AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 70)

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
(c
ontinued)
3.
Def
e
c
tive High G
a
s
Pr
es
s
u
re
Sw
itc
h
4.
G
as
pr
es
s
ur
e s
nubber
not ins
talled.
5.
F
luc
tuating s
upply
gas
pr
es
s
ur
e.
3.
Rem
ove the leads
f
rom
the high gas
pr
es
s
ur
e s
w
itc
h and
m
eas
ur
e c
ontinuity
ac
ros
s
the c
om
m
on and nor
m
ally
c
los
ed
ter
m
inals
w
ith the unit not f
ir
ing. Replac
e the s
w
itc
h if
it does
not
s
how
c
ontinuity
.
4.
See F
igur
e 8-
1. Ens
ur
e that the gas
pr
es
s
ur
e s
nubber
is
ins
talled
at the high gas
pr
es
s
ur
e s
w
itc
h.
5.
Meas
ur
e gas
pr
es
s
ur
e ups
tr
eam
of
SSO
V and m
onitor
f
or
s
udden c
hanges
(
s
ee F
ig. 8-
1)
.
HIGH W
A
T
E
R T
E
MP
SW
IT
CH O
PEN
1.
F
aulty
W
ater
tem
per
atur
e s
w
itc
h.
2.
Inc
o
rrec
t PID s
e
ttings
.
3.
F
aulty
s
hell tem
per
atur
e s
ens
or
.
4.
Unit in Manual m
ode
5.
Unit s
etpoint is
gr
eater
than O
v
er
T
em
per
atur
e Sw
itc
h s
etpoint.
6.
Boiler
Managem
ent Sy
s
tem
PID or
other
s
ettings
not c
or
rec
tly
s
etup.
7.
No interloc
k
to boiler or BMS to
dis
able boiler
(s
) in event that s
y
s
tem
pum
ps
have f
ailed.
8.
Sy
s
tem
f
low
r
ate c
hanges
ar
e
oc
c
ur
ri
ng f
as
ter
than boiler
s
c
an
res
pond.
1.
T
es
t the tem
per
atur
e s
w
itc
h to ins
ur
e it tr
ips
at its
ac
tual w
ater
tem
per
atur
e s
etting.
2.
Chec
k
PID s
ettings
agains
t Menu Def
ault s
ettings
in the
Appendix
. If
the s
ettings
have been c
hanged, r
ec
or
d the c
ur
rent
readings
then r
es
et them
to the def
ault values
.
3.
Us
ing the r
es
is
tanc
e c
har
ts
in the Appendix
C, Meas
ur
e the
res
is
tanc
e of
Shell s
ens
or
and BT
U s
ens
or
at a k
now
n w
ater
tem
per
atur
e.
4.
If
unit is
in Manual Mode s
w
itc
h to Auto Mode.
5.
Chec
k
s
etpoint of
unit and s
etpoint of
T
em
per
atur
e Sw
itc
h;
Ens
ur
e that the tem
per
atur
e s
w
itc
h is
s
et higher
than the unit’s
s
etpoint.
6.
Chec
k
the BMS f
or
c
hanges
to PID def
ault values
, c
or
rec
t as
nec
es
s
ar
y
.
7.
If
s
y
s
tem
pum
p is
c
ontr
olled by
Ener
gy
Managem
ent Sy
s
tem
other
than BMS or
pum
ps
ar
e individually
c
ontr
o
lled by
boiler
,
c
hec
k
to s
ee if
ther
e ar
e f
low
s
w
itc
hes
inter
loc
k
ed to the BMS or
boiler
.
8.
If
the s
y
s
tem
is
a var
iable f
low
s
y
s
tem
, m
onitor
s
y
s
tem
f
low
c
hanges
to ens
ur
e that the r
ate of
f
low
c
hange is
not f
as
ter
than
w
hat the boiler
s
c
an r
es
pond to.
HIGH W
A
T
E
R
T
E
MPERAT
URE
1.
See HIGH W
A
T
E
R T
E
MPERAT
URE
SW
IT
CH O
PEN.
2.
T
em
p HI Lim
it s
etting is
too low
.
1.
See HIG
H
W
A
T
E
R T
E
MPERAT
URE SW
IT
CH O
PEN.
2.
Chec
k
T
e
m
p
HI Lim
it s
e
tting.
IGN BOARD
COMM FAULT
1.
Com
m
unic
ation f
ault has
oc
c
ur
red
betw
een the PMC boar
d and
Ignition/Stepper
(
IG
S
T
) boar
d
1.
Pr
es
s
CLEAR button and r
es
tar
t unit. If
f
ault per
s
is
ts
, c
ontac
t
qualif
ied Ser
v
ic
e Per
s
onnel.
8
-
6