Step 7 - Orifice Change; Vii. Step 7 — Orifice Change - Bryant DURAPAC 579F Installation, Start-Up And Service Instructions Manual

INDUCED DRAFT
MOTOR
MAIN BURNER
COMBUSTION
SECTION
FAN HOUSING
Fig. 10 — Combustion Fan Housing Location
3/4" FPT DRAIN
CONNECTION
Fig. 11 — Condensate Drain Details (579F180 Shown)
Fig. 12 — Condensate Drain Piping Details
HEAT EXCHANGER
SECTION
1-3/8"
DRAIN HOLE
— 9
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)
0-1,999
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
*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
579F180 Low Heat
579F210 Low Heat,
579F240 Low Heat,
579F300 Low Heat,
579F180 High Heat
579F210 High Heat,
579F240 High Heat,
579F300 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)
0-1,999
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
*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.
—
NATURAL GAS ORIFICE†
Low Heat High Heat
30 29
30 29
31 30
31 30
31 30
31 30
32 31
32 31
33 31
35 32
ORIFICE QUANTITY
5
6
7
LP GAS ORIFICE†
36
37
38
38
39
40
41
41
42
43