G2 GAS TECHNICIAN MODULE 19 REVISED
If the venting on a high efficiency furnace runs through unheated spaces, what must be
done? - Answers- Insulate piping to prevent Condensation and freezing
What is condensate drain piping used for? - Answers- Dispose Liquid waste
Once the furnace is installed, what are the gas technician's responsibilities to the user?
- Answers- To instruct the the user in the safe and correct operation of all appliances
and equipment - clause 4.3.2
Which furnace type is the most popular? - Answers- High boy Up Flow
What type of furnace is used in areas of limited head room? - Answers- Horizontal
Forced Air
Must all defective heat exchangers be replaced immediately? - Answers- Yes
A high efficiency furnace incorporates how many heat exchangers? - Answers- Two
On a furnace with no filter rack, what should be done? - Answers- Rack should be built
on return duct connection
What is a plenum? - Answers- Duct work system connected directly to the furnace
What should be done if a customer shows signs of Co poisoning? - Answers- Evacuate,
Shut off appliance, Call TSSA
Once a fan motor has been cleaned what are the next two steps? - Answers- Check
electrical wire for tighteness and clean the blower components
How is temperature rise determined? - Answers- Placing thermometer in the return and
supply plenums while the furnace is running
What tool should be used to clean the outside of the heat exchanger? - Answers- Soft
Brush
How many heat exchangers do Natural Draft Furnace have? - Answers- One
How is Delta Temperature measured? and what should it match? - Answers- Supply Air
minus Return Air, It must not be less or more than Manufacturers Rating Plate
In a high efficiency furnace, which heat exchanger does the Supply air pass through
first? - Answers- The Secondary
What proves that your Induce blower is functional? - Answers- The pressure switch
, How is Hot Surface Igniter diagnosed? - Answers- Connect leads to both wires, check
for voltage and Resistance
How is a belt motor in a furnace maintained? - Answers- Must be Oiled and Alignment
Where is the Automatic Damper located? - Answers- Down stream of the draft hood
What purpose does a Automatic damper serve? How does it work? - Answers- Reduce
heat loss up the chimney and it opens when burners fire and closes during the off cycle
What is Static Pressure in a furnace?, how is it measured?, and what standard must it
meet? - Answers- The pressure in the furnace at 90 degrees. It's measured with a
manometer It must meet Manufacturers Rating plate standard
What are the possible causes of abnormal Static Pressure results? - Answers- Dirty Air
Filters andBlocked AC Evaporator Coil
A Tee is required to be installed off the PVC 636 pipe, what is the component that
should be attached? - Answers- A Neutralizer with a hose leading to the drain trap
In the event no sewer drain is present how is condensation water mitigated? - Answers-
A Condensation Pump
What is the AFUE rating of a typical medium efficiency furnace? - Answers- 78% - 82%
Which category of furnace is standard atmospheric appliance? - Answers- Category 1
Is a fan necessary to move the flue gases through a gravity vent? Why? - Answers- No,
hot air rises.
Are high-efficiency furnaces power vented? - Answers- Yes
Which Vent is the most heat resistant? - Answers- Type A
On a forced draft burner, where is the fan located? - Answers- Upstream from the
combustion chamber.
What is the disadvantage of oversizing a furnace? - Answers- Inefficiency
How is the delivered air volume adjusted if a belt-drive fan motor is being used? -
Answers- Adjusting the pulleys of the motor
Where must a furnace air filter be located and which direction? - Answers- Arrow must
face the negative pressure side of the Fan
If the venting on a high efficiency furnace runs through unheated spaces, what must be
done? - Answers- Insulate piping to prevent Condensation and freezing
What is condensate drain piping used for? - Answers- Dispose Liquid waste
Once the furnace is installed, what are the gas technician's responsibilities to the user?
- Answers- To instruct the the user in the safe and correct operation of all appliances
and equipment - clause 4.3.2
Which furnace type is the most popular? - Answers- High boy Up Flow
What type of furnace is used in areas of limited head room? - Answers- Horizontal
Forced Air
Must all defective heat exchangers be replaced immediately? - Answers- Yes
A high efficiency furnace incorporates how many heat exchangers? - Answers- Two
On a furnace with no filter rack, what should be done? - Answers- Rack should be built
on return duct connection
What is a plenum? - Answers- Duct work system connected directly to the furnace
What should be done if a customer shows signs of Co poisoning? - Answers- Evacuate,
Shut off appliance, Call TSSA
Once a fan motor has been cleaned what are the next two steps? - Answers- Check
electrical wire for tighteness and clean the blower components
How is temperature rise determined? - Answers- Placing thermometer in the return and
supply plenums while the furnace is running
What tool should be used to clean the outside of the heat exchanger? - Answers- Soft
Brush
How many heat exchangers do Natural Draft Furnace have? - Answers- One
How is Delta Temperature measured? and what should it match? - Answers- Supply Air
minus Return Air, It must not be less or more than Manufacturers Rating Plate
In a high efficiency furnace, which heat exchanger does the Supply air pass through
first? - Answers- The Secondary
What proves that your Induce blower is functional? - Answers- The pressure switch
, How is Hot Surface Igniter diagnosed? - Answers- Connect leads to both wires, check
for voltage and Resistance
How is a belt motor in a furnace maintained? - Answers- Must be Oiled and Alignment
Where is the Automatic Damper located? - Answers- Down stream of the draft hood
What purpose does a Automatic damper serve? How does it work? - Answers- Reduce
heat loss up the chimney and it opens when burners fire and closes during the off cycle
What is Static Pressure in a furnace?, how is it measured?, and what standard must it
meet? - Answers- The pressure in the furnace at 90 degrees. It's measured with a
manometer It must meet Manufacturers Rating plate standard
What are the possible causes of abnormal Static Pressure results? - Answers- Dirty Air
Filters andBlocked AC Evaporator Coil
A Tee is required to be installed off the PVC 636 pipe, what is the component that
should be attached? - Answers- A Neutralizer with a hose leading to the drain trap
In the event no sewer drain is present how is condensation water mitigated? - Answers-
A Condensation Pump
What is the AFUE rating of a typical medium efficiency furnace? - Answers- 78% - 82%
Which category of furnace is standard atmospheric appliance? - Answers- Category 1
Is a fan necessary to move the flue gases through a gravity vent? Why? - Answers- No,
hot air rises.
Are high-efficiency furnaces power vented? - Answers- Yes
Which Vent is the most heat resistant? - Answers- Type A
On a forced draft burner, where is the fan located? - Answers- Upstream from the
combustion chamber.
What is the disadvantage of oversizing a furnace? - Answers- Inefficiency
How is the delivered air volume adjusted if a belt-drive fan motor is being used? -
Answers- Adjusting the pulleys of the motor
Where must a furnace air filter be located and which direction? - Answers- Arrow must
face the negative pressure side of the Fan
