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WorksheetsDomestic Hot Water 6035-02 | Part 1
Total questions: 36
Worksheet time: 18mins
The difference between 'direct' and 'indirect' hot water systems is:
Direct system comes straight from the CWSC
Indirect systems only feeds the kitchen sink
Direct system does not have a heat exchanger coil within the cylinder
Indirect systems have no need for an F&E cistern
Define 'back siphonage'.
When the pressure at the supply end of the water main drops suddenly causing a vacuum
When the mains water is shut off due to repairs causing a backwards flow
When the pressure drops within the cylinder causing a circulation within one pipe
When the pressure is higher from the cold supply than the hot supply
What does WRAS stand for?
Water Regulations Application Service
Water Regulations Advisory Scheme
Water Regulations Arbitration Site
Water Regulations Advisory Service
What supplies the primary circuit with water?
Feed & Expansion cistern
Mains water
Cold water storage cistern
None of the above
If the coil in the cylinder fails, what course of action should be taken?
Replace the coil
Replace the boiler
Replace the cylinder
Replace the F&E cistern
What is another term for "one-pipe circulation"?
Parasitic circulation
Anti-circulation
Backwards circulation
Primatic circulation
If the pipework sizing is too small it will?
Effect pressure
Effect flow rates
Improve flow rates
None of the above
What is the purpose of this proprietary fitting?
To allow the connection between copper pipe and lead pipe
To allows the connection between LCS pipe and copper pipe
To allows the connection between lead pipe and lead pipe
To allow the connection between waste pipe and lead pipe
Which of the following could be installed to prevent water hammer?
Double check valve
Lever arm service valve
Equilibrium valve
Portsmouth valve
What is the component shown?
Twin impellor pump
Base heat exchanger
Negative head pump
Thermostatic pump valve
Before a soundness test can begin, what should be visually checked?
Soldered joints made
Clips are in place
Compression joints tightened
All of the above
What must all immersion heaters installed today include? (select 2)
Cut-off device
Reset button
Temperature reader
A pump
What is the need of a primary flow and return on an indirect system?
To circulate unused hot water to the outlets
To supply water from the CWSC to the cylinder and back again
To help water flow with the force of gravity
To supple a source of heat to the hot water cylinder
STATEMENT: According to BS6700, the capacity of the CWSC should be at least the same capacity of the hot water cylinder it is feeding.
True
False
What is known as 'negative head'?
Operates under natural flow of water
Operates under a charge
What would happen if debris was to build-up within a valve?
Pass water when closed
Break up limescale
Easier to tighten/loosen
None of the above
What would the height of the open vent over the CWSC be if the systems height is 7m? (150mm + 40mm per metre of system height)
390mm
190mm
430mm
280mm
What air gap is used on a kitchen sink to separate the spill over level of the appliance and the outlet point of the tap?
AUK3
AUK2
AUK1
AG
Which of the following is NOT an indication of a cylinder stat failure?
Steam in loft area
Frozen pipework
Open vent discharging
Dangerously hot water temperatures
What is the allowance for 'pressure drop' during a rigid pipe 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
A system only has one CWSC in the loft area and fills both the primary and secondary waters through the same pipe is known as?
Single feed system
Double feed system
Primary fed system
F&E feed system
What temperature does the boiler heat the primary water to?
55°C
65°C
75°C
85°C
What valve should be installed on the cold feed pipe?
Service valve
Fullway gate valve
Stop valve
Low pressure stop valve
What is the total time of test for plastic pipework test A?
45 minutes
60 minutes/1 hour
105 minutes/1 hour 45 minutes
120 minutes/2 hours
What would happen if the cylinder stat was to fail to close?
Temperature of water continues to increase
Back-up cylinder stat would close
The system would be without hot water
Loss in pressure
What type of isolation does an instantaneous electric shower have?
Double capacitor rod
Single pole switch
Optocoupler
Double pole switch
What building regulation covers hot water?
Part B
Part h
Part V
Part G
What does F&E stands for?
Flow & evaporation
Force & elevation
Feed & expansion
Front & exit
Which of the following is NOT a type of hot water cylinder?
Coiled
Non-coiled
Chambered
Half-coiled
What wattage is an immersion heater rated at?
2kW
2.2kW
2.8kW
3kW
Building regulations Part L require water to take no longer than how long to heat up?
10 minutes
18 minutes
25 minutes
30 minutes
Which of the following is NOT considered a disadvantage of having a direct system?
Risk of rusty water
Risk of scale build-up
Lack of temperature control
Rapid heat-up time
What is the purpose of having a open vent on the system?
Allow air in and out of the system
Allow the plumber to see the water levels
Prevents expansion and contraction
Prevents the system overheating
Which cylinder has no heat exchanger (coil) inside it?
Direct
Indirect
Multi-coiled
Single coiled
After a new system or section of pipework is installed, what needs to be removed from the pipes?
Chlorine
Debris
Limescale
Lead
What is this valve?
Blending valve
3-port zone valve
Motorised gate valve
Adjustable chrome tee
