In a commercial location, there may actually be several fans operated by the ____.
a. control relay (CR)
b. start capacitor (SC)
c. Indoor Fan Relay (IFR)
d. start relay (SR)
c. Indoor Fan Relay (IFR)
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?When a spark plug is disabled and the noise becomes louder, what could this be?
What will be an ideal response?
What does amplification mean in indoor air quality terms?
A) Noise pollution that is increased in volume because of metal ducts B) A contaminant's ability to grow and spread C) The combined effect of multiple forms of pollutants D) The transmitting of mechanical unit sounds through short metal returns
Which is a primary safety requirement when replacing an older furnace?
A) properly discarding used materials B) relocating the thermostat C) removing the jumper D) properly grounding the furnace cabinet
What type of metering device do most packaged water source heat pumps use?
A) a single bi-flow thermostatic expansion valve B) a single capillary tube C) a single low side float control D) a single orifice style metering device