AERCO BMK 3.0 LN Natural Gas July 2011 - Manual (Page 63)

TROUBLESHOOTING
8
-
5
TABLE 8-1. BOILER TRO
UBLESHOOTING – Contin
ued
FAULT INDICATION
PROBABL
E CAU
SES
CORRECTI
VE ACTI
O
N
(co
ntinue
d)
7.
Carbon o
r oth
er deb
ris on
Burne
r
8.
Staged ignitio
n ball valve cl
ose
d.
9.
Staged ignitio
n sole
noid val
ve
doe
sn’t ope
n.
10.
Clogg
ed sta
ged ignition
pi
ece.
7.
Remove th
e burn
er a
nd in
spe
ct for any
carbon
or de
bris.
Clea
n
and rei
nstall.
8.
Open 1/4
” bal
l valve down
stream of the SSOV (see Fi
gure 8-1
).
9.
Whe
n boil
er
goe
s to ig
nition, listen
to t
he
solen
oid v
alve for
a
clickin
g so
un
d to ensu
re it is ope
ning.
10.
Remove an
d inspe
ct stag
ed ignition pi
ece for
blockage.
FLAME LOS
S
DU
RI
N
G
R
U
N
1.
Wo
rn Flame
Dete
ctor o
r cracked
cer
ami
c.
2.
Defe
ctive SSOV Regul
ator.
3.
Poor combu
stion calib
ratio
n.
4.
Deb
ris o
n bu
rner.
5.
Blocked cond
ensate drai
n.
1.
Remove a
nd
insp
ect the Fl
ame Dete
cto
r for sign
s of wea
r or
cra
cked
ce
ra
mic.
Repl
ac
e if
nece
ss
ary
.
2.
Che
ck ga
s pressure re
adin
gs u
sing a g
auge or m
ano
meter into
and out of the Air/Fuel Valve to
ensu
re th
at the gas p
re
ssures
into and out o
f the valve are corre
ct.
3.
Che
ck com
bu
stion calibration. Adjust as
necessa
ry.
4.
Remove the
burn
er a
nd in
spe
ct for any
carbon o
r de
bris. Cl
ean
and rei
nstall.
5.
Remove bl
ockag
e in co
nd
ensate drai
n.
HEAT DEMA
ND
FAILURE
1.
The He
at De
mand Relays
on the
Ignition/Stepp
er boa
rd faile
d to
ac
tivate when c
ommanded
2.
Relay is a
ctivated wh
en no
t in
Dema
nd
1.
Press
CLEAR
button and res
tart th
e unit. If
the fa
ult pers
is
ts
,
repla
ce Igniti
on/Steppe
r (IGST) Boa
rd.
2.
Defe
ctive rela
y. Replace IGST Board.
HIGH EXHA
U
ST
TEMPERATURE
1.
Defe
ctive exhaust sen
sor.
2.
Carbon
ed he
at exchan
ger
due to
inco
rrect com
bustio
n cali
bration
1.
Measure the actual exh
au
st te
mperature and cont
inu
ity of
the
exhau
st sen
sor. If the exh
aust tempe
rat
ure is le
ss than 475
o
F
and the exha
ust se
nsor
sh
ows co
ntinuit
y replace the sen
so
r.
2.
If exhaust temperature i
s greate
r than
500
o
F,
che
ck
comb
ustio
n calibratio
n. Cal
ibrate o
r rep
air as ne
ce
ssa
ry.