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Manual 2100-422
Page 16
4. FINAL CHECKS
M. Measure Stack Temperature Operating the
unit at an excessive firing rate will generate
more heat than the heat exchanger can utilize
and result in unnecessary heat loss up the
chimney. Other causes of excessive heat loss
are badlysooted heat exchanger surfaces and
excessive draft. The temperature of the flue gas
provides an indication of these heat losses.
Measure flue temperature by subtracting the
room air temperature from the thermometer
reading. Excessive stack loss is indicated of the
net stack temperature during steady operation
exceeds 600° F.
N. Check Ignition Check operation over repeated
cycles to insure prompt ignition on starting.
O. Check Pump Cutoff Slow pump cutoff at the
end of a firing cycle can cause smoke and other
pollutant emissions. Check for prompt pump
cutoff by observing flame or by testing smoke at
shutdown. If poor cutoff is observed, make sure
air is purged from the pump and nozzle line.
Air trapped in the pump or nozzle line will
expand when heated, thus causing oil to drip
into the combustion chamber after shutdown. If
poor cutoff persists, repair or replace pump.
Also make sure the pump solenoid is working.
If not replace.
SHORT FORM ADJUSTMENT
PROCEDURE
Some burner service organizations may wish to
perform a shorter procedure for the adjustment of oil
burners. The following is an example of such a short
form prepared by the National Association of Oil Heat
Service Managers.
1. SERVICE AND CLEAN BURNER
Follow company procedure to complete the
cleaning and servicing. Operate burner for ten
minutes while tools are gathered and are cleaned.
2, CHECK DRAFT
Set draft regulator, if necessary. Regulator should
be adjusted to achieve a -.02” W.C. over fire
condition. The more restricted and lengthy the
flue, the higher the draft necessary to obtain the
accepted over fire conditions.
3. SMOKE TEST
Follow the instructions of the manufacturer of the
smoke tester and take a smoke sample. Adjust the
air to obtain a preliminary reading of about No. 3
spot. Then readjust the air to obtain the lowest
possible reading, but do not open the air
adjustment more than absolutely necessary to
obtain a trace or No. 0 spot.
4. CO
2
TEST
Check CO
2
levels. This level should be between
10% and 12%.
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