Central heating trail 5

Why is it important to remove the circulator when cold flushing a system?

• To prevent damage to the circulator

• To increase the water pressure in the system

• To add more inhibitor to the system

• To check the temperature of the system

What should be placed between the pump flanges when the circulator is removed?

• A short section of LCS pipe

• A new circulator

• A temperature gauge

• An inhibitor

What is the purpose of bleeding a radiator?

• To release trapped air or hydrogen from the top of a radiator

• To clean the radiator with a special solution

• To check the flow of water through the radiator

• To add more coolant to the radiator

Where does a cool/cold area form in a radiator if trapped air creates it?

• At the bottom of the radiator

• In the middle of the radiator

• At the top of the radiator

• Outside the radiator

Where does a cool/cold area form in a radiator if magnetite is formed in the system?

• At the top of the radiator

• In the middle of the radiator

• At the bottom of the radiator

• Outside the radiator

What is the first step in bleeding a radiator?

• Locate the bleed valve on the radiator.

• Turn off the central heating system.

• Protect the area with a dust sheet.

• Listen for air being released.

What should you do after locating the bleed valve on the radiator when bleeding it?

• Turn off the central heating system.

• Tighten the bleed valve.

• Protect the area with a dust sheet.

• Turn bleed valve so the opening is visible.

What might be required if a radiator attached to a sealed system needs bleeding?

• The system may need to be turned off.

• The bleed valve may need to be replaced.

• The boiler may need re-pressurising.

• A new radiator may need to be installed.

What type of heating system is described in the scenario as the present system in the customer's two bedroom bungalow?

• A sealed system with electric heating.

• An open vented system with pumped central heating and gravity hot water.

• A combi boiler system with direct hot water.

• A solar heating system with backup immersion heater.

What are the radiators serving the one pipe system described as in the scenario?

• Convector radiators.

• Designer radiators.

• Plain panel radiators.

• Cast iron radiators.