TSSA G2 CORRECT EXAM ANSWERS AND
QUESTIONS SET A+
✔✔The flow rate of water passing through a heating coil of an air handler is controlled
by the:
A. aquastat on the water heater
B. balancing valve on the heating loop
C. mixing valve on the heating loop
D. mixing valve on the domestic hot water system - ✔✔B
✔✔The faster the flow of water through the heating loop of a combination heating
system employing a water heater for supplying domestic hot water and space heating:
A. The greater the heat transfer to the heated medium
B. The lower the water temperature drop through the heating loop
C. The higher the noise level from the pump and piping system
D. All available choices - ✔✔B
✔✔A customer complains that the hot water runs out in the middle of one shower. The
water temperature coming out of the tap is 140 degrees and begins falling within one
minute. After drawing water for 5 minutes the water temperature at the bottom of the
tank is measured at 130 degrees and the burner has not come on. What is the most
likely cause?
A. The temperature control is out of calibration
B. The shower head passes too much water
C. the dip tube is cracked or broken
D. The temperature sensor is in the wrong location - ✔✔A
✔✔As the outlet temperature decreases from a water heater to the heating loop in a
combination system the:
A. Heating output from the air handler decreases
B. Heating output from the air handler increases
C. Rate of heat transfer from the water to air increases
D. Greater the temperature drop through the heating loop - ✔✔A
,✔✔On a hydronic heater system what control responds to a load change?
A. Low water cut off
B. Expansion tank
C. Flow switch
D. Aquastat - ✔✔C
✔✔Which of the hydronic controls listed below de-energizes the main burner if the
operating control fails in the closed position?
A. Low limit control
B. Temperature and pressure relief valve
C. High limit control
D. Flow switch - ✔✔C
✔✔The purpose of mixing valve on a combination system employing a water heater to
provide water for potable use and provide space heating is to
A. Mix hot water with cold water in the heating loop
B. Mix cold water with the hot water supply to the domestic plumbing system to maintain
a consistent temperature of domestic hot water
C. Mix cold water with the hot water supply to the heating loop to maintain a consistent
temperature of water in the heating loop
D. Return some of the hot water to the tank so that it does not run out of water - ✔✔C
✔✔A customer complains that the pilot goes out every once in a while. This is the
second service call for this problem this month. When the pilot is re-established, the
closed circuit millivolt test stays steady at 14 millivolts. The magnet drops out at 4
millivolts. What should be done next?
A. Replace the gas valve because the magnet is weak
B. Clean and adjust the pilot and burners
C. Replace the thermocouple
D. Check for another problem such as down draft or pilot position - ✔✔D
✔✔Combination systems are sized to deliver __________ of the calculated heat loss of
the building.
A. 90%
B. 95% to 105%
C. 120%
D. 200% - ✔✔C
✔✔The most likely cause of an intermittent hissing sound "like water dripping on
something hot" coming from a water heater is:
A. an intermittent leak in the flue that seals once the tank heats up
B. Condensation in the flue passage caused by drawing water from the tank when the
hot water has been depleted
,C. Condensation in the flue passage caused by high humidity in the combustion air
supply to the water heater
D. Condensation in the flue passage caused by high moisture content in the as supply -
✔✔B
✔✔Why is there a low limit on a hot water tank which supplies both space heating and
domestic hot water?
A. To prevent rusting in the system
B. To prevent freeze up
C. To reduce oil consumption
D. To assure a constant supply of domestic hot water - ✔✔D
✔✔Is leaded solder allowed on the heating potion of a combination domestic heating/
hot water system?
A. Yes
B. No - ✔✔Yes
✔✔A forced draft burner has a blower that produces sufficient pressure to overcome the
resistance of the:
A. burner
B. burner and the appliance
C. burner and the appliance downdraft
D. venting system - ✔✔B
✔✔What materials are approved for joining single wall vent connectors?
A. Duct tape
B. Pop rivets
C. Sheet metal screws
D. Silicone or adhesive - ✔✔C
✔✔How many Btu's are in a US gallon of oil?
A. 100,000
B. 120,000
C. 140,000
D. 175,000 - ✔✔C
✔✔A fan assist burner is?
