Maintenance
TEST PROCEDURE
Step 1.
Set the thermostat high enough so that the unit will run for at least 15 minutes, the maximum time that should be required for the test. Let the unit operate enough for the stack temperature to stabilize.
Step 2.
For your initial set of readings, set the Draft Regulator so that there is .03 Water Column Draft in the smoke pipe between the flue outlet and draft regulator.
A manometer must be used to properly set the draft to
.03” WC.
Step 3.
Insert the sampling tube of the CO2 tester in the hole that you have drilled adjacent to the stack thermometer and find the percentage of CO2 in the sample of the products of combustion. Follow the instructions of the manufacturer of the instrument you are using.
Step 4.
Use efficiency finder chart or stack loss slide rule to determine efficiency. Be sure to subtract room temperature from stack thermometer reading and use this net stack temperature for determining the efficiency.
Step 5.
Insert end of smoke tester into same hole as was used to test for CO2 and perform the smoke test.
Step 6.
The filter paper from the smoke test, when compared to the standard, must be determined and be found to be satisfactory. It should never be greater than #2, preferably #1 or zero, depending on local requirements or your own service standard.
Repeat steps 3, 4, and 5 as needed, adjusting the air |
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shutter on the burner and draft regulator until you |
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obtain the highest possible efficiency. It is desirable to |
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have a high CO2 reading and low stack temperature |
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with a minimum smoke reading. | FIG. 41 |
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