central heating 1

1. The British Standard for the design of water based heating systems is:

• b. BS EN 12828
• a. BS 6700
• c. BS EN 12058
• d. BS 9001

1. The conservation of fuel and energy is covered by which approved document?

• a. Building Regulations part A
• c. Building Regulations part Q
• d. Building Regulations part L.
• b. Building Regulations part K

1. Describe what the main purpose of a central heating system is:

• To increase humidity in a property
• To provide cooling in a property
• To reduce noise in a property
• To provide thermal comfort in a property

1. Describe some of the key differences between a low pressure open vented system and a pressurised sealed system.

• The key differences between a low pressure open vented system and a pressurised sealed system are the water source (cistern vs. mains supply) and the method of maintaining pressure (gravity vs. sealed vessel).
• HIGH pressure systems: These are fed from a feed and expansion cistern located at high level. These can be HALF pumped or gravity systems.

• high pressure systems: These are fed from a feed and expansion cistern located at low level. These can be fully pumped or gravity systems.

• High pressure vs. low pressure

1. Describe the primary function of the open vent on a central heating system.

• controls the temperature of the water
• used to increase system pressure
• aesthetic feature for the system
• safety outlet, if system overheat, atmospheric pressure.

1. According to British Standards, what must not be installed on the open vent pipework?

• Valves.
• Fittings
• Gauges
• Pipes

1. Identify the pipe that should be connected to this air

separator at point A.

• Secondary air supply pipe
• Main air supply pipe
• Water supply pipe
• The flow to the system

1. What is the maximum distance between the open vent and cold feed on an H frame?

• 150mm
• 160mm
• 140mm
• 120mm

1. Describe the consequence of installing the circulator to a central heating system in A position.

• System under positive pressure and circulator will push up into cistern.

• System under negative pressure and circulator will push up into cistern.

• System under positive pressure and circulator will push water into the vent.

1. Describe the consequence of installing the circulator to a central heating system in B position.

• Correct installation with system under positive pressure and neutral point at base of cold feed.

• System under negative pressure and circulator will push up into cistern.

• System under positive pressure, and circulator pumping over the vent pipe.