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WorksheetsPlumbing Level 2 - Central Heating
Total questions: 41
Worksheet time: 21mins
The British Standard for the design of water based heating systems is:
BS 6700
BS EN 12828
BS EN 12058
BS 9001
1. 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 are low pressure open vented systems?
Fed from a feed and expansion cistern located at high level. These can be fully pumped or gravity systems.
Fed directly from the mains cold water and incorporate an expansion vessel to take up the expansion of the heated water.
A more modern, fully pumped system
Combination boiler system
What are pressurised sealed systems?
These are fed directly from the mains cold water and incorporate an expansion vessel to take up the expansion of the heated water. This type is more modern, fully pumped, or combination boiler system.
Low pressure systems, fed by gravity systems
systems with high amounts of unwanted pressure build up
Systems that try avoid pressure
This component is called the:
Feed and expansion cistern
HWSC
Boiler
Which part of the system is this located?
Highest
Lowest
The main purpose of this item is to allow for:
Expansion
Cheap installation
Easy access to water
Central Heating
The flow of water to this item is controlled by a:
Float operated valve
Warning pipe
Pre-set timer
22mm copper pipe
The expansion in an open vented system is around
5%
4%
25%
14%
What is the primary function of the open vent pipe on a central heating system? Pick two.
To provide a safety outlet, should the system overheat
To allow the system to operate at atmospheric pressure
To allow for water intake
To stop rodents/debris entering the system
1. According to British Standards, what must not be installed on the open vent pipework?
Valves
Elbows
Drain-offs
tees
What type of system is this?
One pipe system
Two pipe system
Open vented system
Closed vent system
What is a disadvantage of this type of system?
The radiators progressively get cooler, the further round the system they are
Expensive to install
Require lots of maintenance
What type of system is this?
One pipe system
Two pipe system
Open vented system
Closed vent system
What are the advantages of a two pipe system over a single pipe system?
All heat emitters reach the same temperature
Two pipe system is quicker when heating up
This system is cheaper to run
This system is cheaper to install
What pipe is missing from this system?
Open vent pipe
Closed vent pipe
Warning pipe
Radiator pipe
What is a S plan system?
This system uses one zone valve to control the hot water, which is activated by the cylinder thermostat; and a second zone valve which is activated by the room thermostat. The zone valve acts as an isolator, closing the flow of water off.
This system has a three port mid-position valve that controls the flow of water to the hot water cylinder and heating circuit. The valve reacts to the room thermostat and cylinder thermostat.
What is a Y plan system?
This system has a three port mid-position valve that controls the flow of water to the hot water cylinder and heating circuit. The valve reacts to the room thermostat and cylinder thermostat.
This system uses one zone valve to control the hot water, which is activated by the cylinder thermostat; and a second zone valve which is activated by the room thermostat. The zone valve acts as an isolator, closing the flow of water off.
What safety devices does a sealed system have that an open vented system does not have? Pick two
Expansion vessel to take up the expansion in the heated water
Pressure release valve allows excess system pressure to be discharged
Double check valves
Inbuilt thermostat
The Water Regulations state that the filling loop on a sealed system needs to be disconnected after the system has been charged to the correct pressure. How does the Water Regulations require the mains to be protected whilst the filling loop is connected?
Double check valve fitted on the mains side of the loop
Single check valve fitted on the mains side of the loop
Tripple check valve fitted on the mains side of the loop
Stop valve fitted on the mains side of the loop
Disadvantages of a one pipe gravity system - Select all that apply
Each radiator progressively cools down
Only the main ring is pumped
Uncontrolled room temperature
Boiler could cycle &
Boilers connected to these systems are low efficiency
Not compliant to Building Regulations part L
Advantages of a two pipe gravity system are:
All heat emitters reach the same temperature
Two pipe system is quicker when heating up
Cheaper to run
Disadvantages of a two pipe gravity system:
Uncontrolled heat
Boiler cycling
Not compliant to building reg Part L
Boilers connected to these systems are low efficiency
What are the advantages of a C plan plus system?
All heat emitters reach the same temperature
Two pipe system is quicker at heating up
Compliant to Building Regulations L1b
Full control on heating and hot water
What are the disadvantages of a C plan plus system, pick two.
Not fully pumped
Boilers fitted to this system tend to be lower efficiency
No control of heating
No control of hot water
Advantages of a S plan fully pumped system are:
Compliant to Building Regulations L1a and L1b
Full control of heating and hot water
Two pipe system is quicker to heat up
All heat emitters reach the same temperature
Usually fitted with condensing HE boilers
Disadvantages of a S fully pumped system are: pick 2
Expensive to install
Retro-fit could be disruptive to the customer
Cheap to install
Noisy
What is this?
Circulator
Pump Flange
Room thermostat
Programmer
What is this?
Circulator
Pump Flange
Room thermostat
Programmer
What is this?
Circulator
Pump Flange
Room thermostat
Programmer
What is this?
Circulator
Pump Flange
Room thermostat
Programmer
What is this?
Inhibitor
Pressure relief valve
Cylinder thermostat
Programmer
What is this?
Inhibitor
Pressure relief valve
Cylinder thermostat
Three port mid-position valve
What is this?
Inhibitor
Pressure relief valve
Cylinder thermostat
Automatic bypass valve
What is this?
Inhibitor
Pressure relief valve
Cylinder thermostat
Filling loop
What is this? On a sealed system this takes up the 4% expansion of the primary waters
Inhibitor
Pressure relief valve
Cylinder thermostat
Expansion vessel
What is this? This allows hot water and the heating circuits to be controlled separately
Inhibitor
Pressure relief valve
Cylinder thermostat
Two port motorised valve
What is this? A chemical protection against scale and corrosion within a central heating system.
Inhibitor
Pressure relief valve
Cylinder thermostat
Pump flange
What is this? Contains a magnet that collects all the corroded iron particles – magnetite
Inhibitor
Pressure relief valve
Magnetic system cleaner
Pump flange
What is this? · This valve replaces the wheel head valve, allowing the customer to control the temperature of a single radiator. Within the head there is a sensor containing a liquid which expands when heated.
Inhibitor
Pressure relief valve
Thermostatic radiator valve (TRV)
Pump flange
What is this? Used on sealed systems to relieve the system of built-up pressure if the expansion vessel fails.
Inhibitor
Pressure relief valve
Pressure relief valve
Pump flange
