Removal of the Furnace from Common Vent

In the event that an existing furnace is removed from a venting system commonly run with separate gas appliances, the venting system is likely to be too large to properly vent the remaining attached appliances.

Conduct the following test while each appliance is operating and the other appliances (which are not operating) remain connected to the common venting system. If the venting system has been installed improperly, you must correct the system as indicated in the general venting requirements section.

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death.

The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation.

1.Seal any unused openings in the common venting system.

2.Inspect the venting system for proper size and horizontal pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

3.Close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn ON clothes dryers and any appliances not connected to the common venting system. 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.

4.Follow the lighting instructions. Turn ON the appliance that is being inspected. Adjust the thermostat so that the appliance operates continuously.

5.After the main burner has operated for 5 minutes, test for leaks of flue gases at the draft hood relief opening. Use the flame of a match or candle.

6.After determining that each appliance connected to the common venting system is venting properly, (step 3) return all doors, windows, exhaust fans, fireplace dampers, and any other gas burning appliances to their previous mode of operation.

7.If a venting problem is found during any of the preceding tests, the common venting system must be modified to correct the problems.

Resize the common venting system to the minimum vent pipe size determined by using the appropriate tables in Appendix G. These are in the current standards of the National Fuel Gas Code ANSI Z223.1.

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Issue 1109

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Allied Air Enterprises A93DF, A95DF, 92G1DF Removal of the Furnace from Common Vent, Carbon Monoxide Poisoning Hazard
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A95DF, 95G1DF, A93DF, 92G1DF specifications

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The 92G1DF model features a multi-stage gas valve that enhances temperature regulation, allowing for more precise heating. With an impressive Annual Fuel Utilization Efficiency (AFUE) rating, this furnace efficiently utilizes fuel, resulting in lower energy costs and reduced emissions. Its compact design makes it suitable for installations in tight spaces, while the durable heat exchanger extends the unit’s lifespan.

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