AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 70)

CHAPTER 6: SAFETY DEVICE TESTING
Page 70 of 162 PR2: 05/09/12
Benchmark 1.5LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0C
GF-121
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
6.5 PROPANE HIGH GAS PRESSURE FAULT TEST
To simulate a propane gas high gas pressure fault, refer to Figure 6-1b and proceed as
follows:
1. Ensure that the Fuel Selector Switch (Figure 4-3) is set to the PROPANE position.
2. Remove the 1/4“ plug from the leak detection ball valve shown in Figure 6-1B.
3. Install a 0 – 16” W.C. manometer (or W.C. gauge) where the 1/4” plug was removed.
4. Slowly open the leak detection ball valve
5. Start the unit in Manual mode at a valve position (firing rate) between 25 and 30%.
6. Slowly increase the gas pressure using the adjustment screw on the SSOV.
7. The unit should shut down and display a HIGH GAS PRESSURE fault message when
the gas pressure exceeds 2.6” W.C. The FAULT indicator should also start flashing.
8. Reduce the gas pressure back to 3.0” W.C.
9. Press the
CLEAR button on the Control Box to clear the fault.
10. The fault message should clear and the FAULT indicator should go off. The unit
should restart.
11. Upon test completion, close the ball valve and remove the manometer. Replace the
1/4“ plug removed in step 2.
6.6 LOW WATER LEVEL FAULT TEST
To simulate a low water level fault:
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.
4. Continue draining the unit until a LOW WATER LEVEL fault message is displayed and
the FAULT indicator flashes.
5. Place the unit in the Manual Mode and raise the valve position above 30%.
6. Set the
ON/OFF switch to the ON position. The READY light should remain off and
the unit should not start. If the unit does start, shut the unit off immediately and refer
fault to qualified service personnel.
7. Close the drain and pressure relief valve used in draining the unit.
8. Open the water shut-off valve in the return piping to the unit.
9. Open the water supply shut-off valve to the unit to refill.
10. After the shell is full, press the
LOW WATER LEVEL RESET button to reset the low
water cutoff.
11. Press the CLEAR button to reset the FAULT LED and clear the displayed error
message.
12. Set the ON/OFF switch to the ON position. The unit is now ready for operation.