Other Wiring; Load Pump Wiring - IBC EBX Series Installation And Operation Manual

Ensure that there are no disturbing influences on the call-for-heat lines - for example, that there
are no coils to switch an air handler motor. Most power stealing thermostats can be connected
directly to the CN2 terminals.

6.12.5 Other wiring

Other optional low voltage connections to the control board include:
An auxiliary Interlock at CN6 terminals 3 & 4- for external safety devices as may be
required by some jurisdictions, such as an external low-water cutoff.
Contacts for outdoor temperature sensor associated with reset heating at CN6 terminals
5 & 6. A 10K ohm sensor for outdoor reset feature is sold separately as IBC part P-9067.
Thermostat, or zone valve endswitches parallel-wired (three shown)
RS485 connection for MODBus control: see ibcboiler.com for more details
Jumper, or to dry contact on external safety device (interlock)
Outdoor temperature sensor, located on North exterior of building
Figure 15 Thermostat, interlock and outdoor sensor field wiring

6.12.6 Load pump wiring

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Section: Installation