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18 Cards in this Set
- Front
- Back
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On what principle does a category 1 Appliance vent the products of combustion to the outdoors |
Convection |
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How are blower motors controlled if a temperature sensor is not used |
A time delay relay turns it on |
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What is the function of a pressure switch on a category 1 Appliance with an induced draft fan |
To prove that the IDF is moving air through the heat exchanger |
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What is the purpose of the high temperature limit controls mounted in the blower Outlet |
These are auxiliary High limits when the furnace is used as a downflow |
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What is the function of a flame rollout switch |
To shut off gas valve if the Flames exit the combustion chamber |
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Why is an induced draft fan required on a mid efficient furnace |
To overcome the Restriction of the heat exchanger |
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What pressure would be expected in the vent connector of a fantasist appliance when the pilot burner is firing |
Negative pressure |
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If the pressure switch malfunctioned what would happen on Appliance startup |
The induced draft fan will come on but nothing else will occur |
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What would happen if the vent terminal was partially blocked with ice or snow and there's a call for heat |
The IDF will start but the appliance will not fire |
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What are the only holes that may be cut into a furnace cabinet |
For the return air duct connection |
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In Alberta which rating plate elevation should be used |
High altitude between 2000 and 4500 feet above sea level |
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What type of vent would be required for a category 1 Appliance |
A type B vent |
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What type of vent connector would be required for a category 1 Appliance |
A single wall vent connector is usually sufficient but in some cases a double wall vent connector is required |
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Where is the manometer connected to a 10 manifold pressure |
Downstream of the appliance regulator with the main burner firing |
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What is the importance of taking the amperage draw of the control system |
To set the Heat anticipator |
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What the voltage is usually supplied through the gas valve on a mid efficient furnace |
24 volts ac |
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How would the pressure setting of a pressure switch be confirmed |
Connect a draft gauge to the venting system in compared to the switch rating |
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What would be the minimum size of a vent that serves a fantasist furnace |
3 in |
