L.B. White I-5 Infraconic - Manual (Page 19)

19
Problem 3 Inner Combustion Cone 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
Plugged?
Allo
w 30 - 60
Seconds W
arm-Up
Bef
ore R
eleasing
Pilo
t Butt
on.
R
emo
v
e
the Com
ponent and
Clean It.
Ye
s
No
Ye
s
Ye
s
Ye
s
Is
Thermocouple
Def
ectiv
e?
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 Inner Cone t
o
Go Out. If
Thermocouple is W
eak, R
eplace it.
Is Saf
ety
Contr
ol V
alv
e
Def
ectiv
e?
Is Burner Orif
ice
Plugged?
R
emo
v
e
Orif
ice and Clean It.
Check Gas Pressure t
o
the
Heat
er Inlet with a Gas Gauge.
Pr
oper Pressure at High Heat
Should R
ead 5 PSIG. Lo
w Heat
is 1
0
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
P
ositioned Pr
operly
in Heat
er?
Thermocouple body t
o
be 5/8 in. abo
v
e
Heat
er’s Canop
y.
Ye
s
No
Is Butt
on
on Saf
ety Contr
ol
V
alv
e F
ully
Depressed?
Depress the Butt
on on the
Pilo
t Saf
ety V
alv
e until Gas
Flo
ws Thr
ough.
Ye
s
No
Check Dr
op-Out of Electr
omagnet in Saf
ety
Contr
ol 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 Saf
ety Contr
ol V
alv
e.
Ye
s
Is Pr
oper Gas
Pressure Supplied t
o
the Heat
er?
No