WorksheetsMTL2 Central Heating Learner Outcome 11
Total questions: 12
Worksheet time: 6mins
What must be checked before filling a heating system?
Radiator outputs
Thermostat settings
That all open ends are capped or valves closed
Pump speed
Why must excess flux be removed from joints?
For appearance
To prevent corrosion
To improve heat transfer
To reduce noise
Why are motorised valves manually opened before filling?
To reduce pressure
To speed filling
To allow water to reach all parts of the system
To protect the pump
What is the normal cold fill pressure for a sealed system?
0.5 bar
1 bar
2 bar
3 bar
Why is filling carried out in stages on sealed systems?
To save water
To improve efficiency
To allow air to be released safely
To prevent corrosion
What should be done immediately after filling?
Increase boiler temperature
Set programmer
Visually inspect for leaks
Add glycol
Heating systems should be pressure tested to:
Working pressure only
Twice working pressure
At least 30% above working pressure
10 bar
Minimum test duration should be:
30 minutes
1 hour
2 hours
24 hours
What must be removed before pressure testing?
Radiators
Valves
Circulating pump
Expansion vessel
What should be done if leaks are found during testing?
Ignore and continue
Increase pressure
Rectify defects before proceeding
Add inhibitor
Poor pipe clipping may cause:
Increased efficiency
Noise and movement
Better expansion
Reduced corrosion
What should be done if a control valve is faulty?
Modify it
Bypass it
Replace it following manufacturer guidance
Ignore it
