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343 Cards in this Set
- Front
- Back
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What is another name for a natural draft burner? |
Atmospheric or inspirated |
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Which part of the natural draft burner causes a negative pressure to entrain air? |
The Venturi |
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What is the main difference between a closed burner and an open burner? |
The closed burner is a sealed combustion chamber |
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Which of the burner would be classified as inspiring? |
Natural draft or atmospheric |
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What device can be added to an infra red tube heater to overcome the resistance of long, radiant tubes? |
A fan near the tube outlet |
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Which type of burner varies the heating rate by controlling high velocity air flow and gas pressure simultaneously? |
A Blast Burner |
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Which burner resembles an atmospheric burner but has no primary air shutter? |
A fan assist burner |
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On what appliance would you find a flash tube? |
A range top burner |
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What causes primary air to be drawn into an atmospheric burner ? |
A slight negative pressure created by Venturi action |
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What is required from a burner that has a varying output rate? |
A good turndown ratio |
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What is the purpose of the induced draft fan on a mod efficiency furnace? |
The fan overcomes the resistance of the heat exchanger |
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How is positive pressure generated by an induced draft fan negated? |
By enlarging the fan outlet |
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A standing pilot can have an input of 3% of the main burner rating. What is the maximum input for an intermittent pilot? |
5% of the main burner rating |
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Why is condensing an appliance so efficient? |
The latent heat of the water in the flu gas is extracted |
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What material is required to vent category 4 condensing appliances? |
The material must be ULC S636 approved |
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What is the function of the proving switch ( pressure switch) on a category 1 fan assist appliance? |
It proves there is air moving the heat exchanger |
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What makes an appliance forced draft? |
A fan is used to force air into the combustion chamber |
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Before an appliance can converted from natural gas to Propane, what must be done? |
The appliance must be checked for serviceability |
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Who is responsible to instruct the end user in the service and maintenance of an appliance? |
The installer |
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Who is responsible to ensure the appliance is in safe working order? |
The person who fires it. |
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What is required be done before start up procedures for an appliance commences? |
Conduct visual inspection Confirm venting and air supply adequate Check that wiring is complete and verified |
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What is a multi poise furnace? |
A multi position furnace |
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How is the high temperature limit control in a forced air furnace tested? |
The furnace is fired and air flow stopped |
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What is the maximum setting for a high temp limit control in a directed air furnace ? |
250F |
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What is the lowest return air temperature that a forced air appliance must be subjected to? Highest? |
55 F 80F |
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How can you determine the correct installation position for multi poise furnace? |
Consult the install procedures in instruction manual |
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What test would be conducted on a direct fire furnace that would not be required for for other types of appliances? |
Temperature rise across the appliance |
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How would the high temperature limit control be tested in a forced air furnace? |
Stop the air flow of the appliance while the burner is firing |
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What is the safety relief valve on a hot water boiler used for? |
The valve prevents pressure in the boiler from getting too high |
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What is the main difference between an open tube burner and a ported tube burner? |
The ported tube burner is an upshot burner while the open tube is an inshot burner |
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Why were induced draft fans installed on appliances? |
The fan overcomes the restriction in the heat exchanger |
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What poisonous components is created with incomplete combustion? |
Carbon monoxide |
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What could uncontrolled combustion result in? |
An explosion |
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What difference would be noticed between an induced draft burner and an atmospheric burner? |
Atmospheric burner will always be upshot |
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Why would an induced draft burner be noisier than an atmospheric burner? |
Increased air velocity creates more noise |
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Why is there a mechanical tube connection ( plastic tube) between the induced draft fan and the pressure switch? |
Proves the fan is moving air through the appliance |
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Before starting ( commissioning) an appliance, what should be done? |
The appliance information booklet should be read |
