AFDH-SVN01A-EN 12
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 Figure 2.
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.
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
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