Trane IntelliPak with Symbio 800 - Page 45

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Table 16. Propane (LP) – high altitude rating reduction orifice chart
Heater size
(MBh)
0-2000' 3000' 4000' 5000' 6000' 7000' 8000' 9000' 10000'
250 1.75 mm #51 #51 #51 #52 #52 #52 #53 #53
350 #49 #50 #50 #51 #51 #51 #52 #52 #52
500 #50 #51 #51 #51 #52 #52 #52 #53 #53
850
(a)
1.65 mm #52 #53 #53 #53 #53 #54 #54 #54
1200 1.9 mm #49 #49 #50 #50 #50 #51 #51 #52
Note: Orifice sizes required to reduce input ratings by 4% per every 1000’ above 2000’ per the National Fuel Gas Code Z223.1.
(a)
850,000 Btu/Hr at Sea Level input is 737,000 Btu/Hr
Installation