Benchmark 750-3000 Boiler Operation, Service, Maintenance Guide - KOREA
SECTION 4 – MAINTENANCE
Page
56
of
144
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0128_0B
07/17/2017
Ph.: 800-526-0288
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 Boiler
Installation and Startup Guide Guide
, OMM-0127 (GF-205-K) 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
Wire 140
Wire 140
Ignition
Transformer
