CleaverBrooks 4WI - Page 100

Adjustment Procedures
6-14
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
The pressure listed are based on 1000 Btu/cu. ft. natural gas at elevations up to 700 feet above sea level. For instal-
lation at higher altitudes, multiply the selected pressure by the proper factor from Table 6.2.
200 2-1/2 19
250 3 23
300 3 32.5
350 3 48.5
400 3 60
500 4 43
600 4 56
700 4 62
800 4 83
TABLE 6-2. Pressure/Altitude Correction Factors
Altitude Feet Above Sea
Level Correction Factor
1000 1.04
2000 1.07
2500 1.09
3000 1.11
4000 1.16
5000 1.21
6000 1.25
7000 1.30
8000 1.35
9000 1.40
NOTE: For undersized or oversized gas trains or altitudes above 9000 feet, contact your local Cleaver-Brooks repre-
sentative.
TABLE 6-1. Minimum Net Regulated Gas Pressure for Rated Boiler Output
Boiler HP Std. Pipe Size (inches)
Pressure Required
(WC)