52. Complete the following sentences according to the text.

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 …

53. Correct the following statements if necessary.

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.

54. Answer the following questions and give examples.

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?

55. Fill in the table using the information from Text 6.

Components of Heating System	Functions of Components
…	…

56. Write a summary of Text 5.

LANGUAGE FOCUS

57. Unjumble the words.

Model: yesmst → system

1) falteel →…	4) sotoiinp →…	7) apt →…
2) nreylcid →…	5) matrtehtos →…	8) dairtroa →…
3) ebirlo →…	6) epraseta →…	9) bonk →…

58. Give the definitions of the following terms.

1) thermostat;	4) static water;
2) pump;	5) inhibitor;
3) valve;	6) coil of pipe.

59. Choose the contextual meanings of the words written in bold in Text 5.

1) separate

a) отдельный	c) специальный
b) отделять	d) автономный

2) switches

a) выключатели	c) переключать
b) переключение	d) изменять

3) reason

a) убеждать	c) основание
b) обосновывать	d) мотив

4) indefinitely

a) неопределенно	c) бессрочно
b) бесконечно	d) безгранично

5) knob

a) выдаваться	c) ручка управления
b) выступать	d) кнопка

6) run

a) столкнуться	c) работать
b) бежать	d) управлять

60. Find in the text the opposites of the following words.

1) to facilitate - …	4) to open - …	7) to cool - …
2) external - …	5) to turn on - …	8) to light - …
3) to delay - …	6) to retain - …	9) to terminate - …

61. Fill in the correct prepositions, translate the phrases, then choose any five items and make up the sentences of your own.

1) to be due ___ smth.; 2) to work together ___ a whole system; 3) to turn on and off ___ pre-selected times; 4) to depend ___ smth.; 5) to be calling ___ heat; 6) to share the flow ___ cylinder and radiators; 7) ___ this reason; 8) to be separate ___ the water; 9) to go ___ the boiler; 10) to be drained ___ by a heating engineer; 11) to be dosed ___ inhibitor; 12) to transfer ___ the wall of the pipe ___ the water ___ the cylinder; 13) the knob ___ the front ___ the boiler; 14) to run ___ a few minutes.

ACTIVE VOCABULARY