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WorksheetsLevel 2 Plumbing - Hot Water
Total questions: 43
Worksheet time: 36mins
What are two things that WRAS does?
Publishes the water regulations guides
Lists approved fittings
Controls the water supply
Offers guidance
What is centralised hot water system?
When water is heated and/or stored centrally in the building and is distributed from that point to all hot water outlets
When water is heated and/or stored locally to one specific draw-off point area
What is a localised hot water system?
Where water is heated and/or stored locally to one specific draw-off point area.
Where water is heated and/or stored centrally in the building and is distributed from that point to all hot water outlets.
What gives an open vented system it's working pressure?
The head height of the CWSC
The flow rate
The size of the pipe
The temperature
BS6700 states that an open vent must be a minimum of ____ and have no valves in it
15mm
22mm
28mm
32mm
The hot distribution pipe should be a minimum of _____ long before it connects to the vent pipe
450mm
650mm
22mm
350mm
The primary function of the vent pipe is to act as a what?
Safety device
Temperature control
Cooling device
Stop tap
What is a single feed system?
The single feed system uses a primatic cylinder which relies on an air bubble to separate the primary and secondary waters
The single feed system uses an indirect cylinder, and the primary and secondary waters are separated by a coil. The primaries are filled from the F&E and the secondaries are filled from the CWSC
What is a double feed system?
A double feed system uses an indirect cylinder, and the primary and secondary waters are separated by a coil. The primaries are filled from the F&E and the secondaries are filled from the CWSC.
A double feed system uses a primatic cylinder, which relies on an air bubble to separate the primary and secondary waters. Both are filled via a single feed pipe from the CWSC.
What are the main advantages of an indirect system?
Part L compliant
Various sizes of cylinders available
The system can be fully pumped
All the above
The water in a modern direct cylinder is commonly heated by what?
Immersion Heater
Electric heater
Multi-coil
Coil heat exchanger
The water in a modern indirect cylinder is commonly heated by what?
Coil heat exchanger
Immersion Heater
A boiler
Electric heater
If you wanted heat your water using a boiler and a renewable heat source, what would happen to the standard hot water cylinder fitted in the property?
Be replaced with a twin coil cylinder: one coil for the boiler and one for the RHS
It would be removed and replaced with a combi
Turned off
Not possible
What pressure do cistern fed showers require?
High
Low
Equal
In a cistern fed shower, both the hot and cold must be fed from the CWSC.
True
False
The minimum heat height required for effective operation in a cistern fed shower is...
1 metre
500mm
2 metres
38mm
A twin impeller pump will do what for a cistern fed with a booster pump?
Increase the pressure for both hot and cold
Increase the pressure for hot
Increase the pressure for cold
Reduce pressure
The feed from the hot water cylinder is often made via an ....
Essex flange
Copper pipe
Open vent
Stop valve
The connections from the pump to the pipework should be what?
Flexible
Secure
Steel
Vertical
The pump is operated by a... What?
Flow switch
Gate valve
Non return valve
On button
Mains fed showers are generally fed from a what?
Unvented cylinder, water jacket heater or combination boiler
Unvented cylinder
Water jacket heater
Combination boiler
Mains fed showers run at what pressure?
High
Low
Equal
Adjustable
A special valve may be required on a mains fed shower called a...
Pressure regulating/reducing valve
Stop valve
Isolation valve
Valve
What is flow measured in?
Litres per minute
Litres per hour
Litres per second
Millimetres per hour
If a flow rate was measured at 0.2 litres per second, how many litres per minute is that?
0.2 x 60 seconds = 12 litres per minute
0.2 x 60 seconds = 24 litres per minute
0.2 x 60 seconds = 60 Litres per minute
0.2 x 60 seconds = 1.2 litres per second
What could be the cause of an isolation valve passing water, even when closed off?
Limescale build up, debris or an O ring may be damaged
Not enough tape
Bolt needs tightening
Acidic water
What is the most likely cause of a creaking noise under floorboards in a house when they run hot water to the bath?
The notching of the joist to accommodate the pipes is incorrect
The pipes are too small
The pipes are missing clips
The water is too hot
BS6700 states that the velocity (flow rate) of the hot water should mot be too high or it could be heard in the pipework. What is that velocity?
2 metres per second
3 metres per second
4 metres per second
10 metres per second
What are common ways to overcome water hammer?
Inspect FOV and maybe replace tap washer
Install flow restrictor
Change to an equilibrium valve
Inspect clipping distances to make sure they are correct
The cylinder thermostat could fail in two positions; what would be the consequences of both? Pick two.
Fail in open position - No hot water at all
Fail in closed position - the hot water temperature would continue to rise.
The temperature not rise or drop. Causing uncertainty.
It could smash.
After a soundness test, What should take place to remove any debris and biological matter?
Flushing and disinfecting
Flushing
Disinfecting
Hand over to the customer
What chemical is used to disinfect a system?
Chlorine or sodium hypochlorite
Hydraulic acid
Limescale
Washing up liquid
How are plumbing companies assured that the component parts will be compliant with water regulations?
The components should be WRAS approved.
They are to ask before purchasing
They have a WRAS stamp
It will state in the manual
Which British standard should be referred to concerning good workmanship when installing a hot water system?
BS8000
BS6700
BS6450
BS7000
What size CWSC would you put in a loft an why?
230L to cope with both the hot and cold water supplies
150L to cope with both the hot and cold water supplies
1000L to cope with both the hot and cold water supplies
350L to cope with both the hot and cold water supplies
What is the function of the open vent over the cold water cistern?
To act as a safety relief if the system overheats, but it also allows for expansion and allows air out of the system
To resupply the CWSC with water when low
To stop bugs getting in
To allow for maintenance
Why aren't both vent pipes over the CWSC?
The primary is over the F&E and the secondary over the CWSC otherwise it would lead to contaminating the CWSC
Just because
Too much air would escape
Only 1 is required
Why is there a reset button on the immersion heater?
It is a legal requirement and Incase the thermostat fails
To allow for maintenance
To change the temperate
The configure routinely.
Why do all components in the airing cupboard need insulating?
Incase of freezing
Building regs part L requires all pipework up to 1 metre away from the cylinder to be insulated
Building regs part P requires all pipework up to 1 metre away from the cylinder to be insulated
Building regs part R requires all pipework up to 1 metre away from the cylinder to be insulated
A customer lives in a hard water area. What is the maximum cylinder stat setting that should be advised?
65°C otherwise limescale will start to form
60°C otherwise limescale will start to form
45°C otherwise limescale will start to form
70°C otherwise limescale will start to form
Between what temperatures is there a risk that legionella could grow?
20-46°C
20-30°C
5-15°C
45-50°C
A extension 15 metres away from the HWSC is being made. They need hot and cold water supplies to that room. 15 metres would mean the supply became a dead leg. what do you suggest?
Secondary circulation could be installed or localised heater installed
Pipework going towards the extension
Another HWSC
A combi
In a loft conversion, what type of water heater would be needed?
Gravity appliance
Mains fed instantaneous heater in the loft
Immersion
Electrical
