L.B. White I-5 Infraconic - Manual (Page 20)

Problem 4 Outer Combustion Cone Does Not Heat Up on High Thermostat Setting.
Is Pr
oper
Gas Pressure Being
Supplied t
o
the
Heat
er?
Check f
or Pr
oper Gas
Pressure t
o
the Heat
er
.
Pr
oper Pressure at High
Heat Should R
ead 5 PSIG.
Ye
s
No
Is Burner
Orif
ice Plugged?
R
emo
v
e
Orif
ice and
Clean It.
Ye
s
No
A
.
R
emo
v
e
Thermostatic Head fr
om
Thermostatic V
alv
e Body
. on Zone
Panel. If Out
er Cone Lights, R
eplace
Thermostatic Head and Sensor Assembly
.
-- OR --
B.
R
eplace Thermostatic Head
V
alv
e Body
.
Are There
Block
ages in
Gas Hose, Piping,
Tubing Assembly
, Inject
or
Body or V
enturi
Tube?
R
emo
v
e
the Com
ponent
and Clean It.
Ye
s
No
No
Problem 5 Heater Does Not Return Back to Low Heat.
Does
Main Burner Shut Of
f
When Thermostatic Head is
Set Belo
w R
oom
Te
m
perature?
R
emo
v
e
Thermostatic Head fr
om Modulating V
alv
e Assembly:
A
.
If Heat
er R
e
turns t
o
Lo
w Fire When y
ou Push Do
wn on Plunger Pin of V
alv
e,
R
eplace Thermostatic Head/Sensor Assembly
.
B.
If Heat
er Still Does No
t Cy
cle t
o
Lo
w Fire, the Modulating V
alv
e is Sticking and
Should be R
eplaced.
20