Field Controls GVD-4 Mode D'emploi page 44

The following steps are to be followed in making the modifications:
1. Perform a safety inspection of the existing appliance installation. See PRE-INSTALLATION INSPECTIONS section for the
recommended procedure for such a safety inspection.
2. Shut off all gas and electricity to the appliance. To shut off gas use the shutoff valve in the supply line to the appliance.
3. Install the automatic vent damper device in strict accordance with the manufacture's installation instructions. Make certain the
device is not located in that portion of the venting system which serves any appliance other than the one for which the damper
is installed.
4. Make certain wiring connections are tight and wires are positioned and secured so they will not be able to contact high
temperature locations.
5. When an additional automatic valve has been incorporated or an existing gas control replaced, conduct a gas leakage test of
the appliance piping and control system downstream of the shutoff valve in the supply line to the appliance.
6. Visually inspect the modified venting system for proper horizontal pitch.
7. Check that the damper and gas valve(s) are in the correct operating sequence.
a. The damper must be in the full open position before the gas valve(s) opens.
b. The damper must remain in the full open position while the gas valve(s) is open.
c. The gas valve(s) must be closed before the damper begins its return to the closed
d. The damper shall remain in the closed position during the off cycle of the appliance.
8. Determine the amperage draw of the gas control circuit and damper device.
a. Check the appliance transformer for adequate capacity.
b. Check heat anticipator in comfort thermostat to determine it is properly adjusted.
9. Do not install a damper device unless sufficient combustion and ventilation air is available. This can be determined by
demonstrating satisfactory operation of the appliance as described in steps 10 through 14. Sequence the appliance through at
least three normal operating cycles.
10. Insofar as it 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 except in a room where an exhaust fan is located. 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.
11. Place appliance in operation. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.
12. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation.
a. 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 around 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. 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.
14. 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.
15. 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.
16. 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.
17. Complete the device label:
a. Name of qualified agency responsible for damper installation.
b. Date of installation.
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position.