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5. The wire harness for the recirculation pump is bundled with the wire harness from the PC Board (the
pump wiring is labeled to show where to connect to the tankless water heater). The connector from
the tankless water heater has a black and white wire with the label "Cut wire to connect to pump."
DO NOT CUT THE WIRE. To connect to the pump, remove the protective cap from the wire lead
and plug the GTK03U connection into it.
Push in Tab to
Remove Cap
6. Connect the ground wire to the body of the tankless water heater.
Ground Wire
Rinnai Circ-Logic with Grundfos GTK03 Kit
Tankless Connections
Mated Together
GTK03U Connections
9
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