Installation
50 RT-SVX36K-EN
Table 20. Gas heating capacity altitude correction factors
Altitude (Ft.)
Sea Level - 2000 2001 - 2500 2501 - 3500 3501 - 4500 4501 - 5500 5501 - 6500 6501 - 7500
Capacity
Multiplier
1.00 .92 .88 .84 .80 .76 .72
Note: Correction factors are per AGA Std. 221.30 - 1964, Part VI, 6.12. Local codes may supersede.
Notes:
1. If more than one unit is served by the same main gas supply, consider the total gas input (cubic feet/hr.) and the total length when determining the
appropriate gas pipe size.
2. Obtain the Specific Gravity and BTU/Cu.Ft. from the gas company.
3. The following example demonstrates the considerations necessary when determining the actual pipe size.
Example: A 40' pipe run is needed to connect a unit with a 500 MBH furnace to a natural gas supply having a rating of 1,000 BTU/Cu.Ft. and a specific gravity of 0.60
Cu.Ft/Hour = Furnace MBH Input
Gas BTU/Cu.Ft. X Multiplier (Table 23)
Cu.Ft/Hour = 500
4. Table 24 indicates that a 1-1/4” pipe is required.
Figure 30. Unit gas trains (natural gas) 235, 350 MBH
Figure 31. Unit gas trains (natural gas) 500, 850 MBH
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