Watts AERCO Benchmark 2.0, User Manual

Page: 59 / 97

TROUBLESHO
OTING
8
-3
TABLE 8-1. BOILER TR
OUBLESHOOTING – Contin
ued
FAULT INDI
CATION
PROBABL
E CAU
SES
CORRECTI
VE ACTI
O
N
DELAYED
INTERLOCK 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
ay
ed
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 (i.e. a pump, louver, etc.) i
s tied to
these inte
rlo
cks. En
sure that
the device
and its en
d switch a
re
function
al. (ju
m
per may be
temporarily in
stalled to test
interlock
DIREC
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 for corre
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
na
l level.
Che
ck co
ntin
uity of wiring
betwe
en source an
d boile
r.
2.
Che
ck sig
nal
at source to e
nsu
re it is isol
ated.
3.
Check
DIP switc
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.
FLAME LOS
S
DU
RIN
G
IGN
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. Defec
tive
SSOV
7.
Defe
ctive Differential Pressure
Reg
ulator.
8.
Carbon o
r oth
er deb
ris on
Burne
r.
1.
Inspe
ct and i
nstall/retig
hte
n Burne
r Gro
und Scre
w.
2.
Remove a
nd
insp
ect the flame dete
ctor
for sign
s 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
ignitor out
sid
e the unit.
4.
If there is no
spa
rk,
che
ck
for 120VAC a
t the primary
side to the
ignition tran
sf
orme
r du
ring
the ignition cy
cle.
5.
If 120VAC is not pre
sent, the
IGST Board in the Control Box
may be defective. Refer fault to qualified servi
ce pe
rson
nel.
6.
While externa
lly arcing the
spa
rk ig
nitor,
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
valves input termin
als. If 120VAC is n
ot pre
sent, the IGST
board in the Control Box may be defective. Refer fault to qualified servi
ce
pe
rsonn
el.
7.
Che
ck ga
s pressure usi
ng
gaug
e or ma
nomete
r into and out of
the Air/Fuel Valve to ensu
re gas i
s getting to burn
er.
8.
Remove b
urn
er and in
sp
ect for any carb
on or de
bri
s. Clea
n
and rei
nstall