Trane GRCA - Page 22

High
CFM Blower
belt(s) tension
can be
adjusted by
first loosening
motor
mounting plate
bolts marked
A
(See Figure
11). To tighten
belt tension,
turn belt ten-
sion adjustment
screws
marked
B (See Figure 11)
counter-clockwise.
To loosen
belt
tension, turn
clock-
wise.
Once belt tension
has been
adjusted, re-fasten
motor
mounting plate
bolts.
Blower
RPM
Adjustment
To adjust
blower RPM:
1.
Loosen
and remove
belt(s).
2.
Match driver
pulley to
one found in Figure
12.
3. Loosen
setscrew(s) marked
A.
4.
If driver pulley
is equipped
with external
key,
marked B, remove.
12
ure
13
5. Adjust driver pulley pitch
diameter for
desired
speed by opening (slower)
or closing (faster)
moving parts
by half or full turns.
Do not open
sheave
past point where flange
projects past the
hub end.
6. If driver pulley
is equipped with external
key,
marked
B, replace.
7. Tighten
setscrew(s) marked A.
8. Replace
and retension belt(s).
9. Realign drive if necessary.
B
B
11-4
A .,
KEY B PROJECTS
TO PROVIDE
A
GRIP
FOR
REMOVING.
DO NOT
OPERATE SHEAVE
WITH FLANGE PROJECTING
BEYOND THE HUB END.
SEE OEU0.
-
0-RETU
RN
D
4 4IP
O . S .
PLEN
UM I X
R
O
O F OPEN I NG
M ODEL D
E
10/15
74 . 0 0 0
3E . 000
( a go) (
a ea)
sa/ss/x
35.000
37.000
(
-
)
(9w)
30/35/60/70 46-000
45.00D
40/ 8 0/12
1
S I.90 0
33
.
5 00
( 13 0
E) (1 ^ J59 )
REF
.
ES)
^102'.
J
A-
x.1 25
R EF. ( 8 01N E NDS) •
(7
0 )
OC T AL A
D3B81
suppLy
1^000
1 ( 7 9)S
PL ^H U II
I.S.
20.875
(5
3
0)
4.E 9 REF .
ROOF
OP E
N
I NG
twice.
secnan/nooF
OPENING
oae^o
CAT S
1 7-94
_ 18 -