AERCO BMK 6000 Dual Fuel - Manual (Page 84)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 6 – SAFETY DEVICE TESTING
Page 84 of 219 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0096_0B
03/21/2014
Ph.: 800-526-0288
GF-141
High Gas Pressure Fault Test – Continued
5. Open the external gas supply ball valve upstream of the unit.
6. Start the unit in Manual Mode and adjust the Air/Fuel Valve position to bring the unit up to
100%,
7. Slowly increase the manifold gas supply pressure by turning the Gas Pressure Adjustment
Screw in the Downstream SSOV (Figure 6-2) while reading the CO level on the
combustion analyzer. Adjust the manifold pressure until the CO reading is 300 ppm. Note
the number of turns you make, as you will turn it back to its original position in step 10,
below.
Figure 6-2: Gas Pressure Adjustment Screw Location
8. Take a reading of the manifold gas pressure. If the manifold pressure is greater than the
maximum calculated in step 3, then use the Gas Pressure Adjustment Screw to decrease
the manifold pressure until it is at the maximum allowed.
9. Slowly turn the indicator dial on the High Gas Pressure Switch until the unit shuts down
due to a gas pressure fault. This is the setpoint.
10. Readjust the manifold gas supply pressure to what it was before it was increased in step 7.
11. Press the CLEAR button on the Control Panel to clear the fault.
12. Upon test completion, close the ball valve and remove the manometer, and then replace
the 1/4“ plug removed in step 1.
13. Repeat this procedure on the PROPANE gas train, starting with the 1/4“ plug next to the
PROPANE High Gas Pressure switch, shown in the bottom-half of Figure 6-1B.
6.4 LOW WATER LEVEL FAULT TEST
To simulate a low water level fault, proceed as follows:
Low Water Level Fault Test
1. Set the ON/OFF switch to the OFF position
2. Close the water shut-off valves in the supply and return piping to the unit.
3. Slowly open the drain valve on the rear of the unit. If necessary the unit’s relief valve may
be opened to aid in draining.
BRASS HEX HEAD
(Remove to access
the Gas Pressure
Adjustment Screw).