Duplicate of City & Guilds 6035-02 Unit 208 Central heating systems

In a two pipe central heating system?

• The flow and return water mixes
• The flow and return water is kept separate
• The flow and return water is at the same temperature
• Flow water is at a lower temperature than the return water

The boiler position can be higher than the hot water cylinder in a?

• System with microbore heating with gravity primaries
• Combined hot water and heating system with vented primaries
• Fully pumped sealed system
• One pipe gravity system

This symbol from BS 1192 indicates a C/H component. Where in a C/H system would this be found?

• The primary flow to the hot water cylinder
• Immediately after the circulator and before the zone valve
• On a sealed system filling loop
• Cold feed from the feed and expansion cistern

What component allows the customer independent control of the H/W and central heating system?

• Room thermostat
• Programmer
• Three port mid-position valve
• Cylinder thermostat

Which of the following assists in the removal of flux from central heating pipework?

• Adding an inhibitor to the system after commissioning
• Set the working temperature of the system to a max of 65°C
• Flushing the system out prior to the handover
• Set the circulator to max for 1 hour after soundness testing

Downstairs radiators are cold and the upstairs radiators are only lukewarm. Caused by a faulty?

• Three port mid-position valve
• Circulator
• Room thermostat
• Boiler

Hot water circulates to each radiator by gravity in which of the following systems?

• One pipe system
• Fully pumped system
• Microbore system
• Two pipe reverse system

A zone valve in an S plan central heating system is designed to?

• Allow the central heating system never to reach 100°C
• Stop circulator noise from entering the C/H system
• Prevent the flow and return waters from mixing
• Isolate the central heating circuit when there is no demand

The main objective of installing a central heating system in a property is?

• To allow customer control of timings
• To conserve fuel
• Thermal comfort
• To fully heat a property up to 18°C

Installing a C/H system using polybutylene pipe, the most common jointing method used is?

• End feed solder fittings
• Push fit fittings
• Solvent welded fittings
• Compression type A fittings