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Why would multiple flame roll out switches be installed in a forced air furnace? |
This enables the appliance to be multi-poise. |
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What type of efficiency is used to describe the overall efficiency of an appliance? |
Annual fuel utilization |
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How was the efficiency of central hearing appliances increased to mid efficiency? |
The heat exchanger was redesigned |
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How is the efficiency of a furnace increased to high efficient range? |
Water vapour in the glue gases are condensed |
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What is the main difference between a mid efficient and high efficient appliance? |
The high efficient appliance condenses the water vapour in the flu gas |
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What device proves the induced draft fan ( venting fan) is moving air? |
The pressure switch |
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What category appliance would a draft hood be? |
Category 1 |
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What is the pressure in the vent opening servicing an operating Category 1 appliance? |
Non-Positive |
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Which category of appliance condenses the water vapour in the flu gas? |
Category 4 |
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What type of vent material would be normally used in a category 1 appliance? |
Type B vent |
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A forced draft burner utilizes a fan of sufficient size to: |
Overcome the restriction of the appliance and the burner |
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Where is the induction fan located on a fan assist appliance? |
At the flu outlet of the appliance |
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Before the gas fitter leaves any gas appliance they have worked on they must ensure: |
The operating instructions and wiring diagrams are left with the appliance The appliance is running safely under all rates of firing All safety and limits controls are operating normally |
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What combustion chamber designs are not suitable for conversion? |
Revertible |
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Who is responsible for instructing the customer of the safe operation of the appliance ? |
The installer. |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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How are atmospheric burners classified as to air mixing? |
Insprirated and open burners |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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How are atmospheric burners classified as to air mixing? |
Insprirated and open burners |
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What are some of the design features all burners have in common? |
Fuel and Air delivery to combustion chamber, mixing of fuel and air Safe ignition Complete combustion |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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How are atmospheric burners classified as to air mixing? |
Insprirated and open burners |
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What are some of the design features all burners have in common? |
Fuel and Air delivery to combustion chamber, mixing of fuel and air Safe ignition Complete combustion |
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What is the main difference between a closed and open burner? |
By the way the combustion air is applied. Closed-Air through Burner Open - air through firewall of combustion chamber |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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How are atmospheric burners classified as to air mixing? |
Insprirated and open burners |
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What are some of the design features all burners have in common? |
Fuel and Air delivery to combustion chamber, mixing of fuel and air Safe ignition Complete combustion |
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What is the main difference between a closed and open burner? |
By the way the combustion air is applied. Closed-Air through Burner Open - air through firewall of combustion chamber |
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What is modulated operation in regard to a gas fired appliance? |
Modulated operation is firing an appliance over a range of operating points |
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What is a problem that could be expected if the quantity of flow through the appliance heat exchanger is not regulated in conjunction with fuel flow? |
Premature destruction of the heat exchanger from the effects of heat or flame rollout from the combustion chamber. |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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How are atmospheric burners classified as to air mixing? |
Insprirated and open burners |
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What are some of the design features all burners have in common? |
Fuel and Air delivery to combustion chamber, mixing of fuel and air Safe ignition Complete combustion |
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What is the main difference between a closed and open burner? |
By the way the combustion air is applied. Closed-Air through Burner Open - air through firewall of combustion chamber |
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What is modulated operation in regard to a gas fired appliance? |
Modulated operation is firing an appliance over a range of operating points |
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What is a problem that could be expected if the quantity of flow through the appliance heat exchanger is not regulated in conjunction with fuel flow? |
Premature destruction of the heat exchanger from the effects of heat or flame rollout from the combustion chamber. |
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If the water vapour in the products of combustion is allowed to condense, what could result to the metallic products used to vent the gases produced by combustion? |
