York AFFINITY OptiHeat YAW040 Installation Manual page 12

AFFINITY SINGLE STAGE HYDRONIC WITH OPTIHEAT INSTALLATION MANUAL
Electrical Information cont.
Variable Speed Flow Center
Single Pump Variable Speed Flow Center
If a variable speed single pump flow center is used, the flow center will come with two red and one green wires for the high voltage wiring.
The variable speed pump MUST be powered at all times and therefore MUST be wired to the "L" side of electrical system or damage to the
pump will occur (pump cannot be powered from "T" side of compressor contactor). Connect the red HIGH VOLTAGE wires to L1 and L2 on
the AXB, connect the green GROUND wire to the ground lug, as shown in figure 4a. Follow all electrical and local codes for wiring.
The variable speed UPMXL 25-124 pump also requires a low voltage signal to operate properly, if the low voltage signal isn't present the
pump will run at 100%. Route the low voltage harness connected to the pump to the AXB screw terminals on P2 and P3 connectors per
diagram 4b.
Both the low and high voltage harnesses are labeled. The pump will be automatically cycled as required either by the unit or by a signal
from another unit sharing the same flow center. Pumps are protected by circuit breakers as shown on the unit schematic.
Figure 4a: Single VS Pump High Voltage Wiring g g
Figure 4b: Single VS Pump Low Voltage Wiring
g g g
Aurora AXB™
Note: Aurora AXB must be used to control
the UPMXL 25-124 pump.
Aurora AXB
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