If set to "Ext.Cont.", the controller only uses the Ext. Cont. terminals to determine a
call for heat. If the voltage at the Ext. Cont. terminals is below 2.1VDC there is no
call for heat. If the voltage is at or above 2.1VDC, then there is a call for heat.
4. In the Minimum control field, set the minimum supply set point temperature from the BMS.
5. In the Maximum control field, set the maximum supply temperature for the BMS (e.g.,
182°F). Voltage 2.1VDC.
6. In the Maximum (boiler) supply field, enter the high limit for the BMS (e.g., maximum
190°F) Voltage 9.5VDC.
7. In the Water from field, for a:
Single boiler, choose Outlet > OK.
Multiboiler network, choose Sec. Loop > OK.
Buffer tank, choose DHW > OK.
8. Save.
4.4 Setting up external control to control water
temperature in a single boiler or in each boiler wired on
a network
The following procedure documents setup required when the external control is modulating the
boiler output only for a single boiler operation, or in a multiboiler system where system input from
the BMS is wired to each boiler. An IBC network cannot be used.
To set up external control:
1. Go to > Advanced Setup.
If the boiler has never been programmed, all loads will be set to "Off".
2. On the Select a load screen, choose Ext. Control > OK. The settings screen is populated
with pre-programmed values appropriately selected for typical residential applications.
3. To change a default value: Choose a setting > Using the number pad, enter a new value >
OK. > Save.
4. To enter the firing rate, tap Installer Options > enter the default password 1445 > OK
>System Options > Enter the required minimum and maximum firing rate in the Minimum
Output and Maximum Output fields > OK > Save.
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