Rinnai CNTRLDRCINW Operation And Installation Manual page 7

Thermostat connection to the indoor unit
Indoor unit
Connect the terminals on the wired controller (HA, HB), and the
terminals on the indoor unit (HA, HB). There is no polarity between HA
and HB, refer image below.
Wired controller
Indoor unit
HA HB
HA
HB HB
60 mm
Loom
knockout
HA
HB
Indoor unit
PCB
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