Field Controls GVD-4 Manuel D'instructions page 7

INSTALLATION ON EXISTING APPLIANCES
This procedure is intended as a guide to aid in safely installing an electrically operated automatic vent
damper device on an existing appliance so that the modifi ed appliance will continue to operate safely and
satisfactorily. This procedure is based on the assumption that the history of the specifi c appliance has been
one of safe and satisfactory operation.
This procedure is predicated on central furnace, boiler, and water heater installations, and it should be
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.
The following steps are to be followed in making the modifi cations:
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 manufacturer'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 modifi ed 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 position.
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 suffi cient 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 fi replace 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 fl ame will be drawn into the draft hood. If not, the combustion products will
tend to extinguish the fl ame. 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 fl oating, lifting, or fl ashback. Adjust
the primary air shutter(s) as required.
b. If the appliance is equipped with high and low fl ame controlling or fl ame modulation, check for proper
main burner operation at low fl ame.
page 7 of 20
P/N 46352700 Rev J 05/19