CHAPTER 7: MAINTENANCE
PR2: 04/22/13 Page
79
of
158
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0052_0E
GF-127
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
•
Ph: 800-526-0288
12. Disconnect the gas train from the air/fuel valve by removing the four (4) 1/2” bolts and nuts
(Figure 7-5).
13. Disconnect the inlet air flex hose from the air/fuel valve by loosening the hose clamp.
14. Remove the six (6) 1/4-20 hex nuts and flat washers securing the blower to the burner
plate (Figure 7-6).
15. Remove the blower and air/fuel valve from the burner plate by lifting straight up. Also,
remove the blower gasket, which will be replaced with a new gasket.
16. Remove the eight (8) 3/8-16 nuts from the burner flange (Figure 7-5) using a 9/16” wrench.
BLOWER
PROOF
SWITCH
BLOCKED
INLET
SWITCH
AIR/FUEL
VAVLE
STAGED
IGNITION
ASSEMBLY
FLAME
DETECTOR
BURNER
PLATE
HEX NUTS &
WASHERS (6)
BLOWER
GASKET
IGNITOR-
INJECTOR
BURNER
BLOWER
BURNER
GASKET
BURNER
GASKET
Figure 7-6: Burner Assembly Exploded View
NOTE
The burner assembly is heavy, weighing approximately
30 pounds.
17. Remove the burner assembly from burner flange by pulling straight up.
18. Remove and replace the two (2) burner gaskets.
NOTE
During reassembly, apply high-temperature, anti-seize
lubricant to the threads of the igniter-injector and
grounding screw. Also, ensure that the igniter-injector is
properly positioned as indicated in Figure 7-3. Torque the
igniter-injector to 15 ft-lbs.
