7500-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
118 of 143
17.4 Manifold and Controls
17.5 Burner
17.6 Filters
17.7 Motor and Drive Components
Manifold
Periodically check f
u
el control assem
b
ly, and internal and external piping for
leaks. Relief
v
ent lines to o
u
tdoors on f
u
el controls sho
u
ld
b
e checked to
ens
u
re against
b
lockage ca
u
sed
b
y insects or any other s
ub
stance. Clean as
req
u
ired.
Air Flow Switch
An ann
u
al check of the t
ub
es attached to the air flo
w
s
w
itch sho
u
ld
b
e made
to ens
u
re against
b
lockage ca
u
sed
b
y insects or any other s
ub
stance. Clean
as req
u
ired.
Electric Components
Check to see there is no physical damage on any of the electric components
and
v
erify all electrical connections are sec
u
re. Ens
u
re eq
u
ipment is properly
gro
u
nded.
Temperature Sensors
Cali
b
rate room, o
u
tdoor air, and discharge air sensors as req
u
ired.
An ann
u
al inspection of the
bu
rner and components m
u
st
b
e made to ins
u
re
proper and safe operation. For the most part, the
bu
rner is self cleaning.
Ho
w
e
v
er, if the application is extremely dirty or d
u
sty, it may
b
ecome neces-
sary to periodically clean the
bu
rner. Refer to the
bu
rner man
u
fact
u
rer's litera-
t
u
re for g
u
idance.
Filters sho
u
ld
b
e checked for dirt restriction on a monthly
b
asis (or as
req
u
ired). Replace filters
w
ith filters of eq
u
al specification
w
hen they appear
dirty.
Gain access to the fan(s) and motor(s)
b
y remo
v
ing the inlet plen
u
m access
panel. First, release tension on the
b
elts
b
y adj
u
sting the motor
b
ase closer to
the
b
lo
w
er p
u
lley. Remo
v
e the
b
elts.
To remo
v
e the motor p
u
lley, first loosen the adj
u
stment set scre
w
s and co
u
nt
the n
u
m
b
er of t
u
rns to f
u
lly close the p
u
lley (this n
u
m
b
er
w
ill
b
e req
u
ired to re-
install the p
u
lleys to the pre
v
io
u
s adj
u
stment). Open the adj
u
sta
b
le shea
v
es
to gain access to the shaft set scre
w
s. Loosen the set scre
w
(s) that hold it to
the motor shaft and p
u
ll a
w
ay from the motor.
To remo
v
e the
b
lo
w
er p
u
lley, remo
v
e the
b
olts from the
bu
shing and insert into
the pre
v
io
u
sly
u
n
u
sed threaded holes of the
bu
shing. Caref
u
lly press the
b
lo
w
er p
u
lley off the
bu
shing, tightening the
b
olts e
v
enly. Loosen the Allen
Head setscre
w
(located on top of the key
w
ay) and slide the p
u
lley
bu
shing off
the shaft.
To remo
v
e the motor, first remo
v
e the motor p
u
lley as descri
b
ed a
b
o
v
e. Dis-
connect the motor po
w
er
w
iring and cond
u
it at the j
u
nction
b
ox in the side of
the motor. S
u
pport the motor so that it
w
ill
b
e sec
u
re
w
hen disconnected from
the adj
u
sta
b
le
b
ase. Remo
v
e the
b
olts that hold the motor to the adj
u
sta
b
le
b
ase. The motor may no
w
b
e remo
v
ed.
