U.S. Boiler Company SERIES 3, Installation, Operating And Service Instructions

Page: 47 / 56

47
APPENDIX G – ChECkING DRAFT AND COMBUSTION
CHECK DRAFT (GAS BOILERS WITH DRAFT HOODS)
1.
Insofar as is practical, close all doors and
windows in the building.
2.
Turn on all appliances not connected to the
same venting system as the boiler being
checked.
3.
Turn on all exhaust fans (such as range
hoods and bathroom exhausts) to their
maximum speed. Do not turn on any
summer exhaust fans.
4.
Close all fireplace dampers.
5.
Operate the appliance being checked.
Follow lighting instructions.
CHECK COMBUSTION
1.
Use a flue gas analyzer that accurately
measures CO
2
, O
2
, CO, and flue gas
temperature.
2.
Operate the boiler at its rated (high fire)
input.
3.
With the analyzer, check the CO
2
(or O
2
),
CO and temperature of the flue gases
exiting the boiler.
4.
Confirm that the measured CO
2
(or O
2
)
matches the required CO
2
(or O
2
) specified
for the boiler.
.
If CO
2
, O
2
, or CO fall outside of the
range specified for the boiler, review the
installation and startup instructions and make any
necessary adjustments to the boiler or associated
venting or piping systems.
i
Note the gross flue gas temperature for
future reference. Significant changes in
flue gas temperature can indicate changes
in the boiler’s operating efficiency.
6.
After 5 minutes of main burner operation,
test for spillage at the draft hood relief
opening, using a lighted match, candle,
cigarette, etc.
7.
Repeat this test for each appliance
connected to the common venting system.
8.
If any appliance does not vent properly, per
the above test, make corrections, so that the
installation conforms to the
National Fuel
Gas Code
,
NFPA 54/ANSI Z223.1
, and/or
Installation Codes
,
CAN/CSA B149.1.
9.
Return doors, windows, exhaust fans,
fireplace dampers, and any other gas-
burning appliance to their previous condition
of use.