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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 4 – INITIAL START-UP
4.2.2 Installing Gas Supply Manometer
The gas supply manometer (or gauge) is used to monitor the gas pressure on the downstream
side of the SSOV during the Combustion Calibration procedures described in Section 4.4.1:
Natural Gas Combustion Calibration or Section 4.4.2: Propane Gas Combustion Calibration
The gas supply manometer is installed at the upstream and/or downstream location shown in
Figure 4-1a through 4-1d.
To monitor the gas pressure on the downstream side of the SSOV during Combustion
Calibration (in Section 4.4, below), install the 16" W.C. (4.0 kPa) manometer(s) as described in
the following steps:
Gas Supply Manometer Installation Instructions
1. Turn off the main gas supply upstream of the unit.
2. Remove the top panel and front panel from the boiler to access the gas train components.
3. Remove the 1/4" NPT plug from the leak detection ball valve on the downstream side of
the SSOV as shown in Figure 4-1a – 4-1d.
4. Install a NPT-to-barbed fitting into the tapped plug port.
5. Attach one end of the plastic tubing to the barbed fitting and the other end to the 16" W.C.
(4.0 kPa) manometer.
MANUAL
SHUT-OFF
VALVE
NATURAL GAS INLET
LEAK DETECTION BALL VALVE
Figure 4-1a: BMK 750 & 1000 1/4 Inch Gas Plug Location
OMM-0121_D • GF-205 • 5/9/2019
TO AIR/FUEL
VALVE
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
SSOV
1/4" NTP PLUG
(Install manometer
here for combustion
calibration)
Page 58 of 122
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