A. Designed for better combustion
B. Designed for conversion boiler
C. Designed to overcome appliance friction
D. Designed to overcome burner resistance only - ✔✔D
, ✔✔When the required minimum clearance for a vent connector is 9" (228 mm) to
combustible material with no protection, what is the acceptable method to reduce the
clearance by 3" (76 mm)?
A. use 0.05" (12 mm) insulating millboard spaced out 0.05 (12 mm) with noncombustible
spacers
B. use 0.25" (6 mm) insulating millboard spaced out 1" (25 mm)
C. use 22 gauge sheet metal attached to the hot side of the-combustible material
D. use 28 gauge sheet metal spaced out 1" (25 mm) from the combustible material -
✔✔B
✔✔When using a gas detector such as a Drager or Gas Tec type, the most important
aspect regarding the sample tube is that the:
A. detector is within the manufacturer's date code
B. sample tube is within the manufacturer's date code
C. detector has been inspected and verified
D. the sample tube is CGA approved - ✔✔B
✔✔How far above the burner port does the centre line of the flue outlet have to be to
convert a revertible flue furnace with a natural draft burner?
A. at least 6" (150 mm)
B. less than 12" (300 mm)
C. at least 12" (300 mm)
D. at least 24" (600 mm) - ✔✔C
✔✔The vent of a direct vent propane appliance shall not terminate:
A. Within 2 ft. of a property line
B. Less than 3 ft. from a gas service regulator
C. Within 3 ft. of a mechanical air supply inlet to a building
D. Within 10 ft. of a mechanical air supply inlet to a building - ✔✔C
✔✔Which of the following is the best way to increase the furnace blower speed?
A. Open up the motor pulley
B. Close up the motor pulley
C. Install a higher horsepower fan motor
D. Increase the size of the return air duct - ✔✔B
✔✔The baffles in a hot water boiler
A. To reduce water flow
B. Clean boiler tubes
C. Premix air and gas
D. Slow hot flue gases flow - ✔✔D
✔✔A condensing furnace has:
A. One heat exchanger
QUESTIONS SET A+
✔✔The flow rate of water passing through a heating coil of an air handler is controlled
by the:
A. aquastat on the water heater
B. balancing valve on the heating loop
C. mixing valve on the heating loop
D. mixing valve on the domestic hot water system - ✔✔B
✔✔The faster the flow of water through the heating loop of a combination heating
system employing a water heater for supplying domestic hot water and space heating:
A. The greater the heat transfer to the heated medium
B. The lower the water temperature drop through the heating loop
C. The higher the noise level from the pump and piping system
D. All available choices - ✔✔B
✔✔A customer complains that the hot water runs out in the middle of one shower. The
water temperature coming out of the tap is 140 degrees and begins falling within one
minute. After drawing water for 5 minutes the water temperature at the bottom of the
tank is measured at 130 degrees and the burner has not come on. What is the most
likely cause?
A. The temperature control is out of calibration
B. The shower head passes too much water
C. the dip tube is cracked or broken
D. The temperature sensor is in the wrong location - ✔✔A
✔✔As the outlet temperature decreases from a water heater to the heating loop in a
combination system the:
A. Heating output from the air handler decreases
B. Heating output from the air handler increases
C. Rate of heat transfer from the water to air increases
D. Greater the temperature drop through the heating loop - ✔✔A
,✔✔On a hydronic heater system what control responds to a load change?
A. Low water cut off
B. Expansion tank
C. Flow switch
D. Aquastat - ✔✔C
✔✔Which of the hydronic controls listed below de-energizes the main burner if the
operating control fails in the closed position?
A. Low limit control
B. Temperature and pressure relief valve
C. High limit control
D. Flow switch - ✔✔C
✔✔The purpose of mixing valve on a combination system employing a water heater to
provide water for potable use and provide space heating is to
A. Mix hot water with cold water in the heating loop
B. Mix cold water with the hot water supply to the domestic plumbing system to maintain
a consistent temperature of domestic hot water
C. Mix cold water with the hot water supply to the heating loop to maintain a consistent
temperature of water in the heating loop
D. Return some of the hot water to the tank so that it does not run out of water - ✔✔C
✔✔A customer complains that the pilot goes out every once in a while. This is the
second service call for this problem this month. When the pilot is re-established, the
closed circuit millivolt test stays steady at 14 millivolts. The magnet drops out at 4
millivolts. What should be done next?
