AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 73)

TROUBLESHOOTING
TA
BLE 8-
1. BOILER TR
OUBLESHOOTING – Cont
inued
FA
ULT
I
NDI
CA
T
IO
N
PRO
B
A
B
LE CA
USES
T
R
OU
B
L
E
S
H
OOT
IN
G/C
OR
R
E
C
T
IV
E
A
C
T
ION
PRG
SW
T
CH O
PEN
DURING PURGE
1.
Def
ec
tive pur
ge s
w
itc
h.
2.
No voltage pr
es
ent at s
w
itc
h.
3
.
S
w
it
ch
w
ire
d
i
n
co
rre
ct
ly
.
4.
Def
e
c
tive Pow
e
r Supply
Boar
d or
fu
s
e
5.
Def
ec
tive IG
ST
Boar
d
1.
If
the air
-f
uel valve does
r
otate, c
hec
k
the
pur
ge
s
w
itc
h
for
c
ontinuity
w
hen c
los
ing. Replac
e s
w
itc
h if
c
ontinuity
does
not
ex
is
t.
2.
Meas
ur
e
for
24 VAC f
rom
eac
h s
ide of
the s
w
itc
h to gr
ound. If
24VAC is
not pr
es
ent, r
ef
er
f
ault to qualif
ied s
er
v
ic
e per
s
onnel.
3.
Chec
k
to ens
ur
e that the s
w
itc
h is
w
ir
ed c
or
rec
tly
(
c
or
rec
t
w
ir
e
num
ber
s
on the nor
m
ally
open ter
m
inals
).
4.
Chec
k
DS1 & DS2 LEDs
on Pow
er
Supply
Boar
d. If
they
ar
e
not
s
teady
O
N
, r
eplac
e Pow
er
Supply
Boar
d.
5.
Chec
k
“
H
ear
tbeat”
LED DS1 and ver
if
y
it is
blink
ing O
N
& O
F
F
ever
y
s
ec
ond. If
not, r
eplac
e IG
ST
Boar
d.
OUT
D
OOR T
E
M
P
SENSO
R F
A
ULT
1.
Loos
e or
br
ok
en w
ir
ing.
2.
Def
ec
tive Sens
or
.
3.
Inc
or
rec
t Sens
or
.
1.
Ins
pec
t O
utdoor
T
em
per
atur
e s
ens
or
f
or
loos
e or
br
ok
en w
ir
ing.
2.
Chec
k
r
es
is
tanc
e of
s
ens
or
to deter
m
ine if
it is
w
ithin
s
pec
if
ic
ation.
3.
Ens
ur
e that the c
or
rec
t s
ens
or
is
ins
talled.
REMO
T
E
SET
PT
SIG
N
AL F
A
ULT
1.
Rem
ote s
etpoint s
ignal not pr
es
ent:
Not y
et ins
talled.
W
rong polar
ity
.
Signal def
ec
tive at s
our
c
e.
Br
ok
en or
loos
e w
ir
ing.
2.
Signal is
not is
olated (
floating)
if
4 to
20 m
A
.
3.
Contr
ol Box
s
ignal ty
pe s
elec
tion
s
w
itc
hes
not s
et f
or
c
or
rec
t s
ignal
ty
pe (
v
oltage or
c
ur
rent)
.
1.
Chec
k
I/O
Box
to ens
ur
e s
ignal is
hook
ed up.
Hook
up if
not ins
talled.
If
ins
talled, c
hec
k
polar
ity
.
Meas
ur
e s
ignal level.
Chec
k
c
ontinuity
of
w
ir
ing betw
een s
our
c
e and boiler
.
2.
Chec
k
s
ignal at s
our
c
e to ens
ur
e it is
is
olated.
3.
Chec
k
DIP s
w
itc
h on PMC boar
d to ens
ur
e it is
s
et c
or
rec
tly
f
or
the ty
pe of
s
ignal being s
ent. Chec
k
c
ontr
ol s
ignal ty
pe s
et in
Conf
igur
ation Menu.
RESIDUAL
F
L
AME
1.
SSO
V not f
u
lly
c
los
ed.
2.
Def
ec
tive F
lam
e Detec
tor
.
1.
Chec
k
open/c
los
e indic
ator
w
indow
of
Saf
ety
Shut-
O
ff
Valve
(SSO
V)
and ens
ur
e that the SSO
V is
f
u
lly
c
los
ed. If
not f
u
lly
c
los
ed, r
eplac
e the valve and or
ac
tuator
.
Clos
e gas
s
hut-
of
f valve dow
ns
tr
eam
of
SSO
V. Ins
tall a
m
anom
eter
or
gauge in a gas
tes
t por
t betw
een the SSO
V and
the gas
s
hut of
f valve. If
a gas
pr
es
s
ur
e r
eading is
obs
er
ved
replac
e the SSO
V valve and or
ac
tuator
.
2.
Replac
e F
lam
e Detec
tor
.
8
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