chapter 1-2
What does PPE stand for
Personal protection equipment
What are the three things required for combustion?
heat, fuel, and oxygen
A natural (atmospheric) draft furnace with an efficiency of 83% or less is what category?
category 1
does a direct ignition furnace use a pilot flame?
NO
Butane
When converting a furnace from Natural gas to LP it is important to change what on the unit?
The Spuds
What venting material is most commonly used with a category 4 appliance?
PVC (polyvinyl chloride)
the aquastat is a boiler control made up of a
transformer, relay, and limit switch
What is the maximum recommended indoor CO levels
9 PPM
What is the maximum allowable level of undiluted carbon monoxide in the flue Gas of a gas burning appliance?
400 PPM
What systems rely on the buoyancy of the higher temperature flue Gas to ensure proper venting?
Natural draft
the flame sensor measures flame current in?
DC microamps
Carbon monoxide is most commonly produced in appliances by
incomplete combustion
What component ensures ignition across all the burners?
cross-lighter or carryover
Carbon Dioxide (CO2) can be hazardous or lethal at concentrations of...
40,000 PPM
the low voltage transformer sends a 24v signal to the thermostat which is connected to what terminal?
the R terminal
42 BTU
What is designed to maintain a constant pressure in a fuel line?
pressure regulator
throughout the sequence of operations, IFCs rely on feedback from...
input devices
in an intermittent ignition furnace, the flame sensor detects the what?
main burner flame