A direct spark ignition (DSI) system is designed to:
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Name four types of gas burners.
The heat anticipator is located in which component? (Thermostat or sub base)
The disadvantage in using a contactor to open and close the circuit to the electric heating element is the.
What is difference between a hard and a soft lockout?
Describe a Split-Phase motor:
State the formula used for determining the cubic feet per minute (CFM) air flow across the furnace heating elements.
The heat that has been absorbed in the Evaporator is rejected in the _______ .
A condensing gas furnace uses__________ from a condenser type heat exchanger to improve the furnace efficiency
What is a flame rollout safety switch used for in heating applications?
A process where the combustion blower motor runs for a specified time period before the furnace lights to ensure safe ignition is called:
Advantage of a closed loop heat pump system
Low voltage controls are used for which of the following reasons?
The major components of closed loop heat pump systems
What is smart valve system?
A common unit of electrical power is?
It takes approximately____________ cubic feet of air to produce 2 cubic feet of oxygen to mix with 1 cubic foot of natural gas to produce 1,050 Btu when burned.
______ load is when a space is to Hot
Describe the function of a multi poise or multipositional furnace.
What is the function of the servo pressure regulator in a modern combination gas valve?
What is excess air?
The limit switch shuts off the unit if:
The Manifold Gauges are useful as a diagnostic tool because they?
True or Falls: an orifice measures the quantity of gas to the burner as well as direct the gas stream.
When the furnace is two stage, there are how many heat anticipator
A (n)____________ is a furnace's electronic module timed safety shutdown period which may reoccur many times.
Electric unit heaters are usually installed:
At what rate of speed must the motor attain before the start relay disconnects the start winding and capacitor?
When there is a pilot proving device failure and both the pilot and main gas valves are shut down, there is: