Unit 309 Session 7 Central heating research PT5

What is the purpose of balancing a central heating system?

• To increase the temperature of the system

• To ensure an even heat distribution throughout the system

• To decrease the overall heat output

• To make the radiators operate independently

What do thermostatic radiator valves (TRVs) control?

• The pressure of the water in the radiators

• The temperature of the water leaving the boiler

• The temperature of the room by controlling the flow of water through the radiator

• The speed at which the radiator heats up

Which of the following statements is true about most TRVs?

What is the function of wheel head valves?

• To allow manual control of the radiator by being turned on or off

• To automatically control the temperature of the radiator

• To regulate the flow of water through the radiator during system balancing

• To increase the flow rate through the radiator

Who is intended to operate lockshield valves?

• Any householder

• A plumber only

• The manufacturer of the radiator

• The person installing the heating system

What is the function of automatic air valves in a central heating system?

• To prevent water from escaping the system

• To allow air to escape from the system while preventing water from entering

• To maintain a minimum flow rate through the boiler

• To control the temperature of a hot water cylinder

How do automatic bypass valves help in a fully pumped heating system?

• They prevent air from being drawn into the system

• They control the temperature of the hot water cylinder

• They maintain circulation through the boiler and prevent overheating by gradually opening

• They seal themselves when water arrives at the valve

Why are automatic bypass valves considered better than fixed bypass valves?

• They prevent the system from drawing in air

• They take the flow of hot water away from critical parts of the system, which increases efficiency

• They are non-electrical and control the temperature of the hot water cylinder

• They reduce the efficiency of the system and increase fuel usage

What is the primary purpose of thermo-mechanical cylinder control valves?

• To allow air to escape from the system

• To maintain circulation through the boiler

• To control the temperature of a hot water cylinder

• To prevent water from escaping the system

What is the purpose of a thermo-mechanical cylinder thermostat in a gravity circulation system?

• To control the flow of water in the system

• To provide a minimum standard of hot water control as per Building Regulations

• To prevent unwanted gravity circulation to upstairs radiators

• To measure the temperature of the water sent to a remote sensor