Thermo King 098203, Maintenance Manual

Page: 163 / 264

Electrical Maintenance
161
Reversing Power Phase on MAGNUM Units
Use the incoming power cable leads to reverse the power phase. This is recommended on MAGNUM
units because the Jumper J18 does not reverse power to the scroll compressor. This protects against the
possibility that the compressor will be out of phase with the condenser and evaporator fans when the unit
is plugged into a new power supply.
To reverse the Power Phase Complete complete the following steps:
1. Turn the unit 460/380V main circuit breaker off.
2. Disconnect unit power cord from power supply.
3. Relocate the position of the white and black incoming power cord leads at the 460/380V main circuit
breaker.
4. Connect unit power cord to proper power supply.
5. Start the unit again by turning the unit 460/380V main circuit breaker on and the Unit turned On and
allow Unit to start and stabilize.
6. Check condenser airflow again to confirm correct fan rotation.
Evaporator Heater Selection
Magnum Plus units are being built with different length and wattage heaters. Use the following
information to determine what heater to use for replacement.
• Heater short 680 Watts (Normal) 45-1927
• Heater Long 1360 Watts (Normal) 45-2441
• Heater Long 2000 Watts (Extended) 45-2451 (OOCL)
WARNING: The unit will automatically
start and operate if 460/380V power is
present at the main power module when
the controller is disconnected. To prevent
personal injury from rotating machinery
or dangerous electrical shock from high
voltage controls, disconnect the supply
power to the unit before preparing the unit
for manual emergency mode operation.
Figure 137: Six Short Length Heaters
(680 Watts Each)
Figure 138: Three Longer Heaters
(1360 or 2000 Watts Each)