Deterioration of the metal products used by condensation of water vapour into acidic water. |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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How are atmospheric burners classified as to air mixing? |
Insprirated and open burners |
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What are some of the design features all burners have in common? |
Fuel and Air delivery to combustion chamber, mixing of fuel and air Safe ignition Complete combustion |
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What is the main difference between a closed and open burner? |
By the way the combustion air is applied. Closed-Air through Burner Open - air through firewall of combustion chamber |
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What is modulated operation in regard to a gas fired appliance? |
Modulated operation is firing an appliance over a range of operating points |
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What is a problem that could be expected if the quantity of flow through the appliance heat exchanger is not regulated in conjunction with fuel flow? |
Premature destruction of the heat exchanger from the effects of heat or flame rollout from the combustion chamber. |
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If the water vapour in the products of combustion is allowed to condense, what could result to the metallic products used to vent the gases produced by combustion? |
Deterioration of the metal products used by condensation of water vapour into acidic water. |
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What device will shut off fuel to the burner if an overheat condition is detected in an appliances heat exchanger? |
A high limit switch |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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How are atmospheric burners classified as to air mixing? |
Insprirated and open burners |
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What are some of the design features all burners have in common? |
Fuel and Air delivery to combustion chamber, mixing of fuel and air Safe ignition Complete combustion |
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What is the main difference between a closed and open burner? |
By the way the combustion air is applied. Closed-Air through Burner Open - air through firewall of combustion chamber |
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What is modulated operation in regard to a gas fired appliance? |
Modulated operation is firing an appliance over a range of operating points |
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What is a problem that could be expected if the quantity of flow through the appliance heat exchanger is not regulated in conjunction with fuel flow? |
Premature destruction of the heat exchanger from the effects of heat or flame rollout from the combustion chamber. |
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If the water vapour in the products of combustion is allowed to condense, what could result to the metallic products used to vent the gases produced by combustion? |
Deterioration of the metal products used by condensation of water vapour into acidic water. |
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What device will shut off fuel to the burner if an overheat condition is detected in an appliances heat exchanger? |
A high limit switch |
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How does adequate air flow through the flow channels of an appliance heat exchanger prevent damage to the heat exchanger? |
By ensuring cooling air flows the heat exchanger in conjunction with the products of combustion |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What action can be expected if burner flames roll out of the appliance heat exchanger? |
Damage to components from the heat to direct flame |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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How are atmospheric burners classified as to air mixing? |
Insprirated and open burners |
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What are some of the design features all burners have in common? |
Fuel and Air delivery to combustion chamber, mixing of fuel and air Safe ignition Complete combustion |
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What is the main difference between a closed and open burner? |
By the way the combustion air is applied. Closed-Air through Burner Open - air through firewall of combustion chamber |
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What is modulated operation in regard to a gas fired appliance? |
Modulated operation is firing an appliance over a range of operating points |
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What is a problem that could be expected if the quantity of flow through the appliance heat exchanger is not regulated in conjunction with fuel flow? |
Premature destruction of the heat exchanger from the effects of heat or flame rollout from the combustion chamber. |
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If the water vapour in the products of combustion is allowed to condense, what could result to the metallic products used to vent the gases produced by combustion? |
Deterioration of the metal products used by condensation of water vapour into acidic water. |
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What device will shut off fuel to the burner if an overheat condition is detected in an appliances heat exchanger? |
A high limit switch |
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How does adequate air flow through the flow channels of an appliance heat exchanger prevent damage to the heat exchanger? |
By ensuring cooling air flows the heat exchanger in conjunction with the products of combustion |
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What are the two main burner classifications? |
Atmospheric/Natural Draft Power Burners |
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What action can be expected if burner flames roll out of the appliance heat exchanger? |
Damage to components from the heat to direct flame |
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What device prevents damage to an appliance components from flame roll out? |
A flame roll out switch or switches. |
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What is the main difference between power burners and atmospheric burners? |
Air is drawn through a Venturi in an Atmospheric burner and a fan upstream of the gas/air mixture zone forces air in. |
