GMJ 6035 central heating 1

What is Delta T

• Weight of the cistern

• The pump speed

• Room temperature divided by boiler temperature

• The difference between the temperature of the radiator and the room

Which radiator is a double panel double convector

• 
• 
• 
• 

Where is the neutral point

• At the edge of the Klingon empire

• Where the open vent connects to the circuit

• Where the primary flow becomes the return

• Where the cold feed connects to the circuit

The main problem with the one pipe system is that

• They are prone to blockages

• They can't be used in a bungalow

• They are expensive to run

• The earlier radiators pass cooler water back into the circuit

The cold water supply to a fully pumped open vented central heating system should be

isolated at the

• stop valve to the incoming cold water supply pipework

• Gate valve on the cold feed pipework from the F & E cistern

• service valve to the float operated valve to the CWS cistern

• service valve to the float operated valve to the F & E cistern.

The cold water supply to a fully pumped open vented central heating system should be

isolated at the

• stop valve to the incoming cold water supply pipework

• Gate valve on the cold feed pipework from the F & E cistern

• service valve to the float operated valve to the CWS cistern

• service valve to the float operated valve to the F & E cistern.

When setting the water level in a feed and expansion cistern, the allowance that should be

made for the expansion of water in the heating system is

• 4 %

• 6 %

• 10 %

• 1600 times its volume

If TRVs or zone valves on a system close, the purpose of the automatic by-pass valve is to

make sure that

• water can flow through the cylinder

• air cannot enter the heating system

• water cannot pump over the vent

• water can flow through the boiler

The recommended test pressure for a hydraulic test on a central heating system is

• normal working pressure

• 1.5 times normal working pressure

• twice the normal working pressure

• 3 bar pressure

Before isolating a heating system for the day, in cold weather, in a flat owned by an elderly

person, a plumber should

• get on with the work as fast as possible

• ensure that an alternative means of heating is available

• only carry out the work if two plumbers are available

• refuse to carry out the job at all costs.