OD460 - Condenser Fan Motor Wiring

Overview

On some OD460 refrigeration units manufactured during November and December 2015, the condenser fan motor wiring may differ from the wiring diagram label attached to the front kick panel. If wired differently (as shown in Fig. 2 below), the condenser fan motor will still operate as normal. A service call is not required to check and change the wiring to match the label. If the condenser fan motor wiring difference is discovered during an unrelated service call, we recommend changing the wiring to match the wiring diagram label.

Cabinets Affected

OD460 chillers manufactured during November and December 2015. The manufacturing date can be found within the serial number on the cabinet rating label (on the cabinet interior ceiling). The first 2 numbers show the year of manufacture (15 = 2015), and second 2 numbers show the month of manufacture (11 = November).

Condenser Fan Motor Wiring

The condenser fan motor can be programmed to run at different speeds, and uses the black wire as a signal wire to control fan speed. In the OD460, all condenser fan motor speed settings are programmed to the same speed, therefore the wiring difference does not affect fan speed and operation.

The OD460 wiring diagram label (LAB11108, attached to the back of the front kick panel), shows the black signal wire from the condenser fan motor terminating at terminal 1 on the unit terminal block. However on some cabinets, the condenser fan motor may be wired differently to the label, with the black signal wire terminating at terminal 5 on the unit terminal block.

The diagrams below show the wiring as it is in the wiring diagram label (Fig.1), and the alternative method (Fig. 2). Both of these are functionally correct.

Servicing

The condenser fan motor cable is terminated at the unit terminal block, inside the unit junction box. To access, isolate the cabinet from the power supply, remove the refrigeration unit from the cabinet and remove the lid from the unit junction box.