6.8.3 Hydronic heat pump circulator
The hydronic heat pump circulator must be field-installed and wired. Use a pump control module,
or bring low-voltage wires to the outside unit J6 terminals "CIRCPUMP"to switch a 24V relay
circuit indoors, as shown here:
Jumper at J1 (interlock) (Outdoor wiring)
J6 terminal, switch for "CIRCPUMP" (Outdoor wiring)
Indoor wiring
24V transformer
HPXhydronic heat pump circulator (field-supplied)
24V relay
Figure 16 HPX Series circulator relay field wiring
IBCrecommends the application of the either theIBCSky 35 module for load circulator control
or, alternatively, using a pressure-activated load circulator for which control is unnecessary.
See also Control wiring overview on page 40. The HPX Series does not control load circulators.
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General