Central heating systems 2025

What type of systems?

• S plan

• 
• Y plan

• 
• Two pipe system

• 
• One pipe systems

• 

What type of systems?

• Pumped system

• 
• Sealed system

• 
• Two pipe semi gravity with heat sink

• 
• C plan

• 

Match the following

• Two pipe semi gravity heat sink

• 
• Two pipe semi gravity C plan

• 
• Two pipe semi gravity

• 
• One pipe gravity system

• 

Identify the systems

• Sealed system

• 
• Pumped central heating

• 
• Fully pumped 2, two port valves – S plan

• 
• Fully pumped mid-position valve – Y plan

• 

This allows the system to discharge pressure to a safe location if required.​ (a)  

• pressure relief valve
• filling loop
• pressure gauge
• non return valve

The system water will expand by ​​ (a)   when heated, and this expansion needs ​ to be taken up in the F&E.​

• 4%
• 10%
• 8%
• 5%

What is the BS number for FOV ?​ (a)  

• BS1212
• BS6700
• BS442
• BS8000

The vent and the cold feed need to be installed on the flow from the boiler, on the suction side of the circulator, with a maximum of​ (a)   between them, ensuring that the circulator always draws on the cold feed.

• 150mm
• 450mm
• 200mm
• 100mm

On a three port mid-position valve. AB = ​ (a)   ​ ​

• flow for the boiler
• central heating
• Hot water cylinder coil
• cold water

Room thermostat. Situated ​ (a)   up a wall and approximately and ​ (b)   away from a heat source.

• 1.5M
• 3M
• 3.5M 
• 2M
• 1M