AERCO BMK 2000DF - Manual (Page 78)

Benchmark 1500DF - 2000DF Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
Page 78 of 196 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0098_0A
04/01/2014 Ph.: 800-526-0288 GF-144
6.2 LOW GAS PRESSURE FAULT TEST
The instructions below apply to both the BMK 1500DF and BMK 2000DF and to both the
NATURAL GAS and PROPANE gas trains.
Figure 6-1a: Low Gas Pressure Test
To simulate a low gas pressure fault, refer to Figure 6-1a and perform the following steps:
Low Gas Pressure Fault Test
1. Ensure that the appropriate low gas pressure leak detection ball valve (Natural Gas or
Propane) is closed (see Figure 6-1a). Note that there are two Natural Gas leak
detection ball valves (for high and low pressure) but only one on the Propane gas train.
2. 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.
3. Install a 0 – 16“ W.C. manometer or a W.C. gauge where the 1/4" 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 Air/Fuel Valve position (% open) between
25 and 30%.
6. While the unit is firing, slowly close the external manual gas shut-off valve.
TO AIR/FUEL VALVE
MANUAL SHUT-
OFF VALVE
NATURAL GAS
LOW GAS PRESSURE
SWITCH
NATURAL GAS
HIGH GAS
PRESSURE SWITCH
PROPANE
SSOV
PROPANE INLET
NATURAL GAS
SSOV
PROPANE
LOW GAS PRESSURE
SWITCH
PROPANE
HIGH GAS PRESSURE
SWITCH
1/4” NPT PLUG
(Install manometer here for
NATURAL GAS
LOW gas
pressure fault test
1/4” NPT PLUG
(Install manometer here for
PROPANE
LOW gas
pressure fault test
NATURAL GAS INLET
NATURAL GAS
LOW GAS PRESSURE LEAK
DETECTION BALL VALVE
PROPANE
GAS LEAK DETECTION
BALL VALVE