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WorksheetsEAL Level 3 Central Heating
Total questions: 27
Worksheet time: 14mins
Which of these is the correct feature of an under floor central heating system.
If used under concrete flooring, larger diameter pipes are required.
The larger surface area means that lower water temperatures are required.
They cannot be used in conjunction with a radiator system.
They can only be fitted under a concrete floor.
What control reduces energy use by holding up the boiler start time when the weather is mild?
Boiler energy manager
Optimum start
Delayed start
Boiler compensation.
To enable the correct flow rate through a multi boiler installation, it is usually connected to?
Multiple pumps.
A buffer tank.
A low loss header.
A booster pump.
Which control on this manifold, controls the temperature of the water on an under floor heating system.
A
B
C
D
Ground source heat pumps, obtain the majority of heat from?
Soil heated by warm rain water.
Solar heat stored in the ground
Geothermal energy from underground
Solar energy when the sun is shining.
The safest method of ensuring that the electrical supply cannot be turned on when working on the electrical installation is
Isolate the system at the consumer unit.
Turn off the supply at the fused spur and check for safe isolation.
Cover turned off fused spur with insulation tape.
Switch off the supply at the fused spur remove the fuse and keep the fuse with you, and check for safe isolation.
Which electrical test will show that the electrical wiring has been crossed, in the pumps wiring connection.
Insulation resistance test.
Short circuit test
Polarity test.
Earth continuity test.
What can be responsible for pressure loss on a sealed central heating system?
A leaking radiator valve.
Boiler set to maximum.
Hot water draw off tap leaking.
Circulating pump set at maximum.
The best method of obtaining fault details on a central heating system is?
Change components one by one until the fault is rectified
Question the customer to establish exactly what the fault is
Check the manufacturers fault finding list.
Keep trying the operations of the system hoping that the fault rectifies itself.
To correctly identify a fault on a boiler an engineer will first.
Check components one by one.
Change components one by one until the fault is rectified
Follow the manufacturers fault finding chart.
Physically check all of the electrical connections.
Blockages in heat emitters are more effectively removed by.
The system pump in reverse.
Heating the system up to a maximum and then draining the system.
A flushing machine with cleaning chemicals.
Flushing the system with cold water at mains pressure.
Which valve is used to isolate a central heating pump in order to replace it.
A
B
C
D
To check that the hot water temperature is correct on a fully pumped central heating system, the engineer will first check the.
Boiler thermostat
Cylinder thermostat
Room thermostat
Two port valve.
To check that the hot water temperature is correct on a fully pumped central heating system, the engineer will then check the.
Temperature difference between the hot and cold outlets.
The pump speed.
The delivery flow rate at the hot water outlet.
The temperature of the water at the hot water outlet.
It is recommended to service a central heating boiler
Every twelve months
Every time the boiler breaks down.
Only with a flue gas analyser.
Once every two years.
One piece of information to be recorded on the boiler commissioning completion certificate is.
Whether copper or plastic pipe was used.
The location of the boiler
The number of radiators fitted and their output.
The type of controls that are fitted.
What advice does not need to be given to the customer on commissioning a central heating system.
The heat output of the radiators.
The use of the timer
How to set the thermostatic radiator valves.
Setting of the thermostats.
To ensure correct balancing of the central heating circuit it is advisable to start with.
All emitters open.
The index circuit.
The hot water cylinder circuit.
Both the emitter and cylinders circuits on.
What two items must be checked before filling the system with water?
All joints are correctly tightened and soldered.
Pump running.
The ball valve is tied up.
Air vents closed
Insulation is fitted to the pipe work.
The installation of a central heating system must be notified to.
Manufacturer of the boiler
The water company
Institute of heating engineers.
The local building control officer.
During commissioning of a system, the engineer is unsure of the correct procedure. Where can this information be found?
The essential guide to gas safety.
The benchmark log book,
The central heating system specification.
The manufacturers instructions.
What is added as part of the commissioning process to a system, to ensure the removal of foreign bodies that may cause corrosion.
Neutraliser
Cleanser
Inhibitor
System restorer.
While commissioning a system the engineer notices that two of the radiators are not at the required temperature while the rest are perfect. What does this signify.
Boiler thermostat set to low
Room thermostat faulty.
Balancing of system incorrect.
Heating zone valve faulty.
A cold flush is done on a new central heating system to.
Remove debris
Remove flux
Check for leaks
Improve system safety.
Which document can be used to record the correct commissioning procedure has been carried out on a central heating system.
CP12 form
Benchmark log book
Manufacturers guarantee card
Sales invoice.
It is recommended that metallic pipe work in central heating systems be tested for soundness at what pressure.
Twice its maximum operating pressure
Its operating pressure
1.5 times its operating pressure
0.5 times its operating pressure.
Which wire is missing from this simple pump over-run functional flow diagram to enable correct operation?
B - D
A - C
A - D
B - C
