25
®
V
A
L
V
E PRO
VE TE
ST
BE
GIN
S
*
TH
IS CH
AR
T
RE
FL
ECTS
O
P
ER
A
T
IO
N
WITH
O
P
T
ION
P
A
R
A
MET
ER
4
.0
SE
T
TO
8
O
R
1
0
.
RE
FER T
O
T
ABL
EL 2 FOR OPE
RA
T
IONAL SEQUE
NCE
WIT
H V
A
LV
E PROV
ING SE
QUENCE
ENABLED.
**
*POST
PU
RG
E TIM
ING
SE
T IN O
P
TIO
N P
A
RAM
ENT
E
R
4
.3
T
a
ble 1: S
tart-up Sequence*
1. Burner
of
f
2.
Wa
it
for
purge
3.
Open
fuel
va
lve
4.
Hold
fu
el
va
lve
5.
Prove
closed
posi-
tion
s
6.
Prove
ai
r
pr
es-
su
re
7.
Prove
pu
rg
e
po
si
-
tions
8.
Pre
-
pu
rg
e
9.
M
o
ve
to
igni-
ti
on
po
si-
ti
ons
10.
Pr
e-
igni-
tion
11.
Pil
o
t
igni-
ti
on
12.
Pi
lot
igni-
tion
in
ter
-
va
l
1
3.
Ma
in
igni-
tion
14
.
Wa
it
for
fl
am
e
establ.
15
.
Mo
ve
to low
fire
16.
Mo
du-
la
te
17.
Move
to
Po
st
-
Pu
rg
e
18.
Po
st
-
Pu
rg
e
**
Bu
rn
er
Se
lect
Air
Flow
Sw
itc
h(
s)
Fla
me Det
ec
t
Main V
alve
#1
Main V
alve
#2
Pilot V
alv
e
Ve
n
t Va
lv
e
Fan
Mo
to
r
Ignition
Tr
ansf
ormer
t1
t2
t3
t4
t5
t6
t7
Po
st
-
purge
ti
me
