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recognized that generalized procedures cannot anticipate all situations. Accordingly, in some cases deviation from this
procedure may be necessary to determine safe operation of the equipment:
a. This procedure should be performed prior to any attempt to modification of the appliance or of the installation.
b. If it is determined there is a condition which could result in unsafe operation, the appliance should be shut off and
the owner advised of the unsafe condition.
T
F
S
S
HE
OLLOWING
TEPS
HOULD
1. Conduct a gas leakage test of the appliance piping and control system downstream of the shut off valve in the supply
line to the appliance.
2. Visually inspect the venting system for proper size and determine there is no blockage or restriction, leakage,
corrosion, and other deficiencies which could cause an unsafe condition.
3. Shut off all gas to the appliance and shut off any other fuel-gas burning appliance within the same room. Use the shut
off valve in the supply line to each appliance.
4. Inspect burners and crossovers for blockage and corrosion.
5. Applicable only to furnaces. Inspect heat exchanger for cracks, openings, or excessive corrosion.
6. Applicable only to boilers. Inspect for evidence of water or combustion product leaks.
7. Insofar as practical, close all building doors and windows and all doors between the space in which the appliance is
located and other spaces of the building. Turn on clothes dryers. Turn on any exhaust fans, such as range hoods and
bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace
dampers. If, after completing Steps 8 through 13, it is believed sufficient combustion air is not available, refer to local
codes, or in the absence of local codes, to the National Fuel Gas Code, A.N.S.I. Z223.1 No. 54 for guidance.
8. Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will
operate continuously.
9. Determine that the pilot(s) is burning properly and that main burner ignition is satisfactory by interrupting and
reestablishing the electrical supply to the appliance in any convenient manner. Test the pilot safety device to
determine it is operating properly by extinguishing the pilot burner(s) when the main burner(s) is off and determine,
after 3 minutes, that the main burner gas does not flow upon a call for heat.
a. Visually determine that main burner gas is burning properly: i.e., no floating, lifting, or flashback. Adjust the
primary air shutter(s) as required.
b. If appliance is equipped with high and low flame controlling or flame modulation, check for proper main burner
operation at low flame.
10. Test for spillage at draft hood relief opening after 5 minutes of main burner operation. Use a draft gauge, flame or a
match or candle, or smoke from a cigarette, cigar, or pipe.
11. Turn on all other fuel-gas burning appliances within the same room so they will operate at their full inputs. Follow
lighting instructions for each appliance.
12. Repeat Steps 10 through 12 on the appliance being inspected.
13. Return doors, windows, exhaust fans, fireplace dampers, and any other fuel-gas burning appliance to their previous
conditions of use.
14. Applicable only to furnaces. Check both the limit control and fan control for proper operation. Limit control operation
can be checked by blocking the circulation air inlet or temporarily disconnecting the electrical supply to the blower
motor and determine that the limit control acts to shut off the main burner gas.
15. Applicable only to boilers.
a. Determine that the water pumps are in operating condition.
b. Test low water cutoffs, automatic feed controls, pressure and temperature limit controls, and relief valves in
accordance with the manufacturer's recommendations to determine they are in operating condition.
B
F
I
M
E
OLLOWED
N
AKING
T
S
I
:
HE
AFETY
NSPECTION
Page 4
PN 46170300 Rev A 11/00
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