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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 4 – INITIAL START-UP
TO
AIR/FUEL
VALVE
MANUAL
SHUT-OFF
VALVE
HIGH GAS
PRESSURE
SWITCH
LEAK DETECTION
Figure 4-1d: BMK 3000 1/4 Inch Gas Plug Location
4.2.3 Accessing the Analyzer Probe Port
The unit contains a 1/4" NPT port on the side of the exhaust manifold as shown in Figure 4-2a
and 4-2b. Prepare the port for the combustion analyzer probe as follows:
Analyzer Probe Port Access Instructions
1. Refer to Figure 4-2a or 4-2b and remove the 1/4" NPT plug from the exhaust manifold.
2. If necessary, adjust the stop on the combustion analyzer probe so it will extend mid-way
into the flue gas flow. DO NOT install the probe at this time.
OMM-0121_D • GF-205 • 5/9/2019
1/4" NPT PLUG
BALL VALVE
(Install manometer
here for Combustion
Calibration)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
NATURAL
GAS INLET
SSOV
LOW GAS
PRESSURE
SWITCH
Page 60 of 122
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