AERCO BMK 6000 Dual Fuel - Manual (Page 102)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 7 – MAINTENANCE
Page 102 of 219 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0096_0B
03/21/2014
Ph.: 800-526-0288
GF-141
Pilot Regulator Pressure Test Procedure
1. Ensure that gas supply shut-off valve upstream of the unit is still turned OFF.
2. Turn OFF electrical power to the system.
3. Remove the 1/4” NPT plug from the Tee on the outlet side of the Pilot Regulator (Figure 7-
3) and insert a NPT-to-barbed adapter fitting.
4. Attach one end of the plastic tubing to the barbed fitting and the other end to the 16” W.C.
manometer.
5. Remove the cap from the Pilot Regulator to access the gas pressure adjustment. Rotate
the regulator adjustment (beneath cap) clockwise (CW) to its highest possible pressure
setting.
6. Next, rotate the adjustment screw 2 turns counterclockwise (CCW).
7. OPEN the main gas supply upstream of the unit.
8. Turn ON electrical power to the system.
9. Start the boiler in MANUAL Mode. Observe the manometer pressure when the Pilot
solenoid “clicks” open after purge. It should now provide a reading of 4.5 ± 0.5” W.C.
10. Pull out the optical flame scanner and look into the observation port on the front plate.
Ensure that you observe the orange glow of the Pilot flame during the ignition trial period.
11. If the pressure is within specifications, return the unit to service. Make sure that the unit is
operating in AUTO Mode. The “MAN” light in the upper left of the control box should NOT
be lit when in AUTO Mode.
12. If the Pilot Regulator is NOT within specifications, proceed to section 7.5.2 and perform the
Pilot Regulator Pressure Calibration procedure.