Pre-Installation; Confirming The Afdh Package Can Be Properly; Installed; Installation Considerations For Unit-Mounted Afdh Drives - Trane AFDH 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 upgrade drive package.
Installation Considerations for Unit-
Mounted AFDH Drives
Important: Route Incoming Power Conduit to the Roof
of AFDH Cabinet! The air-cooled AFDH drive
is designed to have the incoming power
conduit routed vertically into the unit
through the removable conduit connection
cover located on the left-hand rear corner of
the cabinet roof. If the starter that is being
replaced by the AFDH drive has the
incoming power conduit routed
horizontally across the top of the starter, or
connected to the side or to the bottom of the
starter cabinet, an electrician will be
required to reconfigure the conduit and
wiring. Routing the incoming power
conduit into the AFDH cabinet anywhere
other than through the specified location on
the cabinet roof, will be considered an
unsupported field modification to the
cabinet design.
Upgrading direct mount starter with direct
mount AFDH drive
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 upgrade drive, the drive
package would be AFDH direct mount drive.
AFDH-SVN005B-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
The D-Frame AFDH unit-mounted upgrade drives are
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.
Important:
• NEC codes require that electrical disconnect switches
can be no higher than 72 inches above the surface of
the operator area floor or platform. Check the potential
mounted height of the AFDH disconnect switch,
especially if the chiller has large shells or is mounted
on structural steel.
• Other factors that affect the space required to
successfully install a remote AFDH drive include the
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