Benchmark 750-3000 Installation & Startup Manual
SECTION 4
– INITIAL START-UP
OMM-115_D
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GF-200
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5/9/2019
Technical Support
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Figure 4-1d: BMK 3000 1/4 Inch Gas Plug Location
(P/N 22171 shown)
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.
NATURAL
GAS INLET
TO
AIR/FUEL
VALVE
LEAK DETECTION
BALL VALVE
1/4” NPT PLUG
(Install manometer
here for Combustion
Calibration)
HIGH GAS
PRESSURE
SWITCH
LOW GAS
PRESSURE
SWITCH
MANUAL
SHUT-OFF
VALVE
SSOV
