Using the information from the text, write a short summary.
Text 6
Central heating systems
Central heating systems generate heat for an entire building at one central place. The heat is then delivered where it is needed. Most systems serve only one building. But some heat a group of buildings, such as those at a college, a military base, or an apartment complex.
Central heating systems have automatic controls, with a thermostat to regulate the temperature of the rooms heated by the system. The thermostat turns on the system when the temperature drops below the setting of the thermostat. Most thermostats include a device called an anticipator to help the thermostat keep the room at an even temperature.
Another automatic control turns off the central heating system if any part of it becomes dangerously overheated. Still another control prevents the system from starting unless it can start safely.
There are two main kinds of central heating systems: (1) direct and (2) indirect. They differ in the way they distribute heat. A direct system circulates the warm air throughout the area being heated. An indirect system circulates steam or hot water through pipes to convectors or radiators, which give off heat. Both direct and indirect heating systems use electricity or some kind of fuel, such as gas or oil, as their source of heat.
Warm-air heating. A warm-air heating system warms the air in a furnace and then forces it through a system of ducts(pipes) to each room. Another system of ducts carries cool air from the rooms back to the furnace. An electrically driven blower in the furnace moves the air through the ducts, and filters remove dust particles from the air.
Many private homes have warm-air systems. These systems can do more than just heat the air. With a humidifier, for example, a forced warm-air system adds moisture to the air and increases the humidity throughout the home. The ducts and blower can be used as part of a central air-conditioning unit.
1. Study the following words:
overheated, setting, give off, ducts, humidity, moisture, prevent
2. Read and translate the sentences:
a) A warm-air heating system warms the air in a furnace and then forces it through a system of ducts(pipes) to each room.
b) An electrically driven blower in the furnace moves the air through the ducts, and filters remove dust particles from the air.
c) There are two main kinds of central heating systems: (1) direct and (2) indirect.
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d) With a humidifier, for example, a forced warm-air system adds moisture to the air and increases the humidity throughout the home.
e) Most thermostats include a device called an anticipator to help the thermostat keep the room at an even temperature.
3. Give the three forms of these verbs and translate them:
Differ, remove, carry, take, raise, deliver,
4. Fill in prepositions and adverbs:
a) Another automatic control turns … the central heating system if any part of it becomes dangerously overheated.
b) …a humidifier, for example, a forced warm-air system adds moisture to the air and increases the humidity throughout the home.
c) Central heating systems have automatic controls, with a thermostat to regulate the temperature …the rooms heated by the system.
d) The thermostat turns … the system when the temperature drops below the setting of the thermostat.
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