Installation
30 AFDH-SVN03H-EN
1. Inspect the Z-bracket on the chiller motor flange. If the
Z-bracket is equipped with weldment nuts, these nuts
must either be ground off or drilled out to allow the
3/8-inch studs on the back of the new drive cabinet
assembly to slide into the bracket at these locations.
2. Prepare lifting equipment and rigging.
a. Depending upon the model type, a unit-mounted
AFDH
can weigh up to 1400 pounds. Confirm the
weight of the AFDH unit to be installed. For D-Frame
units refer to Table 5, p. 17.
b. Verify that the intended lifting device and rigging
has the capacity to safely handle the load before
hooking up to the two factory provided lifting points
on top of the cabinet assembly.
c. Use the appropriate rigging techniques to ensure
that the cabinet assembly will be balanced about its
center of gravity during lifting. Refer to
“Recommended Rigging and Lifting Procedures for
AFDH Drive Units,” p. 14.
3. Using safe lifting practices, carefully lift the cabinet and
position
it over the brackets on the evaporator.
a. Bolt the angle iron clips removed from the old
starter
to the slots on the bottom of the drive
4. Slowly lower the cabinet until the clips make contact
with
the evaporator brackets but do not place the full
weight of the cabinet onto the brackets at this time.
Keep tension on the lift rigging to support the weight of
the cabinet.
a. Adjust the angle iron clips as necessary at the base
of
the cabinet until the back of the cabinet is level
and lined up against the Z-bracket, then attach the
cabinet to the bracket using the kit hardware
provided.
b. Secure the angle iron clips to the evaporator
brackets with the bolts previously used to secure
the old starter panel to them.
c. Ensure that all nuts are properly tightened at all
cabinet mounting points.
5. Confirm that the drive is firmly attached to all brackets
and
is stable before slowly lowering the lifting device
to slacken the rigging and remove it from the lifting
points.
NOTICE:
Improper Unit Lowering!
Do not drop the drive cabinet assembly onto the
evaporator mounting brackets when setting it into
position! Dropping the cabinet onto the brackets could
result in damage to the drive cabinet, the brackets,
and/or the evaporator shell.
Figure 24. Removal of Z-bracket weldment nuts
1. Z-bracket
2. Weldment nuts (4 total on bracket, only 2 shown) drill out or
grind off flush.
Figure 25. Position cabinet base over evaporator
brackets and install clips
1. Lining up slots in drive cabinet base with slots in evaporator
brackets.
2. Bolt an angle iron clip (that was removed from the old unit-mount
starter) to each slot in the cabinet base.
3. Lower drive unit until clips come in contact with bracket surface.
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