L.B. White I-34 Infraconic Pilot Ignition - Manual (Page 22)

22
Problem 2 Pilot Lights, but will not Stay Lit
Did y
ou
Allo
w Suf
ficient Time
for the Thermocouple
to
W
arm Up?
Is
the Gas Hose or
Pilo
t Line Par
tially
Plugged?
Allo
w 30 - 60
Seconds W
arm-Up
Bef
ore R
eleasing
Pilo
t Butt
on.
R
emo
v
e
the Com
ponents and
Clean with Com
pressed Air
.
Ye
s
No
Ye
s
Ye
s
Ye
s
Is
Thermocouple
Def
ectiv
e?
A
.
Check Thermofuse in Thermocouple for Continuity
. If Thermofuse is
Open, R
eplace Thermocouple.
B.
If Thermofuse is Good, Check Milliv
olt Output of Thermocouple
with Milliv
olt T
est Kit. Output Should
be at Least 4 m
v
D.C. A R
eading of
Less than 4 m
v
D.C. can Cause Pilo
t
Flame or Inner Cone Dr
op-Out. If
Thermocouple is W
eak, R
eplace it.
Is Pilo
t Saf
ety
Contr
ol V
alv
e
Def
ectiv
e?
Are Pilo
t
Screen or Pilo
t
Orif
ice Plugged?
Check Gas Pressure t
o
the
Heat
er Inlet with a Gas
Gauge. Pr
oper Pressure at
High Fire - 5 PSIG.
Pilo
t Pressure - 20 in. W
.C.
No
No
No
Is Thermo-
couple Contact N
u
t
Tight
ened Securely int
o
Gas Contr
ol
V
alv
e?
Snug Contact N
ut in
Place. (Do No
t
Ov
er
tight
en.) Check f
o
r
Debris Betw
een Contact
of Thermocouple and
Electr
omagnet of V
alv
e. Ye
s
No
Is
Thermocouple Tip P
ositioned Pr
operly
int
o Flame?
P
osition Edge of
Thermocouple t
o
be
1/2 - 9/1
6 in. abo
v
e
Br
ooder Housing.
Ye
s
No
Check Dr
op-Out of Electr
omagnet in Pilo
t
V
alv
e with the Milliv
olt T
est Kit. The V
alv
e
Magnet Should Dr
op Out at 2.0 m
v
D.C. If
the Magnet Dr
ops Out abo
v
e
2.0 m
v
D.C.,
R
eplace the Pilo
t V
alv
e.
Ye
s
Is Pr
oper Gas
Pressure Supplied t
o
the Heat
er?
No
Use InstaClear™ Clean-Out or Clean Pilo
t Orif
ice and Pilo
t
Screen with Air
.