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Instruction 24-9460
22
Fyrite
®
INSIGHT
Instruction 24-9460
23
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 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 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 be low 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 Com bus tion 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.
1. Press the RUN/HOLD button to start the test. You should hear the
pump start running and see the word RUN appear at the top of the
Combustion Test screen.
Sensor Indicators: The following indicators appear in the sensor's data
field depending on certain conditions:
(
∗ ∗ ∗) Sensor that is not calibrated or installed.
(XXX) Sensor overrange
(
- - -
) The calculated data cannot be displayed because the measured
data necessary to make the calculation is out of range (i.e., oxygen level
above 16%).
2. Use the up and down arrow keys to scroll to the T-STK reading.
Loosen the thumbscrew on probe stop and move probe in and out of
the stack until the stack’s core temperature (hot spot) is located as
indicated by the highest T-STK reading; then tighten thumbscrew to
prevent further probe movement. Locating the highest stack tempera-
ture is very important for accurate efficiency calculations.
3. You can now begin burner-service procedures. The analyzer readings
will change quickly to show changes in burner performance.
CAUTION: Position the Water Trap with its gas-flow
arrow pointing upward. Do not let water condensate go above
the tip of the riser tube. The sensors could be damaged if water
would enter the analyzer. Empty the Water Trap after every
combustion test (refer to Section 4.10)
4. Pressing the RUN/HOLD button freezes all readings, stops the pump and
displays the Combustion-Test HOLD screen. Use the ▲▼ buttons to view
all test values at the moment the RUN/HOLD button was pressed. Press-
ing RUN/HOLD again restarts the pump and resumes testing.
Display Name Description of Measurement or Calculation
O
2
% Oxygen
CO ppm Carbon Monoxide
Eff % Combustion Effi ciency
CO
2
% Carbon Dioxide
T-STK Stack Temperature
T-AIR Primary/Ambient Air Temperature
EA % Excess Air
CO(O) Carbon Monoxide ppm level referenced to a % of oxygen