A.O. Smith 315795-000 MH, FMD 40, FMD 50, FMD 30 instruction manual Roof Jack Installation

Models: FMD 40 FMD 50 315795-000 MH FMD 30

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ROOF JACK INSTALLATION

ROOF JACK KIT MODELS VENT KIT- 12 INCH (30.48 cm) 9002964005, VENT KIT - 32 INCH (81.28 cm) 9002965005,

VENT KIT - 60 INCH (152.40 cm) 9002966005 AND VENT KIT - 95 INCH (241.30 cm) 9002967005

FIGURE 13.

1.Cut 5 1/2” (13.97 cm) diameter holes through the roof and ceiling directly in line with the flue connection on top of the water heater. For a sloped roof, the roof hole may have to be enlarged to allow the roof jack to be installed vertically.

2.Telescope down the flue pipe in the roof jack assembly to a length that will project at least 6 inches (15 cm) below the finished ceiling before installing the roof jack assembly.

NOTE: Flue pipe joints have silicone seals that must remain in place. A soapy water solution sprayed around the seal area will enable the flue pipe and outer pipe below to telescope more freely.

3.Telescope down the outer pipe of the roof jack assembly to a length that will project at least 2” (5.08 cm) below the finished ceiling before installing the roof jack assembly, see Figure 14.

FIGURE 14.

4.Ease the roof jack assembly through the roof and ceiling openings. The roof jack flashing tilts up to 22.6° degrees for use on a sloping roof.

5.Use sealant or caulk on the roof to seal under flashing of the roof jack assembly. Use roof nails or screws on wood construction or sheet metal screws on metal roofs (nails and screws not provided), see Figure 15.

FIGURE 15.

NOTE: An optional Roof jack Extension Pipe (9002588) is required when the roof pitch is 5 1/2” (13.97 cm) or greater, or where local codes require the roof jack cap (outlet) terminate above the peak of the roof.

6.Remove the paper backing from the 1 1/2” x 9 3/4” (3.81 cm x 24.77 cm) woven tape seal (found attached to the heater top) and apply the seal around the flue collar of the water heater, see Figure 16 on page 12.

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A.O. Smith 315795-000 MH, FMD 40, FMD 50, FMD 30 instruction manual Roof Jack Installation