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WorksheetsDomestic Hot Water 6035-02 | Part 3
Total questions: 40
Worksheet time: 20mins
Which of the following is a disadvantage of having an unvented cylinder?
Works on mains pressure
No need for space for CWSC
High maintenance
Good flow rates
What British standard covers the Design, installation, testing and maintenance of hot water?
BS8000
BS6700
BS1212
BS1200
STATEMENT: You can work on a gas boiler without being gas safe, as long as you notify the Local Authority after work is complete.
True
False
What British standard covers the sizing of the cold feed pipe?
BS6700
BS1212
BS8000
BS6701
What is the allowance for 'pressure drop' during plastic pipe test B soundness test upon inspection?
No drop allowed
Maximum of 1 bar
Minimum of 0.2 bar
Test bucket should be on 0.0 bar on inspection
Which of the following would you most commonly find in an older property?
Centralised open vented indirect with pumped primary
Centralised open vented indirect gravity system
What is the minimum size of the vent pipe?
28mm
25mm
22mm
15mm
What are the two materials cylinders are commonly made with? (Choose 2)
Copper
Brass
Polyethylene
Stainless steel
Which of the following components are NOT required when installing an unvented under sink storage heater?
Discharge pipe
Float operative valve
Single check valve
Expansion vessel
Why is there a minimum of 450mm of pipework from the exit of the cylinder and the open vent tee?
Prevents contamination
Prevents one pipe circulation
Prevents backflow
Prevents loss of head height
STATEMENT: The limescale insulates the water from the heat source, resulting in a higher heat-up requirement.
True
False
What tool is used to tighten or release an immersion heater?
Adjustable spanner
Water pump pliers
Immersion vice
Immersion spanner
What is the component shown?
Weir cup
Pressure gauge
Limescale level reader
Coffee cup
STATEMENT: Grey water harvesting should ALWAYS be connected to the mains supply in case of a shortage of supplied water.
True
False
A disadvantage to having a combination unit installed is?
Lack of head height
Heat transfer
Difficult to install
Expensive to install
The blending valve should be located?
As close as possible to outlets
As soon as possible from the cylinder
On the hot pipe only
On the cold pipe only
BS8000 pt.15 states that if there is any possibility of heat transfer the pipe should be?
Corrected
Removed
Insulated
Clipped
What grows in the water if the water fluxuates between 20°-46°C?
Limescale
Legionella
Faecal
Algae
BS6700 states the maximum length of pipe before it becomes a dead leg for 12 - 22mm is?
3M
6M
8M
12M
Which one of the following is NOT a type of cylinder?
Multi-coiled
Double feed
Un-lagged
Multi-lagged
STATEMENT: The pump should be positioned as close to the appliance as possible, as the pump is pulling the water.
True
False
Which of the following can be done to prevent water hammering?
Installing flow restrictor
Change FOV to an equilibrium valve
Correctly clipping pipework
All of the above
If the CWSC feeds hot and cold, the minimum size is ______ litres.
100L
115L
230L
250L
What should be considered before suggesting a type of system to a customer?
Storage capacity
Fuel type
Cost of installation
All of the above
What type of system is shown here?
Instantaneous electric shower
Cistern fed shower
Unbalanced fed shower
Cistern fed with booster pump shower
If the air bubble in a single feed cylinder is continuously lost, what fault could have occurred?
Fault with the boiler
Fault with the chamber
Fault with the open vent
Fault with the cold distribution
What material is a 'sacrificial anode' made of in the bottom of cylinders?
Lead
Copper
Magnesium
Stainless steel
What is defined as 'water heated on demand when outlets are opened'?
Localised
Stored
Instantaneous
Direct
In accordance with BS6700, what should NOT be present when flushing the system after disinfecting ?
Limescale
Water
Debris
Chlorine
Which of the following is a alternative way to heating water?
Over sink storage heater
Under sink water heater
Unvented under sink storage heater
All of the above
Which of the following is a type of shower mixer valve?
Pressure balancing mixer valve
Thermostatic mixer valve
Manual shower mixer valve
All of the above
How far up the cyliner is the cylinder thermostat installed?
1/3
1/4
1/2
3/4
The reason for a slight rise in the hot distribution pipe to the vent pipe connection is to?
Prevents contamination
Increase system pressure
Prevent legionella
Prevent airlocks
Which of the following would be a factor to a component leaking?
Pipework previously froze
Insufficient insulation
Incorrect installation
All of the above
What means of heat transfer does the direct cylinder to the bolier rely on?
Radiation
Convection
Conduction
Electrolysis
What type of system is a combination boiler considered?
High pressure system
Low pressure system
Which of the following is a disadvantage of having 'stored water'?
The customer has a secondary heat source
A back-up supply of water if the mains is cut off
Suitable for areas with low water pressure
Takes up more space than a driect system
During a soundness test, what pressure should the installer test the pipework at?
The exact working pressure
1/3 of working pressure
1.5 times the working pressure
4 times the working pressure
Public areas set the hot water to not exceed what temperature?
40°C
43°C
47°C
50°C
What does placing the cylinder on top of pieces of wood prevent?
Condensation
Stagnation
Difficulty moving the cylinder
Heat loss through the floor
