Install Instructions

58
APPENDIX F – ADJUSTING GAS INPUT RATE
Natural Gas Boilers:
Check Manifold Pressure:
1. Note the rated manifold gas pressure listed
on the boiler’s rating label.
2. Connect Manometer to manifold pressure
tapping on Gas Valve (Figure F-1).
3. Light main burners by adjusting thermostat
to highest setting.
4. 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.
5. If required, adjust gas manifold pressure to
the rated setting by turning the gas valves
adjustment screw clockwise to increase
manifold pressure or counterclockwise to
decrease manifold pressure (Figure F-2).
Several turns may be required.
Do not force the adjustment screw.
DO NOT EXCEED the boiler’s rated gas
input.
6. Recheck Main Burner Flame.
Leak Test Gas Piping:
THE BOILER AND ITS GAS
CONNECTIONS must be leak tested and
leak free before placing boiler in operation.
FOR LEAK TESTING OVER ½ PSIG,
disconnect boiler and its individual shut-off
valve from gas supply piping.
1. For testing at ½ psig or less, isolate boiler
from gas supply piping by closing boiler’s
individual manual shut-off valve.
2. Check for gas leaks in all piping joints,
valves, and ttings using a non-corrosive
leak detection solution or an electronic leak
detector.
3. Repair any leaks.
F-1
F-2
NOTICE
ESC boilers built for altitudes greater than 4,999 feet above sea level do not need to be re-oriced. The ESC
boiler “H” Model has been certied 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 to 10,000 feet above sea level.
For applications above 10,000 feet, please follow recommendations in current version of NFPA 54.