Most heat anticipators are _______ (fixed resistance or variable resistance)
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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
A glow coil is used to
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?
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.