WIRING THERMISTOR TO THE BOARD
The sensor is connected directly to the B&D Temperature Board (H2-2TC) inside the Rotational Control Box (BDCB-RC4HP).
Scranton, IA 51462
Phone (712) 652-3424
www.bdmfginc.com
8
WIRING DEMAND SIGNAL
The Rotational Control Panel (BDCB-RC4HP) gets a request for demand for hot/cold water from a controls dry contact
through the XY, XO, XR terminals in the upper right corner of the BDCB-RC board. See image below for terminal
contact location.
The dry contact closes on demand control sending the power it receives from the rotational control XR back to the
rotational controls XY terminal. This will start a water device. The water device that is started depends on where it left
off in its rotational control program. (Device that is on has a light designating that it is actively running.) This then starts
the rotational controls functionality.
Only one temperature thermistor sensor is needed in the Rotational Control Box (BDCB-RC4HP) to sense temperature for
all the displays. The temperature is distributed to the other temperature controllers via a signal generation cable wired
into the TX terminal located in the lower left hand terminal on the temperature controller.
WARNING: The TX terminal is a communication port only and must only be connected to another TX
communication terminal. If power is applied to this terminal the internal circuitry of the B&D
Temperature Board (H2-2TC) will be damaged, in which case the warranty for this product will be
voided.
NOTE: XY,XO & XR Terminals are powered contacts. These contacts send out 5vDC. Has to be wired to a dry
set of contacts.
THERMISTOR
CONNECTION
B&D TEMPERATURE BOARD (H2-2TC)
B&D ROTATIONAL BOARD (BDCB-RC)
DEMAND SIGNAL
TERMINAL CONTACTS
XY,XO,XR
TERMINALS
EQUIPMENT EXAMPLE:
HSS BUFFER TANK MAIN BOARD
OTHER WATER DEVICES
WARNING: Be sure the power to the Rotational Control Panel (BDCB-RC4HP) is turned off at the
supply source before continuing with the steps below. Serious injury or death could occur if this
step is not followed.
The sensor is wired into the temperature controller in the upper left hand side of the controller on the two terminal
connection labeled GND and TEMP. The sensor wires are not terminal specific and can be wired into either terminal as
long as both wires are wired into a separate terminal. The Rotational Control Panel comes with a six foot long 33kΩ
sensor pre-wired into the temperature controller. If the sensor wire needs to be extended use a minimum 22 AWG wire
to extend it up to 25 foot.
The temperature sensor can be connected to any of the 3 B&D Temperature Controllers (H2-2TC) to receive a
temperature reading
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