Answer the following questions and give examples.

Date: 2015-10-07; view: 652.

Correct the following statements if necessary.

Complete the following sentences according to the text.

COMPREHENSION CHECK

1) An average, ordinary modern domestic heating system has …

2) A programmer contains …

3) A "diverter valve" is …

4) The water in the boiler is separate from …

5) The cylinder will never reach the selected temperature and the cylinder thermostat will never shut the boiler down if …

6) A "pump over-run" facility removes …

1) The boiler is turned on or off by the programmer.

2) A 'divert valve' always shares the flow between cylinder and radiators.

3) Heating system water is drained out by a heating engineer every year.

4) The hot water cylinder has a long coil of pipe outside, through which the boiler water flows.

5) The temperature of the water set by the control knob on the front of the boiler is the same as the temperature of the radiators.

6) The pump shortens heat exchanger life.

1) What functions has a boiler?

2) What is the function of a clock and two time switches?

3) What is the function of a "room thermostat" and a "hot water cylinder thermostat"?

4) What is the function of a “divert valve”?

5) Why is the divert valve called a 'mid-position valve'?

6) What slows down internal corrosion?

7) How is the boiler water kept separate from the domestic water?

8) Why can a "pump over-run" facility be puzzling to users?