WorksheetsCentral Heating Systems
Total questions: 21
Worksheet time: 11mins
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
What type of central heating system is filled using a filling loop?
Y-plan plus system
W-plan system
Sealed system
Open vented system
What standard outlines the commissioning procedure for a central heating system?
BS EN 806
BS EN 14336
BS EN 12828
BS EN 442
Which of the following is NOT an advantage of underfloor heating?
Pipework is hidden
The system is efficient
Low maintenance
Suitable for existing properties
Which of the following is NOT an advanced control installed with a central heating system?
Weather compensation
Automatic by-pass
Delayed start
Optimum start
How does a three-port divertor valve work?
Central heating priority
Timed priority
Hot water priority
Equal system pressure
Which is the principal way in which a radiator heats up a home?
Convection
Radiation
Infrared
Conduction
You are called to a customer's property, where a radiator fitted with a TRV is not getting hot. What could be the problem?
The circulator has failed
The boiler has not fired
The regulating pin in the head is stuck
There is blockage in the return pipe
What would be the primary symptom if a circulator were positioned prior to the open vent pipe?
Pumping over
Over heating
Restricted heating
Positive pressure
What is required to be installed either side of a circulator?
Air release valve
Isolators
Zone valves
Lockshield valves
When replacing a synchron motor, what should be your first course of action?
Release the motor housing and pull the tab connectors off
Isolate the electrics and check the supply is dead
Disconnect the wires, noting the connections
Isolate the water for the boiler
Which statement best describes a programmer?
A switched timer that controls the boiler
A controller that is designed to directly activate the pump and boiler
A switched timer that independently controls the hot water and heating systems
A timer that activates the zone valves
