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WorksheetsProgression hot water revision 1
Total questions: 25
Worksheet time: 13mins
Which one of the following pieces of information will be provided by the installation plan?
The dwelling position on the estate
The expected completion date
The order in which work should take place
The position of the hot water pipes and valves in a dwelling
The water supply (water fittings) regulations 1999 lay down:
The regulations covering all internal and external hot and cold water systems for dwellings
The guidance for good practice when installing hot and cold pipework in a dwelling
The regulations that cover hot water systems only
The guidance for internal hot and cold water systems only within a dwelling
Which one of the following hot water components should be fixed using flexible connections?
Indirect hot water cylinder
Shower mixer valve
Booster pump for a shower
External bib tap
A rigid pipework hot water system has a working pressure of 4bar. At what pressure should the pipework be tested for soundness?
1bar for 60 minutes
1½ times the working pressure for 15 minutes
6bar for one hour
4bar for 30mins then 6bar for 15 minutes
To prevent electrolytic corrosion taking place in a system, where can the magnesium rod be placed?
The cold water storage cistern
The hot water cylinder
The circulator
The open vent
Guidance on the installation procedures for domestic hot water systems can be found in:
Domestic Water Act 2007
Specification of work
BS6700
Local Authority Regulations
In a customer's property, the CWSC supplies both the hot and cold water systems. The minimum size of this cistern is:
Equal to 48 hours' worth of water
230 litres
100 litres
Twice the size of the domestic hot water cylinder.
Which of the following appliances is most likely to offer the customer low pressure at a hot water outlet?
Combination boiler
Direct cylinder
Combination unit
Indirect cylinder.
What is this item?
Pressure/temperature relief valve
Double check valve
Stop valve
Blending valve.
If hard water is allowed to be heated above 65°C, what could be the consequence in the system?
Legionella could grow
The blending valve would fail to work
The pressure relief valve would open
The efficiency could be affected by limescale.
To overcome a dead leg for a hot water draw-off point, what course of action could be taken?
Install secondary circulation
Install a more powerful circulator
Increase the size of the hot water cylinder
Increase the temperature on the cylinder thermostat.
What is used at a basin outlet to prevent contamination of the water system?
AUK2 air gap
AUK3 air gap
AG air gap
AUK4 air gap.
A customer has intermittent flow of hot water from their bath tap – what is the most likely cause of the problem?
Too little head pressure
Too much head pressure
Air lock
Faulty float operated valve.
What is the primary function of the open vent on a domestic hot water system?
Safety relief pipe
Take up a hydraulic shunt
Allow hot water to be distributed at a controlled pressure
To balance the feed from the CWSC
To prevent the risk of legionella forming in a dead leg it should be:
No longer than 2.5 metres, as stated in BS6700
Disinfected annually under a PPM program
As short as possible
Always heated to above 50°C.
What type of shower is this?
Instantaneous electric shower
Thermostatic bar mixer type
Gravity fed shower
Bath mixer shower.
Identify one advantage of a stored hot water system in a domestic property.
There is a continual supply of hot water
It is cheaper and easier to install
It does not require a secondary source of heat
It is suitable for low water pressure areas.
Which one of the following heat sources is regarded as a renewable source of energy?
Coal in a solid fuel boiler
Gas in a condensing boiler
Solar panels on the roof of a property
Electricity supplying an immersion heater.
Where would state the maximum flow rate and temperature for a particular pumped shower that has been installed?
BS6700
The Water Regulations
The manufacturer’s instructions
Building Regulations part G.
Under Building Regulations part G, what is a new or replacement immersion heater required to have?
Temperature relief valve
Non-resetting overheat thermostat
Restricted thermostat to a maximum temperature of 60°C
Protective coating to avoid electrolytic corrosion.
Which of the following cylinder types is a direct cylinder?
A
B
C
The connection for a secondary circulation system return should be made at what point in the hot water cylinder?
Bottom third of the cylinder
Top third of the cylinder
Middle point of the cylinder
Just prior to the open vent connection.
If a system is prone to limescale build ups, this shows:
The property is in a soft water area and the temperatures are set too high
The property is in a hard water area and the temperatures are set too high
The property has a gravity hot water system that requires upgrading
The water pressure in the system is too high and requires reducing.
If a flow switch on a pumped shower does not work, what would be the result?
The water temperature will remain too high
The water temperature will remain too low
The pump will not be activated by the electrics
The pump will have restrictive water flow.
Under the Water Regulations, what can category 2 water be described as?
Wholesome water
Water representing a slight risk to health
Wholesome water with its aesthetic qualities impaired
Water representing a severe risk to health.
