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What is the approximate oxygen content of air?
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T/F The latent heat BTU's and the refrigeration effect BTU'S can be the same for a refrigerant.
The heat anticipator differs from the cooling anticipator (True or False)
A furnace that has a sealed combustion chamber and its combustion air comes from outside the conditioned space is a:
The ________ is the medium that picks up and carries the heat in the Refrigeration cycle.
The air flowing from the air Conditioned unit to the conditioned Space is known as _______.
______ load is when a space is to cold
Natural gas,
Characteristics of a Hydronic convector system
What is a circuit breaker?
What is an ohm?
What is the current rating of a 7.5 kw heater operating at 230 volts?
Refrigerant properties can be classified as ______ and _______
Define the dew point temperature as it applies to a condensing furnace.
The type of system is appropriate for perimeter zones with a wide range of heating and cooling needs, and where humidity control is not required.
A _______ _________ sample is taken from the flue gas to check the efficiency of a gas furnace.
The major components of Fan-Coil systems (6)
Describe the two types of pilot lights.
Why is metal vent often preferred rather than a masonry chimney?
Disadvantages of closed loop heat pump systems
Variations for Fan-Coil Systems
A limit switch or control is used to:
The air temperature at the outlet grilles of an electric heating system is considered (hot or warm) compared to a gas furnace.
What is direct current?
A building with multiple zones which are located all or mostly at the perimeter might use this type of system
Major components of packaged terminal units
The type of material used for resistance wire in electric heat is
What is dilution air?
Manifold gauge pressure hoses should be checked or replaced on a regular basis because.
Central forced air electric furnaces frequently use _________ to start and stop multiple heating circuits.
Describe the difference between a forced draft system and an induced draft system.
T/F The Enthalpy(BTU's) of the saturated gas minus the Enthalpy(BTU's) of the liquid is equal to the latent heat(BTU's)
4 grains of moisture in the air the air can hold 16 what is relative humidity?
Another name for remote sensing in a flame rectification system is
The sequencer uses _________ (high or low) voltage control power to start and stop the electric heaters.
Briefly describe a direct burner gas valve system.
Combustion is sometimes expressed as
What is meant by prepurging a heat exchanger?
What is the ideal ceiling height range for a boiler room?
The kw rating of an electric of an electric heater is the ____________(temperature rating, power rating, voltage rating, or name of the power company)
Briefly describe an intermittent pilot gas valve system.
What is an integrated furnace controller (IFC)?
Five disadvantages of packaged terminal units
Explain why the preceding flame proving systems called safety devices.
Base board heaters transfer heat by
The center Hose and center chamber on the manifold is used to?
These 4 heating and cooling systems minimize operating costs
Two advantages of single duct constant air volume systems
Where are auxiliary limit switches used in heating applications?
The most versatile and widely used system used to heat and cool large buildings.
