Benchmark Platinum-Edge: Operation-Service Manual
SECTION 5 – SAFETY DEVICE TESTING
OMM-0137_D • GF-211
•
7/16/2019
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HIGH Gas Pressure Test Instructions: BMK 750 – 2500
Figure 5-3c: BMK 2500: HIGH Gas Pressure Fault Test
5.3.2 HIGH GAS PRESSURE TEST: BMK 3000 – 6000 Only
To simulate a high gas pressure fault, refer to Figure 5-4a and 5-4b and perform the following
steps:
HIGH Gas Pressure Test Instructions: BMK 3000 – 6000 ONLY
1. Shut off the
external
gas supply by closing the external gas supply ball valve.
2. Locate the port on the side of the
High Gas Pressure
switch and loosen the screw in the
port a few turns to open it.
Do not completely remove the screw.
Alternatively, you can
remove the 1/4 inch plug shown in Figure 5-4a and 5-4b and install a hose barb fitting in
that location.
3. Attach one end of the plastic tubing to the port or barb fitting and the other end to
a 0 – 16”
W.C. (0 – 4.0 kPa)
manometer.
4. Apply the reading of the manifold pressure taken in Step 21 of Section 4.4.1 (natural gas
units) or Step 21 of Section 4.4.2 (propane units) and plug it into the following formula,
which calculates the
maximum
allowable gas pressure:
BMK 3000
Natural Gas Pressure
______ x 1.5 = ______ max gas pressure
BMK 5000
& 6000
Natural Gas Pressure
______ x 1.5 = ______ max gas pressure
Propane Gas Pressure
______ x 1.5 = ______ max gas pressure
5. Remove the cover from the High Gas Pressure switch and
set the dial indicator to 20
(the
maximum).
SSOV
TO
AIR/FUEL
VALVE
LOW GAS
PRESSURE
SWITCH
MANUAL
SHUT-OFF
VALVE
HIGH GAS
BALL VALVE
1/4” NPT
PLUG
(install
manometer
here for HIGH
GAS
PRESSURE
FAULT TEST)
NATURAL
GAS INLET
HIGH GAS PRESSURE
SWITCH
(P/N 22190 shown)
