AERCO BMK 3.0 LN Natural Gas July 2011 - Manual (Page 62)

TROUBLESHOOTING
8
-
4
TABLE 8-1. BOILER TR
OUBLESHOOTING – Contin
ued
FAULT INDICATION
PROBABL
E CAU
SES
CORRECTI
VE ACTI
O
N
DELAYED
INTERL
OCK OPEN
1.
Delaye
d Interlock Jum
pe
r not
installe
d or re
moved.
2.
Device provin
g swit
ch ho
oked to
interloc
ks
is
not c
losed
1.
Che
ck for a jumpe
r pro
pe
rly installed a
cross the del
ayed
interloc
k terminals
in the I/O box.
2.
If there are 2
external wi
re
s on the
se terminals, che
ck to see if
an end
swit
ch
for a device
su
ch a
s a pu
mp, louver, etc. is tied
thes
e interlock
s.
Ens
ure that t
he device
and or its e
nd
switch
are fun
ctional
. (jumper m
ay be temporaril
y installed to test
interlock)
DI
REC
T
D
R
IVE
SIGNAL FAULT
1.
Dire
ct drive
si
gnal is n
ot prese
nt:
Not yet install
ed.
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).
3.
Control Box signal type sel
ection
swit
che
s not
set
fo
r c
or
re
ct
signal
type (voltage or cu
rrent).
1.
Che
ck I/O Box to ensure
si
gnal is h
oo
ke
d up.
Hoo
k up if no
t installed.
If installed, ch
eck pola
rity.
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. Ch
ec
k co
nt
rol sig
nal t
ype set
in
Config
uratio
n Menu.
FLAME LOS
S
DU
RI
N
G
IG
N
1.
Burne
r Groun
d Scre
w not i
nstalle
d
or loo
se.
2.
Wo
rn flame d
etector
3.
No spark fro
m
Spark Plug
4.
Defe
ctive Ignition Tran
sformer
5.
Defe
ctive Ignition/Stepper (IGST)
Board
6. Defe
ctive
SSOV
1.
Inspe
ct and i
nstall/retig
hte
n Burne
r Gro
und Scre
w.
2.
Remove and
ins
pec
t the flame detec
tor
for s
igns
of wear.
Repl
ace if nece
ssary.
3.
Clo
se the inte
rnal ga
s valve in
the boiler. Install and a
rc a
spa
rk
igniter out
sid
e the unit.
4.
If there is no
spa
rk,
che
ck
for 120VAC a
t the primary
side of the
ignition tran
sf
orme
r du
ring
the ignition cy
cle.
5.
If 120VAC is
not pres
ent, the
IGST Board in the Control Box
may be defective. Refer fault to
qualified servi
ce pe
rson
nel.
6.
While externa
lly arcing t
he spa
rk
ig
niter, observe
the
open/
clo
se in
dicato
r in the Safety Shut-Off Valve to e
nsu
re it is
openi
ng. If th
e valve does
not open, che
ck fo
r 120VA
C
at the
valve’s
input terminals
. If 120
VAC is
not pres
ent, the I
G
ST
board in the Control Box may be
defective. Refer fault to
qualified servi
ce
pe
rsonn
el.