VI. Trap Condensate Drain, VII. Install GAS Piping

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 field-supplied manual gas shutoff valve with a 1/8 in. NPT pressure tap for test gage connection at unit. Field gas piping must include sediment trap and union. See Fig. 13. Install sediment trap in riser leading to heating section. This drip leg functions as a trap for dirt and condensate. Install trap where condensate cannot freeze. Install this sediment trap by connecting a piping tee to riser leading to heating section, so that straight-through section of tee is vertical. Then, connect capped nipple into lower end of tee. Extend capped nipple below level of gas controls.

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 gas-supply piping for 0.5-in. wg maximum pressure drop. Do not use supply pipe smaller than unit gas connection.

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 low-voltage wires for highest voltage con- tained within conduit when low-voltage control wires are run in the same conduit as high-voltage wires.

INDOOR MOTOR ACCESS

FILTER

ACCESS

3/4" FPT DRAIN	1-3/8"
CONNECTION	DRAIN HOLE

Fig. 11 — Condensate Drain Details

(581A155 Shown)

Fig. 12 — Condensate Drain Piping Details

Fig. 13 — Field Gas Piping

—8—

581A specifications

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