Heating Circuits in Visual Studio .NET

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Heating Circuits
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The room thermostat should be located where it will be in the natural circulating path of room air True False
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The thermostat should not be exposed to heat from nearby fireplaces, radios, televisions, lamps, or rays from the sun True False
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Newer hot-air furnaces feature printed circuit contro is True False
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The heat pump is a heat multiplier True False
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The heat pump can take the heat generated by a refrigeration unit and use it to heat a room or whole house True False
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On mild temperature days, the heat pump handles all heating needs True False
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When the second-stage furnace is satisfied and the plenum temperature has cooled to below 90 degrees and 100 degrees F, the heat pump relay turns the heat pump on and controls the conditioned space until the second-stage operation is required again True False
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During the defrost cycle, the heat pump switches from heating to cooling True False
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If after a defrost cycle, the air downstream of the coil gets above 115 degree F, the closing point of the heat-pump relay, the compressor will stop until the heat exchanger has cooled down to 90 to 100 degrees as it does during normal cycling operation True False
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During the summer cooling season the heat pump works as a split system True False
The installation, maintenance, and operating efficiency of the heat-pump system are like those of all other comfort systems True False
HVAC Licensing Exam Study Guide
In the heat-pump system the air distribution system and diffuser locations are not too important True False
There are four ways to describe the heat-pump methods of transporting heat into the house True False
Newer furnaces have been designed with efficiencies of up to 97 percent True False
High efficiency furnaces achieve a high level of fuel conversion by using a unique heat-exchanger design True False
The Pulse furnace uses a spark plug for an igniter True False
The Pulse furnace uses a pilot light True False
The Pulse furnace uses PVC for connections to the outside air True False
Heating Circuits
MULTIPLE-CHOICE ANSWERS 1 2 3 4 5 6 7 8 9 B A A B D C B B A 10 11 12 13 14 15 16 17 B A A D C C C B 18 19 20 21 22 23 24 25 A A A D D A A A 26 27 28 29 30 31 32 33 E D C C A B C A 34 35 36 37 38 39 40 41 E D A B A B C B
TRUE-FALSE ANSWERS 1 2 3 4 5 6 7 8 9 T T T F T T F T T 10 11 12 13 14 15 16 17 18 T T T T F T T T T 19 20 21 22 23 24 25 26 27 T T T T T T T T T 28 29 30 31 32 33 34 35 F F T T T T F T
NOTES
14
SAFETY ON THE JOB
HVAC Licensing Study Guide
Copyright 2007 by The McGraw-Hill Companies, Inc Click here for terms of use
HVAC Licensing Exam Study Guide
This chapter includes useful safety information The facts that a HVAC mechanic must know have been gleaned from years of HVAC experience The apprentice (or even the journeyman) should find these tips useful
BASIC SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, maintenance, or use of air-conditioning and refrigeration equipment can cause explosion, fire, electrical shock, or other conditions that may cause personal injury or property damage Consult a qualified installer, a service agency, or a distributor branch for information or assistance The qualified installer or agency must use factory-authorized kits or accessories when modifying any product Refer to the individual instructions packaged with the kits or accessories when installing You will notice that most codes tell you to observe the manufacturer s instructions when installing Here are some essential guidelines: Follow all safety codes Wear safety glasses and work gloves Use quenching cloths for brazing operations Have fire extinguishers available Read the instructions thoroughly and follow all warnings or cautions attached to the unit Consult local building codes and the National Electrical Code (NEC) for special requirements
It is important to recognize safety information This is the safety-alert symbol: When you see this symbol on the unit and also in installation instructions or manuals, be alert to the potential for personal injury Understand the signal words: DANGER WARNING CAUTION NOTE
These words are used with the safety-alert symbol DANGER identifies the most serious hazards, which will result in severe personal injury or death WARNING signifies hazards that could result in personal injury or death CAUTION is used to identify unsafe practices that may result in minor personal injury or equipment and property damage NOTE is used to highlight suggestions that will result in enchanced reliability or operation When working with electricity, it is very important to make sure that you do not touch the hot wire (either black or red in a three-wire cable) and ground There is usually a bare wire (it goes to ground) and a white wire, which is neutral or also a ground If you touch the white or the bare wire and either the black or red wire, you will be shocked with 120 volts in most instances If you make contact with the black and red wires, you will probably receive a shock with 240 volts pushing enough current through your body to cause your heart to start fibrillating or stop Take adequate precautions when working around 120 or 240 volts Sometimes the circuits you will be working with will be powered with 240 volts You must be aware of
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