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[Show more]A good evacuation of a refrigerant circuit to remove non-condensables will help insure: 
A.) higher condensing temperatures 
B.) higher suction pressures 
C.) low suction line pressure drop 
D.) higher efficiency and capacity D.) higher efficiency and capacity 
 
A condensing unit should be mounted ...
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Add to cartA good evacuation of a refrigerant circuit to remove non-condensables will help insure: 
A.) higher condensing temperatures 
B.) higher suction pressures 
C.) low suction line pressure drop 
D.) higher efficiency and capacity D.) higher efficiency and capacity 
 
A condensing unit should be mounted ...
Calculate the air volume based upon these conditions: 
 
90,000 BTUH output 
Return air temperature: 70F 
Supply air temperature: 110F 
 
a. 1,158 CFM 
b. 1,500 CFM 
c. 1,800 CFM 
d. 2,083 CFM d (2,083 CFM) 
 
When measuring CFM using temperature rise method, the furnace blower motor speed should be...
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Add to cartCalculate the air volume based upon these conditions: 
 
90,000 BTUH output 
Return air temperature: 70F 
Supply air temperature: 110F 
 
a. 1,158 CFM 
b. 1,500 CFM 
c. 1,800 CFM 
d. 2,083 CFM d (2,083 CFM) 
 
When measuring CFM using temperature rise method, the furnace blower motor speed should be...
Refrigerant vapors in high concentrations should not be inhaled since they May cause heart irregularites or unconsciousness 
 
What diagrams would you use to find the physical location of the low voltage connection terminals in the unit? Pictorial diagram 
 
The input side of a step down transformer...
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Add to cartRefrigerant vapors in high concentrations should not be inhaled since they May cause heart irregularites or unconsciousness 
 
What diagrams would you use to find the physical location of the low voltage connection terminals in the unit? Pictorial diagram 
 
The input side of a step down transformer...
Heat Anticipators Are wired in series 
 
Cooling anticipators Are wired parallel 
 
Low pressure switches detects a loss of refrigerant 
 
Low pressure switches de energizes the compressor 
 
Electronic air cleaners do not remove odors 
 
Electronic air cleaners normally are 4000 to 8000 dc volts 
 ...
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Add to cartHeat Anticipators Are wired in series 
 
Cooling anticipators Are wired parallel 
 
Low pressure switches detects a loss of refrigerant 
 
Low pressure switches de energizes the compressor 
 
Electronic air cleaners do not remove odors 
 
Electronic air cleaners normally are 4000 to 8000 dc volts 
 ...
What method of heat transfer does not require fluids or solids ? Radiation - movement of heat through heat waves 
 
Capillary tubing should only be cut to length using a : A triangular or knife-edge file 
 
Before beginning any electrical checkout procedure, what steps must be taken after the equipm...
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Add to cartWhat method of heat transfer does not require fluids or solids ? Radiation - movement of heat through heat waves 
 
Capillary tubing should only be cut to length using a : A triangular or knife-edge file 
 
Before beginning any electrical checkout procedure, what steps must be taken after the equipm...
<question: The density of air is 
 
 A: How much air weighs per cubic foot 
 
 B: How much volume one pound of air occupies 
 
 C: The ratio of the weight of water to that of the same volume of water 
 
 D: The ratio of the amount of water vapor contained in a cu. ft. of air to the amount of m...
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Add to cart<question: The density of air is 
 
 A: How much air weighs per cubic foot 
 
 B: How much volume one pound of air occupies 
 
 C: The ratio of the weight of water to that of the same volume of water 
 
 D: The ratio of the amount of water vapor contained in a cu. ft. of air to the amount of m...
Class A Ordinary Extinguisher 
 
Class B Liquid Extinguisher 
 
Class C Electrical Extinguisher 
 
Asphyxiation causes what? Nausea, Dizziness, Heart Irregularities, and Unconciousness 
 
Ladder must be at what dimensions in relation to a house? 4 ft for every 1 ft, 3 ft above the top of the roof. 
...
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Add to cartClass A Ordinary Extinguisher 
 
Class B Liquid Extinguisher 
 
Class C Electrical Extinguisher 
 
Asphyxiation causes what? Nausea, Dizziness, Heart Irregularities, and Unconciousness 
 
Ladder must be at what dimensions in relation to a house? 4 ft for every 1 ft, 3 ft above the top of the roof. 
...
What electro-mechanical control would you use on a cap tube or automatic expansion valve system to maintain the space temperature? 
 
 A: A dual pressure control 
 
 B: A low pressure control 
 
 C: A thermostatic control 
 
 D: A high pressure control C: A thermostatic control 
 
Open motors are de...
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Add to cartWhat electro-mechanical control would you use on a cap tube or automatic expansion valve system to maintain the space temperature? 
 
 A: A dual pressure control 
 
 B: A low pressure control 
 
 C: A thermostatic control 
 
 D: A high pressure control C: A thermostatic control 
 
Open motors are de...
What precautions are required when mounting any gas furnace on a wood platform in an attic? None 
 
The gas control valve may be damaged if exposed to an inlet pressure above what? 14 inch W.C. 
 
