Yukon Oil Furnace Owner's Manual download pdf (Page 22)

Basically, stack temperature and percentage of CO

are a measure

of stack losses for any fuel. Therefore, many of the basic principles

can be and should be applied to oil-fired furnaces as well as for

those burning solid fuels.

In preparation for these tests, the following should be checked. The

Draft Regulator installed should be:

• plumb and level

• in the same room as the unit

• on the side of a vertical, sloping or horizontal smoke pipe

• located close to the furnace

Drill two holes approximately 1/4 inch in diameter in the flue pipe

between the outlet from the furnace and the Draft Control.

Insert a stack thermometer in one of the holes and leave it there

continually during the test so that you can refer to it at any time.

(See Fig. 20.)

TEST PROCEDURE

Step 1. Set the thermostat high enough so that the unit will run for

at least 15 minutes, t

he 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. (See Fig. 20.)

Fig. 20

Step 3. Insert the sampling tube of the CO

tester in the hole that

you have drilled adjacent to the stack thermometer and find the

percentage of CO

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 deter-

mine efficiency. (See Fig. 21.) Be sure to subtract room tempera-

ture from stack thermometer reading and use this net stack tem-

perature for determining the efficiency.

Step 5. Insert end of smoke tester into same hole as was used to

test for CO

and perform the smoke test.

Step 5. 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, depend-

ing on local requirements or your own service standard. (See Fig.

21.)

Repeat steps 3, 4, and 5 as needed, adjusting the air shutter on the

burner and draft regulator until you obtain the highest possible effi-

ciency. It is desirable to have a high CO

reading and low stack

temperature with a minimum smoke reading.

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