Evaporator Coils

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Question 1

What is the purpose of the evaporator coil in a split system air conditioner?

A	It removes heat from the system
B	It absorbs heat into the system
C	It decreases air velocity
D	It is used to help increase the relative humidity

Question 2

An indoor evaporator coil must be installed

A	At least 1” above the heat exchanger
B	At least 2” to 3” above the heat exchanger
C	At least 4” to 5” above the heat exchanger
D	At least 6” above the heat exchanger

Question 3

A direct expansion evaporator coil

A	Has the controlled medium in contact with the coil
B	Never uses a TXV type metering device
C	Has the controlled medium in contact with a fluid that is cooled by the coil
D	Always uses a TXV type metering device

Question 4

Air conditioning evaporator coils are commonly

A	Stainless steel and aluminum
B	Copper and stainless steel
C	Galvanized steel and copper
D	Copper and aluminum

Question 5

What is the purpose of a distributor?

A	It feeds refrigerant to the compressor from the evaporator coil
B	It feeds refrigerant to the evaporator coil
C	It feeds refrigerant to the condenser coil
D	It feeds refrigerant to a solenoid valve

Question 6

When an uncased evaporator coil is installed, metal plates are commonly installed around the coil. What is the purpose of these metal plates?

A	To increase the quantity of air in the system
B	To direct airflow around the coil
C	To decrease the flow of air through the coil
D	To force the air to flow through the coil

Question 7

Why is it important to ensure that the evaporator coil on a split system is installed level?

A	To allow the proper f low of liquid refrigerant in the coil
B	To help the system properly return the oil back to the compressor
C	To allow for proper drainage
D	To direct the refrigerant gas back to the compressor at the proper rate

Question 8

Split system evaporator coils are commonly installed

A	On the positive pressure side of the blower before the heat exchanger
B	On the positive pressure side of the blower after the heat exchanger
C	On the negative pressure side of the blower before the heat exchanger
D	On the negative pressure side of the blower after the heat exchanger

Question 9

What type of evaporator coil is commonly used in horizontal air handling systems?

A	A coil
B	N coil
C	H coil
D	Slant coil

Question 10

What type of evaporator coil is commonly used in residential upflow systems?

A	A coil
B	N coil
C	H coil
D	Slant coil

Question 11

What type of evaporator coil is commonly used in residential upflow systems with limited plenum space?

A	A coil
B	N coil
C	H coil
D	None of the above

Question 12

Rooftop package unit evaporator coils are commonly installed

A	On the positive pressure side of the blower before the heat exchanger
B	On the positive pressure side of the blower after the heat exchanger
C	On the negative pressure side of the blower before the heat exchanger
D	On the negative pressure side of the blower after the heat exchanger

Question 13

When is a “P” trap installed?

A	When an evaporator coil is located after a heat exchanger
B	When the evaporator is an A type coil
C	When the evaporator is an H type coil
D	When an evaporator coil is located on the negative side of the blower

Question 14

What is the purpose of a “P” trap?

A	To prevent blockage of a condensate drain
B	To prevent condensation from entering the duct system
C	To aid in cleaning a condensate drain
D	To trap debris that enters a condensate drain

Question 15

If an A coil has a ¾” drain line leaving the drain pan, according to code what would be the minimum size of the drain line?

A	. ½”
B	¾”
C	1”
D	1 ¼”

Question 16

Which of the following is the minimum required slope for a drain line?

A	1/8” per foot of horizontal run
B	¼” per foot of horizontal run
C	½” per foot of horizontal run
D	¾” per foot of horizontal run

Question 17

Cooling units larger than 6 tons must discharge to a

A	Sanitary sewer drain, storm drain, or French drain
B	Gutter, roof drain, or on the roof
C	Both A and B are correct
D	. None of the above

Question 18

Cooling units 6 tons or smaller must discharge to a

A	Sanitary sewer drain, storm drain, or French drain
B	Gutter, roof drain, or on the roof
C	Both A and B are correct
D	None of the above

Question 19

Which of the following materials must not be used as a drain pipe?

A	Galvanized steel
B	Polybutylene, ABS, and CPVC
C	Lead and aluminum pipe
D	Copper and PVC

Question 20

An auxiliary drain pan is required when cooling coils are located in areas where water damage can occur if the primary drain were to fail. What is the minimum required size of the auxiliary drain pan?

A	20” deep and not less than 4” larger than the unit on each side
B	1 ½” deep and not less than 3” larger than the unit on each side
C	1” deep and not less than 2” larger than the unit on each side
D	None of the above

Question 21

When using galvanized steel as an auxiliary drain pan, what is the minimum thickness of the steel?

A	22 gauge
B	24 gauge
C	26 gauge
D	30 gauge

Question 22

When routing the secondary drain line, which of the following is allowed by code?

A	Route the line in a conspicuous place to serve as an alarm
B	Route the line into the primary drain line
C	Both A and B are allowed by code
D	Neither A nor B are allowed by code

Question 23

Which of the following is an approved means as an alternative to the secondary drain line?

A	Use a normally open float switch located in the secondary drain pan that is in series with the contactor coil of the condensing unit
B	Use a normally closed float switch located in the secondary drain pan that is in series with the contactor coil in the condensing unit
C	Neither A nor B are an approved method
D	Both A and B are approved method

Question 24

If a secondary drain pan is not possible to install on a system located in the attic, what other means is allowed by code to prevent water damage?

A	Use a condensate pump system to remove the moisture
B	There are no other means, a drain pan must be used
C	A secondary drain line may be routed from the overflow drain to a conspicuous place
D	None of the above

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Evaporator Coils

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