Trane LPC Install And Operation Instructions page 103

Instructions for Changing Out Spring
Isolators on LPC
Unit Sizes 3 through 10:
Units ranging in size from 3 to 10 use a 1"
defelection isolator assembly like the one
shown in the figure below. Lateral
movement is limited by the snubber bolt.
The spring is supported at the bottom by
the isolator bracket, but the two are not
mechanically attached to one another.
To change out the spring in this type of
assembly perform the following steps:
1. Disconnect power to the unit.
2. Loosen the lock nuts on the snubber
bolts for all four corners. Remove the
lock nut the spring that needs to be
removed.
3. Elevate the isolation base so that the
weight of the fan and mtor is
removed from the spring. The picture
shown below is of an unloaded spring
with the isolation base held up by
blocks.
4. Loosen the flange nut at the base of
the snubber bolt from rotating while
loosening the flange nut.
5. Remove the nuts that were cinched
together in the step above. As the
flange nit is being loosened, the
snubber bolt should drop down inside
the isolator bracket.
Figure M-MP-2. One-inch Deflection Isolator Assembly
LPC-SVX01C-EN
Maintenance
6. Push the snubber bolt down though
the isolation base into the isolation
bracket as far as it will go. This should
allow some space between the end
of the snubber bolt and the isolation
base.
7. Remove old spring and replace with
new one.
8. Tighten flange nut until snubber bolt
is back to its original position. The nuts
that were cinched together in step 3
may be needed again to prevent the
bolt from rotating while the flange nut
is being tightened.
9. Replace washers and lock nut.
10. Remove blacoks holding up the
isolation base and tighten all lock nuts
to their original postion so that
isolation assembly is level.
maintenance
procedures
Unit Sizes 12 through 30:
Units ranging in size from 12 to 30 use a
2" deflection isolator assembly like the
one shown in the picture below. Lateral
movement is limited by snubber brackets
(not shown). The spring is supported at
the bottom by the isolator bracket, but the
two are not mechanically attached toone
another. Another identical isolator bracket
is inverted and is located above the
spring. An adjustment bolt runs thro9ugh
theh top bracket and pushed against athe
sping cap resting on the top of the spring.
To change out the spring in this tupe of
assembly perform the following steps:
1. Disconnect power from the unit
2. Loosen and remove the adjustment
bolt
3. Remove the sping cap and spring
4. In some cases there is not enough
clearance between the top isolator
bracket andthe cabinet to allow the
spring mounting screws. Be sure the
isolation base is secured or elevated
with blocks before removing the top
bracket
5. Replace old spring with a new one
and also replace the spring cap
6. Reattch top isolator bracket if
removed in step 3
7. Return adjustment bolt to its original
position so that the isolation base
assembly is level
I s o l a t i o n
B a s e
B r a c k e t
M o u n t i n g
S c r e w s
S h i p p i n g
T i e - d o w n
S p r i n g
Figure M-MP-3. Two-inch Deflection Isolator Assembly
A d j u s t m e n t B o l t
T o p I s o l a t o r
B r a c k e t
B o t t o m
I s o l a t o r
B r a c k e t
103