23
Fig. 18 —
Flue Hood Location
(48A020-050 Units)
Fig. 19 —
Flue Hood Location
(48A2,A3,A4,A5060 Units)
Fig. 20 —
Combustion Fan Housing Location
(48A020-050 Shown)
Step 6 — Trap Condensate Drain
See Fig. 5-12 for drain location. Condensate drain is open to atmo
-
sphere and must be trapped. Install a trapped drain at the drain
location. One 1-in. female coupling is provided inside the unit
evaporator section for condensate drain connection. A trap at least
4 in. deep must be used. See Fig. 21. 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 quality guide
-
lines. The condensate drain pans are not insulated.
Fig. 21 —
Condensate Drain Trap Piping Details
(Typical Roof Curb or Slab Mount Shown)
Step 7 — Install Gas Piping
Unit is equipped for use with natural gas. Installation must con
-
form with local building codes or, in the absence of local codes,
with the National 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 include sedi
-
ment trap and union. See Fig. 22. A
1
/
8
-in. NPT is also located on
the gas manifold adjacent to the gas valve.
Size gas-supply piping for 0.5-in. wg maximum pressure drop. Do
not use supply pipe smaller than unit gas connection.
Fig. 22 —
Field Gas Piping
a48-3712
a48-4076
FLUE HOOD
GAS SECTION
ACCESS PANEL
WIND
BAFFLE
TOP VIEW
SIDE VIEW
a48-3823
WARNING
Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing. Personal injury or
damage to unit may occur.
IMPORTANT: Natural gas pressure at unit gas connection
must not be less than 5 in. wg or greater than 13.5 in. wg.
a48-3714
a48-2524
