Trane AFDH, Installation Manual

Page: 13 / 68

AFDH-SVN01A-EN 13
Pre-Installation
Evaluate space available for rigging/installing unit-mounted AFDH
All models of the D-Frame and 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.
NOTICE:
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.
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.
Important: Other factors that affect the space required to successfully install a stand-mounted
AFDH drive include the clearance distances specified by the local electrical codes.
Typical code regulations require an average of 36-inches clearance from the panel
to nonconducting surfaces and 47-inches to a conducting surface. Check and confirm
that when installed, the drive clearances will conform to all local codes. Do not forget
to account for cabinet door swing clearances.
Note: Refer to manual section “AFDH Drive Package Specifications,” p. 22 for the dimensions and
weights of all models of AFDH drives”
Figure 3. Comparison of unit-mounted AFDH to typical unit-mounted starter.
1. Typical Wye Delta unit-mounted starter (60
in. tall x 38 in. wide x 14 in. deep)
2. Unit-mounted D-Frame AFDH
superimposed over the outline of the unit-
mounted starter
3. Unit-mounted E-Frame AFDH
superimposed over the outline of the unit
mounted starter
4. Ensure sufficient overhead clearance space
is available for drive installation
5. Electrical disconnect switch for drive unit.
Note: Center of switch assembly is 24-
inches above the base of the cabinet. Refer
to
Figure 8, p. 22 for D-Frame cabinets and
Figure 10, p. 24 for E-Frame cabinets