Central Heating

Question 1

Advantages of a one pipe gravity system

Answer 1

Cheap

Question 2

Disadvantages of a one pipe system

Answer 2

Takes longer to heat up

Each radiator needs to be balanced

Uncontrolled room temperature

Question 3

Advantages of a 2 pipe gravity system

Answer 3

Quicker to heat up

Each radiator will have a TRV

Cheaper to run

Question 4

Disadvantages of a 2 pipe gravity system

Answer 4

Costs a little bit more

Question 5

Advantages of a C plan plus system

Answer 5

All heat emitters run at same temperature

Question 6

Disadvantages of a C plan plus system

Answer 6

Not fully pumped

Question 7

Advantages of an A plan fully pumped system

Answer 7

Full control of heating and hot water

Quicker to heat up

Usually fitted with a condenser boiler

Question 8

Disadvantages of an A plan fully pumped system

Answer 8

Expensive to install

Question 9

Describe the term boiler ‘lock out’

Answer 9

Boiler shuts out if temperature goes to 85°C or above

Question 10

What are some of the consequences of ‘aeration’ in a central heating system

Answer 10

Corrosion

Question 11

What’s a sealed system and how is it protected

Answer 11

No open vent - expansion vessel and pressure releasing valve

Question 12

Which governing body covers gas

Answer 12

SAFE

Question 13

Which governing body covers electricity

Answer 13

NICEIC

Question 14

Which governing body covers oil

Answer 14

OFTEC

Question 15

Which governing body covers solid fuel

Answer 15

HETAS

Question 16

What’s the difference between a traditional non condensing boiler and a condensing boiler

Answer 16

Condensing boiler has two heat exchangers and a traditional one only has one

Question 17

What does SEDBUK stand for

Answer 17

Seasons Efficiency of Domestic Boilers in the UK

Question 18

How efficient is a SEDBUK rated A boiler

Answer 18

90%

Question 19

How efficient is a SEDBUK rated B boiler

Answer 19

86-90%

Question 20

3 major advantages of a condensing boiler

Answer 20

Efficient
Good flow rate
Quiet in operation

Question 21

List the full commissioning procedure

Answer 21

Soundness test
Cold flush 
Cleanse system 
Hot flush
Full system (including inhibitor)
System check