York AFFINITY OptiHeat YAW040 Installation Manual page 14

AFFINITY SINGLE STAGE HYDRONIC WITH OPTIHEAT INSTALLATION MANUAL
Electrical Information cont.
Variable Speed Units cont.
Two Pump Variable Speed Flow Center cont.
The use of the black wire on the left hand pump is ONLY to be connected for troubleshooting of the pumps. The left hand pump will have
a closed end splice connector crimped to the black wire. Cut the closed end splice connector off and strip the wire. During troubleshooting
remove the black wire from the right hand pump from the AXB P3 VS DATA S screw terminal and connect the black wire from the left hand
pump to the same location. After the troubleshooting is complete remove the black wire from the left hand pump and connect the black wire
from the right hand pump.
Place electrical tape or wire nut on the left hand pump black wire. The two pump variable speed flow center cannot have each UPMXL 25-
124 pump wired to two separate heat pumps otherwise damage to the pumps will occur (unless it's an NPD Series flow center).
Figure 4c: Two VS Pump Low Voltage Wiring
Figure 4d: Two VS Pump High Voltage Wiring
Note: Aurora AXB must be used to control
the UPMXL 25-124 pump.
Aurora AXB
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Aurora AXB