PP4 Safety Devices in Unvented Hot Water Systems

What is one of the safety devices used in unvented hot water systems?

• Pressure gauge

• Control thermostat

• Water filter

• Flow meter

Which safety device in unvented hot water systems is also known as a thermal cut-out?

• Pressure relief valve

• Control thermostat

• Overheat thermostat

• Temperature gauge

Why is temperature control crucial in unvented hot water storage vessels?

• To maintain water quality

• To prevent pressure build-up

• To avoid overheating

• To reduce energy consumption

What happens to the boiling point of water as pressure increases in an unvented hot water storage vessel?

• It decreases

• It remains the same

• It increases

• It fluctuates

What is the primary function of the control thermostat in a hot water system?

• To increase the water pressure

• To regulate the water temperature

• To filter the water

• To control the water flow

At what temperature range is the control thermostat typically set?

• 50-55°C

• 60-65°C

• 70-75°C

• 80-85°C

What does the thermostat do when the cylinder temperature drops?

• Signals the zone valve to close

• Signals the zone valve to open

• Increases the water pressure

• Shuts down the energy source

What is the function of the second tier of safety in the energy cut-off system?

• To increase energy efficiency

• To turn off the energy source when the water temperature reaches 80–85°C

• To provide a backup power supply

• To monitor the energy usage

Which of the following is NOT a function of the temperature/pressure-relief valve?

• Discharging water when the temperature exceeds 95°C

• Functioning as a pressure relief valve

• Increasing the temperature in vessels

• Being factory-fitted

What controls the directly heated cylinder in a direct system?

• External thermostat

• Manual switch

• Integral thermostat

• Remote control