Specifications

Instruction 0024-9460

Fyrite

INSIGHT

4. Press ENTER to save the selection and re-

turn to the Combustion Test HOLD screen

or ESC to revert to the previous setting and

return to the MAIN MENU.

4.4 Sampling Point

Forced Air Furnace – When testing atmospheric burner or gravity

vented, forced air heating equipment with a clamshell or sectional heat

exchanger design, test each of the exhaust ports at the top of the heat ex-

changer. The probe should be inserted back into each of the exhaust ports

to obtain a flue gas sample, before any dilution air is mixed in.

Hot Water Tank – Domestic hot water tanks with the ‘bell’ shaped draft

diverter on top can be accurately tested by inserting the probe tip directly

into the top of the fire tube below the diverter.

80% Efficiency Fan Assist or Power Vented – Combustion testing of

fan assist or power vented, furnaces/boilers should be done through a hole

drilled in the vent approximately 12 inches above the inducer fan.

90% Efficiency Condensing – Condensing furnaces/boilers can be tested

through a hole drilled in the plastic vent pipe (when allowed by the manufac-

turer or local authority of jurisdiction) or taken from the exhaust termination.

After testing, the hole should be sealed with high temperature silicon.

Atmospheric or Gravity Vented Boiler – Boilers, which have a ‘bell’

shaped draft diverter directly on top, should be tested directly below the

diverter through a hole drilled in the vent connector.

NOTE: All drill holes should be sealed upon completion of combus-

tion testing.

4.5 Performing a Combustion Test

Ensure that the following has been completed, and then proceed with the

combustion test as described below:

•PowerONanalyzerandallowittowarmup(Section4.2).

•Selectfuelbeingburned(Section4.3).

•Insetprobeintopropersamplelocation(Section 4.4).

•Ifnecessary,insertoptionalprimaryairthermocoupleintocombustion

air-stream of burners that use an outside source of combustion air.