Trane RTAC 140-500 ton units (60 Hz) User Manual

Page of 252
RTAC-SVX01F-EN
139
Pre-Start Checkout
If alarm and status relay outputs are used, install leads from the panel to the 
proper terminals on circuit board.
If the emergency stop function is used, install low voltage leads to terminals on 
circuit board.
Connect separate power for the External Emergency Stop option, if applicable.
If the ice making-option is used, install leads on 5K18 to the proper terminals on 
1U7.
Connect separate power supply for ice making status circuit, if applicable.
General
When installation is complete, but prior to putting the unit into service, the following 
pre-start procedures must be reviewed and verified correct:
 WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote disconnects before 
servicing. Follow proper lockout/tagout procedures to ensure the power 
cannot be inadvertently energized. For variable frequency drives or other 
energy storing components provided by Trane or others, refer to the 
appropriate manufacturer’s literature for allowable waiting periods for 
discharge of capacitors. Verify with an appropriate voltmeter that all 
capacitors have discharged. Failure to disconnect power and discharge 
capacitors before servicing could result in death or serious injury.
Note: For additional information regarding the safe discharge of 
capacitors, see PROD-SVB06A-EN or PROD-SVB06A-FR 
1.
Inspect all wiring connections in the compressor power circuits (disconnects, ter-
minal block, contactors, compressor junction box terminals, etc.). to be sure they 
are clean and tight.
CAUTION
Connections!
Verify all connections are made. Loose connections can cause 
overheating and undervoltage conditions at the compressor motor.
2.
Open all refrigerant valves in the discharge, liquid, suction, oil and oil return lines.
CAUTION
Compressor Damage!
Catastrophic damage to the compressor will occur if the oil line shut off 
valve or the isolation valves are left closed on unit start-up.
3.
Check the power supply voltage to the unit at the main power fused-disconnect 
switch. Voltage must be within the voltage utilization range and also stamped on 
the unit nameplate. Voltage imbalance must not exceed 3%. 
4.
Check the unit power phasing L1-L2-L3 in the starter to be sure that it has been 
installed in an “ABC” phase sequence.