Low Gas Pressure Fault Test - Aerco BENCHMARK 2500DF User Manual

Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual

6.2 LOW GAS PRESSURE FAULT TEST

Refer to Figure 6-1A and ensure that the ball valve located at the low gas pressure switch is closed.
TO AIR/FUEL
VALVE
MANUAL SHUT-
OFF VALVE
NATURAL
GAS SSOV
PROPANE
GAS SSOV
1/4" NPT PLUG &
BALL VALVE
(Install Manometer here
for PROPANE GAS low
gas pressure fault test)
Figure 6-1A: Low Gas Pressure Test (BMK 3000DF DBB Gas Train Pictured)
1. Remove the 1/4" plug from the appropriate (Natural Gas or Propane) ball valve at the
associated low gas pressure switch as shown in Figure 6-1A.
2. Install a 0 – 16" W.C. manometer or a W.C. gauge where the 1/4" 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 GAS PRESSURE FAULT fault message at:
• BMK3000 DF = Approx. 7.5" W.C. for Natural Gas and 2.6" W.C. for Propane Gas.
• BMK2500 DF = Approx. 7.5" W.C. for Natural Gas and 3.6" W.C. for Propane Gas.
The FAULT indicator should also start flashing.
Page 78 of 234
05/21/2014
CHAPTER 6 – SAFETY DEVICE TESTING
OPTIONAL
VENTING
Low Gas Pressure Fault Test
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
NATURAL
GAS INLET
PROPANE
GAS INLET
NATURAL GAS
LOW GAS PRESSURE SWITCH
1/4" NPT PLUG & BALL VALVE
(Install Manometer here for
NATURAL GAS low gas
pressure fault test)
PROPANE GAS
LOW GAS PRESSURE SWITCH
OMM-0099_0A
GF-145