L.B. White 100 Tradesman Portable Forced Air - Manual (Page 19)

Ye
s
Ye
s
Problem 4 H
ea
te
r
Li
gh
ts
BB
ut
D
oe
s N
N
ot
S
ta
y L
Li
t.
Is pr
oper gas
pressure supplied t
o
the heat
er?
Is the
thermocouple
contact nut tight at
the gas contr
ol
valv
e?
Pr
ovide pr
oper
gas pressure. (See dataplat
e.)
Check f
or dir
t betw
een contact
butt
on of thermocouple and
valv
e. Blo
w out if necessar
y.
Snug the contact nut in place
with a wrench.
Ye
s
No
Ye
s
Ye
s
Ye
s
Is
thermocouple tip Pr
operly
positioned?
Tip should be exposed 1/2 in.
fr
om burner
plat
e.
A.
Im
pr
oper Ignit
er Gap.
Gap t
o 3.6 mm (.
142”)
B.
Def
ectiv
e Ignit
er wire.
(Check f
or Continuity
.)
C.
Def
ectiv
e Ignit
er
.
D.
Def
ectiv
e Ignition Contr
ol.
K
eep butt
on
depressed t
o allo
w
pr
oper w
arm up.
Does ignit
er
continually
spark?
Is contr
ol
valv
e butt
on fully
depressed?
Fully depress the contr
ol butt
on.
No
No
No
No
No
Are
backflash switch contacts closed?. (P
er
form continuity
check
.)
Det
ermine Cause of
Backflash Switch
Opening.
(See Pr
oblem 5.)
No
Ha
ve
individual
wires been check
ed
for continuity fr
om
thermocouple energy
cut-Of
f t
o rela
y.
?
Check wires f
or
continuity
.
No
Has
thermocouple
milliv
olt strength
been check
ed with
multimet
er?
Set Multimet
er t
o D.C. V
olts.
Apply Pr
obes t
o T
erminal on
Energy Cut Of
f Block and
copper out
er jack
et of
thermocouple. R
eadings of 1
0
D.C. Milliv
olts and A
bo
ve are
Acceptable. R
eplace
thermocouple if reading is
under 1
0
M.V
.
Ye
s
No
Has
dr
op out
of pilo
t contr
ol
magnet Been check
ed with
multimet
er?
Follo
w Same Pr
ocedure f
or
checking thermocouple. Close gas supply v
alv
e t
o
Heat
er
. When contr
ol v
alv
e
magnet releases, reading should be 5 Milliv
olt D.C. or
Lo
w
er
. If contr
ol v
alv
e
magnet releases abo
ve
5
milliv
olt D.C., replace contr
ol v
alv
e.
Ye
s
No
Is rela
y
receiving pr
oper
voltage? (See
dataplat
e)
Check wiring t
o
rela
y f
or Continuity
.
R
epair or replace.
R
ela
y
contacts Do no
t close.
R
eplace rela
y.
Ye
s
Did
you allo
w
suf
ficient time f
or the
thermocouple t
o w
arm
up (30-60 Seconds)
bef
ore releasing butt
on?
No
18
Ye
s
Ye
s
Problem 5 B
ac
kf
la
sh
S
w
itc
h i
is
O
pe
n.
Is
pr
oper gas
pressure supplied t
o
heat
er? (See
dataplat
e)
Is f
an blade
set scre
w tight
ened
to
mo
tor shaf
t?
Pr
ovide pr
oper
gas pressure t
o
the heat
er
.
Tight
en the set scre
w
.
Ye
s
No
Ye
s
Ye
s
Is heat
er receiving pr
oper
ventilation?
Increase r
oom
ventilation or reposition
heat
er t
o a
void
recir
culation of ho
t air
.
Bend switch
mounting brack
et
aw
ay
fr
om burner
plat
e until
1/4 in. gap is established.
Supply pr
oper
voltage. Contact
qualif
ied
electrician if necessar
y.
Is f
an blade
reasonably
clean?
Clean the f
an blade.
No
No
No
Ye
s
Ye
s
Is backflash
switch pr
operly
positioned?
No
Ye
s
Is
pr
oper
voltage supplied
to
fan mo
tor?
(See dataplat
e)
No
Def
ectiv
e backflash switch. Replace the switch.