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Benchmark 3.0LN 24-Month Maintenance Kit 58015-04
Technical Instruction Document
TID-0135_0C
10
/12/2017
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
•
Phone: 800-526-0288
Page 7 of 20
6.
FIRESIDE INSPECTIONS & COMPONENT REPLACEMENTS
Benchmark 3.0LN heat exchanger fireside inspections include removal of the burner and
exhaust manifold assembly from the boiler. In addition, the 24 Month Inspection Kit includes the
recommended replacement parts for annual maintenance, which should also be performed at
this time. Therefore, the procedures in this section are organized as follows:
Fireside Inspections
:
•
Burner Inspection
•
Exhaust Manifold Inspection
Annual Maintenance Replacements:
•
Burner Component Replacement
•
Condensate Trap Component Replacements
The procedures for the above inspections and replacements are provided in the following
sections.
6.1
Fireside Inspection of Benchmark 3.0 Heat Exchangers
Perform the fireside inspections of the low NOx burner (section 6.1.1) and exhaust manifold
(section 6.1.5).
6.1.1 Burner Inspection
The burner assembly is located at the top of the primary heat exchanger as shown in Figure 4.
1. Ensure that all preliminary set-up and disassembly procedures in section 4 have been
completed.
WARNING!
THE BURNER ASSEMBLY MAY BE EXTREMELY HOT. TO
AVOID BURNS, ALLOW IT TO COOL SUFFICIENTLY BEFORE
ATTEMPTING TO REMOVE IT FOR INSPECTION.
2. Disconnect the lead wire from the flame detector, shown in Figure 5, below.
3. Remove the two (2) screws securing the flame detector to the burner housing flange and
then remove the flame detector and gasket.
4. Disconnect the igniter cable from the igniter (Figure 5), then unscrew and remove the
igniter.
5. Remove the two (2) 10-32 screws securing the staged ignition assembly to the burner
housing and then separate the staged ignition assembly from the burner. Remove the gas
injector gasket (P/N
81070
) from the burner, as it will be replaced during reassembly.
6. Disconnect the burner housing from the blower by removing the six (6) 1/4-20 screws
using a 3/8” wrench.
7. Remove the eight (8) 3/8-16 nuts and washers from the burner flange (Figure 5) using a
9/16” wrench.
8. Remove the burner housing from the burner flange by pulling straight up.
NOTE
The burner housing weighs approximately 20 pounds.
9. Remove the grounding screw.