Level 3 central heating phase 2

Which of these is NOT an advantage of underfloor heating, as compared to traditional radiator type systems

• · A more even temperature gradient within the room

• · Energy efficient

• · Ease of control over a number of zones/rooms

• Less pipework

What is the typical flow temperature of an underfloor heating system laid in a screeded concrete floor

• 35–45⁰C

• 40–45⁰C

• 50–60⁰C

• 70–80⁰C

What size pipework is underfloor heating pipework

• 18mm outside diameter and a 14mm internal diameter,

• 22mm outside diameter and a 12mm internal diameter,

• 16mm outside diameter and a 10mm internal diameter,

• 16mm outside diameter and a 12mm internal diameter,

What temperature can Pex-Al-Pex pipe withstand

• Pex-Al-Pex pipes can withstand up to 95ºC

• Pex-Al-Pex pipes can withstand up to 85ºC

• Pex-Al-Pex pipes can withstand up to 75ºC

• Pex-Al-Pex pipes can withstand up to 100ºC

What spacings are normally used for underfloor heating

• The pipes are usually installed 100–280mm apart across the floor of the room.

• The pipes are usually installed 50–225mm apart across the floor of the room.

• The pipes are usually installed 150–225mm apart across the floor of the room.

• The pipes are usually installed 250–380mm apart across the floor of the room.

1. Define the term ‘neutral point’ in relation to central heating.

• The point where the pump is placed

• The neutral point is the point where the vent pipe connects to the heating circuit.

• The neutral point is the point where the cold feed connects to the heating circuit.

• The neutral point is where the cold feed connects to the vent pipe

What is the minimum recommended height of the open vent pipe beyond the water level of the F&E cistern?

• A minimum height of 500mm is normally suitable for fully pumped systems

• A minimum height of 1450mm is normally suitable for fully pumped systems

• A minimum height of 300mm is normally suitable for fully pumped systems

• A minimum height of 450mm is normally suitable for fully pumped systems

What component within a sealed heating system produces the ‘neutral point’ within the system

• The expansion vessel creates the neutral point within a sealed system.

• The pressure reducing valve creates the neutral point within a sealed system.

• The filling loop creates the neutral point within a sealed system.

• The non return valvel creates the neutral point within a sealed system.

On an open vented system what is the correct orientation of the vent, cold feed and pump arrangements

• Open vent Cold feed pump

• Vent cold feed pump

• Pump vent cold feed

• Pump vent cold feed

What is the maximum distance between the open vent and cold feed on an H-frame

• 100mm

• 125mm

• 150mm

• 175mm