Central Heating Systems

A house which has a floor area of 162 m² should comply with which of the following control principles:

• Controlled under one zone with one time-clock or programmer

• Split into two zones and controlled with one time-clock or programmer

• Controlled by one zone valve providing all radiators are fitted with thermostatic control

• Split into two zones, each zone having independent time control

Identify the component in the image below:

• Underfloor heating manifold

• Low loss header

• 'H' Frame

• Magnetic filter system

What is the most suitable backflow prevention device to be installed to the filling loop between the heating circuit and the mains cold water in a domestic situation?

• Single check valve

• AUK air gap

• Double check valve

• RPZ valve

When designing a central heating system for a new dwelling, which of the following British Standards would be most relevant for reference?

• BS 6700

• BS EN 806

• BS EN 14336

• BS 7671

Identify the pattern of the underfloor heating pipework in the image below.

• Snail

• Bifilar

• Linear

• Series

What is the most efficient method of connecting radiators to pipework?

• BOE

• TBOE

• BBOE

• TBSE

Where is the best place for an automatic bypass valve to be installed?

• On the flow pipe immediately above the boiler

• On the primary return after the circulator

• Between the flow and return pipes near to the hot water cylinder

• Between the flow and return pipes of the index radiator

Where does the system water flow to on the 'B' connection of a three-port mid-position valve?

• The boiler

• The hot water cylinder

• The radiators

• Both the heating and hot water circuits

Which central heating system incorporates two two-port valves to control the system water?

• S-plan system

• Y-plan system

• C-plan system

• W-plan system

On a central heating system with a conventional boiler, what is the recommended temperature difference between the flow and return pipework?

• 25°C

• 20°C

• 15°C

• 10°C