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How are atmospheric burners classified as to air mixing? |
Insprirated and open burners |
|
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What are some of the design features all burners have in common? |
Fuel and Air delivery to combustion chamber, mixing of fuel and air Safe ignition Complete combustion |
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What is the main difference between a closed and open burner? |
By the way the combustion air is applied. Closed-Air through Burner Open - air through firewall of combustion chamber |
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What is modulated operation in regard to a gas fired appliance? |
Modulated operation is firing an appliance over a range of operating points |
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What is a problem that could be expected if the quantity of flow through the appliance heat exchanger is not regulated in conjunction with fuel flow? |
Premature destruction of the heat exchanger from the effects of heat or flame rollout from the combustion chamber. |
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If the water vapour in the products of combustion is allowed to condense, what could result to the metallic products used to vent the gases produced by combustion? |
Deterioration of the metal products used by condensation of water vapour into acidic water. |
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What device will shut off fuel to the burner if an overheat condition is detected in an appliances heat exchanger? |
A high limit switch |
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How does adequate air flow through the flow channels of an appliance heat exchanger prevent damage to the heat exchanger? |
By ensuring cooling air flows the heat exchanger in conjunction with the products of combustion |
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What are two dangerous compounds that may be created as products of combustion of fuel that is not completely burned? |
Carbon Monoxide Aldehyde |
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What are two dangerous compounds that may be created as products of combustion of fuel that is not completely burned? |
Carbon Monoxide Aldehyde |
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What is the basic differ between as aspirated burner and inspirited burner? |
Atmospheric operate through natural draft Power burners require a fan in their operation |
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What are two dangerous compounds that may be created as products of combustion of fuel that is not completely burned? |
Carbon Monoxide Aldehyde |
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What is the basic differ between as aspirated burner and inspirited burner? |
In their manner of operation. Aspirated burners entrain fuel with air Inspirated entrain air with fuel |
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What does flashback mean in relation to burners? |
Flame inverts through the burner ports and fuel is burned inside the burner housing |
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What are the 4 main categories of power burners? |
Aspirated burners , mechanically pre mix burners Nozzle mixing burners Injection burners |
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What are the 4 main categories of power burners? |
Aspirated burners , mechanically pre mix burners Nozzle mixing burners Injection burners |
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What does the term stack action refer to? |
Natural draft created by buoyancy through a vertical vent pipe assembly. |
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What are the 4 main categories of power burners? |
Aspirated burners , mechanically pre mix burners Nozzle mixing burners Injection burners |
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What does the term stack action refer to? |
Natural draft created by buoyancy through a vertical vent pipe assembly. |
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What are the products which result from the complete combustion of fuel in air? |
Carbon dioxide and water vapour |
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What are the 4 main categories of power burners? |
Aspirated burners , mechanically pre mix burners Nozzle mixing burners Injection burners |
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What does the term stack action refer to? |
Natural draft created by buoyancy through a vertical vent pipe assembly. |
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What are the products which result from the complete combustion of fuel in air? |
Carbon dioxide and water vapour |
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What additional devices provide venting of the products of combustion in a radiant tube burner that has a high degree of restriction to flow due to length? |
An induced draft fan |
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What are the 4 main categories of power burners? |
Aspirated burners , mechanically pre mix burners Nozzle mixing burners Injection burners |
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What does the term stack action refer to? |
Natural draft created by buoyancy through a vertical vent pipe assembly. |
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What are the products which result from the complete combustion of fuel in air? |
Carbon dioxide and water vapour |
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What additional devices provide venting of the products of combustion in a radiant tube burner that has a high degree of restriction to flow due to length? |
An induced draft fan |
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How is a flashback prevented in a mechanical premix burner? |
By ensuring mixing fuel exits burner faster than the speed of flame can burn it. |
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What is modulated operation in regard to a gas fired appliance? |
Modulated operation is firing an appliance over a range of operating points |
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What is the major difference between a natural draft appliances heat exchanger and a mid efficient appliances heat exchanger? |
