Carrier 48P2, P5030-100, P3, P4 installation instructions Gas Piping Details

*NPT plug is field supplied. NOTE: Follow all local codes.

Fig. 53 — Gas Piping Details

Step 18 — Install Flue/Inlet Hoods and Baffles — The flue/inlet hoods and baffles are shipped in a package taped to the basepan in the fan section. The flue (out- let) hoods are pre-assembled. The flue deflector, inlet hoods, and baffles require assembly.

The hoods are located on the heating section access panel as shown in Fig. 54 (sizes 030-050), Fig. 55 (sizes 055-100 with low heat and vertical supply), Fig. 56 (sizes 055-100 with low heat and horizontal supply), and Fig. 57 (sizes 055-100 with high heat). The inlet baffles are located inside the access panel as illustrated in Fig. 58 (sizes 030-050), Fig. 59 (sizes 055-100 with modulating low heat and horizontal supply), and Fig. 60 (sizes 055-100 with modulating high heat). See Table 26 for a list of parts used to assemble each hood and quantities of each hood type and baffle used with each unit.

1.Remove shipping block-offs and shipping tape from all openings in the access panel.

2.Attach flue outlet hoods (see Fig. 61) to access panel us- ing screws provided. Hoods are placed over each com- bustion outlet.

3.Install flue deflector baffle inside flue deflector hood. See Fig 62 for V-type deflector and Fig. 63 for curve-type deflector. For V-type deflector, screw the baffle and hood

14-IN.

INLET HOOD

FLUE HOOD AND

FLUE DEFLECTOR

HOOD (48 SERIES

HIGH-HEAT ONLY)

14-IN.

INLET HOOD

FLUE HOOD AND

DEFLECTOR

HOOD

14-IN.

INLET HOOD

Fig. 54 — Flue/Inlet Hood Locations, 030-050 Units

a48-8469

together with screw provided. Refer to Table 26 for usage.

4.Install flue deflector hood assembly over each flue outlet hood. See Fig. 64. Observe the offset mounting hole loca- tions in the deflector hood flanges when attaching hood to panel. Holes in the mounting flange must be at the bottom when attached.

5.Inlet hoods are shipped unassembled and must be assem- bled on the access panel (see Fig. 65-67). Flanges of the hood top and sides should be installed on the inside of the access panel openings with the screws provided. The sides should be placed on the inside of top hoods for all hood assemblies (6-in., 14-in., and 30-in.). Attach speed clips to screen. Insert screen into bottom opening of 6-in. and 14-in. hoods and secure it with 3 screws. To ease the installation, the 30-in. hood screen may be inserted from inside of access panel (gas section door) into bottom opening of hood. Secure with 5 screws. Attached view port cover over 14-in. inlet hood opening (Fig. 66). Se- cure with two screws.

6.Install inlet baffle on the access panel with the screw(s) provided. See Fig. 68 for 14-in baffle and Fig. 69 for 30-in baffle. Attach 14-in baffle from the outside of the access panel. The 30-in baffle should be installed from in- side of the access panel. Secure with three screws.

Step 19 — Install Supply-Air Thermistors (Staged and Modulating Gas Units Only) —

Supply-air thermistors are a field-installed, factory-provided component. Three supply-air thermistors are shipped with staged and modulating gas units inside the unit control box. Thermistor wires must be connected to the SGC in the unit control box. See Table 27. The supply-air thermistors should be located in the supply duct with the following criteria:

•downstream of the heat exchanger cells

•equally spaced as far as possible from the heat exchanger cells

•a duct location where none of the supply air thermistors are within sight of the heat exchanger cells

•a duct location with good mixed supply air portion of the unit.

FLUE OUTLET

HOOD

FLUE HOOD

AND FLUE DEFLECTOR

HOOD

VIEW PORT COVER

14-IN. INLET HOOD

6-IN. INLET HOOD

a48-8470

Fig. 55 — Flue/Inlet Hood Locations, Sizes 055-100,

Low Heat, Vertical Supply Units

62