3.14.3 Other wiring
Danger
Do not connect sensors to “Therm” terminals. Overheating components can result in
serious personal injury and/or property damage.
Other optional low voltage connections to the control board include:
Two auxiliary Interlocks - for external safety devices as may be required by some
jurisdictions, such as an external low-water cutoff.
Contacts for Indoor and Outdoor temperatures Sensors associated with reset heating. A
10K ohm thermister (resistor dependent on temperature) for outdoor reset sensing is
supplied with the boiler for improved comfort and combustion efficiency.
One pair for a DHW tank sensor. Connect to DHW S (not the respective Therm. 1,2,3,4
location) and the boiler automatically detects and calls a smart DHW routine.
One pair of contacts for remote Secondary Loop temperature control.
One pair (marked BoilerNet) for network connection – this is used for connecting multiple
IBC modulating appliances for autonomous staging.
The bottom pair of contacts (labeled External Control) receives a 0-10VDC (default) or 4-
20 mA signal from an external boiler controller for direct throttle control. The boiler’s own
sensors act as high limits only. The user must enter maximum and minimum boiler
supply temperatures.
Note
Sensors connected to any sensor input contacts must be of the NTC Thermister type
with a resistance of 10,000 ohms at 77°F (25°C) and β = 3892. We do not
recommend using 3rd party supplied sensors. Compatible water temperature
sensors and outdoor sensors can be supplied by your IBC distributor.
3.14.4 Thermostat / sensor wiring
Each of the four loads has dry contacts for thermostats as marked on the lower connector strip
(e.g., "Therm 1"). Gang lines from a multiple-zoned load (e.g., off the end-switches for each
radiant floor zone) present a common thermostat signal to the controller. 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 Therm
terminals. Consult the Controller manual for more detailed instructions.
3.14.5 Wiring zone valves in place of pumps
Not to be confused with using zone valves to divide a load with its own pump – for such see the
previous section. If using zone valves instead of pumps to manage heating loads:
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