WorksheetsHeating System Quiz
Total questions: 46
Worksheet time: 23mins
Which British Standard covers the method for the calculation of design heating loads?
BS EN 12828:2003
BS EN 12381:2003
BS EN 14336:2004
BS EN 1264-1:1998
What is the measurement of the U-value? Remember this measurement for your exam!
w/m2K
kj/moC
w/kg/K
J/m3/K
What is the correct formula to determine the heat loss from a space through air changes and ventilation? Remember this formula for your exam!
m2 x Δt x 1.33
m2 x Δt x U-value
m3 x QTY x Δt x 0.33
m3 x U-value x QTY x 3
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?
-1oC
-3oC
-4oC
-5oC
What is the correct formula to determine the heat loss through a surface such as a wall or window? Remember this formula for your exam!
m2 x Δt x 1.33
m2 x Δt x U-value
m3 x QTY x Δt x 0.33
m3 x U-value x QTY x 3
A radiator has a temperature of 70oC at the inlet and 50oC at the outlet. What is the maximum water temperature of the radiator?
20oC
40oC
50oC
60oC
You are trying to determine the correct size of an expansion vessel for a typical domestic central heating system. The system is installed in 22mm and 15mm copper. Which of the following methods could be used to give an approximate system volume?
2 litres per kW of the boiler
4 litres per kW of the boiler
6 litres per kW of the boiler
10 litres per kW of the boiler
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 formula used to determine the flow rate for a circuit? Remember this formula for your exam!
kg/s = kW / 4.19 x Δt
W = kg x SHC x Δt
kW = 4.19 / kg x 1.33
Litres = kW x SHC / Δt
According to BSEN 14336:2004, what is the minimum test pressure and period for a water-based heating system?
At least 30% greater than the working pressure for a minimum of one hour
At least 30% greater than the working pressure for a minimum of two hours
At least 1.5 times the working pressure for three hours
At least 2 times the working pressure for one hour
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
What is not an effect of good balancing within a central heating system?
Increased efficiency at the boiler
Reduced fuel costs
More even radiator temperatures
Higher calorific value of the fuel
Which component is initially used to balance the heat outputs at radiators?
Wheel head valves
TRVs
Lockshield valves
Pump speed controller
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
Which of the following components can be used to check the charge pressure of an expansion vessel?
Pressure gauge at the boiler when the system is hot
Tyre pressure gauge when the system is hot and the vessel full
Pressure gauge on the boiler when the system is cold
Tyre pressure gauge with the vessel disconnected from the central heating system
A central heating boiler fires on demand for heating. The flame is established for a second or two before 'locking out'. What is the most likely fault?
Ignition electrode failed
Rectification probe failed
Air pressure switch stuck in the open position
Gas valve solenoid burned out
A customer reports that she needs to top up the boiler regularly but cannot see any signs of leakage. All pipework from the combination boiler is visible and no signs of leaks are present. You have noticed signs of water at the pressure relief valve discharge pipe outlet. What is the most likely cause of the pressure loss?
Boiler pressure gauge is malfunctioning
Both check valves at the external filling loop are passing and the system is backflowing into the cold main
The cylinder coil has failed, leading to central heating water leaking into the secondary water
The expansion vessel has ruptured
You have been called to an old open vented system which has a pumped heating circuit and a gravity hot water circuit. The radiators are cold but the hot water is hot, despite the controller being switched to heating and hot water. No zone valves are installed. What is the most likely cause of the fault?
Failure of boiler thermostat
Failure of circulating pump
Failure of synchron motor
Failure of cylinder thermostat
What heating system uses a difference in the density of water to circulate heat to a hot water cylinder?
Y plan
Gravity fed
S plan+
Hypocaust
The conservation of fuel and energy is covered by which approved document?
Building regulations part P
Building regulations part M
Building regulations part H
Building regulations part L
What is the main purpose of a central heating system?
To heat up the core of the building
To provide thermal comfort to a property
To supply heating to a single room
To provide heat to a number of properties
What is at the highest point of a vented heating system?
Expansion vessel
Feed and expansion cistern
Cold feed isolation valve
Automatic air vent
What is the primary function of the open vent on a central heating system?
To allow the system to pressurise
To allow the system to operate at atmospheric pressure
To provide sufficient oxygen to the heating system
To provide a means of ventilation when filling the system
What type of heating system incorporates a three-port valve that gives priority to the hot water system?
S plan
S plan+
Y plan
W plan
What three components are required when converting an open vented system with a sealed system?
Automatic air vent, low loss header, filling loop
Filling loop, expansion vessel, pressure gauge
Pressure relief valve, filling loop, expansion vessel
Expansion vessel, automatic air vent, pressure gauge
What type of heating system charges using low-cost off-peak tariffs?
District
Electric storage
Y plan
Warm air
What type of heating system can be split into zones that serve a cluster of houses and buildings?
District
Underfloor
Microbore
Thermosyphon
Which one of the following Building Regulations discusses the control of heating systems within new-build dwellings?
Part L1a
Part L1b
Part L2a
Part L2b
Which one of the following describes the purpose of background heating?
Heat the property quicker than full central heating
Heat only certain rooms in the property, as required
Heat the property to a lower temperature than full central heating
Heat the property to a higher temperature than full central heating
An automatic bypass valve is activated by which of the following?
Boiler shutting off
Programmer being switched on
Pressure created within the system
Pressure of the incoming water service
The main reason a radiator should be installed 150mm above floor level is to?
Reduce the risk of fire
Allow the heat to circulate
Protect the flooring from possible leaks
Allow easier access for maintenance work
A thermostatic radiator valve opens and closes as a result of the temperature of the?
Primary circuit
Boiler
Space it’s installed in
Return pipework
A pump should be positioned so that the heating system is operating under?
No pressure
Positive pressure
Negative pressure
Both positive and negative pressures
An automatic air vent should be positioned at the?
Highest part of the system
Lowest point of the system
Point where the vent enters the system
Point where the cold feed enters the system
Which one of the following central heating systems uses a manifold?
One-pipe system
Two-pipe system
Microbore system
Gravity pipe system
Installing an air separator allows which one of the following to take place?
Close coupling of the cold feed and vent connections
Close coupling of the flow and return connections
Close coupling of the pump and the vent connections
Close coupling of the motorised valve connections
The minimum size for an open vent pipe is?
15mm
22mm
28mm
35mm
Which one of the following is the best installation position for a cylinder thermostat?
¾ down from the top of the cylinder
⅓ down from the top of the cylinder
¼ up from the bottom of the cylinder
⅓ up from the bottom of the cylinder
Which port is the central heating flow connected to on a mid-position valve?
A
B
AB
BA
In a central heating installation, the primary pipework connects the?
Boiler and the cylinder
Cylinder and the outlets
Cylinder and the radiators
Feed cistern and the cylinder
Condensing boilers are specifically designed to?
Provide stored hot water
Extract less heat from the flue gases
Extract more heat from the flue gases
Provide hot water at low temperatures
By which one of the following processes do radiators give out 70% of their heat?
Conduction
Convection
Radiation
Emission
Separate space heating zones are required in dwellings where the floor area is greater than?
150m²
180m²
200m²
500m²
Which one of the following types of valve would you commonly find in a Y-plan system with no bypass?
Three-port diverter valve
Zone valve
Two-port valves
Three-port mid-position valve
A district heating system is feeding a number of high-rise flats. Hydraulic separation is required – how is this achieved within each flat?
Heat recovery unit
Ground source heat pump
Heat interface unit
Air source heat pump
