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WorksheetsL3 YR2 revision 5 (Heating)
Total questions: 60
Worksheet time: 30mins
Part L1b of the Building Regulations covers
The Water Supply (Water Fittings) Regulations 1999
Conservation of fuel and power in new dwellings
Conservation of fuel and power in existing dwellings
Conservation of fuel and power in new commercial dwellings
Heat producing appliances come under which part of the Building Regulations?
Part F
Part C
Part J
Part L
What is the maximum floor area of a dwelling before separate zones have to be introduced?
120M squared
100M squared
130M squared
150M squared
Which British Standard covers Heating systems in buildings?
BS EN 12828:2003
BS EN 442:2003
BS EN 806
Part G Building Regulations
Which of the following documents offers compliance advice and best practice for the installation of central heating systems?
Domestic Building Services Guide
CIPHE Heating Guide
BS EN 7593
Central Heating System Specifications (CHeSS) 2008
What type of valve should be fitted to the cold feed to an open vented heating system?
Gate valve
Stop valve
Lever operated valve
No valve to be fitted
If the flow temperature from a condensing boiler is 80 degrees. What temperature would you expect on the return when commissioning?
50 degrees
60 degrees
70 degrees
80 degrees
The S plan system has the following:
Room stat, cylinder stat, programmer 3 x two port valves
Room stat, cylinder stat, programmer 1 x two port valve
Room stat, cylinder stat, programmer 2 x two port valves
Room stat, cylinder stat, programmer 4 x two port valves
The function of a bypass is required for what?
Overheat protection of the hot water circuit
Overheat protection of the boiler
Overheat protection of the bi metallic strip
Overheat protection of the solonoid
What is the function of a wiring centre?
A technical help line
To order electrical cable and accessories
To enable all component wiring to be linked together
To make a spur connection to a system
Open vented systems contain a feed and expansion cistern which fulfills two functions which are:
It allows for overheat protection and temperature control for the heating boiler
It is to allow for a good flow and pressure to a thermostatic mixer valve
It allows space for the system water to expand to when it is heated and a means by which water enters the system for filling and top-up
It allows the water to overflow when fill valve fails and protects against system corrosion
What is the recommended capacity of an F & E cistern?
5 litres
18 litres
10 litres
32 litres
What is the purpose of an "Open vent" in regard to heating systems?
Provide a safety outlet should system overheat and ensures system remains at atmospheric pressure limiting boiling point to 100 degrees
Provide a safety outlet should system overheat and ensures system remains at atmospheric pressure limiting boiling point to 80 degrees
Provide a safety outlet should system overheat and ensures system remains at atmospheric pressure limiting boiling point to 50 degrees
Provide a safety outlet should system overflow and ensures system remains an intensity of pressure of 9.81 Kn/M2
In a fully pumped system the height of the open vent should be a minimum of ....? from the water level in the cistern to the top of the open vent pipe.
250mm
350mm
450mm
550mm
What is the name of the motor in a motorised valve?
Stirling
Syncron
Microswitch
Hybrid
Three port valve provide separate hot water and heating circuits, they include a mid position which allows...
Constant hot water demand
Reverse circulation
Reversed circuits
Shared flow
Under Part L Building Regulations heating systems must be
Fully Primed
Fully connected
Fully Pumped
Fully constricted
To convert an open system to a sealed system the following additional controls are required
Filling loop, pressure gauge, expansion vessel,
filling loop, expansion cistern, pressure gauge
expansion cistern, expansion vessel, pressure gauge
filling loop shock arrester, expansion vessel
Boiler interlock can be described as
Boiler on/off switch
Associated controls which prevents boiler firing when there is no demand
Associated controls which prevents boiler firing when there is high demand
Associated controls which prevents boiler firing when there is low demand
Time clocks are devices which are
Suitable for switching on multiple circuit
Suitable for switching on two circuit
Suitable for switching on one circuit
Suitable for switching on all circuits
The flow from a boiler is connected to which port on a three port valve
B
AB
A
CA
The B port of a three port valve is connected to which circuit?
Hot water
Heating
Boiler
Secondary circuit
A room thermostat should be fitted at a height of ....? from the floor
1m
1.5m
2m
2.5m
What is the function of a weather compensator?
As external temp rises the compensator increases the circulation temp of the flow from the boiler. The reverse occurs if weather gets warmer.
As external temp rises the compensator reduces the circulation temp of the flow from the boiler. The reverse occurs if weather gets colder.
It increase flow temp due to thermostats calling for heat.
It reduces the emissions from the twin walled flue
Which of the following is NOT an advanced heating control?
Optimum start
Delayed start
Weather complicator
Weather compensator
Choosing the correct controls is vital. Which of the following is NOT an advantage.
Reduced fuel bills
Improved energy efficiency
Improved boiler efficiency
Lower CO2 emissions
A good system of controls must ensure that the boiler does not operate unless there is a demand. This is known as
Boiler interlink
Boiler intergas
Boiler intercity
Boiler interlock
The open vent and cold feed pipe should be positioned on the flow from the boiler on the suction side of the pump with a maximum of ____mm between them.
100mm
120mm
140mm
150mm
What is meant by the neutral point?
A point in the system which remains positive
A point in the system which is neither positive nor negative
A point in the system which remains negative
A point in the system which is neither alkaline nor acidic
What is meant by the index circuit in a heating system?
The circuit with the least resistance
The circuit with the most resistance
The circuit with no resistance
The circuit with the most resilience
To which terminal does the grey wire connect from a mid position valve to a wiring centre?
