Benchmark 750-3000 Installation & Startup Manual
SECTION 5
– SAFETY DEVICE TESTING
OMM-115_D
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•
5/9/2019
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126
HIGH Gas Pressure Test Instructions: BMK 3000 ONLY
to 100%.
8. Slowly increase the manifold gas supply pressure by turning the Gas Pressure Adjustment
Screw in the Downstream SSOV (Figure 4-3) while reading the CO level on the
combustion analyzer. Adjust the manifold pressure until the CO reading is
approximately
300 ppm
. Note the number of turns you make, as you will turn it back to its original position
in step 10, below.
9. Take a reading of the manifold gas pressure. If the manifold pressure is
greater
than the
maximum calculated in step 3, then use the Gas Pressure Adjustment Screw to decrease
the manifold pressure until it is at the maximum allowed.
10. Press the
RESET
button on the High Gas Pressure switch (see Figure 5-4, below).
11. Slowly turn the indicator dial on the High Gas Pressure switch until the unit shuts down due
to a gas pressure fault. This is the setpoint.
12. Readjust the manifold gas supply pressure to what it was before it was increased in step 7.
13. Press the
CLEAR
button on the C-More Controller to clear the fault.
14. Upon test completion, close the ball valve and remove the manometer fitting from the port,
and then turn the port screw clockwise till the port is closed.
Figure 5-4:
BMK 3000
HIGH Gas Pressure Test Components
TO
AIR/FUEL
VALVE
MANUAL SHUT-
OFF VALVE
HIGH Gas
Pressure Port
Install manometer
here for High Gas
Pressure test
LOW GAS
PRESSURE
SWITCH
HIGH GAS
PRESSURE
SWITCH
Alternative
HIGH Gas
Pressure Port
HIGH GAS
BALL VALVE
SSOV
NATURAL
GAS INLET
(P/N 22171 shown)
