AERCO BMK 6000 - Manual (Page 97)

Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 7 – MAINTENANCE
OMM-0086_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 97 of 210
GF-133
Ph.: 800-526-0288
03/20/14
Figure 7-3: Pilot Regulator Mounting Location
7.5.2 Pilot Regulator Pressure Calibration
If the Pilot Regulator pressure is above 5.0”W.C. or below 4.0” W.C., the Pilot Regulator
pressure must be calibrated using the following procedure:
Pilot Regulator Pressure Calibration 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 pipe plug from the 1/4” NPT port 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 pressure regulator and rotate the regulator adjustment
(beneath cap) clockwise (CW) to its highest possible pressure setting.
6. OPEN the main gas supply upstream of the unit.
7. Turn ON electrical power to the system.
8. Start the boiler in the MANUAL Mode. Observe the manometer pressure when the Pilot
solenoid “clicks” open after purge. The manometer should now provide a reading of 4.9”
W.C.
TO AIR/FUEL
VALVE
GAS INLET
DOWNSTREAM
LOW GAS PRESSURE
SWITCH (6.9” W.C.)
HIGH GAS
PRESSURE SWITCH
(10.5” W.C.)
MANUAL
SHUT-OFF
VALVE
UPSTREAM LOW
GAS PRESSURE
SWITCH
LEAK DETECTION PORT WITH BALL VALVE & 1/4" NPT PLUG
TEE WITH
1/4" NPT PLUG
(Install manometer
here for Pilot
Regulator tests)
PILOT
REGULATOR
PILOT
SOLENOID
VALVE