Watts AERCO Benchmark OMM-0121, Operation And Maintenance Manual, Page: 58 / 164

Benchmark 750-3000 Boiler Operation & Maintenance Manual
SECTION 4 – MAINTENANCE
OMM-0122_D
•
GF-206
•
5/9/2019
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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 ) evaluates the strength of the current between the ignition
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
I/O
board’s Spark Signal terminals (see section 2.11.4 in the
Benchmark 750 – 3000 Installation
and Startup Guide , OMM-0121 (GF-205) for details).
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 (-).
Tab
To I/O
Board
Spark
Monitor
Ignition
Transformer
Wire 140
Wire 140