AERCO BMK 3.0 LN Nat. Gas Jan 2011 - Manual (Page 55)

MAINTENANCE
7.3 FLAME DETECTOR
The flame detector, part no. 66006, is located in
the body of the b urner ( see F igure 7- 1). T he
flame detec tor m ay b e H OT. Allo w th e un it to
cool s ufficiently bef ore r emoving th e f lame
detector.
To inspect or replace the flame detector:
1. Set the ON/OFF switch on the c ontrol panel,
to the O FF pos ition. Dis connect AC po wer
from the unit.
2. Remove the top panels from the unit.
3. Disconnect the le ad wire f rom the f lame
detector.
4. Remove t he t wo (2 ) screw s se curing t he
flame detector to the burner housing (Figure
7-1). T he f lame detec tor i s s ecured t o t he
burner ho using with on e ( 1) #10- 32 s crew
and one (1) #8-32 screw.
5. Remove the f lame detector and gas ket from
the burner housing.
6. Inspect th e d etector t horoughly. If er oded,
the det ector s hould b e r eplaced. O therwise
clean the detector with a fine emery cloth.
7. Reinstall th e f lame det ector an d f lame
detector gasket.
8. Reconnect the flame detector lead wire.
9. Reinstall the top and side panels on the unit.
7.4 COMBUSTION CALIBRATION
Combustion s ettings m ust be c hecked at the
intervals s hown i n T able 7- 1 as par t of the
maintenance requirements. Ref er to Chapt er 4
for combustion calibration instructions.
7.5 SAFETY DEVICE TESTING
Systematic an d thor ough tests of the oper ating
and safety de vices should be per formed to
ensure t hat t hey ar e op erating as designed.
Certain c ode r equirements, s uch as A SME
CSD-1, require that these tests be performed on
a s cheduled bas is. T est s chedules m ust
conform to local jurisdictions. The results of the
tests s hould be r ecorded in a lo g bo ok. See
Chapter 6-Safety Device Testing Procedures.
7.6 BURNER ASSEMBLY INSPECTION
The burner assembly is located at t he t op f ront
of the unit. T he burner as sembly m ay be hot.
Allow th e un it to c ool s ufficiently bef ore
removing the burner assembly.
The f ollowing r eplacement p arts wil l b e
necessary for reassembly following inspection:
Part No. Description
81030 Burner Gaskets (Qty=2)
81048 Flame Detector Gasket
To inspect or replace the burner assembly:
1. Set the ON/OFF switch on the c ontrol panel,
to the OFF pos ition. Dis connect AC po wer
from the unit and turn off the gas supply.
2. Remove th e s ide and to p pan els f rom the
unit.
3. Disconnect the le ad wire f rom the f lame
detector (see Figure 7-1).
4. Remove t he t wo (2 ) screw s se curing t he
flame detec tor to the b urner h ousing. T he
flame detec tor is s ecured to th e b urner
housing with on e ( 1) #10- 32 s crew a nd o ne
(1) #8-32 screw.
5. Remove the f lame detector and gas ket from
the burner housing.
6. Disconnect the cable from the ignitor-injector.
7. Using a 7/ 16” ope n-end wr ench, dis connect
the compression nut securing the gas injector
tube of the ignitor-injector to the el bow of the
staged i gnition as sembly. Dis connect the
staged ig nition as sembly f rom the ig nitor-
injector.
8. Loosen and r emove th e ig nitor-injector f rom
the burner plate using a 1" wrench.
9. Disconnect the bur ner h ousing f rom the
blower by removing the six (6) 1/4-20 screws
using a 3/8” wrench.
10. Remove the eight ( 8) 3/8-16 n uts f rom the
burner f lange ( Figure 7- 3) us ing a 9/ 16”
wrench.
7-3