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Question 1

What is the advantage of a sealed system.

Answer 1

Clean and pump can go anywhere

Question 2

What information is needed to size an expansion vessel?

Answer 2

The volume of water and the temperature rise.

Question 3

What is the main difference in the operation between a conventional and a condensing boilier.

Answer 3

In a condensing boiler the flue temperature must be above the dew point temperature of the products of combustion.

Question 4

Why should radiators and convectors not be on the same control circuit?

Answer 4

Because the respond differently to a change in temperature. Radiators respond with an exponent of 1.3. Convectors with an exponent of 1.5.

Question 5

Explain the principle of compensated temperature control.

Answer 5

If the heat losses are below full load then they can be met with a below design flow rate into the emitters. The flow temperature can be reduced as a function of the external temperature.