What is the primary function of an Automatic Air Vent (AAV) in a heating system?

• To increase water pressure

• To release trapped air

• To heat the water

• To cool the system.

Trapped air within heating systems can cause several problems. Which of the following is NOT one of them?

• A) Air leads to corrosion

• B) Lack of circulation through airlocks

• C) Air in radiators leads to inefficiency

• D) Decreased water temperature.

What is the primary function of a mechanical cylinder thermostat?

• To control the temperature of a hot water cylinder

• To increase water pressure

• To filter impurities

• To reduce noise

A mechanical cylinder thermostat is a non-electrical valve used mainly on ______ primary circulation.

• electrical

• gravity

• pumped

• manual

What is the primary function of Thermostatic Radiator Valves (TRVs)?

• To control the air flow in a room

• To control the temperature of the room by controlling the flow of water through the radiator

• To measure the temperature of the room

• To provide heat to the room.

Fill in the blank: Thermostatic Radiator Valves (TRVs) have a heat-sensitive head that contains a cartridge filled with a liquid, a gas, or a wax which _______ with heat.

• A) contracts

• B) expands

• C) solidifies

• D) evaporates