INDUCED DRAFT
MOTOR
COMBUSTION | MAIN BURNER | HEAT EXCHANGER |
FAN HOUSING | SECTION | SECTION |
Fig. 10 — Combustion Fan Housing Location
VI. STEP 6 — TRAP CONDENSATE DRAIN
See Fig. 4, 5, and 11 fore drain location. Plug is provided in drain hole and must be removed when unit is operating. One 3/4 in. half coupling is provided inside unit evaporator section for condensate drain connection. An 81/2 in. x 3/4 in. diameter nipple and a 2 in. x 3/4 in. diameter pipe nipple are coupled to standard 3/4 in. diameter elbow to provide a straight path down through holes in unit base rails (see Fig. 11 and 12). A trap at least 4 inches deep must be used.
VII. STEP 7 — INSTALL GAS PIPING
The gas supply pipe enters the unit through the 11/2 in. diameter knockout provided. The gas connection to the unit is made to the 3/4 in. FPT gas inlet on the gas manifold. 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
WARNING: Do not pressure test gas supply while connected to unit. Always disconnect union before servicing.
IMPORTANT: Natural gas pressure at unit gas connection must not be less than 5.5 in. wg or greater than 13.5 in. wg.
Size
VIII. STEP 8 — MAKE ELECTRICAL CONNECTIONS
A. Field Power Supply
Unit is factory wired for voltage shown on unit nameplate.
When installing units, provide a disconnect per NEC (National Electrical Code) requirements of adequate size (Table 2).
All field wiring must comply with NEC and local require- ments. Insulate
INDOOR MOTOR ACCESS
FILTER
ACCESS
3/4" FPT DRAIN | |
CONNECTION | DRAIN HOLE |
Fig. 11 — Condensate Drain Details
(581A155 Shown)