L.B. White I-17 Infraconic - Manual (Page 22)

22
Problem 3 Heater 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
par
tially
plugged?
Allo
w 30 - 60
seconds w
arm-up
bef
ore releasing
butt
on. R
emo
v
e
the com
ponent and
clean It.
Ye
s
No
Ye
s
Ye
s
Ye
s
Is
thermocouple
aut
o reset switch
open.?
Ensure the heat
er has been pr
operly
cleaned. R
e
fer t
o
Cleaning Instructions
within this manual. If the heat
er has been cleaned, t
est the
thermocouple f
or continuity
.
-- Connect an ohm met
er betw
een
the thermocouple contact nut and its tip.
-- An ohm reading of less than
1 ohm is acceptable.
-- A reading sho
wing o
v
erload or
inf
init
e resistance indicat
es an
open aut
o reset switch.
-- If open, allo
w the thermocouple
to
cool f
or 5 minut
es. R
e
test the
thermocouple. If the reading is no
t
1 ohm or less, replace the
thermocouple.
Is saf
ety
contr
ol v
alv
e
def
ectiv
e?
Is primar
y 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 be 5 PSIG. Lo
w heat is
1
0
in. W
.C.
No
No
No
Is thermo-
couple contact nut
tight
ened securely int
o
saf
ety contr
ol
v
alv
e?
Snug contact nut in
place. (Do no
t
o
v
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
positioned pr
operly ?
P
osition edge of
thermocouple t
o
be
1/2 - 9/1
6 in. abo
v
e
heat
er’s housing.
Ye
s
No
Is butt
on
on saf
ety contr
ol v
alv
e
fully depressed?
Depress the butt
on on the
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.,
replace the saf
ety contr
ol v
alv
e.
Ye
s
Is pr
oper gas
pressure supplied t
o
the heat
er?
No