Plumbing level 2 - PP4 - Central Heating

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