WorksheetsPlumbing level 2 - PP4 - Central Heating
Total questions: 10
Worksheet time: 5mins
What is the purpose of the full bore valves on either side of the pump flanges?
To maintain the watertight seal
To allow the pump to be removed without draining the system
To add inhibitor to the system water
To test the level of inhibitor in the system
What happens if air is drawn into the system water?
Corrosion will take place
The pump will switch off
The boiler will cycle
The system will operate under positive pressure
What is added to the system water to reduce corrosion and the build-up of scale?
Magnetite
Inhibitor
Iron
Oxygen
Where is the neutral point of the system located?
At the base of the cold feed
At the top of the vent pipe
Next to the pump
In the boiler
What is the result of magnetite in the system?
It will increase the flow
It will reduce the need for inhibitor
It will block components and cause cool/cold areas on radiators
It will prevent corrosion
What is the function of a two port motorised valve?
To add inhibitor to the system water
To allow water from the boiler to circulate around the pipework
To test the level of inhibitor in the system
To control the flow of water to both heating and hot water circuits
What happens when both the room thermostat and the cylinder thermostat are satisfied?
The zone valves will open
The boiler will switch on
The circulator will switch on
The zone valves will close
What powers the paddle in the zone valve?
A hydraulic pump
A synchronmotor
An electric coil
A manual lever
What is the function of a three port mid-position valve?
To add inhibitor to the system water
To control the flow of water to both heating and hot water circuits
To completely stop the flow of water
To test the level of inhibitor in the system
What is the function of a three port diverter valve?
To allow water to flow to both circuits simultaneously
To divert the water flow to one or the other circuits
To test the level of inhibitor in the system
To add inhibitor to the system water
