RT-SVX072A-EN
43
Table 16. Gas heating capacity altitude correction factors
Altitude (Ft.)
Sea Level To
2000
2001 to
2500
2501 to
3500
3501 to
4500
4501 to
5500
5501 to
6500
6501 to
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.
Table 17. Natural gas -2–stage and modulating gas heat settings
Natural Gas
Burner Size
Low Fire
High Fire
Shutter
Setting
Ratio
Regulator
Turns
VDC
Input
Signal
(a)
P0 P1
VDC
Input
Signal
P2
235 MBH 2-stg n/a 1780 1780 10 3250 1 5 1/2
350 MBH 2-stg n/a 2200 2200 10 3650 0.5 4 1/2
500 MBH 2-stg n/a 2900 2900 10 4900 1.5 4
500 MBH Mod 0 1900 1900 10 4900 1.5 4
800 MBH 2-stg
(b)
n/a 2280 2280 10 3950 4.5 4 7/8
800 MBH Mod
(b)Installation_
Connect Gas Supply Line to Furnace
Gas Train
0 1130 1130 10 3950 4 4 7/8
850 MBH 2-stg n/a 2290 2290 10 4070 3 5 1/2
850 MBH Mod 0 1130 1130 10 4150 3 5
1000 MBH 2-stg n/a 2800 2800 10 5150 3 4 3/4
1000 MBH Mod
0 1200 1200 10 5150 3 4.75
Note: P0, P1, and P2 are fan speed settings in the Seimens controller. The default speeds have been preset at the factory and normally do not
need field adjustment.
(a)
binary input for 2-stage
(b)
800MBH is Horizontal Discharge. MBH is listed on gas heat rating plate.
Table 18. LP gas – 2-stage and modulating gas heat settings
Propane
Burner Size
Low Fire
High Fire
Shutter
Setting
Ratio
Regulator
Turns
Orifice Size
VDC
Input
Signal
(a)
P0 P1
VDC
Input
Signal
P2
235 MBH 2-stg n/a 1930 1930 10 3380 1.5 4 1/4 0.302
350 MBH 2-stg n/a 2050 2050 10 3300 1.5 4 0.396
500 MBH 2-stg n/a 2650 2650 10 4600 1 4 1/2 0.396
500 MBH Mod 0 1900 1900 10 4600 1 4 1/2 0.516
800 MBH 2-stg
(b)
n/a 2100 2100 10 3760 2.5–3 4 7/8 0.516
800 MBH Mod
(b)
0 1150 1150 10 3680 3 5 0.516
850 MBH 2-stg n/a 2290 2290 10 3930 2.5 5 0.516
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