Components used in domestic hot water system
Presentation
•
Construction
•
Vocational training
•
Hard
Colin Allen
FREE Resource
47 Slides • 34 Questions
1
2
3
4
Multiple Choice
Which of the following is a current method for heating water in a direct cylinder?
Directly from the boiler
Via an immersion heater
Using a heat exchanger coil
Using solar panels
5
6
Multiple Choice
Which components are involved in the heating process of a direct cylinder as shown in the diagram?
Immersion heater, thermostat, cistern, primary flow pipe
Coil type heat exchanger, boiler, cold feed cistern, vents
Solar panel, expansion tank, pump, radiator
Gas burner, pressure valve, outlet pipe, filter
7
8
Fill in the Blanks
Using a direct cylinder means the system only requires one
Type answer...
9
10
Open Ended
Explain the main differences between direct and indirect cylinders in terms of their heating mechanisms and water separation.
11
12
Multiple Choice
What is the function of the coil type heat exchanger in an indirect cylinder system?
To heat the primary water directly
To separate primary and secondary waters and transfer heat
To store cold water for the system
To control water pressure in the cylinder
13
14
Open Ended
Describe how the double feed system in indirect cylinders works and why two cisterns are needed.
15
16
Multiple Choice
Which type of cylinder uses a basic form of heat exchanger and fills the primaries at the same time as the CWSC?
Prismatic cylinder
Unvented cylinder
Hot water cylinder
Indirect cylinder
17
18
Open Ended
Explain the difference in feed source between prismatic cylinders and unvented cylinders.
19
20
Multiple Choice
Which of the following statements about unvented cylinders is correct?
They operate under mains pressure and do not require a CWSC in the loft.
They have an open vent and require a CWSC in the loft.
They are always pre-pumped.
They can only be heated directly.
21
22
Fill in the Blanks
Hot water cylinders in a standard system will only be fitted with one coil, which is heated by the
Type answer...
23
24
Multiple Choice
What are the options for additional coils in hot water cylinders to link other heat sources?
Triple coil and quad coil
Single coil and double coil
Copper coil and steel coil
Indirect coil and direct coil
25
26
Open Ended
Discuss the importance of insulation and material choice in modern hot water cylinders, referencing Building part L requirements.
27
28
Multiple Choice
How can the heat recovery time in hot water cylinders be reduced?
By increasing the size and surface area of the coil
By decreasing the temperature of the water
By using less water
By adding more insulation
29
30
Open Ended
Explain the role of a sacrificial anode in hot water cylinders and why it is important, especially in soft water areas.
31
32
33
Fill in the Blanks
The cylinder has a thermostat that regulates the domestic hot water temperature. This is placed
Type answer...
34
Multiple Select
Which components are responsible for regulating water temperature in both the boiler and the cylinder?
Thermostat
Sacrificial anode
Immersion heater
Pressure valve
35
36
Open Ended
Compare the function and placement of immersion heaters in direct and indirect hot water cylinders.
37
38
Multiple Choice
What is the legal requirement for immersion heaters regarding the reset button, and why is it important for safety?
It must be non-self-resetting
It must be automatic
It must be located outside the heater
It must be resettable by remote control
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40
Multiple Choice
Which component in an immersion heater is responsible for controlling the water temperature?
Immersion element
Thermostat
Thermostat housing tube
Immersion cover and lock nut
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42
Multiple Select
Which of the following are controlled by a stat in a domestic hot water system?
Boiler
Immersion heater
Hot water temperature
Tap water pressure
43
Open Ended
Explain how the control of hot water temperature is achieved in a domestic heating system. Refer to the roles of different stats mentioned.
44
45
Fill in the Blanks
As domestic hot water heats up, the liquid inside the phial
Type answer...
46
47
Multiple Choice
According to Building Regulations part G, what is the maximum temperature hot water delivered to a bath should not exceed?
38°C
48°C
100°C
46°C
48
49
50
Multiple Choice
At what temperature and above will legionella bacteria be killed off in domestic hot water systems?
20°C
38°C
47°C
100°C
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53
Multiple Choice
What are the different types of corrosion in plumbing?
Chemical corrosion,
Temperature corrosion
The different types of corrosion in plumbing include galvanic corrosion, pitting corrosion, and erosion corrosion.
Rust corrosion,
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56
Multiple Choice
What is the purpose of a sealed expansion vessel in a sealed heating system?
To isolate the flow of water
To prevent lock out and prolong circulator life
To control the flow of water to the hot water cylinder
To accommodate the increase in volume as the water heats up
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59
Multiple Choice
When particles become hotter, they tend to move...
Slower
Faster
At the same rate
Backwards
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61
62
Multiple Choice
When would a mirror screw be used on?
Toilet
Bath panels
Basin
Radiator
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65
Multiple Choice
What symbol is shown here?
Service valve
2-port zone valve
Double check valve
Gate valve
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68
Multiple Choice
69
70
Multiple Choice
When removing floorboards, where possible you should cut:
Cut over the joists
Cut before the joist
Cut after the joist
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76
Multiple Choice
What is the diameter range for minibore/microbore copper pipes?
50mm and larger
28mm and larger
12, 15, 22mm
6, 8, 10mm
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78
Multiple Choice
When would use a DZR brass fittings?
For aesthetics
Cold water installation
Hot water installation
Risk of dezincification
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80
Multiple Choice
Copper bought in half hard straight lengths is:
R220
R290
R250
R230
81
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