How many elbows and joints should a vent connector have? As few as possible to reduce resistance of flu...
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Add to cartWhat precautions are required when mounting any gas furnace on a wood platform in an attic? None 
 
The gas control valve may be damaged if exposed to an inlet pressure above what? 14 inch W.C. 
 
How many elbows and joints should a vent connector have? As few as possible to reduce resistance of flu...
What type of temperature is often used by customers when discussing human comfort Dry buld 
 
A particular right triangle has two equal sides. This is a _______ degree triangle 45 
 
T or F? The following is proper for the care of hand tools: clean and wipe them regularly. True 
 
What is a method o...
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Add to cartWhat type of temperature is often used by customers when discussing human comfort Dry buld 
 
A particular right triangle has two equal sides. This is a _______ degree triangle 45 
 
T or F? The following is proper for the care of hand tools: clean and wipe them regularly. True 
 
What is a method o...
A fuse is used in an electrical circuit to Protect the circuit wires from an overcurrent condition 
 
How are fuses rated In amps with a maximum voltage rating 
 
What will an ohmmeter measure when testing an open fuse Infinite resistance 
 
What type of sensing element is commonly found in fan and ...
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Add to cartA fuse is used in an electrical circuit to Protect the circuit wires from an overcurrent condition 
 
How are fuses rated In amps with a maximum voltage rating 
 
What will an ohmmeter measure when testing an open fuse Infinite resistance 
 
What type of sensing element is commonly found in fan and ...
In HVACR terms, what is a feature? A special characteristic of a product. 
 
In HVACR terms, what is a benefit? The value the customer receives from using the feature 
 
What type of temperature is often used by customers when discussing human comfort? Dry bulb 
 
What is an honest person? A person ...
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Add to cartIn HVACR terms, what is a feature? A special characteristic of a product. 
 
In HVACR terms, what is a benefit? The value the customer receives from using the feature 
 
What type of temperature is often used by customers when discussing human comfort? Dry bulb 
 
What is an honest person? A person ...
What makes a contract legal? Any verbal or written agreement. 
 
Why should hacksaws and power saws not be used when cutting tubing or refrigerant lines? The small shavings created by the teeth of the saw can enter the tubing and do damage to the components of the system. 
 
Why should tube cutters ...
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Add to cartWhat makes a contract legal? Any verbal or written agreement. 
 
Why should hacksaws and power saws not be used when cutting tubing or refrigerant lines? The small shavings created by the teeth of the saw can enter the tubing and do damage to the components of the system. 
 
Why should tube cutters ...
Low airflow over a residential split system air conditioning evaporator can cause 
 
 A: Liquid flood-back to the compressor 
 
 B: A decrease in compression ratio 
 
 C: An increase in suction line superheat 
 
 D: Oil logging in the evaporator A: Liquid flood-back to the compressor 
 
Which of ...
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Add to cartLow airflow over a residential split system air conditioning evaporator can cause 
 
 A: Liquid flood-back to the compressor 
 
 B: A decrease in compression ratio 
 
 C: An increase in suction line superheat 
 
 D: Oil logging in the evaporator A: Liquid flood-back to the compressor 
 
Which of ...
Ch. 1-1 The ability to utilize all types of communication skills is ________ to the HVACR technician. 
a) not as important as "hands-on" technical skills 
b) somewhat important 
c) unimportant 
d) very important d) very important 
 
Ch. 1-2 It is important to be _______ in filling out service ord...
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Add to cartCh. 1-1 The ability to utilize all types of communication skills is ________ to the HVACR technician. 
a) not as important as "hands-on" technical skills 
b) somewhat important 
c) unimportant 
d) very important d) very important 
 
Ch. 1-2 It is important to be _______ in filling out service ord...
An air conditioning technician is working in the basement of a large B37public building. The technician notices several unsafe and dangerous conditions. Of the following conditions that are noticed, which is the most dangerous and should be reported immediately? 
 
 A: Gas leaking from a cracked pi...
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Add to cartAn air conditioning technician is working in the basement of a large B37public building. The technician notices several unsafe and dangerous conditions. Of the following conditions that are noticed, which is the most dangerous and should be reported immediately? 
 
 A: Gas leaking from a cracked pi...
What are the five basic components to any schematic? 1. A power supply 
2. A path for the power 
3. A load or component that operates from the power. 
4. A switch or component that interrupts the power to the load. 
5. A legend or key that explains what the various symbols and abbreviations used in ...
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Add to cartWhat are the five basic components to any schematic? 1. A power supply 
2. A path for the power 
3. A load or component that operates from the power. 
4. A switch or component that interrupts the power to the load. 
5. A legend or key that explains what the various symbols and abbreviations used in ...
d (very important) The ability to utilize all types of communication skills is ____ to the HVACR technician. 
 
a. not as important as "hands-on" technical skills 
b. somewhat important 
c. unimportant 
d. very important 
 
d (all of the above: clear, complete, concise) It is important to be ____ ...
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Add to cartd (very important) The ability to utilize all types of communication skills is ____ to the HVACR technician. 
 
a. not as important as "hands-on" technical skills 
b. somewhat important 
c. unimportant 
d. very important 
 
d (all of the above: clear, complete, concise) It is important to be ____ ...
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