Benchmark Platinum-Edge: Operation-Service Manual
SECTION 5 – SAFETY DEVICE TESTING
OMM-0137_D • GF-211
•
7/16/2019
Technical Support
•
(800) 526-0288
•
Mon-Fri, 8 am - 5 pm EST Page 55 of 146
LOW Gas Pressure Test Instructions: BMK 3000 – 6000 Only
6. Remove the cover from the Low Gas Pressure switch and set the dial indicator to
2
(the
minimum).
7. Open the external gas supply ball valve upstream of the unit.
8. On the Controller, go to:
Main Menu
Diagnostics
Manual
Run
and then enable the
Manual Mode
control.
9. Adjust the Air/Fuel Valve position to
100%
using the
+
(Plus) and
–
(Minus) controls.
10. While the unit is firing, read the CO value on the combustion analyzer and slowly decrease
the incoming gas supply pressure until the CO reading is
approximately 300 ppm
.
11. Take a reading of the inlet gas pressure. If the inlet pressure is below the minimum
calculated in step 5, above, then increase the pressure to match the calculated minimum.
12. Slowly turn the indicator dial on the
Low Gas Pressure
switch until the unit shuts down due
to a gas pressure fault.
13. Readjust the inlet gas pressure to what it was prior to the test.
14. Press the Edge Controller’s
CLEAR
button to clear the fault.
15. The fault message should clear, the red
FAULT
LED go off, and the unit should restart.
16. For Dual Fuel units, repeat the previous procedure on the
Propane
gas train, starting with
the
Propane
Low Gas Pressure Switch.
Figure 5-2a: LOW and HIGH Gas Pressure Test Components – BMK 3000
TO
AIR/FUEL
VALVE
MANUAL SHUT-
OFF VALVE
SSOV
LOW Gas
Pressure Port
Install manometer here for
Low Gas Pressure test
LOW GAS
PRESSURE
SWITCH
HIGH GAS
PRESSURE
SWITCH
Alternative
LOW Gas
Pressure Port
LOW GAS
BALL VALVE
NATURAL
GAS INLET
(P/N 22310 shown)
