Williams 4003532 - Manual (Page 8)

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DIRECT-VENT NATURAL GAS HEATER
THE COMFORT PRODUCTS PEOPLE
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.
Figure 14 - Inserting Pipe through
Knockout Hole
Figure 13 - Location of Knockout Plug
Knockout Plug
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.
INSTALLATION
(Continued)
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)
Figure 11 - Removing Screws on Lower
Flange (40,000 BTU/Hr Model Shown)
Figure 12 - Disconnecting Gas Inlet Pipe
(40,000 BTU/Hr Model Shown)
Remove Screw,
40,000 BTU/Hr
Model Only
Gas Inlet
Pipe
Manifold Elbow
Furnace
Flange
Furnace
Cabinet
Flange
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.
13. Caulk around pipe or nipple. This pre-
vents cold air entering knockout hole.
3/8" NPT