MAXIM

AXIAL FLOW GAS BURNER START-UP (continued)

17.Check flue gases with a flue analyzer to make final settings of the air shutter.

a.The readings need to be taken from a hole in the vent several inches above the heater vent connection, but before draft regulator.

b.Insert draft gauge into the 1/4" test opening in the stack. Draft in stack should read -.02" to -.06" W.C. Adjust draft regulator, if installed.

c.When water in the tank is above 120? F,

insert analyzer or O2 tester in 1/4" test opening and take O2 reading in percentage.

d.Gradually close air shutter, taking O2 reading at each adjustment of air shutter

until optimum O2 % (4-6%) is reached. If O2 % decreases, open air shutter to last reading where the greatest reading is achieved.

e.Insert CO tester in 1/4" test opening and take CO reading. CO should not exceed

.03%. A reading greater than .03% indicates lack of air. Open air shutter slightly and take readings until CO is within proper range. Optimum reading is no CO.

f.If air shutter was changed during CO test, take a final O2 reading.

g.Insert CO2 tester in 1/4" test opening; record in percentage.

h.Insert stack temperature gauge in 1/4" test opening and read gross stack temperature; maximum gross stack is to be 450°F, minimum net stack is to be 300°F. (NOTE: net temperature is the total stack temperature, less room temperature.) If an excessively high gross stack temperature is recorded, check the flue tubes for turbulators.

i.Make sure the air shutter is locked securely in place.

18.On burners with pilots, recheck pilot to make sure its operation has not deteriorated if adjustments are made to the air shutter. To do this, shut off the main valve, check the flame response signal by cycling the burner through several lightoffs.

19.Check each operating and limit control to be sure they function properly by lowering and raising the temperature setting on each control, causing the burner to cycle on and off.

NOTE: During the initial firing of the burner, smoke that is not related to the burner will be emitted from the heater. This is normal during "burn in" and could possibly continue for several hours.

20.Record the following information for future use:

A.Air shutter position________________

B.Manifold gas pressure________"W.C.

C.Stack draft_________________"W.C.

D.O2 reading_______________%(4-6%)

E.CO2 reading______________%(8-9%)

F.CO reading________%(less than .03%)

G.Stack temperature:

Gross _______________________°F. Less ambient__________________°F. Net__________________________°F.

H.Combustion efficiency___________%

PV500-17 05-2000

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Section 17