AERCO BMK 3.0 LN Nat. Gas Jan 2011 - Manual (Page 56)

MAINTENANCE
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 bur ner hous ing is h eavy, weighing
approximately 25 pounds.
11. Refer to the ex ploded v iew in F igure 7- 4.
Remove the bur ner hou sing f rom bur ner
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 th e bur ner r emoved in s tep
13, reinstall all the components in the reverse
order that they were removed.
16. Make s ure to ali gn th e bu rner hous ing with
the blower and the heat exchanger top head.
17. Check to ens ure that t he grounding screw is
reinstalled. Also, ens ure that c onductive,
high-temperature, a nti-seize c ompound is
applied to th e thr eads of the gr ound s crew
and th e ig nitor-injector. T orque th e ig nitor-
injector t o 8 0 t o 9 0 in-lbs. H owever, if t he
burner housing w as r eplaced during
inspection, tor que to 18 0 i n-lbs, then l oosen
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 Benc hmark 3.0 B oiler c ontains t wo
condensate traps as shown in Chapter 2, Figure
2-5. One trap is located external to t he unit and
attached to the drain p ipe f rom the c onnecting
manifold. The other trap is an integral part of the
exhaust m anifold. T hese tr aps s hould b e
inspected an d, if nec essary, c leaned t o ens ure
proper o peration. F ollow the pr ocedures i n
paragraphs 7.7.1 and 7.7.2.
7.7.1 Connecting Manifold Condensate
Trap
To ins pect an d c lean t he condensate tr ap ( part
no. 24060) attached to the connecting manifold,
proceed as follows:
1. Loosen th e t humbscrew securing the tr ap
adaptor (Figure 2-6) to th e condensate drain
pipe on the connecting manifold.
2. Remove the n ipples and c onnections on the
inlet and out let sides of the condensate trap
shown in Figure 7-5.
7-4