Form I-VC/VP-HA, P/N D301004, Page 20
Section 11a - Orifice Pressure Adjustment by Altitude (VPS/VCS) USA
Altitude Natural Gas (“wc)
Feet Meters 60 80 100 125 150 170 170* 200
0-2000 0-610 3.9 3.5 4.5 4.3 4.0 3.3 4.0 3.3
2001-3000 611-915 3.9 3.5 4.5 4.3 4.0 3.3 4.0 3.3
3001-4000 916-1220 3.9 3.5 4.5 4.3 4.0 3.3 4.0 3.3
4001-5000 1221-1524 3.9 3.5 4.5 4.3 4.0 3.3 4.0 3.3
5001-6000 1525-1829 3.9 3.5 4.5 4.3 4.0 3.3 4.0 3.3
6001-7000 1830-2134 3.9 3.5 4.5 4.3 4.0 3.3 4.0 3.3
7001-8000 2135-2439 3.9 3.5 4.5 4.3 4.0 3.3 4.0 3.3
8001-9000 2440-2743 3.9 3.5 4.5 4.2 4.0 3.3 4.0 3.3
9001-10000 2744-3048 3.9 3.5 4.5 4.2 4.0 3.3 4.0 3.3
Orifice Pressure Adjustment by Altitude (VPS/VCS) Canada
Natural Gas (“wc)
Feet Meters 60 80 100 125 150 170 170* 200
0-2000 0-610 3.9 3.5 4.5 4.3 4.0 3.3 4.0 3.3
2001-4500 611-1372 3.7 3.3 4.3 4.1 3.8 3.1 3.8 3.1
Altitude
Section 11b - Btu/h Heat Input by Altitude (VPS/VCS) USA
Altitude Natural Gas Normal Input Btu/h
Feet Meters 60 80 100 125 150 170 170* 200
0-2000 0-610 60,000 80,000 100,000 123,500 150,000 169,000 150,000 200,000
2001-3000 611-915 56,400 75,200 94,000 116,090 141,000 158,860 141,000 188,000
3001-4000 916-1220 55,200 73,600 92,000 113,620 138,000 155,480 138,000 184,000
4001-5000 1221-1524 54,000 72,000 90,000 111,150 135,000 152,100 135,000 180,000
5001-6000 1525-1829 52,800 70,400 88,000 108,680 132,000 148,720 132,000 176,000
6001-7000 1830-2134 51,600 68,800 86,000 106,210 129,000 145,340 129,000 172,000
7001-8000 2135-2439 50,400 67,200 84,000 103,740 126,000 141,960 126,000 168,000
8001-9000 2440-2743 49,200 65,600 82,000 96,950 123,000 138,580 123,000 164,000
9001-10000 2744-3048 48,000 64,000 80,000 94,480 120,000 135,200 120,000 160,000
Btu/h Heat Input by Altitude (VPS/VCS) Canada
Natural Gas Normal Input Btu/h
Feet Meters 60 80 100 125 150 170 170* 200
0-2000 0-610 60,000 80,000 100,000 123,500 150,000 169,000 150,000 200,000
2001-4500 611-1372 54,000 72,000 90,000 111,500 135,000 152,100 135,000 180,000
Altitude
*Generation ZZ model 170 de-rated from 169kBTU to 150kBTU
Note: Burners will naturally de-rate at high altitude.