Maintenance – AERCO BMK 3.0 LN Natural Gas July 2011 User Manual
Page 56
MAINTENANCE
7-4
STAGED
IGNITION
ASSEMBLY
3/8-16
NUTS (8)
BURNER
HOUSING
1/4-20
SCREWS
(6)
GROUNDING
SCREW
Figure 7-3
Burner Disassembly Diagram - Top View
NOTE
The burner housing is heavy, weighing
approximately 25 pounds.
11. Refer to the exploded view in Figure 7-4.
Remove the burner housing from burner
flange by pulling straight up.
12. Remove the grounding screw.
13. Remove the burner by pulling straight up.
14. Remove and replace the burner gaskets.
15. Beginning with the burner removed in step
13, reinstall all the components in the reverse
order that they were removed.
16. Make sure to align the burner housing with
the blower and the heat exchanger top head.
17. Check to ensure that the grounding screw is
reinstalled. Also, ensure that conductive,
high-temperature, anti-seize compound is
applied to the threads of the ground screw
and the ignitor-injector. Torque the ignitor-
injector to 80 to 90 in-lbs. However, if the
burner housing was replaced during
inspection, torque to 180 in-lbs, then loosen
and re-tighten to 80 to 90 in-lbs.
IGNITOR-
INJECTOR
FLAME
DETECTOR
STAGED IGNITION
ASSEMBLY
BURNER GASKET
BURNER
BURNER GASKET
BURNER
HOUSING
Figure 7-4
Burner Assembly - Exploded View
7.7 CONDENSATE DRAIN TRAPS
The Benchmark 3.0 Boiler contains two
condensate traps as shown in Chapter 2, Figure
2-5. One trap is located external to the unit and
attached to the drain pipe from the connecting
manifold. The other trap is an integral part of the
exhaust manifold. These traps should be
inspected and, if necessary, cleaned to ensure
proper operation. Follow the procedures in
paragraphs 7.7.1 and 7.7.2.
7.7.1 Connecting Manifold Condensate
Trap
To inspect and clean the condensate trap (part
no. 24060) attached to the connecting manifold,
proceed as follows:
1. Loosen the thumbscrew securing the trap
adaptor (Figure 2-6) to the condensate drain
pipe on the connecting manifold.
2. Remove the nipples and connections on the
inlet and outlet sides of the condensate trap
shown in Figure 7-5.