AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 72)

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
LINE VO
LT
AG
E
O
U
T
O
F
PHASE
1.
Line and Neutr
al s
w
itc
hed in AC
Pow
e
r Box
.
2.
Inc
or
rec
t pow
er
s
upply
tr
ans
for
m
er
w
ir
ing.
1.
Chec
k
hot and neutr
al in AC Pow
er
Box
to ens
ur
e they
ar
e not
re
v
e
rse
d
2.
Chec
k
tr
ans
for
m
er
w
ir
ing, in AC Pow
er
Box
, agains
t the pow
er
box
tr
ans
for
m
er
w
ir
ing diagr
am
to ens
ur
e it is
w
ir
ed c
or
rec
tly
LO
W
G
AS
PRESSURE
1.
Inc
or
rec
t s
upply
gas
pr
es
s
ur
e.
2
.
D
e
fe
ct
iv
e
L
o
w
P
re
ssu
re
Ga
s S
w
it
ch
1.
Meas
ur
e gas
pr
es
s
ur
e ups
tr
eam
of
the s
upply
gas
r
egulator
w
ith
the unit f
ir
ing. Ref
er
to par
agr
aph 2.7.1 to ens
ur
e that the gas
pr
es
s
ur
e is
c
or
rec
t f
or
the ty
pe of
f
uel and gas
tr
ain being us
ed.
2.
Meas
ur
e gas
pr
es
s
ur
e at the low
gas
pr
es
s
ur
e s
w
itc
h. If
the
pr
es
s
ur
e is
8.5”
W
.C. or
higher
, ins
ur
e that c
ontinuity
ex
is
ts
ac
ros
s
the s
w
itc
h ter
m
inals
indic
ating the s
w
itc
h is
c
los
ed. If
the
pr
es
s
ur
e is
8.5”
W
.C. or
higher
and c
ontinuity
does
not ex
is
t
(s
w
itc
h open)
, r
eplac
e the def
ec
tive s
w
itc
h.
L
O
W WA
T
E
R
LEVEL
1
.
In
su
ff
ici
e
n
t w
a
te
r l
e
v
e
l i
n
sy
st
e
m
2.
D
e
fe
c
tive w
a
ter
level c
ir
c
uitr
y
.
3.
Def
e
c
tive w
a
ter
level pr
obe.
1.
Chec
k
s
y
s
tem
f
or
s
uf
fi
c
ient w
ater
level.
2.
T
es
t w
ater
level c
ir
c
uitr
y
us
ing the Contr
ol Box
f
ront panel LO
W
W
A
T
E
R T
EST
and RESET
buttons
. Replac
e w
ater
level
c
ir
c
uitr
y
if
it does
not r
es
pond.
3.
Chec
k
c
ontinuity
of
pr
obe end to the s
hell, c
hange pr
obe if
ther
e
is
no c
ontinuity
.
MODBUS COMM
FA
UL
T
1.
Boiler
not s
eeing
inf
o
rm
ation
fr
om
Modbus
netw
or
k
1.
Chec
k
netw
or
k
c
onnec
tions
. If
f
ault per
s
is
ts
, c
ontac
t qualif
ied
Ser
v
ic
e Per
s
onnel.
PRG
SW
T
CH CLO
SED
DURING IGNIT
ION
1.
A/F
Valve r
otated open to pur
ge and
did not r
otate to ignition pos
ition
2.
Def
ec
tive or
s
hor
ted 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.
Star
t
the unit. T
he Air
/F
uel Valve s
hould r
otate to the pur
ge
(open)
pos
ition,
then
bac
k
to ignition pos
ition (
tow
ar
ds
c
los
ed)
dur
ing the ignition c
y
c
le. If
the valve does
not
rotate
bac
k
to
the
ignition
pos
ition, c
hec
k
the Air
/F
uel Valve c
a
libr
a
tion. If
c
a
libr
a
tion is
ok
ay
, the pr
oblem
m
a
y
be in the Air
/F
uel Valve or
the Contr
ol Box
. Ref
er
f
ault to qualif
ied s
er
v
ic
e per
s
onnel.
2.
If
the Air
/F
uel Valve does
r
otate
to the ignition pos
ition,
c
hec
k
the
pur
ge s
w
itc
h f
or
c
ontinuity
betw
een the N.O
. and CO
M ter
m
inals
.
If
the
s
w
itc
h
s
how
s
c
ontinuity
w
hen not in c
ontac
t w
ith the c
am
,
c
hec
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
).
3.
If
the s
w
itc
h is
w
ir
ed c
or
rec
tly
, r
eplac
e the s
w
itc
h.
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.
8
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8