Williams 0743511, 0743512 Wall Installation, The furnace must be located on an outside wall

Installation

Installation should be done by a QUALIFIED SERVICE TECHNICIAN.

The furnace must be located on an outside wall.

Wall Installation

Minimum clearances from combustible materrials:

•Unit to the top surface of carpeting, tile: 2-inches (50 mm)

•Unit to back wall (0” to spacers):

1/4-inch (6.3 mm).

•Vent to wall enclosure: 1-inch (25.4 mm)

•Unit to sidewalls:

2-inches (50 mm)

•Unit to ceiling:

10-inches (254 mm)

See Figure 1 showing clearance for installation of vent cap.

Leave at least three feet in front of the wall furnace for servicing and proper operation. The wall furnace must be installed in such a way that the external casing can be completely removed for servicing.

If there is a shelf above the furnace, it must be be noncombustible. A minimum clearance of 4-inches (100 mm) is recommended between the furnace and the noncombustible shelf above it.

WARNING: For the installation of this furnace, the following items must be used as a vent air intake system:

External Plate

(Part Number: WFL–STF088)

External Vent Cap

(Part Number: WFR–12426530)

Flanged Air Inlet Tube

(Part Number: WFR–12476500)

Air Tube Gasket

(Part Number: WFC–12900128)

Flue Outlet Tube

(Part Number: WFR–12476510)

(All the above items are supplied with the furnace) The diameter of the hole in the wall must exceed at least 2-inches (50 mm) the diameter of the air inlet tube.

Gas equipment in residential garages must be installed so that all burners and burner ignition devices are located not less than 18-inches (460 mm) above the floor. Such equipment shall be located, or protected, so it is not subject to physical damage by a moving vehicle.

The vent terminal of this direct-vent furnace must be located at least 9-inches (230 mm) from any opening through which flue gases could enter a building. The bottom of the vent terminal and the air intake must be located at least 12-inches (300mm) above grade.

DO NOT cover the furnace.

Make sure that the correct gas supply is available. Conversion To another gas type must be performed by a qualified service technican. If the type of gas does not correspond to the type to be used (natural or LP Gas), it must be converted to the correct type of gas. It is necessary to do the following two operations:

WARNING: The nearest point of the vent cap should be a minimum horizontal distant of six (6) feet (1,830

mm)from any pressure regulator. In case of regulator malfunction, the six (6) feet (1,830 mm) distance will reduce the chance of gas entering the vent cap.

1.Remove and change the pilot orifice with the correct gas type as shown below.

2.Remove and change the burner orifice with the correct gas type as shown below.

3.Remove and change the gas valve with the correct gas type as shown below.

Gas Type	Orifice Part Numbers	Gas Valve
Natural	Burner Orifice: JGLL051; Pilot Orifice: JGLL064	JVLV023
Propane (LP Gas)	Burner Orifice: JGLL070; Pilot Orifice: J12160880	JVLV024

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