The resistance of flow of the products of combustion. A natural draft exchanger has considerably less resistance to flow. |
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How can you ensure a replacement component for an appliance will function as intended? |
By performing operational checks after component replacement |
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How can you ensure a replacement component for an appliance will function as intended? |
By performing operational checks after component replacement |
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Why is a fan used in a mid efficient appliance when one is not needed for a natural draft appliance? |
To overcome the resistance built in to mid efficiency heat exchangers flow channels |
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How can you ensure a replacement component for an appliance will function as intended? |
By performing operational checks after component replacement |
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Why is a fan used in a mid efficient appliance when one is not needed for a natural draft appliance? |
To overcome the resistance built in to mid efficiency heat exchangers flow channels |
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What is the effect of doubling flow rate through a closed flow channel? |
Quadruples resistance to flow |
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How can you ensure a replacement component for an appliance will function as intended? |
By performing operational checks after component replacement |
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Why is a fan used in a mid efficient appliance when one is not needed for a natural draft appliance? |
To overcome the resistance built in to mid efficiency heat exchangers flow channels |
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What is the effect of doubling flow rate through a closed flow channel? |
Quadruples resistance to flow |
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What are some of the major design features for space heating appliance heat exchangers? |
Good heat collection and dispersal Designed to resist the effects of heat Keep the products of combustion and air for space heating separated |
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How can you ensure a replacement component for an appliance will function as intended? |
By performing operational checks after component replacement |
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Why is a fan used in a mid efficient appliance when one is not needed for a natural draft appliance? |
To overcome the resistance built in to mid efficiency heat exchangers flow channels |
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What is the effect of doubling flow rate through a closed flow channel? |
Quadruples resistance to flow |
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What are some of the major design features for space heating appliance heat exchangers? |
Good heat collection and dispersal Designed to resist the effects of heat Keep the products of combustion and air for space heating separated |
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How is the static pressure created by a centrifugal fan counteracted by discharge housing design? |
Through a gradual then sudden enlargement designed into the discharge housing |
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How can you ensure a replacement component for an appliance will function as intended? |
By performing operational checks after component replacement |
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Why is a fan used in a mid efficient appliance when one is not needed for a natural draft appliance? |
To overcome the resistance built in to mid efficiency heat exchangers flow channels |
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What is the effect of doubling flow rate through a closed flow channel? |
Quadruples resistance to flow |
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What are some of the major design features for space heating appliance heat exchangers? |
Good heat collection and dispersal Designed to resist the effects of heat Keep the products of combustion and air for space heating separated |
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How is the static pressure created by a centrifugal fan counteracted by discharge housing design? |
Through a gradual then sudden enlargement designed into the discharge housing |
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What operating conditions does an induced draft fan help to provide for a mid efficiency appliance? |
Consistent, precise, and reliable air supply and overcoming the resistance of the appliance heat exchanger. |
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|
How can you ensure a replacement component for an appliance will function as intended? |
By performing operational checks after component replacement |
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Why is a fan used in a mid efficient appliance when one is not needed for a natural draft appliance? |
To overcome the resistance built in to mid efficiency heat exchangers flow channels |
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What is the effect of doubling flow rate through a closed flow channel? |
Quadruples resistance to flow |
|
|
What are some of the major design features for space heating appliance heat exchangers? |
Good heat collection and dispersal Designed to resist the effects of heat Keep the products of combustion and air for space heating separated |
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How is the static pressure created by a centrifugal fan counteracted by discharge housing design? |
Through a gradual then sudden enlargement designed into the discharge housing |
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What operating conditions does an induced draft fan help to provide for a mid efficiency appliance? |
Consistent, precise, and reliable air supply and overcoming the resistance of the appliance heat exchanger. |
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Why are operational checks necessary when components of a space heating appliance are replaced? |
To ensure the safety of building occupants by ensuring the appliance will function as designed as intended |
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How can you ensure a replacement component for an appliance will function as intended? |
