YZT - Defrost Board Replacement

York Heat Pump: YZT

Re: Defrost Board Replacement

When replacing a Communicating Defrost Board, it is required to manually set the unit tonnage before initial operation.

Set the unit tonnage by adjusting the dip switches as shown in the table below.

After the dip switches are set, press the PUSH BUTTON, greater than six seconds without a call for compressor operation. The new tonnage will be displayed on the 7-Segment display and the configuration will be stored in the controls the memory.

If the proper tonnage is not displayed, check and confirm dip switch selections, then repeat the above PUSH BUTTON operation once again.

It is not necessary to cycle power after configuring the tonnage.