Benchmark Platinum-Edge: Operation-Service Manual
SECTION 3 - START SEQUENCE
OMM-0137_D • GF-211
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7/16/2019
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Start Sequence
Figure 3-4b: BMK 1500 – 6000 Blower Proof Switch
6. Upon completion of the purge cycle, the Controller initiates an ignition cycle and the
following events occur:
a)
T
he Air/Fuel Valve rotates to the low-fire (Ignition) position and closes the ignition
switch. The Dial on the Air/Fuel Valve (Figure 3-5) will read between
25
and
35
to
indicate that the valve is in the low fire position.
b) The Spark Cleaning cycle begins (default duration = 7 sec.) and the Ignition Sequence
screen’s
Spark Cleaning
indicator (Figure 3-3) turns grey. This cycle turns on the
ignition transformer to produce a spark (with no gas flowing) to remove moisture and
carbon buildup from the spark element. For the duration of this cycle, the Controller
displays the
Cleaning Igniter
status message.
c) Following the Spark Cleaning cycle, power is applied to the gas Safety Shut-off Valve
(SSOV). When the SSOV indicates the Gas Valve is OPEN (POC) and the Ignition
Sequence screen’s
Ignition
indicator (Figure 3-3) turns grey.
d) If no spark is present 3 seconds into the ignition trial, the Controller aborts the Ignition
Cycle and shuts down the boiler. Refer to Section 10:
Troubleshooting
in this guide for
guidance if this occurs.
AIR/FUEL VALVE
OUTLET TO BLOWER
BLOCKED
INLET
SWITCH
BLOWER
PROOF
SWITCH
AIR/FUEL VALVE
INLET FROM GAS
TRAIN
