What is the advantage of a C plan two-pipe semi-gravity central heating system?

• Not compliant with Building Regulations L1b

• Limited control on heating and hot water

• Lower efficiency

• Quicker heat-up time and compliant to building regulations L1B

What is the purpose of a heat sink in a two-pipe semi-gravity central heating system?

• To increase the efficiency of the boiler

• To regulate the air pressure in the system

• To control the flow and return temperature

• To dissipate heat without overheating the boiler

What type of system uses a pump to circulate heated water around the hot water and heating circuits?

• C plan two-pipe semi-gravity

• Two-pipe semi-gravity with heat sink

• Pumped central heating only

• Fully pumped systems

What is the purpose of an automatic bypass valve in a fully pumped mid-position valve system?

• To prevent lock out and prolong circulator life

• To control the flow of water to the hot water cylinder

• To increase the system pressure when circuits close down

• To isolate the flow of water

Which type of system uses one zone valve to control the hot water and a second zone valve to control the heating circuit?

• Fully pumped two two-port valves – S plan system

• Fully pumped mid-position valve – Y plan system

• Pumped central heating only

• Two-pipe semi-gravity with heat sink

What is the purpose of locking out in a boiler?

• To increase the efficiency of the boiler

• To regulate the air pressure in the system

• To protect the boiler from overheating

• To control the flow and return temperature

What is the cause of corrosion within a central heating system?

• Aeration

• Overheating

• Low system pressure

• Excessive water flow

What is the purpose of a sealed expansion vessel in a sealed heating system?

• To isolate the flow of water

• To prevent lock out and prolong circulator life

• To control the flow of water to the hot water cylinder

• To accommodate the increase in volume as the water heats up

What is the purpose of a pressure relief valve in a sealed heating system?

• To discharge pressure to a safe location if required

• To isolate the flow of water

• To prevent lock out and prolong circulator life

• To control the flow of water to the hot water cylinder

What is the purpose of a Schrader-type pressure valve in a sealed heating system?

• For checking and topping up the air charge in the expansion vessel

• To control the flow of water to the hot water cylinder

• To prevent lock out and prolong circulator life

• To isolate the flow of water