Carbon Monoxide Poisoning Hazard | Lennox International Inc G24-200

Testing for Proper Venting and Sufficient Combustion Air (Non−Direct Vent Applications Only)

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 monox- ide poisoning or death.

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

After the furnace has been started, the following test should be conducted to ensure proper venting and suffi- cient combustion air has been provided to the furnace, as well as to other gas-fired appliances which are separately vented. The test should be conducted while all appliances (both in operation and those not in operation) are con- nected to the venting system being tested.

1 − Seal any unused openings in the venting system.

2 − Visually inspect the venting system for proper size and horizontal pitch. Determine there is no blockage or re- striction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

3 − To the extent that it is practical, close all building doors and windows and all doors between the space in which the appliances connected to the venting system are lo- cated and other spaces of the building.

4 − Close fireplace dampers.

5 − Turn on clothes dryers and any appliances not con- nected to the 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.

6 − Follow the lighting instruction to place the appliance being inspected into operation. Adjust thermostat so appliance will operate continuously.

7 − Test for spillage of flue gases at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of match or candle, or smoke from a ciga- rette, cigar.

8 − If improper venting is observed during any of the above tests, the venting system must be corrected or sufficient combustion/make-up air must be provided. The venting system should be re-sized to approach the minimum size as determined by using the ap- propriate tables in appendix G in the current stan- dards of the National Fuel Gas Code ANSI−Z223.1/NPFA 54 in the U.S.A., and the ap- propriate Natural Gas and Propane appliances vent- ing sizing tables in the current standard of the CSA−B149.1 Natural Gas and Propane Installation Code in Canada.

9 − After determining that each appliance remaining connected to the common venting system properly vents when tested as indicated in step 3, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliance to their pre- vious condition of use.

General Guidelines for Vent Terminations for Non-Direct Vent Installations.

In Non-Direct Vent applications, combustion air is taken from indoors and the flue gases are discharged to the out- doors. The furnace is then classified as a non-direct vent, Category IV gas furnace. In Non-Direct Vent applications, the vent termination is limited by local building codes. In the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223−1/NFPA 54 in U.S.A., and cur- rent standards CSA−B149.1 of the Natural Gas and Pro- pane Installation Codes in Canada for details.

Position termination end according to location given in fig- ure 11. In addition, position termination end so it is free from any obstructions and above the level of snow accu- mulation (where applicable). The termination should be at least 12 inches (305mm) from any opening through which flue products could enter the building.

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