Instruction 0024-9435
14
Fyrite Tech
Atmospheric Burner or
Gravity Vented Forced Air
Hot Water Tank
4.1.4 Sampling Point
Forced Air Furnace
– When testing atmospheric burner or gravity
vented, forced air heating equip ment 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
fl
ue 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
fi
re tube be low the diverter.
80% Ef
fi
ciency 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 immediately above the inducer fan.
90% Ef
fi
ciency 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.
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.