By performing operational checks after component replacement |
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Why is a fan used in a mid efficient appliance when one is not needed for a natural draft appliance? |
To overcome the resistance built in to mid efficiency heat exchangers flow channels |
|
|
What is the effect of doubling flow rate through a closed flow channel? |
Quadruples resistance to flow |
|
|
What are some of the major design features for space heating appliance heat exchangers? |
Good heat collection and dispersal Designed to resist the effects of heat Keep the products of combustion and air for space heating separated |
|
|
How is the static pressure created by a centrifugal fan counteracted by discharge housing design? |
Through a gradual then sudden enlargement designed into the discharge housing |
|
|
What operating conditions does an induced draft fan help to provide for a mid efficiency appliance? |
Consistent, precise, and reliable air supply and overcoming the resistance of the appliance heat exchanger. |
|
|
Why are operational checks necessary when components of a space heating appliance are replaced? |
To ensure the safety of building occupants by ensuring the appliance will function as designed as intended |
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What effects could you expect in the operation of an appliance if an induced draft fan is replaced with another that has operating characteristics in excess of the original? |
Excess air flow through the appliance leading to the creation of undesirable operating conditions |
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How can you ensure a replacement component for an appliance will function as intended? |
By performing operational checks after component replacement |
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Why is a fan used in a mid efficient appliance when one is not needed for a natural draft appliance? |
To overcome the resistance built in to mid efficiency heat exchangers flow channels |
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What is the effect of doubling flow rate through a closed flow channel? |
Quadruples resistance to flow |
|
|
What are some of the major design features for space heating appliance heat exchangers? |
Good heat collection and dispersal Designed to resist the effects of heat Keep the products of combustion and air for space heating separated |
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|
How is the static pressure created by a centrifugal fan counteracted by discharge housing design? |
Through a gradual then sudden enlargement designed into the discharge housing |
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What operating conditions does an induced draft fan help to provide for a mid efficiency appliance? |
Consistent, precise, and reliable air supply and overcoming the resistance of the appliance heat exchanger. |
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Why are operational checks necessary when components of a space heating appliance are replaced? |
To ensure the safety of building occupants by ensuring the appliance will function as designed as intended |
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What effects could you expect in the operation of an appliance if an induced draft fan is replaced with another that has operating characteristics in excess of the original? |
Excess air flow through the appliance leading to the creation of undesirable operating conditions |
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List some of the substances that should not be in the immediate area of a gas fired appliance? |
Combustible substances or ones which produce flammable vapours, chemical fumes that may cause damage to the appliance or could create an explosive hazard |
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Reviewed |
Before |
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What should you do if damage is noted on the packaging of an appliance? |
Request an immediate inspection and a report of damage from the transport agent |
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What should you do if damage is noted on the packaging of an appliance? |
Request an immediate inspection and a report of damage from the transport agent |
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Why do manufactures of gas burning appliances include such an extensive list of warnings in their installation and operating manuals? |
They have no idea of the qualifications of the person doing repair work and many of the issues earned against have happened in the past |
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What should you do if damage is noted on the packaging of an appliance? |
Request an immediate inspection and a report of damage from the transport agent |
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Why do manufactures of gas burning appliances include such an extensive list of warnings in their installation and operating manuals? |
They have no idea of the qualifications of the person doing repair work and many of the issues earned against have happened in the past |
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What is flame impingement? |
Burner flame coming too close to or touching a surface where cooling of the flame can occur |
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Where can LWCO be installed? |
Anywhere above the boiler |
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Where can LWCO be installed? |
Anywhere above the boiler |
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Natural gas needs how many cubic feet of air to supply 1cuft of Natural gas for combustion? |
10 cuft |
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Where can LWCO be installed? |
Anywhere above the boiler |
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Natural gas needs how many cubic feet of air to supply 1cuft of Natural gas for combustion? |
10 cuft |
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How many cuft of air is needed to supply 1 cuft of Propane for proper combustion? |
24 cuft |
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A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
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A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
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What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
