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Worksheetscentral heating advanced questions
Total questions: 71
Worksheet time: 38mins
What type of boiler is this
A system boiler
A hot water only boiler
Central heating only boiler
A combination boiler
What are these components called and what are they used for
Automatic air release valves fitted at the lowest point of a central heating system to trap and release air build up in the system
Automatic air release valves fitted at the highest point of a central heating system to trap and release air build up in the system
Automatic siphon valves fitted at the high point of a central heating system to trap and release air build up in the system
Drain off valve valves fitted at the lowest point of a central heating system to trap and release air build up in the system
This component is called a:
3 port actuator valves
2 port actuator valves
Automatic bi-pass valve
Solenoid valve
What is this photo indicating
The paint is coming off the radiator
The radiator is getting too hot
Poor circulation due to a build up of iron-oxides
Poor circulation due to a build up air
What is this pipework component called
Maxitee
Manifold
Bodge up
Blending valve
Which radiator has the highest output
You cant tell by looking, your need to consult the manufactures technical data
What is the purpose of a Thermostatic valve on a radiator
To control the temperature of the water in the radiator
To turn off the radiator when the air temperature in the room is at the required level according to the setting on the valve head
To turn off the radiator when the air temperature in the room is at the required level according to the room thermostat
To turn on the radiator when the air temperature in the room is at the required level according to the setting on the valve head
What type of boiler is this
A system boiler
A hot water only boiler
Central heating only boiler
A combination boiler
What is the name of this central heating system component
Feed and expansion tank
Ventilation tank
Feed and expansion cistern
Cold water storage cistern
What one of these components is NOT installed on a sealed heating system
What is the name of this component
Feed and expansion tank
Pressure reservoir
Expansion vessel
Discharge valve
Why are inhibitors added to a heating system
To prevent iron oxide build ups
To prevent the water from freezing
To reduce noise in the system
All the answers
To prevent limescale build up in a boiler heat exchanger
What is the name of this type of heating system
Two pie
Reversed return
One pipe
Secondary circulation
Approximately how much heat is convected through the fins on the back of the radiators?
100%
85%
50%
25%
Manufacturers recommend that depending on the height of the skirting, radiators should be fitted at least _____ from the floor.
100mm
150mm
250mm
400mm
Which of the following is not a variation of connections for the radiator valves?
TBOE
BBOE
TBSE
TTOE
Low surface temperature radiators are designed in order to keep the surface temperature low enough to not cause harm to any that touch. What temperature does it not exceed?
75°C
52°C
43°C
25°C
Which of the following types of heat emitters potentially has blocked fins due to dust build-up?
Skirting convector
Fan convector
Kickspace heater
LST radiators
The diagram shown can be identified as:
Insulation plan
Floor layout
Underfloor heating system
Trace heating system
One radiator in the circuit must be left without a TRV fitted. Building Regulations state it should be the:
Bathroom radiator
Hallway radiator
Front room radiator
Kitchen radiator
Which Building Regulation covers Central Heating
part L
part F
Part J
Part G
Which type of boiler can meet the demand of both central heating & hot water
Combination
Heat only
Regular
System
what does F&E stand for
Float and expansion
Feed and expansion
Feed and evaluate
Free and expansion
what is an advantage to a one pipe system
cheap to install
looks nice
doesn't require cleaning and maintenance
each radiator progressively cools down
what is the size of the primary pipework on a 2 pipe system incorporating a back boiler
22mm
28mm
15mm
54mm
what is another name for a semi gravity two pipe system
c plan
s plan
y plan
f plan
identify which components are needed to be added to the system to make a c plan a c plan plus
zone valve
cylinder stat
TRV's
Room stat
Which system uses a 1 x 3 port Mid position valve
Y plan
S plan
C plan
F plan
Which system uses 2 x 2 port zone valves
S plan
Y plan
F plan
C plan
When a property has a floor area of over 150m2 it requires additional zoning. What type of system is this
Y plan +
S plan +
C plan +
F plan +
On a three port mid position valve it is important to pipe up the correct port, which of the following is correct
AB- flow from boiler
A- flow to heating circuit
B- flow to cylinder
AB- flow to heating circuit
A- flow to cylinder
B- flow from boiler
AB- flow to cylinder
A- flow to heating circuit
B- flow from boiler
what is the purpose of central heating
to provide thermal comfort
keep you warm
stop damp
help indoor plants grow
identify this system
Y plan
S plan
C plan
S plan +
identify where this float operated valve would found in a heating system
F&E tank
CWSC
Boiler
Zone valve
What should be done before working on any electrical component, including the boiler?
Lock off the fuse holder ( safe isolation )
Remove the fuse from the boiler
Switch off the central heating system
Switch off the boiler
What is the purpose of balancing the system when the system is commissioned?
To switch off the central heating system
To remove hydrogen from the system
To remove debris from the installation process
To ensure uniform heating of radiators
What is the recommended temperature difference between the flow and return pipework when the system is warm?
10ºC
9ºC
8ºC
11ºC
What is the purpose of a hot flush in a central heating system?
