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supplied via the 0-10VA connection on the Customer Connection Board.
When this feature is in use, an installer selected Delta T is maintained with the Supply and Return sensors, increasing efficiency and providing
better system temperature control. When the difference between the Supply and Return temperatures is greater than the desired setting, the
pump will increase speed and flow to compensate. Conversely, if the Delta T is less than the desired setting, the pump will decrease speed
and flow to compensate.
NOTE: This feature may be used in Primary / Secondary piping arrangements ONLY!
Variable Speed Pumping Wiring:
1. Connect the boiler pump as shown in Figure 22 to the terminals marked 1 – (HOT), 2 – (NEUT), and 3 – (GND). The connections shown
are suitable for a maximum continuous pump draw of 2 amps at 120 volts. If the pump requires more current or voltage than the 120 volts
supplied, an external motor starter or contactor will be required.
2. Connect the 0-10v input wires on the variable speed pump to the 0-10v output on J9 of the customer connection board. Connect the
positive pump input wire to J9-24, and the negative wire to J9-25.
NOTE: When making wiring connections, ensure proper polarity or the system will not operate properly.
Figure 23 - Cascade Termination Plug Detail
Figure 24 - Cascade Master and Follower Wiring
WHL-053 Rev. 00 Rel. 003 Date 7.21.17
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