INSTALLING
FURNACE
(Continued)
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8. Locate knockout plug in furnace cabinet. Knockout plug is in lower left rear of
furnace cabinet (as viewed from rear, see Figure 13). Remove knockout plug.
J
Knockout Plug
J
Figure 13 - Location of Knockout Plug
9. Slide furnace back into furnace cabinet. Make sure exhaust tube gaskets are in
place. Make sure exhaust and intake vent tubes extend into vent caps on back of
cabinet. Replace two screws by exhaust vent(s) removed in step 1.
10.25,000 Btu/Hr Model: Replace two screws removed in step 2. Attach furnace
flange and furnace cabinet lower flange together.
40,000 BttdHr Model: Place bottom shield back in place. Replace two screws
removed in step 2. Attach bottom shield, furnace flange, and furnace cabinet
lower flange together.
11.Run 3/8" pipe or nipple through knockout hole. Connect 3/8" pipe or nipple to
manifold elbow (see Figure 14). See Providing Gas Piping to Furnace, pages 16
and 17 for correct gas pipe installation.
Figure 14 - Inserting Pipe through Knockout Hole
12.Cheek connections for gas leak.
AWARNING
Never use an open flame to check for a leak. Apply a mixture of
liquid soap and water to all joints. Bubbles forming show a leak.
Correct all leeks at once.
13. Caulk around pipe or nipple. This prevents cold air entering knockout hole.
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