To remove debris from the installation process
To remove hydrogen from the system
To remove excess jointing compounds
To remove excess flux residues and oils
What is the purpose of a power flush in an older central heating system?
To remove debris from the installation process
To remove hydrogen from the system
To remove excess jointing compounds
To remove blockages in the system
A heating system which relies completley on natural convection to work would be better known as......
Semi gravity
Fully pumped
Full gravity
C plan
This type of system is known as a.........
Fully pumped system
Semi gravity system.
Diverter valve system.
Zone valve system.
Building Regulations Approved Document L1A refers to what?
Energy efficiency for new build properties
Enegry efficiency in older properties.
Energy efficiency for central heating systems.
Energy efficiency in hot water systems.
The 'bar' is used to measure what?
Atmospheric pressure
Water pressure
System pressure
Head of pressure
The purpose of this is to ....
Allow for the expansion of the system pipework
Allow for the expansion of the water in the system
Allow for the expansion of steam in the system
Allow for the expansion of the air in the system
The type of system a Honeywell 'S' plan is....
3 port mid position valve
3 port diverter valve
2 x 2 port zone valves
3 x 2 port zone valves
A diverter valve system
Gives central heating priority
Gives hot water priority
Gives heating and hot water the same priority
Gives a mixture of central heating ans hot water priority
A 'heat leak' radiator is used to .......
Remove excess heat from the room.
Allows more heat to come off the radiator.
Remove excess heat from the system to prevent 'venting over'
Remove excess heat from the system to prevent pipework from expanding too much.
This type of fitting would be on a ......
Small bore only system
Small bore to microbore system
Multi pipe system.
One pipe system.
How high should the open vent pipe on a central heating system extend?
150mm above the water line
250mm above the water line
350mm above the water line
450mm above the water line
To calculate the height above the pump the F&E cistern should be installed we.....
Divide the minimum head of the pump by 3
Divide the medium head of the pump by 3
Combine the minimum and maximum head of the pump and divide by 3
Divide the maximum head of the pump by 3
Yoou would find the neutral point in a system at....
The boiler
The last tee cylinder return at the boiler
The pump
Where the cold feed enters the central heating system
The open vent and cold feed in a fully pumped system should not be installed further than........
100mm apart
125mm apart
150mm apart
175mm apart
This fitting is called........
Anti gravity valve
Cytrol valve
Air seperator
Water seperator
This type of heat emitter is known as......
Towel rail
Skirting heater
Radiator
Column radiator
The valve is
Anti gravity valve
Cytrol vale
2 Port valve
Auto bypass valve
This condition shown is known as
Steaming
Venting
Pluming
Cooling
An F&E cistern need to comply with Byelaw 30
True
False
The purpose of fitting a bypass valve is to
Allow water to circulate through the radiators after the motorized valve has closed.
Allow water to circulate between the flow and return from the boiler after the motorized valve has closed.
Allow water to circulate through the cylinder after the motorized valve has closed.
Allow water to circulate through the boiler to balance the system.
Which of these is the correct order for the 3 Tee rule
cold feed, open vent, cylinder return
Cylinder return, cold feed, open vent
open vent, cold feed, cylinder return
open vent, cylinder return, cold feed
The water in a central heating system will expand by...........
14%
Not at all
10%
4%
The type of flue shown in the picture is known as..
Natural draught
Conventional flue
Fan assisted flue
Natural draught balanced flue
The deposit on the inside of the pipe shown is..........
Black sludge
Iron oxide
The black gunge
Copper oxide
This device is to......
Control the temperature of hot water
Control the temperature of central heating
To stop the system from freezing
Control the temperature of the boiler
The name given to the series of controls which shuts down the system completely is .........
System control locking
Boiler control lock
Boiler interlock
Interlocking boiler
What is the measurement of the U-value?
w/m²K
kj/m°C
w/kg/K
J/m³/K
What are the likely effects of oversizing a heating system?
Reduced energy usage, as systems produce enough heat quickly before shutting off for longer periods
Reduced life expectancy of heat emitters, which often overheat due to higher temperatures
Greater risk of burns/scalds, due to excess temperatures within the system and increased boiler combustion efficiency
Reduced energy efficiency, as boilers ‘hunt’, and greater initial outlay costs
What is the most suitable external design temperature for a house with normal sheltered exposure in England and Wales?
-1°C
-3°C
-4°C
-5°C
What is the correct formula to determine the heat loss through a surface such as a wall or window?
m² x Δt x 1.33
m² x Δt x U-value
m³ x QTY x Δt 0.33
m³ x U-value x QTY x 3
What is the term given to the radiator within a central heating system which is the furthest from the heat source?
The content circuit
The shunt circuit
The hydraulic circuit
The index circuit
What is the purpose of a hot flush of the central heating system?
To remove excess limescale deposits from the system
To ensure that the system flow rates can be achieved throughout the installation
To remove traces of the legionella bacteria from the system pipework
To remove excess jointing compounds, fluxes and oils from the system
A radiator has stopped working and is completely cold. All the other radiators in the system are hot and no air is present in the cold radiator. What is the most likely problem?
Pin stuck within TRV
Sludge blocking parts of the radiator
Faulty pump
System needs balancing
