Product Manual

05/19/2016 4 BI514
MULTIPLE BOILERS
This boiler series now includes a method for automatically staging any
number of parallel-plumbed boilers. Order plug-in relay EB-C-STG5.
The thermostat is connected only to the first boiler, when all stages are
on for more than 5 minutes, this new plug-in relay module turns on the
next boiler (R and W), and a second EB-C-STG5 could be used to turn
on the third, etc.
Outdoor Reset Option
The EB-WX-** boiler comes equipped with an outdoor sensor (shipped loose). This sensor can be
connected to the board to allow for outdoor reset function.
What is Outdoor Reset?
Outdoor reset is where the Electro Boiler DT (desired water temperature) shifts up and down based on the
outdoor temperature. The water temperature coming out of the boiler will be higher when it’s cold outside
and lower when it’s warmer outside. The idea is to have the boiler work with the building heat loss to
maintain a more even BTU delivery to the space. This helps with overall system efficiency as well.
NOTE: The EB-S-** does not include an outdoor sensor. However, one can be ordered if outdoor reset is
required.
Outdoor sensor part number: WFS25F
Outdoor Reset Activation
If it is determined that outdoor reset is required for this application, it needs to be activated.
Follow this sequence to activate outdoor reset:
Step 1: Power down the Electro-Boiler
Step 2: Connect the outdoor sensor
 Red wire to “RED”
 Black wire to “OT”
 White wire to “COM”
Step 3: Power up the Electro-Boiler
See: CONTROLLER SETUP for more information on outdoor reset.