Rapid 7500 136 Installation, operation & service manual - page 141
SECTION 19: T
ROUBLESHOOTING
129 of 143
19.2 Supply Fan
PROBLEM
POSSIBLE CAUSE
SOLUTION
Fan motor does not r
u
n
Damper limit s
w
itch not closed or inoperati
v
e.
Repair or replace s
w
itch.
Motor thermal o
v
er-loads tripped.
For tripped condition-reset.
F
u
ses
b
lo
w
n or missing.
Replace.
External po
w
er so
u
rce lacking.
Ha
v
e incoming po
w
er lines checked.
Motor inoperati
v
e.
Repair or replace.
Fan motor r
u
ns,
bu
t fans do
not s
u
pply eno
u
gh air
Belts
b
roken or loose.
Readj
u
st or replace.
Intake filters dirty.
Replace or clean.
O
b
str
u
ction in intake.
Check dampers for proper opera-
tion. Clear all intake passages of
o
b
str
u
ctions.
Fan
w
heel loose on shaft.
Reposition and tighten.
Access doors and panels not closed.
Close.
Excessi
v
e fan noise
Fan
b
earing
Replace.
Fan shea
v
e loose on shaft.
Tighten.
Belts not adj
u
sted.
Readj
u
st.
Fan propeller loose on shaft.
Reposition and retighten.
Fan propeller r
ubb
ing.
Loosen setscre
w
s. Reposition
w
heel
and tighten.
Fan propeller dirty.
Clean.
Foreign article in fan.
Remo
v
e.