Watts AERCO Benchmark 2.0, Руководство пользователя

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TROUBLESHO
OTING
8
-9
TABLE 8-1. BOILER TRO
UBLESHOOTING – Contin
ued
FAULT INDI
CATION
PROBABL
E CAU
SES
CORRECTI
VE ACTI
O
N
(co
ntinue
d)
2.
Defe
ctive Flame Dete
cto
2. Repla
ce F
lame Dete
cto
r.
SSOV FAULT
DU
RIN
G
PU
RGE
See SSOV SWITCH OPEN
SSOV FAULT
D
U
R
ING RUN
1.
S
S
O
V
swit
ch
clo
sed f
or 1
5 se
con
ds
durin
g ru
n.
1.
Repl
ace SSOV actuator.
SSOV RELAY
FAILURE
1.
SSOV relay failed on b
oard.
1.
Ensu
re that
Neutral an
d Ea
rth Gro
und a
re con
ne
cted
at the
sou
rce and th
ere is n
o voltage mea
su
re
d betwe
en th
em.
Measurement
shoul
d indi
ca
te near
zero or no mo
re th
an a few
millivolts.
2.
Che
ck the SSOV powe
r wi
ring.
3.
Press CLEAR button an
d resta
rt unit. If fault persi
sts, replace
Ignition/Stepp
er (IGST
) Board.
SSOV
SWITCH OP
EN
1.
Actuator n
ot allowin
g for full clo
sure
of gas valve
2.
SSOV powe
red wh
en it sh
ould not
be
3.
Defe
ctive Switch or Actu
ator
4.
Inc
orr
ec
tly w
ired sw
itch.
1.
Observe op
eration of the Safe
ty Shut-Off Valve (SSOV) throug
h
indicator on t
he Valve actu
ator and e
nsu
re that the valve is fully
and not pa
rtia
lly closin
g.
2.
If the SSOV n
ever clo
se
s, it may be powered
contin
uo
usly.
Clo
se the ga
s supply an
d remove po
we
r from the unit. Refer
fault to qualified se
rvice p
er
so
nnel.
3.
Remove the
electri
cal
cov
er from the S
S
OV and ch
eck
swit
ch
contin
uity. If the switch d
oe
s not
sh
ow
co
ntinuity with the ga
s
valve closed, either adj
ust
or re
pla
ce the
switch or a
ct
uator.
4.
Ensu
re that the SSOV Pro
of of Closu
re
swit
ch is
correctly wire
d.
STEPPER MOTOR
FAILURE
1.
Air/Fuel Valve out of calibration.
2.
Air/Fuel Valve unplu
gged.
3.
Loo
se wi
ring
con
ne
ction to
the
stepp
er moto
r.
4.
Defe
ctive Air/Fuel Valve st
eppe
r
motor.
5.
Defe
ctive Power Su
pply Board o
r
fus
e
6.
Defe
ctive IGST Board
1.
Refer to GF
-1
12 and p
erfo
rm Stepper Te
st (pa
ra. 6.3.5) to
ensure
stepp
er moto
r rotat
es prope
rly b
etwee
n the 0
%
(fully
clo
sed
) and 1
00% (fully op
en) po
si
tion
s.
Verify that th
e FIRE
RATE bargra
ph and the di
al on t
he Air/Fuel Valve track ea
ch
other to indi
cate prop
er o
pe
ra
tion. If operation is
not correc
t,
perfo
rm the Stepper F
eed
ba
ck Cali
bratio
n (GF
-11
2, para. 6.2.1).
2.
Che
ck that the Air/Fuel Val
ve is con
ne
cted to the Con
trol Box.
3.
.Inspe
ct for lo
ose
con
ne
ctions b
etwe
en
the Air/Fuel Valve motor
and the wi
rin
g harn
ess.
4.
Repl
ace step
per moto
r.
5.
Che
ck DS1 &
DS2 LEDs o
n Powe
r Sup
ply Board. If they are not
steady O
N
, repla
ce Power Supply Board.
6.
Che
ck “Hea
rtbeat” LE
D DS1 and verify it is blinkin
g ON & OFF
every se
con
d.
If not, replace IGST Board
.