THE COMFORT PRODUCTS PEOPLE
INSTALLATION
(Continued)
Connecting Furnace to Gas Supply at Rear of Furnace
1.Remove the two screws in back of fur- nace cabinet located by the exhaust vent(s) (see Figures 9 and 10).
2.Remove two screws on front lower flange that attach furnace flange to fur- nace cabinet flange (see Figure 11). Note: 40,000 BTU/Hr model has a bot- tom shield (see parts list, page 22, for location). Removing two screws will detach bottom shield.
3.Slide furnace out of furnace cabinet.
4.Locate gas inlet pipe on lower, right front of furnace.
5.40,000 BTU/Hr Model Only: Remove screw holding gas inlet pipe clamp to furnace.
6.Disconnect gas inlet pipe from 3/8" manifold elbow. Turn gas inlet pipe counterclockwise to disconnect (see Figure 12).
7.Rotate the 3/8" manifold elbow 90° so the opening is pointing downward (see Figure 12).
8.Locate knockout plug in furnace cabi- net. Knockout plug is in lower left rear of furnace cabinet (as viewed from rear, see Figure 13). Remove knockout plug.
9.Slide furnace back into furnace cabi- net. 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 fur- nace flange and furnace cabinet lower flange together.
40,000 BTU/Hr Model: Place bottom shield back in place. Replace two screws removed in step 2. Attach bot- tom shield, furnace flange, and furnace cabinet lower flange together.
11.Run 3/8" pipe or nipple through knock- out hole. Connect 3/8" pipe or nipple to manifold elbow (see Figure 14). See Providing Gas Piping to Furnace, pages 9 and 10 for correct gas pipe in- stallation.
12.Check connections for gas leak.
WARNING: 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 leaks at once.
13.Caulk around pipe or nipple. This pre- vents cold air entering knockout hole.
Figure 9 - Locations of Screws in Back of Furnace Cabinet (25,000 BTU/Hr Model)
Figure 10 - Locations of Screws in Back of Furnace Cabinet (40,000 BTU/Hr Model)
Furnace
Furnace Flange
Cabinet
Flange
Figure 11 - Removing Screws on Lower Flange (40,000 BTU/Hr Model Shown)
Remove Screw,
40,000 BTU/Hr
Model Only
Gas Inlet
Pipe
Manifold Elbow
Figure 12 - Disconnecting Gas Inlet Pipe (40,000 BTU/Hr Model Shown)
Knockout Plug
Figure 13 - Location of Knockout Plug
3/8" NPT 
Figure 14 - Inserting Pipe through Knockout Hole
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