Carrier 48HC Install Flue Hood and Combustion Air Hood, Install Gas Piping, Gas Supply Line

To assemble the outside air hood:

1.Remove hood top panel from shipping position on unit end.

2.Install four angles to the upper end panel using the screws provided.

3.Apply seal strip to mating flanges on the side plates of the hood (see Fig. 14).

The combustion air hood is attached to the back of the burner access panel. Remove the two screws securing the hood to the back of the burner access panel. Using the two screws, re-attach the hood to the front of the burner access panel as shown in Fig. 16.

48HC

Apply Seal Strip to the front of this flange

Apply Seal Strips to the back of these flanges

2

Seal Strips 5 6

	Apply Seal Strips	3	Apply Seal Strip
	to the back of
	these surfaces		to the front of
			this flange
			7
	7
			2
		4	4
	4		5
4
			6
			Apply Seal Strip
			to the back of
	1		this flange
Item #	Description	Qty
1	Angles	4
2	Side Plates	2
3	Hood	1
4	Outdoor Air Screens	4
5	Side Filter Supports	2
6	Side Drip Angles	2
7	Top Diverters	2

Combustion	Flue Hood
Air Hood

C10744

Fig. 16 - Flue Hood and Combustion Air Hood Details

C09079

Fig. 14 - Hood Part Identification and Seal Strip

Application Areas

4.Secure side plates to panel using the screws provided.

5.Apply seal strip to mating flange of the hood (see Fig. 14).

6.Secure top flange using screws provided in kit.

7.Install outdoor air screens by sliding them into the channel formed by the four angles installed in step 2. Make sure that the screens extend across the entire length of the hood.

8.Install side filter supports using the screws provided.

9.Install side drip angles using the screws provided.

10.Run a continuous length of seal strip across the hood covering the engagement holes in the lower hood.

11.Install top diverter using the screws provided.

12.On units with barometric relief, remove screws at bot- tom of relief damper. Do not discard damper door.

C09090

Fig. 15 - Hood Assembly – Completed

Step 9 — Install Flue Hood and Combustion Air Hood

The flue hood is shipped screwed to the fan deck inside the burner compartment. Remove the burner access panel and then remove the flue hood from its shipping location. Using the screws provided, install flue hood in the location shown in Fig. 16.

Step 10 — Install Gas Piping

Installation of the gas piping must be in accordance with local building codes and with applicable national codes. In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC). In Canada, installation must be accordance with the CAN/CSA B149.1 and CAN/CSA B149.2 installation codes for gas burning appliances.

This unit is factory equipped for use with Natural Gas fuel at elevations up to 2000 ft (610 m) above sea level. Unit may be field converted for operation at elevations above 2000 ft (610 m) and/or for use with liquefied petroleum fuel. See accessory kit installation instructions regarding these accessories.

NOTE: Furnace gas input rate on rating plate is for installation up to 2000 ft (610 m) above sea level. In U.S.A. the input rating for altitudes above 2000 ft (610 m) must be derated by 4% for each 1000 ft (305 m) above sea level. In Canada the input rating must be derated by 10% for altitudes of 2000 ft (610 m) to 4500 ft (1372 m) above sea level.

For natural gas applications, gas pressure at unit gas connection must not be less than 5 in. wg (1246 Pa) or greater than 13 in. wg (3240 Pa) while the unit is operating. For liquified petroleum applications, the gas pressure must not be less than 11 in. wg (2740 Pa) or greater than 13 in. wg (3240 Pa) at the unit connection.

Gas Supply Line —

The gas supply pipe enters the unit adjacent to the burner access panel on the front side of the unit, through the grommeted hole. The gas connection to the unit is made to the 3/4 in. FPT gas inlet port on the unit gas valve.

Table 2 lists typical 3/4 inch NPT (National Pipe Thread) field supplied pipe fittings required for Thru-Base gas supply, starting from the unit gas valve (see Fig. 17).

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