AERCO BMK 3.0 LN Dual-Fuel Series Gas Fired Low NOx Boiler System - Manual (Page 50)

SAFETY DEVICE TESTING
6-2
6.3 PROPANE LOW GAS PRESSURE
SWITCH TEST
Refer to Figure 6-1 and ensure that the leak
detection ball valve located at the top of the gas
train by the high gas pressure switches is
closed.
1. Ensure that the Fuel Selector Switch (Figure
4-3) is set to the PROPANE position.
2. Remove the 1/8“ plug from the ball valve at
the propane low gas pressure switch shown
in the lower-right portion of Figure 6-1.
3. Install a 0 – 16 “ W.C. manometer or a W.C.
gauge where the 1/8" plug was removed.
4. Slowly open the ball valve near the low gas
pressure switch.
5. Place the unit in Manual Mode and adjust
the valve position between 25 and 30%.
6. While the unit is firing, slowly close the
external manual gas shut-off valve.
7. The unit should shut down and display a
LOW GAS PRESSURE fault message at
approximately 2.6” W.C. The FAULT indi-
cator should also start flashing.
8. Fully open the external manual gas shut-off
valve and press the CLEAR button on the
Control Box.
9. The fault message should clear and the
FAULT indicator should go off. The unit
should restart.
10. Upon test completion, close the ball valve
and remove the manometer. Replace the
1/8 “ plug removed in step 2.
6.4 NATURAL GAS HIGH GAS
PRESSURE SWITCH TEST
To simulate a natural gas high gas pressure
fault, refer to Figure 6-1 and proceed as follows:
1. Ensure that the Fuel Selector Switch (Figure
4-3) is set to the NATURAL GAS position.
2. Remove the 1/8“ plug from the leak
detection ball valve shown in the upper
portion of Figure 6-1.
3. Install a 0 – 16” W.C. manometer (or W.C.
gauge) where the 1/8” plug was removed.
4. Slowly open the leak detection ball valve.
5. Start the unit in Manual mode at a valve
position between 25 and 30%.
6. Slowly increase the gas pressure using the
adjustment screw on the natural gas SSOV.
7. The unit should shut down and display a
HIGH GAS PRESSURE fault message
when the gas pressure exceeds 7” W.C.
The FAULT indicator should also start
flashing.
8. Reduce the gas pressure back to 5” 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
1/8“plug removed in step 2.
6.5 PROPANE HIGH GAS PRESSURE
SWITCH TEST
To simulate a propane high gas pressure fault,
refer to Figure 6-1 and proceed as follows:
1. Ensure that the Fuel Selector Switch (Figure
4-3) is set to the PROPANE position.
2. Remove the 1/8“ plug from the leak
detection ball valve shown in the upper
portion of Figure 6-1.
3. Install a 0 – 16” W.C. manometer (or W.C.
gauge) where the 1/8” plug was removed.
4. Slowly open the leak detection ball valve.
5. Start the unit in Manual mode at a valve
position between 25 and 30%.
6. Slowly increase the gas pressure using the
adjustment screw on the propane SSOV.
7. The unit should shut down and display a
HIGH GAS PRESSURE fault message
when the gas pressure exceeds 3.5” W.C.
The FAULT indicator should also start
flashing.
8. Reduce the gas pressure back to 2.1” 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
1/8“ plug removed in step 2.