Watts AERCO Benchmark OMM-0136 Operation And Service Manual page 65

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 5 – SAFETY DEVICE TESTING
HIGH Gas Pressure Test Instructions: BMK3000 – 6000 ONLY
7. On the Controller, go to: Main Menu → Diagnostics → Manual Run and then enable the
Manual Mode control.
8. Use the + (Plus) and – (Minus) controls to bring the unit up to 100%.
9. Slowly increase the manifold gas supply pressure by turning the Gas Pressure Adjustment
Screw in the Downstream SSOV (Figure 5-2) 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 13, below.
10. 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.
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. Press the RESET button on the High Gas Pressure switch (see Figure 5-4, below).
13. Readjust the manifold gas supply pressure to what it was before it was increased in step 9.
14. Press the CLEAR button on the Edge Controller to clear the fault.
15. Fire the unit back up to insure gas pressure out of the SSOV is set as it was originally.
16. 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.
17. For Dual Fuel gas trains, repeat this procedure on the Propane gas train, starting with
opening the port on the Propane High Gas Pressure Switch, as shown in Figure 5-4b.
MANUAL SHUT-
OFF VALVE
HIGH Gas
Pressure Port
Install manometer
here for High Gas
Pressure test
Figure 5-4a: HIGH Gas Pressure Test Components – BMK3000 Shown
OMM-0137_E • GF-211 •
12/13/2019
TO
AIR/FUEL
VALVE
HIGH GAS
BALL VALVE
(P/N 22310 shown)
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
NATURAL
SSOV
GAS INLET
HIGH GAS
PRESSURE
Alternative
HIGH Gas
Pressure Port
SWITCH
LOW GAS
PRESSURE
SWITCH
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