AERCO BMK 6000 Dual Fuel - Manual (Page 81)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 6 – SAFETY DEVICE TESTING
OMM-0096_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 81 of 219
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03/21/2014
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.
Also, it will be necessary to remove the front door and side panels from the
unit to perform the following tests.
ELECTRICAL VOLTAGES IN THIS SYSTEM MAY INCLUDE 208-230 OR
460, 120 AND 24 VOLTS AC. POWER MUST BE REMOVED PRIOR TO
PERFORMING WIRE REMOVAL OR OTHER TEST PROCEDURES THAT
CAN RESULT IN ELECTRICAL SHOCK.
6.2 LOW GAS PRESSURE FAULT TESTS
Refer to Figure 6-1A to locate both Low Gas Pressure switches and the proper locations to
connect the water column manometer when performing the tests in this section.
The Low Gas Pressure Switch is adjustable; the instructions below set it to the correct position.
The instructions below apply to both the Natural Gas and Propane gas trains.
Low Gas Pressure Fault Test
1. Shut off the external gas supply by closing the external gas supply ball valve.
2. Remove the 1/4“ plug from the Tee at the NATURAL GAS Low Gas Pressure Switch
shown in the top-half of Figure 6-1A.
3. Install a NPT-to-barbed fitting and connect a 14“ W.C. to 2 psi manometer where the 1/4"
plug was removed.
4. Apply the readings of the manifold pressure taken in Step 11 of section 4.4 (for Natural
Gas) and Step 10 of section 4.5 (for Propane), and plug them into the following formulas,
which calculate the minimum allowable gas pressure:
•
Natural Gas Pressure ____ x 0.5 + 6.0 = ______ min gas pressure
•
Propane Gas Pressure ____ x 0.5 + 3.7 = ______ min gas pressure
WARNING