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A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
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What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
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How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
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A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
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How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
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Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
Which burner has a fan before the burner and after the heat exchanger? |
Balanced draft |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
Which burner has a fan before the burner and after the heat exchanger? |
Balanced draft |
|
|
Which burner has a fan after the heat exchanger? |
Draft induced |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
Which burner has a fan before the burner and after the heat exchanger? |
Balanced draft |
|
|
Which burner has a fan after the heat exchanger? |
Draft induced |
|
|
Why would manufacturers install multiple flame roll out switches? |
The appliance is multi poise |
|
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A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
Which burner is commonly found in residential induced draft boilers? |
Ported Tube |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
Which burner has a fan before the burner and after the heat exchanger? |
Balanced draft |
|
|
Which burner has a fan after the heat exchanger? |
Draft induced |
|
|
Why would manufacturers install multiple flame roll out switches? |
The appliance is multi poise |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
Which burner is commonly found in residential induced draft boilers? |
Ported Tube |
|
|
What is the minimum temp return air a heat exchanger should be exposed to? |
55F |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
Which burner has a fan before the burner and after the heat exchanger? |
Balanced draft |
|
|
Which burner has a fan after the heat exchanger? |
Draft induced |
|
|
Why would manufacturers install multiple flame roll out switches? |
The appliance is multi poise |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
Which burner is commonly found in residential induced draft boilers? |
Ported Tube |
|
|
What is the minimum temp return air a heat exchanger should be exposed to? |
55F |
|
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What is the most common burner type for radiant tube heaters? |
Monoport |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
Which burner has a fan before the burner and after the heat exchanger? |
Balanced draft |
|
|
Which burner has a fan after the heat exchanger? |
Draft induced |
|
|
Why would manufacturers install multiple flame roll out switches? |
The appliance is multi poise |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
Which burner is commonly found in residential induced draft boilers? |
Ported Tube |
|
|
What is the minimum temp return air a heat exchanger should be exposed to? |
55F |
|
|
What is the most common burner type for radiant tube heaters? |
Monoport |
|
|
What is a major difference between atmospheric burners and induced draft burners? |
Air shutters |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
Which burner has a fan before the burner and after the heat exchanger? |
Balanced draft |
|
|
Which burner has a fan after the heat exchanger? |
Draft induced |
|
|
Why would manufacturers install multiple flame roll out switches? |
The appliance is multi poise |
|
|
A fan cuz burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
Which burner is commonly found in residential induced draft boilers? |
Ported Tube |
|
|
What is the minimum temp return air a heat exchanger should be exposed to? |
55F |
|
|
What is the most common burner type for radiant tube heaters? |
Monoport |
|
|
What is a major difference between atmospheric burners and induced draft burners? |
Air shutters |
|
|
To condense 1lb of water vapour into liquid the vapour must release ______BTU’s |
970 |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
Which burner has a fan before the burner and after the heat exchanger? |
Balanced draft |
|
|
Which burner has a fan after the heat exchanger? |
Draft induced |
|
|
Why would manufacturers install multiple flame roll out switches? |
The appliance is multi poise |
|
|
A fan mix burner is driven by gas escaping from holes in the fan which turns the fan. Which burner type is most similar? |
Power Burner Fan |
|
|
What function does a flash tube serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
What is the minimum temp return air a heat exchanger should be exposed to? |
55F |
|
|
What is the most common burner type for radiant tube heaters? |
Monoport |
|
|
What is a major difference between atmospheric burners and induced draft burners? |
Air shutters |
|
|
To condense 1lb of water vapour into liquid the vapour must release ______BTU’s |
970 |
|
|
Mechanical pre mix burners use air mixed in the blower housing and forced from there to a _____________burner mounted in the sidewall of the combustion chamber |
Nozzle type closed burner |
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|
HWH have a separate high temp switch mounted near the top of the boiler and underneath the tank insulation . What is it called? |
ECO ( dc mv) |
|
|
What function does a flash serve ? |
It allows multiple burners to be ignited by a centrally located pilot |
|
|
How are gas and air introduced in an aspirated burner? |
The flow of air entrains the gas |
|
|
Why does an inducer fan not create a positive pressure in the vent system? |
Fan discharge is enlarged |
|
|
What is the maximum temp B Vent is rated for? |
470 F |
|
|
When a fan assisted appliance is connected to a vent, what causes the vent draft? |
Convection |
|
|
What condition activates a combustion air proving switch? |
Negative pressure |
|
|
Which burner has a fan before the burner and after the heat exchanger? |
Balanced draft |
|
|
Which burner has a fan after the heat exchanger? |
Draft induced |
|
|
Why would manufacturers install multiple flame roll out switches? |
The appliance is multi poise |
|
|
RPM = |
FrequencyX 120/ # of poles |
