Williams 2503532, 4003532 installation manual Connecting Furnace to Gas Supply at Rear of Furnace

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THE COMFORT PRODUCTS PEOPLE

DIRECT-VENT NATURAL GAS HEATER

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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Contents For Your Safety What to do if YOU Smell GAS OWNER’S Operation and Installation ManualFor Your Safety Safety Information Product Features SpecificationsLocal Codes UnpackingInstallation Installation ItemsCheck GAS Type Locating FurnaceInstalling Thermostat Installing in Normal Frame WallInstalling in Masonry Wall Creating Wall Opening and Mounting FurnaceLocating Thermostat on Wall Routing Thermostat CableMounting the Thermostat to Wall Connecting to GAS SupplyConnecting Furnace to Gas Supply at Front of Furnace Connecting Furnace to Gas Supply at Rear of Furnace Removing Screws on Lower Flange 40,000 BTU/Hr Model ShownProviding Gas Piping to Furnace ExamplePressure Testing Gas Supply Piping System Checking GAS ConnectionsPressure Testing Furnace Gas Connections Performance CheckOperating Instructions For Your Safety Read Before LightingOperating Furnace Inspecting Burner Flame Normal Operating SequenceTo Turn OFF GAS To Furnace Thermostat Control OperationCleaning and Maintenance Troubleshooting Observed Problem Possible Cause RemedyIgnition Failures Observed Problem Possible Cause Wire and wire connections at probe Wiring Diagrams Replacement Service HintsTechnical Service PartsIllustrated Parts List Cabinet Assembly 25,000 BTU/HR ModelCabinet Assembly 40,000 BTU/HR Model Combustion Chamber Assembly 25,000 BTU/HR Model Combustion Chamber Assembly 40,000 BTU/HR Model Burner Assembly 25,000 BTU/HR Model Burner Assembly 40,000 BTU/HR Model Blower Assembly 25,000 BTU/HR Model Blower Assembly 40,000 BTU/HR Model Warranty Information Limited Warranty Williams GAS Wall Furnace

2503532, 4003532 specifications

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