Install Instructions

52
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 replace dampers.
5. Operate the appliance being checked.
Follow lighting instructions.
CHECK COMBUSTION
1. Use a ue gas analyzer that accurately
measures CO
2
, O
2
, CO, and ue gas
temperature.
2. Operate the boiler at its rated (high re)
input.
3. With the analyzer, check the CO
2
(or O
2
),
CO and temperature of the ue gases
exiting the boiler.
4. Conrm that the measured CO
2
(or O
2
)
matches the required CO
2
(or O
2
) specied
for the boiler.
.
If CO
2
, O
2
, or CO fall outside of the
range specied 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, ANSI Z223.1/NFPA 54, and/or
Natural Gas and Propane Installation Code,
CAN/CSA B149.1.
9. Return doors, windows, exhaust fans,
replace dampers, and any other gas-
burning appliance to their previous condition
of use.