MC2: 10/03/12 Page
50
of
90
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
GF-115-H
OMM-0083_0B
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
Chap 9:
Maintenance
9.2.4 Replacing the Spark Igniters and Flame Detectors
The Spark Igniter and Flame Detector are replaced per the instructions below.
Replacing the Spark Igniter
The spark igniter for each heat module is installed to the left of the view port as shown in
Figure 9-2
.
Remove and replace as follows:
1. Disconnect the spark igniter ground wire and unplug the igniter cable.
2. Using a Phillips head screwdriver, remove the two (2) screws securing the igniter and remove it from
the boiler.
3. Obtain a replacement igniter from the maintenance kit. Using a spark gap feeler gauge, ensure that
the igniter spark gap is 4mm to 5 mm.
4. Install the replacement igniter and secure it in place with the two (2) screws removed in step (
b
).
5. Reconnect the igniter cable and ground wire
6. Repeat steps (
1
) through (
5
) for each igniter in the Modulex boiler.
Replacing the Flame Detector
The flame detector for each heat module is installed beneath the view port as shown in
Figure 9-2
.
Remove and replace as follows:
1. Disconnect the flame detector wire lead.
2. Using a Phillips head screwdriver, remove the two (2) screws securing the flame detector and remove
it from the boiler.
3. Obtain a replacement flame detector from the maintenance kit.
4. Install the replacement flame detector and secure it in place with the two (2) screws removed in step
(
b
).
5. Reconnect the flame detector wire lead.
6. Repeat steps (
1
) through (
5
) for each flame detector in the boiler.
9.2.5 Testing the Flame Detection Circuitry
The Modulex boiler is designed to automatically shut down in the absence of a flame to prevent the
buildup of unburned fuel in the combustion chamber. Test the circuit by removing a flame detector lead
from any of the burner sections (
Figure 9-2
) while the unit is running. If the unit shuts down after a few
seconds, the flame detection circuitry is functional. If boiler does not automatically shut down, there is a
problem with the circuit. In this case, manually shut down the boiler and contact appropriate technical
help to resolve the problem.
9.3 Fireside Inspection Instructions
This section provides instructions for a Fireside Inspection, including maintenance to the burner
modules, flue collector, spark igniter, and flame detector. A Fireside Inspection Kit
may be purchased
from AERCO. A list of kit part numbers and models are in
Table 9-1
in
Sub-section 9.1
.
Before going through the Fireside Inspection, it is advised to check the CO
2
percentage at the boiler
input. If the CO
2
percentage is within 5% of the value shown in
Table 9-2
, then the burner modules do
not need to be inspected and cleaned. The operation then can be limited to the inspection and cleaning
of the flue collector.
