Bacharach INSIGHT manual Sampling Point, Performing a Combustion Test

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.

4.4Sampling 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.

Fyrite® INSIGHT

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
O2	% Oxygen
CO	ppm Carbon Monoxide
Eff	% Combustion Efficiency
CO2	% 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

22 Instruction 24-9460 Instruction 24-9460 23