BAS-SVN032B-EN
5
General Information
About This Manual
The step-by-step instructions outlined in this manual describe the procedures required to
successfully retrofit a Trane TR1 variable frequency drive (VFD) on RTAC™ air-cooled chillers to a
Trane TR170 VFD. Drives are required for low and wide ambient operation. The Trane TR1 VFD
was originally installed for RTAC design sequences W0 through 1C. An affected RTAC will have
two, three, or four condenser fan drives. The number of drives will match the number of
compressors. For example, a three-compressor RTAC will have three condenser fan drives.
The installation instructions in this manual are divided into three general topic areas:
• Removal of existing TR1 VFD.
• Installation of replacement TR170 VFD.
• TR170 programming of parameters.
Follow start-up and troubleshooting procedures outlined in the service manuals of the unit and/
or the literature that is included with this TR170 control.
Tools Required
Very few tools are required to perform this installation. A service technician with a well-stocked
tool chest should have the right tools to perform the job.
Materials Required
Two TR170 drives are available. Select the correct drive replacement kit based on the existing
unit voltage as shown in the following table.
Table 1. Drive Selection
Unit Voltage Drive Part Number Drive Description
200/60/3
230/60/3
DRV03113 DRIVE; TR170 1.5HP 208VAC
380/60/3
400/50/3
460/60/3
575/60/3
DRV03114 DRIVE; TR170 1.5HP 460VAC
In addition to the drives, some field provided material will be required. A partial list of material is
provided here to help you plan ahead and to avoid material shortages at the job site.
• Wire, #16 AWG—Control wire will be required to make the connections between
components.
• Wire markers will be required to identify field wiring.
• Wire nuts and splicers may be required if splicing wires in the control panel.
• Cable ties help to “clean up” wiring runs.
• The blanket heater used with the Trane TR1 drive is sized incorrectly for use with a Trane
TR170 drive. The part number for the TR170 blanket heater is HTR16716.
• Four-compressor units and circuit 1 of three-compressor units use a single LLID relay to
enable both drives on a circuit. RTAC designs incorporating TR1 VFDs use a paralleled enable
signals to start the drives. This configuration is not applicable to the TR170 drives. An
additional relay with the following minimum specifications is required: 2 pole, normally open,
24-VDC contacts, and 120-VAC coil. Relay RLY00636 and socket BAS00154 are recommended.
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