AERCO BMK 2.0 LN Nat. Gas June 2010 - Manual (Page 51)

SAFETY DEVICE TESTING
CHAPTER 6 SAFETY DEVICE TESTING
6.1 TESTING OF SAFETY DEVICES
Periodic safety device testing is required to
ensure that the control system and safety
devices are operating properly. The boiler
control system comprehensively monitors all
combustion-related safety devices before, during
and after the start sequence. The following tests
check to ensure that the system is operating as
designed.
Operating controls and safety devices should be
tested on a regular basis or following service or
replacement. All testing must conform to local
codes such as ASME CSD-1.
NOTE
MANUAL and AUTO modes of operation
are required to perform the following
tests. For a complete explanation of these
modes, see Chapter 3.
NOTE
It will be necessary to remove the front
door and side panels from the unit to
perform the following tests.
WARNING
ELECTRICAL VOLTAGES IN THIS
SYSTEM MAY INCLUDE 120 AND 24
VOLTS AC. POWER MUST BE RE-
MOVED PRIOR TO PERFORMING
WIRE REMOVAL OR OTHER TEST
PROCEDURES THAT CAN RESULT
IN ELECTRICAL SHOCK.
6.2 LOW GAS PRESSURE FAULT TEST
Refer to Figure 6-1 and ensure that the leak
detection ball valve located at the high gas
pressure switch is closed.
1. Remove the 1/8 “ plug from the ball valve at
the low gas pressure switch shown in the
lower portion of Figure 6-1.
2. Install a 0 – 16 “ W.C. manometer or a W.C.
gauge where the 1/8" plug was removed.
3. Slowly open the ball valve near the low gas
pressure switch.
4. Place the unit in Manual Mode and adjust
the air/fuel valve position (% open) between
25 and 30%.
5. While the unit is firing, slowly close the
external manual gas shut-off valve.
6. 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.
Figure 6-1
Low & High Gas Pressure Testing
7. Fully open the external manual gas shut-off
valve and press the CLEAR button on the
Control Box.
8. The fault message should clear and the
FAULT indicator should go off. The unit
should restart.
9. Upon test completion, close the ball valve
and remove the manometer. Replace the
1/8 “ plug removed in step 1.
6-1