AERCO BMK 3.0 LN Natural Gas July 2011 - Manual (Page 67)

TROUBLESHO
OTING
8-9
TABLE 8-1. BOILER TRO
UBLESHOOTING – Contin
ued
FAULT INDICATION
PROBABL
E CAU
SES
CORRECTI
VE ACTI
O
N
(co
ntinue
d)
2.
Defe
ctive or shorted
swit
ch
.
3.
Switch wi
re
d inco
rrectly.
4.
Defe
ctive Power Su
pply Board o
r
fus
e
5.
D
efec
tive IGST Board
2.
If the Air/Fuel Valve does rota
te to the ignition pos
ition, c
heck
the pu
rge
switch
for co
ntinuity between th
e
N.O
. and
CO
M
terminal
s. If the switch
shows
continu
ity when not in contact
wit
h t
he
cam,
che
ck t
o en
sur
e t
hat
t
he
swit
ch i
s wi
re
d co
rr
ect
ly
(co
rrect
wire
numbe
rs on the normally o
pen termi
nal
s).
3.
If the s
w
itc
h is
w
ired correc
tly, replace the sw
itc
h.
4.
Che
ck DS
1 &
DS2
LED
s o
n Powe
r S
up
ply Board. If t
hey are not
steady O
N
, repla
ce Pow
er Supply Board.
5.
Che
ck “Hea
rtbeat” LE
D D
S
1 and verify
it is blinkin
g ON & OFF
every s
ec
ond. If
not, replace IGST Board.
PRG SWTCH OPEN
DU
RI
N
G
PU
RGE
1.
Defe
ctive purge switch.
2.
No voltage p
rese
nt at switch.
3.
Switch wi
re
d inco
rrectly.
4.
Defe
ctive Power Su
pply Board o
r
fus
e
5.
D
efec
tive IGST Board
1.
If the air
-fuel valve does ro
tate, check
the purge s
w
itc
h for
contin
uity wh
en clo
sin
g. Repl
ace
switch if co
ntinui
ty does not
exis
t.
2.
Measure for 24 VAC from
each si
de of
the switch t
o grou
nd. If
24VAC is
not pres
ent, refer fault
to qualified se
rvice p
ersonn
el.
3.
Che
ck t
o ens
ure t
hat
t
he swit
ch is wi
re
d co
rre
ct
ly
(cor
re
ct
wir
e
numbe
rs on the normally o
pen termi
nal
s).
4.
Che
ck DS
1 &
DS2
LED
s o
n Powe
r S
up
ply Board. If t
hey are not
steady O
N
, repla
ce Pow
er Supply Board.
5.
Che
ck “Hea
rtbeat” LE
D D
S
1 and verify
it is blinkin
g ON & OFF
every s
ec
ond. If
not, replace IGST Board.
O
U
TD
OO
R
TEMP
SENSOR FA
ULT
1.
Loo
se or b
ro
ken wiri
ng.
2. Defe
ctive
Senso
r.
3. Inc
orrec
t Sens
or.
1.
Inspe
ct Outd
oor Te
mpe
rat
ure sen
so
r for loose or b
ro
ken
wirin
g.
2.
Check
res
is
tanc
e of sens
or to determine
if it is
w
ithin
specification.
3.
Ens
ure that the c
orrec
t sens
or is
ins
talled.
REMOTE SETPT
SIGNAL FAULT
1.
Remote
setp
oint sign
al no
t prese
nt:
Not yet ins
talled.
Wrong pol
arit
y.
Signal defe
ctive at source.
Broken or lo
os
e wi
ring.
2.
Signal is not i
solate
d (floati
ng) if 4 to
20 mA.
3.
Control Box signal type sel
ection
swit
che
s not
set for corre
ct signal
type (voltage or cu
rrent).
1.
Check
I/O Box to ens
ure
si
gnal is
hook
ed up.
Hoo
k up if no
t installed.
If inst
alled,
ch
ec
k pola
rit
y.
Measure sig
nal level.
Che
ck co
ntin
uity of wiring betwe
en source an
d boile
r.
2.
Che
ck sig
nal
at
sour
ce t
o e
nsu
re it
is isol
at
ed.
3.
Check
D
IP sw
itc
h on PMC board to ens
ure it is
s
et correc
tly for
the type of signal bei
ng se
nt. Check co
ntrol sig
nal type set in
Config
uratio
n Menu.