Carrier 48AJ - Manual (Page 28)

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Step 5 — Install Flue Hood
48AJ,AK,AW,AY020-050 AND 48EJ,EK,EW,EY024-048
UNITS — Flue hood is shipped inside gas section of unit. To
install, secure flue hood to access panel. See Fig. 20A.
48AJ,AK,AW,AY060 AND 48EJ,EK,EW,EY054-068
UNITS — Flue hood and wind baffle are shipped inside gas
section of unit. To install, secure flue hood to access panel. In-
stall the two pieces of the wind baffle over the flue hood. See
Fig. 20B.
NOTE: When properly installed, flue hood will line up with
combustion fan housing. See Fig. 21.
Step 6 — Trap Condensate Drain — See Fig. 5-16
for drain location. Condensate drain is open to atmosphere and
must be trapped. Install a trapped drain at the drain location.
One 1-in. FPT coupling is provided inside the unit evaporator
section for condensate drain connection. A trap at least 4-in.
deep must be used. See Fig. 22. Trap must be installed to pre-
vent freeze-up.
Condensate pans are sloped so that water will completely
drain from the condensate pan to comply with indoor air quali-
ty guidelines. The condensate drain pans are not insulated.
Step 7 — Install Gas Piping — Unit is equipped for
use with natural gas. Installation must conform with local
building codes or, in the absence of local codes, with the Na-
tional Fuel Gas Code, ANSI Z223.1.
Install manual gas shutoff valve with a 1 /
8
-in. NPT pressure
tap for test gage connection at unit. Field gas piping must in-
clude sediment trap and union. See Fig. 23. An 1 /
8
-in. NPT is
also located on the gas manifold adjacent to the gas valve.
Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing.
FLUE HOOD
GAS SECTION
ACCESS PANEL
WIND
BAFFLE
TOP VIEW SIDE VIEW
Fig. 20A — Flue Hood Location
(48AJ,AK,AW,AY020-050 and
48EJ,EK,EW,EY024-048 Units)
Fig. 20B — Flue Hood Location
(48AJ,AK,AW,AY060 and
48EJ,EK,EW,EY054-068 Units)
Fig. 21 — Combustion Fan Housing Location
Fig. 22 — Condensate Drain Trap Piping Details
(Typical Roof Curb or Slab Mount Shown)