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Worksheets6035 | Central Heating LO1 Part 2
Total questions: 14
Worksheet time: 7mins
The open vent to the F&E cistern must rise how far above the water level?
150mm
200mm
450mm
1000mm
The circulator should be located a minimum of _____ below the F&E.
1 metre
2 metres
5 metres
7.5 metres
The British Standards governing the float operated valves is?
BS EN 806
BS 6700
BS 8000
BS 1212
How much does the system water expand by when heated?
4%
10%
1,600 times
0%
The purpose of an air separator is?
To allow close coupled pipework when positioning the cold feed and vent pipe
To compensate for pressure differences when systems are not fully pumped
To allow additional connections when installing the S-plan system
To allow pressure relief when the water has expanded
The maximum distance between the vent pipe and cold feed on a H-frame configuration is?
200mm
175mm
150mm
100mm
What does port A for the three port mid-position valve control?
The flow for the boiler
Central heating
Hot water
A frost thermostat located on vulnerable pipework will override the programmer when it senses temperatures below _____.
0°C
-3°C
5°C
10°C
Statement: The primary vent must terminate over the CWSC due to the chemical inhibitor present in the primaries.
True
False
Which radiator valve would be be considered the valve adjusted by the engineer?
Wheelhead valve
TRV
Remote head
Lockshield valve
To ensure the radiators have been balanced correctly, what temperature difference should there be between flow and return pipework?
0°C
5°C
10°C
15°C
The radiator that heats up last in the system is referred to as?
Principle radiator
Index radiator
Convection radiator
Prefect radiator
The rule of thumb method is referred to as:
The sizing of the CWSC and F&E
The maintenance of primary and secondary waters
The principle of balancing the central heating system
The method of installing radiators to the correct height
In order to allow the air to be released from the system, what is installed at high points in the system?
Automatic bypass valve
Pressure relief valve
Expansion vessel
Automatic air valve
