Field Controls GVD-4 Mode D'emploi page 40

Safety Inspection
1. Conduct a gas leakage test of the appliance piping and control system downstream of the shutoff valve in the supply line to the
appliance.
2. Visually inspect the venting system for proper size, horizontal pitch and vent termination, and determine there is no blockage
or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
3. Determine that the chimney or vent is acceptable to the authority having jurisdiction.
4. Shut off all gas to the appliance and shut off any other fuel-gas burning appliance within the same room. Use the shutoff valve
in the supply line to each appliance.
5. Inspect burners and crossovers for blockage and corrosion.
6. Applicable only to furnaces – inspect heat exchanger for cracks, openings or excessive corrosion.
7. Applicable only to boilers – inspect for evidence of water or combustion product leaks.
8. Insofar as is 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, stove top barbecues and central vacuum cleaners. 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 9 through 14, 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, ANSI Z223.1 or
CAN/CGAB149 Installation Codes, for guidance.
9. Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate
continuously.
10. 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 determining, after 3 minutes, that the main burner gas does
not flow upon a call for heat.
11. 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 the appliance is equipped with high and low flame controlling or flame modulation, check for proper main burner
operation at low flame.
12. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Vent connected gas utilization
equipment shall be operated for several minutes and checked to see that the combustion products are going up the chimney,
or gas vent, properly by passing a lighted match, taper or candle round the edge of the relief opening of the draft hood. If the
chimney or gas vent is drawing properly, the match flame will be drawn into the draft hood. If not, the combustion products will
tend to extinguish the flame. If the combustion products are escaping from the relief opening of the draft hood, the equipment
should not be operated until proper adjustments or repairs are made to provide adequate draft through the chimney or gas
vent.
13. Turn on all other fuel-burning appliances within the same room so they will operate at their full inputs. Follow lighting
instructions for each appliance.
14. Repeat Steps 11 and 12 on the appliance being inspected.
15. Return doors, windows, exhaust fans, fireplace dampers and any other fuel-gas burning appliances to their previous
conditions of use.
16. Applicable only to furnaces – Check both the limit control and the fan control for proper operation. Limit control operation can
be checked by blocking the circulating air inlet or temporarily disconnecting the electrical supply to the blower motor and
determining that the limit control acts to shut off the main burner gas.
17. Applicable only to boilers –
a. Determine that the water pumps are in operating condition.
b. Test low water cutoffs, automatic feed controls, and relief valves in accordance with the manufacturer's recommendations
to determine they are in operating condition.
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