Bryant 580F operation manual VII. Orifice Change

INDUCED DRAFT

MOTOR

COMBUSTION	MAIN BURNER	HEAT EXCHANGER
FAN HOUSING	SECTION	SECTION

Fig. 11 — Combustion Fan Housing Location

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

Fig. 12 — Condensate Drain Details (580F180 Shown)

Fig. 13 — Condensate Drain Piping Details

VII. STEP 7 — ORIFICE CHANGE

This unit is factory assembled for heating operation using natural gas at an elevation from sea level to 2000 ft. This unit uses orifice type LH32RFnnn, where “nnn” indicates the orifice size based on drill size diameter in thousands of an inch.

A. High Elevation (Above 2000 ft)

Use accessory high altitude kit when installing this unit at an elevation of 2000 to 7000 ft. For elevations above 7000 ft, refer to Table 2 to identify the correct orifice size for the elevation. See Table 3 for the number of orifices required for each unit size. Purchase these orifices from your local Bryant dealer. Follow instructions in accessory Installation Instruc- tions to install the correct orifices.

Table 2 — Altitude Compensation*

ELEVATION (ft)	NATURAL GAS ORIFICE†
	Low Heat	High Heat
0-1,999	30	29
2,000	30	29
3,000	31	30
4,000	31	30
5,000	31	30
6,000	31	30
7,000	32	31
8,000	32	31
9,000	33	31
10,000	35	32

*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher alti- tudes. Includes a 4% input reduction per each 1000 ft.

†Orifices available through your Bryant dealer.

Table 3 — Orifice Quantity

UNIT	ORIFICE QUANTITY
580F180 Low Heat	5
580F210 Low Heat,
580F240 Low Heat,	6
580F300 Low Heat,
580F180 High Heat
580F210 High Heat,
580F240 High Heat,	7
580F300 High Heat

B. Conversion To LP (Liquid Propane) Gas

Use accessory LP gas conversion kit when converting this unit for use with LP fuel usage for elevations up to 7000 ft. For elevations above 7000 ft, refer to Table 4 to identify the correct orifice size for the elevation. See Table 3 for the number of orifices required for each unit size. Purchase these orifices from your local Bryant dealer. Follow instructions in accessory Installation Instructions to install the correct orifices.

Table 4 — LP Gas Conversion*

ELEVATION (ft)	LP GAS ORIFICE†
0-1,999	36
2,000	37
3,000	38
4,000	38
5,000	39
6,000	40
7,000	41
8,000	41
9,000	42
10,000	43

*As the height above sea level increases, there is less oxygen per cubic foot of air. Therefore, heat input rate should be reduced at higher altitudes. Includes a 4% input reduction per each 1000 ft.

†Orifices available through your Bryant dealer.

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