WorksheetsMTL2 Central Heating Learner Outcome 5
Total questions: 30
Worksheet time: 15mins
What is meant by “dressing” a radiator?
Painting the radiator
Fixing it to the wall
Fitting valves, air vent and blanking plug
Filling with water
What jointing material is commonly used on radiator valve tails?
Silicone sealant
Hemp only
PTFE tape
Flux
Recommended clearance from floor to radiator bottom is:
50mm
100mm
150mm
300mm
Why must pipework be clipped correctly?
Improve heat output
Reduce corrosion
Prevent movement and noise
Improve aesthetics only
Pipework in areas subject to frost must be:
Painted
Oversized
Insulated
Left exposed
What must be considered when fixing pipework in walls?
Pipe colour
Radiator type
Expansion and accessibility
Boiler output
Why does heating pipework expand?
Increased pressure
Increase in temperature
Air in the system
Pump speed
What allows for expansion in plastic pipework?
Rigid joints
Tight clips
Expansion loops or sleeves
Larger radiators
What can happen if expansion is not allowed for?
Improved circulation
Reduced heat output
Noise and pipe damage
Lower pressure
Clip spacing should follow:
Manufacturer preference
Customer request
Industry recommendations
Pipe colour
What happens if clips are spaced too far apart?
Better expansion
Reduced cost
Sagging and noise
Higher pressure
Which factor affects clip selection?
Boiler efficiency
Pipe material and size
Radiator output
Water temperature
Which joint type uses solder to seal?
Compression
Push-fit
Capillary
Threaded
Which joint allows future disassembly?
Brazed
Soldered
Compression
Welded
What must be considered when selecting joints?
Pipe colour
Installer preference
System pressure and temperature
Radiator type
Where should automatic air vents be installed?
Lowest points
Near radiators
High points in the system
On the filling loop
Why must control components be accessible?
For aesthetics
For servicing and replacement
To improve efficiency
To reduce noise
Where is a room thermostat best positioned?
Above a radiator
Near a window
On an internal wall with good airflow
In direct sunlight
Boiler connections are usually made using:
Push-fit only
Brazed joints
Manufacturer-supplied fittings
Plastic joints only
Radiator valve tails are sealed using:
Flux
Silicone
PTFE tape or jointing compound
Adhesive
What must be checked before connecting to components?
Pipe colour
Manufacturer’s instructions
Radiator size
Water level
Boilers must always be installed according to:
Installer experience
Customer preference
Manufacturer instructions
Pipe layout
Why should components be securely fixed?
To reduce heat loss
To prevent movement and damage
To speed up filling
To reduce pressure
Filling and venting components on sealed systems are usually fitted on the:
Flow pipe
Vent pipe
Return pipe
Overflow pipe
Why can older systems be difficult to modify?
Poor insulation
Imperial pipe sizes
Low boiler output
Modern controls
Which material may require pipe threading equipment?
Copper
Plastic
Low carbon steel
Aluminium
What must be considered before connecting into an existing system?
Radiator colour
Pipe material and age
Programmer type
Water temperature
Pipework in roof spaces must be insulated to prevent:
Corrosion
Noise
Freezing
Expansion
How far should pipework be insulated from a cylinder connection?
200mm
500mm
At least 1 metre
Entire system
Feed and expansion cisterns should be insulated to:
Improve heat output
Reduce corrosion
Meet Water Supply Regulations
Improve pressure