3
5
7
9
What is the use of a proving unit?
To check the correct operation of hydraulic test equipment
To check the correct operation of hydrostatic test equipment
To check the correct operation of electrical test equipment
To check the correct operation of dynamic test equipment
A low loss header allows the creation of two separate circuits. These are:
Primary flow and primary return
Primary circuit and secondary circuit
Primary gravity flow and secondary return
To reduce system pressure and recharge
Why should an expansion vessel be fitted onto the return pipe?
Water is generally cooler and prevents legionella
Water is generally flowing faster and places less stress on the vessel
Water is generally warmer than flow and places more stress on the vessel
Water is generally cooler than flow and places less stress on the vessel
What is the function of a Schrader valve?
Allows air in or out with an air tight seal
Allows water in or out with an air tight seal
Allows the motorised valve to open when heat is called for
Allows the motorised valve to close when heat is called for
What is the name of the device which can be used to permanently connect heating systems to mains cold water?
Type EB backflow prevention device
Type BA backflow prevention device
Type CA backflow prevention device
Type CB backflow prevention device
What is the correct fluid category for central heating water?
Fluid category 1
Fluid category 2
Fluid category 3
Fluid category 4
Fluid category 5
A system by-pass is fitted to avoid?
overheat protection of the pump
overheat protection of the plate heat exchanger
overheat protection of the boiler
overheat protection of the boiler multifunctional valve
Which of the following is not a solid fuel?
Coal
Coke
Biomass
Natural gas
The appliance which extracts heat from one medium at a low temperature and transfers it to another at a high temperature is a
Heat pump
Water pump
Slave cylinder
Heat primer
A multi-functional gas valve incorporates the following components
thermoelectric safety shut off, reactor, solenoid valve, inlet test point.
filter, thermoelectric safety shut off, regulator, solenoid valve, inlet test point, burner test point pilot adjuster.
filter, thermometer, safety shut off, regulator, solenoid valve, inlet test point, flue test point, pilot adjuster.
filter, regulator, solenoid valve, outlet test point, burner test point pilot adjuster.
Which radiator connections are used in most domestic applications?
BBOE
BBA
TBOE
TBBO
What is the definition of "viscosity" when referring to heating oil?
The amount of heat given of per millilitre
The running time of the oil using Boyles law
How long a litre of oil will burn for
Means thickness of oil and time it takes for oil to flow over a set distance.
What are the three parts of an open flue?
Primary flow, birds nest, secondary flow
Secondary flue, terminal, primary flue
Liner, closure plate, cowl
Copex, backgutter, terminal
Which of the following is NOT a type of heat emitter?
Panel radiator
Column radiator
LST radiator
LAP radiator
Where would you recommend to fit a kick-space heater?
Bedroom
Utility room
Kitchen
Bathroom
Which of the following is NOT a common mechanical control used on domestic heating systems?
Wheel-head radiator valve
Thermostatic radiator valve
Auto air vent
Anti gravity valve
HepvO valve
What is velocity?
The measurement of the height (head) at which an object changes its position
The measurement of the rate at which an object changes its position
The SI unit to measure flow
The SI unit to measure pressure
What is the function of an anti-gravity valve?
Prevents unwanted deadlegs
Prevents unwanted gravity circulation to upstairs radiators
Prevents unwanted gravity circulation to downstairs radiators
Prevents unwanted flashbacks
What are the correct design temperatures for underfloor heating under concrete floors and timber floor construction?
40-45 degrees for concrete and 50-60 degrees for timber floors
20-35 degrees for concrete and 40-50 degrees for timber floors
30-35 degrees for concrete and 40-45 degrees for timber floors
50-60 degrees for concrete and 60-70 degrees for timber floors
When designing an underfloor heating system consideration needs to be given to the thermal resistivity of floor coverings. This is expressed as _______ rating.
LOG
COG
BOG
Which would be the ideal method of laying underfloor heating pipes under hardwood floors or vinyl tiles?
Snail pattern
Series pattern
Parallel Pattern
Plumbers Pattern
Hot flushing of a heating system is to remove what?
installation debris
jointing compound, flux residue and oils
silicone compound, sawdust and oils
medicine compound, plumbers mait and debris
A heating system is balanced to ensure what?
Flow and return temperatures are the same
Even pressure distribution to all heat emitters
Flow and return temperatures have a minimum differential of 50 degrees
Even, heat distribution of heat to all heat emitters
Fault: system discharging water from the feed and expansion cistern overflow when heating up. Find the solution.
Increase the water level and reset the FOV to shut off at a higher level.
Bend arm of FOV until water stops discharging
Lower the water level and reset the FOV to shut off at a lower level.
Reduce flow to FOV by closing service valve slightly
Which of the following is NOT a sealed heating system component?
Expansion vessel
Expansion relief valve
Type CA disconnector
Pressure gauge
Type AA non mechanical backflow prevention device
Which is the correct configuration for an open vented system pipework?
Thumb air vent, filling loop, air separator and expansion vessel
Vent, feed, pump, by-pass and motorized valve
Automatic air vent, feed and expansion cistern, motorized valve
Feed, pump, vent, motorized valve and by-pass
Every radiator MUST be fitted with a thermostatic radiator valve.
True
False
Where would a low loss header typically be used?
On emitters that contain multiple zones and different system layouts
To compensate for water loss within the system
On systems that contain zones and different sized heat emitters
On systems that contain multiple zones and different heat emitters
What does the acronym ChESS stand for?
Central Heating System Specification
Careful handling every system size
Coal heating equals system sort
Charles heat every solid substance
