High Gas Pressure Test; High Gas Pressure Test: Bmk 750 - 2500 - Watts Aerco Benchmark OMM-0116 Installation And Start-Up Manual

Benchmark 750-3000 Installation & Startup Manual
SECTION 5 – SAFETY DEVICE TESTING

5.3 HIGH GAS PRESSURE TEST

Complete the instructions in Section 5.3.1 for BMK 750 – 2500 units, or in Section 5.3.2 for BMK
3000 units, which have different High Gas Pressure switches.
5.3.1 HIGH GAS PRESSURE TEST: BMK 750 – 2500
To simulate a high gas pressure fault, refer to Figure 5-3a through 5-3c and perform the
following steps:
HIGH Gas Pressure Test Instructions: BMK 750 – 2500
1. Close the leak detection ball valve located at the High Gas Pressure switch.
2. Remove the 1/4" NPT plug from the High Gas pressure leak detection ball valve shown in
Figures 5-3a through 5-3c.
3. Install a 0 - 16" W.C. (0 – 4.0 kPa) manometer or gauge where the 1/4" plug was removed.
4. Slowly open the leak detection ball valve.
5. Press the MENU key on the C-More Controller and access the Setup menu, enter the
password 6817 and then press the ENTER key.
6. Start the unit in MANUAL mode at a valve position (firing rate) between 25% and 30%.
7. With the unit running, monitor the gas pressure on the manometer installed in step 2 and
record the gas pressure reading.
8. Slowly increase the gas pressure using the adjustment screw on the SSOV while
counting the number of turns you make.
9. The FAULT indicator should start flashing and the unit should shut down and display a
GAS PRESSURE fault message at approximately the value shown in Table 5-2 (the
pressure setting of the HIGH Gas Pressure switch):
TABLE 5-2: HIGH Gas Pressure, ± 0.2" W.C. (± 50 Pa)
Benchmark Model
BMK 750/1000 FM & DBB Single-Fuel
BMK 1500/2000 Single-Fuel
BMK 1500/2000 DBB Single-Fuel
BMK 1500/2000 Dual-Fuel
BMK 1500/2000 DBB Dual-Fuel
BMK 2500 FM & DBB Single-Fuel
BMK 2500 Dual-Fuel
BMK 2500 DBB Dual-Fuel
BMK 3000 FM & DBB Single-Fuel
BMK 3000 Dual-Fuel
BMK 3000 DBB Dual-Fuel
10. Reduce the gas pressure by returning the SSOV adjustment screw back to its position
before starting step 7 (the value recorded in step 6). This pressure should be within the
range used during combustion calibration, shown in Table 4-1 (Natural Gas) and Table 4-4
(Propane gas).
• •
OMM-115_D GF-200 5/9/2019
Natural Gas
4.7" W.C. (1.17 KPa)
4.7" W.C. (1.17 KPa)
4.7" W.C. (1.17 KPa)
4.7" W.C. (1.17 KPa)
3.5" W.C. (0.87 kPa)
3.0" W.C. (0.75 kPa)
7.0" W.C. (1,74 kPa)
7.0" W.C. (1,74 kPa)
3.0" W.C. (0.75 kPa)
6.6" W.C. (1,64 kPa)
6.6" W.C. (1,64 kPa)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
126
Propane
4.7" W.C. (1.17 KPa)
–
–
4.7" W.C. (1.17 KPa)
3.5" W.C. (0.87 kPa)
–
2.6" W.C. (0.65 kPa)
2.6" W.C. (0.65 kPa)
–
2.6" W.C. (0.65 kPa)
2.6" W.C. (0.65 kPa)
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