Pre-Installation; Confirming The Afdh Package Can Be Properly; Installed; Installation Considerations For Unit-Mounted Afdh Drives - Trane CVHE Installation Instructions Manual

Pre-Installation

Confirming the AFDH Package can
be Properly Installed
This chapter details potential interference fit problems,
mechanical incompatibility situations, electrical code
stipulations, and electrical conduit and wiring issues that
can prevent the successful installation and/or operation of
an AFDH retrofit drive package.
Installation Considerations for Unit-
Mounted AFDH Drives
Unit-mounted AFDH drives are incompatible
with direct-mount starters
Certain chillers larger than 800 tons in size that were built
after 2001, were equipped with direct-mount starters. A
direct-mount starter differs from a standard unit-mounted
starter in that it is bolted directly to the motor flanges and
the motor terminal board is flush with the back of the
starter panel box. Refer to
A direct-mount starter also lacks the Z-brackets and
transition cover that are an integral part of the standard
unit-mounted starter and which are also necessary for the
correct installation of a unit-mounted AFDH drive.
When a chiller that is equipped with a direct-mount starter
is being upgraded with an AFDH retrofit drive, the drive
package must either be a stand-mounted or a remote floor-
mounted version of the AFDH.
AFDH-SVN02D-EN
Figure 2.
Figure 2. Example of a direct-mount chiller starter
panel
1. Motor terminal access in left-center quadrant of cabinet. Motor
terminal access in an AFDH drive cabinet is located to the left in
the upper third portion of the cabinet.
2. Compressor motor terminal board. Flush to back of direct-mount
starter cabinet.
3. Hidden by direct-mount starter cabinet is the fact that there are
no Z-brackets available for mounting an AFDH drive.
Evaluate space available for rigging/installing
unit-mounted AFDH
All models of the E-Frame AFDH unit-mounted retrofit
drives are taller, wider, and deeper than the typical Wye
Delta unit-mounted starter they are intended to replace.
Accordingly any project should start with a careful
evaluation on whether there is ample enough space to rig
the AFDH into place and if any of the existing building
piping and conduit will not interfere with its mounting.
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