Lennox International Inc 15GCSX Vent Hood Installation, Existing Common Vent Systems

freeze on the walls or on overhangs (under eaves). The vent outlet should not discharge flue products on a sidewalk, patio or other walkway where the condensate could cause the surface to become slippery.

Do not install the unit so that the products of combustion will be allowed to accumulate within a confined space and recirculate.

Minimum Clearances to Combustible Materials

Above and Below Vent Hood

Minimum Clearance Above

Distance from

of Hood to of Unit

Minimum Clearance Below

Distance from Bottom of

of Unit

Figure 3

Vent Hood Installation

The vent hood, screen and screws are shipped inside the unit in the plastic bag which contains the installation instructions.

1 − Insert the vent screen into the vent tube Once inserted, the screen should be flush with the end of the tube as shown in figure 4.

Vent Hood Installation

Front	Top
		Vent
Screen
	Screen	NOTE −
		Screws
Vent		should pass
Screen is pre−formed	Vent Hood	through
		sides of
		screen to
		hold screen
		in place.
	Slotted side of
	vent hood faces
	condenser coil.

Figure 4

2 − Position the vent hood over the vent tube so that the slotted side of the hood faces the condenser coil. Use the four sheet metal screws (provided) to secure the vent hood to the vent tube. The screws should pass through the sides of the screen in order to hold the screen in place.

The vent hood must be installed prior to unit start−up.

Existing Common Vent Systems

If this packaged outdoor unit is replacing an existing indoor furnace that is being removed from a venting system commonly run with a water heater or other gas appliance, the venting system is likely to be too large to properly vent the remaining attached appliance(s).

Conduct the following test while the water heater is operating and the other gas appliances (which are not operating) remain connected to the common venting system.

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 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, or smoke from a cigarette, cigar, or pipe.

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 problem.

If necessary, you must 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/NFPA 54 in the USA, and the

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