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A small microprocessor with integrated circuits mounted on a board to control the logic or sequencer of events of the furnace is:
Natural gas is composed of 90 to 95 %
Power passing devices are wired in ___________ (series or parallel).
What are four factors that determine the efficiency of a furnace?
An orifice is a drilled hole in a ____________.
Flame current measured in ___________.
Advantages of single duct variable air volume systems (3)
The low voltage thermostat is used for central electric heat because it is compact, it is responsive, and
Most electric baseboard units are ________ heaters.
low side markings are in _______ increments?
True or False: A thermocouple develops direct current and voltage.
Large open spaces with few windows and uniform loads might be best served by this HVAC system
A combination gas valve that has a built-in electronic module in its body is:
When would a combustion blower ever interpurge a furnace's heat exchanger?
Most heat anticipators are _______ (fixed resistance or variable resistance)
A furnace that can be positioned in more that one position is a:
Three variations of a single duct constant air volume system
What is Alternating current?
The _____________ thermostat is commonly used for forced air electric furnace installations.
