Rheem 801T Series Installation Instructions Manual page 36

HIGH ALTITUDE
NATURAL GAS AT HIGH ALTITUDES (cont .)
TABLE 8
SUPPLEMENTAL ORIFICE SIZE CHART
NATURAL GAS ORIFICE SELECTION BASED ON HEATING VALUE & ELEVATION* NATURAL GAS ORIFICE SELECTION BASED ON HEATING VALUE & ELEVATION* NATURAL GAS ORIFICE SELECTION BASED ON HEATING VALUE & ELEVATION*
Notes: Notes: Notes:
Notes:
1. All (-)80+ units are factory equiped with orifices sized for 1050 sea level heating value gas. 1. All (-)80+ units are factory equiped with orifices sized for 1050 sea level heating value gas. 1. All (-)80+ units are factory equiped with orifices sized for 1050 sea level heating value gas.
1. All (-)80+ units are factory equipped with orifices sized for 1050 sea level heating value gas.
2. Installer must be aware of the local heating value (sea level standard) to use the chart below. 2. Installer must be aware of the local heating value (sea level standard) to use the chart below. 2. Installer must be aware of the local heating value (sea level standard) to use the chart below.
2 . Installer must be aware of the local heating value (sea level standard) to use the chart below .
3. This chart is based on the National Fuel Gas Code (NFGC) Annex F based on natural gas with a secific gravity of 0.60 3. This chart is based on the National Fuel Gas Code (NFGC) Annex F based on natural gas with a secific gravity of 0.60 3. This chart is based on the National Fuel Gas Code (NFGC) Annex F based on natural gas with a secific gravity of 0.60
3. This chart is based on the National Fuel Gas Code (NFGC) Annex E, 2015 Edition, based on natural gas with a specific gravity of 0.60
4. The recommended orifices below allow the furnace to operate within 10% of design rate. However, NFGC calculations are the best 4. The recommended orifices below allow the furnace to operate within 10% of design rate. However, NFGC calculations are the best 4. The recommended orifices below allow the furnace to operate within 10% of design rate. However, NFGC calculations are the best
4. The recommended orifices below allow the furnace to operate within 10% of design rate. However, NFGC calculations are the best method.
method. method. method.
5 . Furnace operation is optimized when operating at design rate . Installer is responsible to verify rate .
5. Furnace operation is optimized when operating at design rate. Installer is responsible to verify rate. 5. Furnace operation is optimized when operating at design rate. Installer is responsible to verify rate. 5. Furnace operation is optimized when operating at design rate. Installer is responsible to verify rate.
6 . This table applies to 80+ models only with 25,000BTU/Burner . DO NOT USE THIS CHART FOR ANY 90+ FURNACE MODEL .
6. This table applies to 80+ models only with 25,000BTU/Burner. DO NOT USE THIS CHART FOR ANY 90+ FURNACE MODEL. 6. This table applies to 80+ models only with 25,000BTU/Burner. DO NOT USE THIS CHART FOR ANY 90+ FURNACE MODEL. 6. This table applies to 80+ models only with 25,000BTU/Burner. DO NOT USE THIS CHART FOR ANY 90+ FURNACE MODEL.
Grey Cells Indicate Factory Grey Cells Indicate Factory Grey Cells Indicate Factory
Orifice Size Orifice Size Orifice Size
1,000-1,100 1,000-1,100 1,000-1,100
Gas Heating Gas Heating Gas Heating 900-999 900-999 900-999
Value Value Value
3 3 3
(BTU's/ft (BTU's/ft (BTU's/ft ) ) )
@ Sea @ Sea @ Sea 800-899 800-899 800-899
Level** Level** Level**
700-799 700-799 700-799
*Table is derived from Appendix of the National Fuel Gas Code . To determine the correct orifice for your installation consult the National *Table is derived from Appendix of the National Fuel Gas Code . To determine the correct orifice for your installation consult the National *Table is derived from Appendix of the National Fuel Gas Code . To determine the correct orifice for your installation consult the National
*Table is derived from Appendix of the National Fuel Gas Code. To determine the correct orifice for your installation consult the National Fuel Gas
Fuel Gas Code tables F.1 and F.4 Fuel Gas Code tables F.1 and F.4 Fuel Gas Code tables F.1 and F.4
Code tables E1 .1(a) and E1 .1(d), 2015 Edition
**Be sure to use sea level heating value. When requesting the heating value from a local utility, it must be converted to sea level equivalent **Be sure to use sea level heating value. When requesting the heating value from a local utility, it must be converted to sea level equivalent **Be sure to use sea level heating value. When requesting the heating value from a local utility, it must be converted to sea level equivalent
in order to use this table. in order to use this table. in order to use this table.
36
Sea Level Sea Level Sea Level 2,000' to 2,000' to 2,000' to 3,000' to 3,000' to 3,000' to
to 1,999' to 1,999' to 1,999' 2,999' 2,999' 2,999' 3,999' 3,999' 3,999'
43 43 43 44 44 44 44 44 44
42 42 42 42 42 42 43 43 43
42 42 42 42 42 42 43 43 43
41 41 41
42 42 42 42 42 42
40 40 40 42 42 42
41 41 41
39 39 39 40 40 40 41 41 41
38 38 38 39 39 39 40 40 40
37 37 37
38 38 38 39 39 39
37 37 37 38 38 38 39 39 39
36 36 36 37 37 37 38 38 38
35 35 35
36 36 36 36 36 36
ELEVATION ELEVATION ELEVATION
4,000' to 4,000' to 4,000' to 5,000' to 5,000' to 5,000' to 6,000' to 6,000' to 6,000' to
4,999' 4,999' 4,999' 5,999' 5,999' 5,999' 6,999' 6,999' 6,999'
44 44 44 45 45 45 45 45 45
43 43 43 43 43 43 44 44 44
43 43 43 43 43 43 44 44 44
42 42 42 43 43 43 43 43 43
42 42 42 42 42 42 43 43 43
41 41 41 42 42 42 42 42 42
41 41 41 41 41 41 42 42 42
39 39 39 40 40 40 41 41 41
39 39 39 40 40 40 41 41 41
38 38 38 39 39 39 40 40 40
37 37 37 37 37 37 38 38 38
7,000' to 7,000' to 7,000' to 8,000' to 8,000' to 8,000' to 9,000' to 9,000' to 9,000' to
7,999' 7,999' 7,999' 8,999' 8,999' 8,999' 9,999' 9,999' 9,999'
46 46 46 47 47 47 47 47 47
44 44 44 45 45 45 46 46 46
44 44 44 45 45 45 46 46 46
44 44 44 44 44 44 45 45 45
43 43 43 44 44 44 44 44 44
43 43 43 43 43 43 44 44 44
42 42 42 43 43 43 43 43 43
42 42 42 42 42 42 43 43 43
42 42 42 42 42 42 43 43 43
41 41 41 41 41 41 42 42 42
39 39 39 40 40 40 41 41 41
10,000' 10,000' 10,000'
48 48 48
47 47 47
47 47 47
46 46 46
45 45 45
44 44 44
44 44 44
43 43 43
43 43 43
43 43 43
42 42 42