Rapid 7500 136 Installation, operation & service manual - page 145
SECTION 19: T
ROUBLESHOOTING
133 of 143
Oil Operation (continued)
PROBLEM
POSSIBLE CAUSE
SOLUTION
Oil Flame Ignites,
bu
t then
Flame Safeg
u
ard Control
Locks O
u
t on Safety.
Flame scanner lens dirty.
Remo
v
e and clean.
Scanner sight t
ub
e
b
locked or dirty.
Check and clean.
Flame scanner defecti
v
e. Replace.
Defecti
v
e oil nozzle ca
u
sing
u
nsta
b
le flame and
scanning pro
b
lems.
Replace oil nozzle.
F
u
el/air ratios incorrect, res
u
lting in
u
nsta
b
le or
smoky flame ca
u
sing scanner flame sighting pro
b
-
lem.
Readj
u
st ratios for clean sta
b
le
flame.
Defecti
v
e flame safeg
u
ard amplifier or control.
Replace as appropriate.
Oil Flame Extremely
Smoky at Light Off or in
Lo
w
Fire Position.
Defecti
v
e or incorrect size oil nozzle.
Replace.
F
u
el/air ratio incorrect.
Readj
u
st.
Normally closed oil solenoid
v
al
v
e in oil nozzle
ret
u
rn line not opening.
Check electrical circ
u
itry and
replace
v
al
v
e if defecti
v
e.
On t
w
o-step p
u
mp - Normally open p
u
mp mo
u
nted
solenoid
v
al
v
e malf
u
nctioning.
Replace
v
al
v
e or p
u
mp.
Light off Oil Flame Is
Esta
b
lished and Pro
v
en,
bu
t B
u
rner Will Not
Attempt to go to the High
Fire Position
Lo
w
/High/Lo
w
or Mod
u
lating
bu
rner high fire tem-
perat
u
re or press
u
re control co
u
ld
b
e defecti
v
e or
not set to call for high fire.
Readj
u
st or replace control.
Loose
w
ires. Verify
w
iring and tighten all connec-
tions.
Flame safeg
u
ard control or high fire panel s
w
itching
relay (if s
u
pplied) defecti
v
e.
Verify and correct as req
u
ired.
High fire 3
w
ay solenoid
v
al
v
e defecti
v
e. Replace.
Hydra
u
lic oil cylinder defecti
v
e. Replace.
On t
w
o-step p
u
mp - Normally open solenoid
v
al
v
e
defecti
v
e (not closing).
Replace p
u
mp or
v
al
v
e.
Linkage mechanically
b
inding. Readj
u
st linkage.
On mod
u
lating system
defecti
v
e mod
u
lating motor.
Replace.
Lo
w
Oil Flame Is
Esta
b
lished and Pro
v
en,
bu
t Flame O
u
t Occ
u
rs in
Transition from Lo
w
Fire to
High Fire
On Lo
w
/High/Off or Lo
w
/High/Lo
w
system - Nor-
mally closed oil solenoid
v
al
v
e in nozzle ret
u
rn line
not closing (or leaking).
Check
v
al
v
e operation and replace if
necessary.
On t
w
o-step oil p
u
mp - Normally open solenoid
v
al
v
e defecti
v
e (not closing).
Replace
v
al
v
e or p
u
mp.
Defecti
v
e oil nozzle.
Replace.
High fire oil press
u
re too lo
w
. Readj
u
st.
Air dampers set too far open at lo
w
fire,
w
hich
ca
u
ses flame to
b
lo
w
o
u
t in starting to high fire.
Readj
u
st dampers.
Oil p
u
mp co
u
pling loose or defecti
v
e. Tighten
or
replace.
Defecti
v
e oil p
u
mp. Replace.
Linkage mechanically
b
inding.
Readj
u
st.
Make certain the #72 orifice into the normally
closed side of the 3
w
ay
v
al
v
e has not
b
een
remo
v
ed.
On mod
u
lating systems - f
u
el/air ratios set incor-
rectly, ca
u
sing flame to
b
lo
w
o
u
t
w
hen going to high
fire.
Readj
u
st linkage.