Install Instructions
58
APPENDIX F – ADjustINg gAs INPut RAtE
Input ratings shown on boiler rating label can
be used for elevations up to 2000 ft above sea
level. For elevations 2000 ft to 10,000 ft, reduce
input rate 2 percent per 1000 ft above sea level.
For elevations over 10,000 ft, reduce input rate 4
percent per 1000 ft above sea level.
Check gas input rate to boiler. Do not exceed
input rate shown on rating label or reduced input
required for elevations 2000 ft or higher.
1. Verify inlet gas pressure (1) does not exceed
maximum inlet gas pressure shown on rating
label; and (2) exceeds minimum inlet gas
pressure shown on rating label.
2. Connect manometer or pressure gauge to
gas valve outlet pressure tap (see Figure
F-1). Place shut-off valve between gas
valve and manometer (gas pressure can be
introduced gradually to avoid pressure surge
when gas valve opens that could blow liquid
out of manometer).
3. Gas valve has step-opening regulator,
which initially opens at a lower manifold
pressure and then steps to full pressure after
approximately 30 seconds. Check manifold
pressure after step has occurred.
Do not force the adjustment screw.
4.
Adjust gas valve pressure regulator to
provide outlet pressure of 10 inches water
column.
or
Natural Gas. Adjust gas valve pressure
regulator to provide outlet pressure of 3.5
inches water column. Check input rate by
clocking gas meter.
necessary, to change input rate (turn
counterclockwise to decrease pressure
and decrease input rate, see Figure F-2).
wholesale distributor for alternate main
than 3.2 inches water column or greater
than 3.8 inches water column. Provide
gas pressure and measured input rate.
5.
F-1
F-2
NOtICE
ESC boilers built for altitudes greater than 4,999 feet above sea level do not need to be re-oriced. The ESC
boiler “H” Model has been certied to operate in atmospheric conditions from 5,000 to 10,000 feet above sea
level. Input is naturally derated approximately 2% per every 1000 feet above sea level.
The ESC boiler is available in two (2) altitude Models: The “S” Model 0 to 4,999 feet above sea level, and the
“H” Model 5,000 feet above sea level and higher.