A. Replace the gas valve because the magnet is weak
B. Clean and adjust the pilot and burners
C. Replace the thermocouple
D. Check for another problem such as down draft or pilot position - ✔✔D
✔✔Combination systems are sized to deliver __________ of the calculated heat loss of
the building.
A. 90%
B. 95% to 105%
C. 120%
D. 200% - ✔✔C
✔✔The most likely cause of an intermittent hissing sound "like water dripping on
something hot" coming from a water heater is:
A. an intermittent leak in the flue that seals once the tank heats up
B. Condensation in the flue passage caused by drawing water from the tank when the
hot water has been depleted
,C. Condensation in the flue passage caused by high humidity in the combustion air
supply to the water heater
D. Condensation in the flue passage caused by high moisture content in the as supply -
✔✔B
✔✔Why is there a low limit on a hot water tank which supplies both space heating and
domestic hot water?
A. To prevent rusting in the system
B. To prevent freeze up
C. To reduce oil consumption
D. To assure a constant supply of domestic hot water - ✔✔D
✔✔Is leaded solder allowed on the heating potion of a combination domestic heating/
hot water system?
A. Yes
B. No - ✔✔Yes
✔✔A forced draft burner has a blower that produces sufficient pressure to overcome the
resistance of the:
A. burner
B. burner and the appliance
C. burner and the appliance downdraft
D. venting system - ✔✔B
✔✔What materials are approved for joining single wall vent connectors?
A. Duct tape
B. Pop rivets
C. Sheet metal screws
D. Silicone or adhesive - ✔✔C
✔✔How many Btu's are in a US gallon of oil?
A. 100,000
B. 120,000
C. 140,000
D. 175,000 - ✔✔C
✔✔A fan assist burner is?
A. Designed for better combustion
B. Designed for conversion boiler
C. Designed to overcome appliance friction
D. Designed to overcome burner resistance only - ✔✔D
, ✔✔When the required minimum clearance for a vent connector is 9" (228 mm) to
combustible material with no protection, what is the acceptable method to reduce the
clearance by 3" (76 mm)?
A. use 0.05" (12 mm) insulating millboard spaced out 0.05 (12 mm) with noncombustible
spacers
B. use 0.25" (6 mm) insulating millboard spaced out 1" (25 mm)
C. use 22 gauge sheet metal attached to the hot side of the-combustible material
D. use 28 gauge sheet metal spaced out 1" (25 mm) from the combustible material -
✔✔B
✔✔When using a gas detector such as a Drager or Gas Tec type, the most important
aspect regarding the sample tube is that the:
A. detector is within the manufacturer's date code
B. sample tube is within the manufacturer's date code
C. detector has been inspected and verified
D. the sample tube is CGA approved - ✔✔B
✔✔How far above the burner port does the centre line of the flue outlet have to be to
convert a revertible flue furnace with a natural draft burner?
A. at least 6" (150 mm)
B. less than 12" (300 mm)
C. at least 12" (300 mm)
D. at least 24" (600 mm) - ✔✔C
✔✔The vent of a direct vent propane appliance shall not terminate:
A. Within 2 ft. of a property line
B. Less than 3 ft. from a gas service regulator
C. Within 3 ft. of a mechanical air supply inlet to a building
D. Within 10 ft. of a mechanical air supply inlet to a building - ✔✔C
✔✔Which of the following is the best way to increase the furnace blower speed?
A. Open up the motor pulley
B. Close up the motor pulley
C. Install a higher horsepower fan motor
D. Increase the size of the return air duct - ✔✔B
✔✔The baffles in a hot water boiler
A. To reduce water flow
B. Clean boiler tubes
C. Premix air and gas
D. Slow hot flue gases flow - ✔✔D
✔✔A condensing furnace has:
A. One heat exchanger
