-5 pa, except -2pa for atmospherically vented water heater, -15 pa for pellet stove w/ draft fan aand sealed vent. -50 pa for direct vent appliance
Worst case CAZ setup
Close exterior doors, windows, fireplace flues. Zero out base pressure, turn on dryer, exhaust fans, air handler (if hurts), open/close interior doors if hurts CAZ.
Worst case CAZ test process
Test smallest Btu appliance first, test spillage (mirror, smoke), test CO at SSE. If spillage after 1 minute, test under natural conditions.
Combustion efficiency measurements
Combustion analyzer: CO less than 100ppm, O2 b/t 6-9%, flue gas temp and heat rise per manufacturer.
Gas combustion system inspection
Look for soot, melted wires, rust. Inspect burners, heat exchanger. Check high voltage, test pilot safety circuit. Check heat anticipator, venting, high limit control (220 F limit). Measure gas input, open window to see if it reduces CO.
Gas system maintenance if
CO >100 ppm, visual signs of soot or flame rollout, burners dirty, draft inadequate, no service in 2 years.
Measuring Btu/hr input on gas systems
turn off gas appliances, fire unit being tested, clock one turn of gas dial, consult table (x1000). adjust to within 10% of furnace label (3.2-4.0 IWC)
Oil burner inspection
Check barometric draft control (unless high static pressure or mobile home burner). Inspect for soot, overheating, fire hazards, corrosion, wiring, fuel lines, heat/combustion chamber, instantaneous flame ignition (except pre-purge units)