Bard W24G2DA, Installation Instructions Manual

Page: 31 / 69

Manual 2100-592C
Page
31 of 69
TABLE 8
Natural Gas Orifice Tables for Models W24G, W30G and W36G
All other orifice sizes shown are available as individual items. See Orifice tables below for part numbers and number required.
Factory Standard
Input
Gas Heat* Value
BTU/Cu. Ft.
Up to 6,000' No
Changes Except
for BTU Content
6,001' to 8,000'
Requires Pressure Switch
Change and Orifice
Change Based on BTU
Content
8,001' to 10,000'
Requires Pressure Switch
Change and Orifice Change
Based on BTU Content
22500 BTU
Per Burner
700-749 2.75 2.70 2.60
750-799 2.70 2.60 2.50
800-849 2.60 2.50 2.45
850-899 2.50 2.45 2.35
900-949 2.45 2.35 (2.30)
950-999 2.35
(2.30)
2.25
1000-1049** (2.30) 2.25 [2.20]
1050-1100 2.25 [2.20] 2.15
Pressure Switch Standard (.55) Order 8620-189 High Altitude Pressure Switch Kit (.42)
(2.30) is the standard factory-installed orifice size
[2.20] orifices are shipped with the unit for field-installed
optional 10% derate
Optional
10% Field
Converted Derate
Gas Heat* Value
BTU/Cu. Ft.
Up to 6,000 Feet No
Changes Except
for BTU Content
6,001' to 8,000'
Requires Pressure Switch
Change and Orifice
Change Based on BTU
Content
8,001' to 10,000'
Requires Pressure Switch
Change and Orifice Change
Based on BTU Content
20250 BTU
Per Burner
700-749 2.60 2.50 2.45
750-799 2.50 2.45 2.40
800-849 2.45 2.40 (2.30)
850-899 2.40 (2.30) 2.25
900-949 (2.30) 2.25 [2.20]
950-999 2.25 [2.20] 2.15
1000-1049**
[2.20]
2.15 2.10
1050-1100 2.15 2.15 2.10
Pressure Switch Standard (.55) Order 8620-189 High Altitude Pressure Switch Kit (.42)
[2.20] orifices are shipped with the unit for field-installed optional
10% input rate
(2.30) is the factory-installed orifice size for full rated
input
At standard conditions: 30.00 inches Mercury, 60F, saturated, .60 specific gravity.
All natural gas factory orifice sizing and standard input ratings based on nominal 1025 BTU/cu. ft. gas and sea level conditions *
**
Bard Part No. Orifice Size (mm) Orifice Diameter
9010-092 2.10 0.0826
9010-088 2.15 0.0846
9010-087 2.20 0.0866
9010-086 2.25 0.0885
9010-082 2.30 0.0905
9010-085 2.35 0.0925
9010-079 2.40 0.0945
9010-084 2.45 0.0964
9010-093 2.50 0.0984
9010-094 2.60 0.1024
9010-095 2.70 0.1063
9010-096 2.75 0.1082
9010-097 2.80 0.1102
9010-098 2.90 0.1142
No. of Orifices Required Based
on Unit Input Rating
41,000 (2)
45,000 (2)
61,000 (3)
68,000 (3)
75,000 (3)
81,000 (4)
90,000 (4)
100,000 (4)
113,000 (5)
125,000 (5)