Watts Benchmark Aerco OMM-0122 - 2.9.1 Gas Supply Specifications; 2.9.2 Manual Gas Shutoff Valve

Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 2 – INSTALLATION
OMM-0121_D • GF-205 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 27 of 122
2.9.1 Gas Supply Specifications
The gas supply input specifications to the unit are as follows:
The maximum static pressure to the unit must not exceed the following:
TABLE 2-1: Maximum Static Gas Pressure
Model
Natural gas Propane
BMK 750 - BMK 3000
14” W.C. (3.49 kPa) 14” W.C. (3.49 kPa)
Supply piping and pressure to the unit must be sufficient to provide the volume of gas while
maintaining gas pressure listed below while operating at maximum capacity:
TABLE 2-2: Minimum Gas Pressure Requirements
Model Natural gas Propane
BMK 750
4” W.C. (1.0 kPa) 7” W.C. (1.74 kPa)
BMK 1000
4” W.C. (1.0 kPa)
11” W.C. (2.74 kPa)
BMK 1500
4” W.C. (1.0 kPa)
4” W.C. (1.0 kPa)
BMK 2000 *
4” W.C. (1.0 kPa)
4” W.C. (1.0 kPa)
BMK 2500
4” W.C. (1.0 kPa)
4” W.C. (1.0 kPa)
BMK 3000
4” W.C. (1.0 kPa)
4” W.C. (1.0 kPa)
* The BMK 2000 may derate by up to 150,000 BTU’s when operated below 5” W.C. (1245 Pa)
at full fire.
2.9.2 Manual Gas Shutoff Valve
A manual shut-off valve must be installed in the gas supply line upstream of the boiler as shown
in Figure 1-1.