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Benchmark 750-3000 Boiler Operation & Maintenance Manual
SECTION 4 – MAINTENANCE
4.11 PLACING THE BOILER BACK IN SERVICE AFTER A
PROLONGED SHUTDOWN
After a prolonged shutdown (one year or more), the following procedures must be followed:
Placing The Boiler Back In Service After A Prolonged Shutdown
Instructions
1. Review installation requirements included in Section 2 of the Benchmark 750 – 3000
Installation and Startup Guide, OMM-0121 (GF-205).
2. Inspect all piping and connections to the unit.
3. Inspect exhaust vent and air inlet duct work (if applicable).
4. Perform initial startup per Section 4 of the Benchmark 750 – 3000 Installation and Startup
Guide, OMM-0121 (GF-205).
5. Perform safety device testing and scheduled maintenance procedures per Sections 4 and
5 of this manual.
4.12 SPARK MONITOR (AC CURRENT TRANSDUCER)
The spark monitor
(P/N 61034)
transformer and igniter-injector. Wire# 140, connected to the ignition transformer (see Figure 4-
12), passes through the monitor's orifice. If an adequate AC current is not detected in the wire
during ignition, the unit automatically shuts down. The monitor's wires are connected to the
board's Spark Signal terminals (see section 2.11.4 in the
and Startup Guide, OMM-0121 (GF-205) for details ).
Spark
Monitor
To I/O
Tab
Board
Figure 4-12: Spark Detector Sensor (AC Current Transducer) P/N 61034
If the spark monitor needs to be replaced, open the monitor's orifice by pulling on the tab at
the side, remove Wire# 140, disconnect the monitor's wires are from the I/O board, r e m o v e
the old monitor from its position, i n s t a l l a new monitor in its place, r o u t e wire# 140
through the new sensor orifice, and connect the wires to the I/O board's Spark Signal
terminals, red wire to the positive (+) terminal and black to negative (-).
OMM-0122_D • GF-206 • 5/9/2019
evaluates the strength of the current between the ignition
Wire 140
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Benchmark 750 – 3000 Installation
Ignition
Transformer
I/O
Wire 140
Page 58 of 164
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