Specifications

Riverside Hydronics
®
, LLC WWW.RIVERSIDEHYDRONICS.COM 34-151 06/2014
3220 Galvez Avenue - Fort Worth, Texas 76111 - Tel [phone] Page | 8
The system and outdoor sensors for the OnTrac are typically connected through Boiler 1 for the system
sensor and Boiler 2 for the outdoor sensor. This is the default assignment but the location can be
changed in the event of a faulty control. Follow the instruction below for wiring termination.
The wire leads for the system and outdoor sensor should be connected to the TempTrac control located
on the control panel of the boiler. Use sensor P/N 102163 and thermal well P/N 109535 for the system
sensor. The thermal well will not be necessary for the outdoor sensor.
1. Turn off power to the boiler
2. Open the control panel to gain access to the back side of the TempTrac® controller.
a. On a Centauri, & VT3 boilers, you would remove the lower cover via the center FLAT
HEAD screw, and then remove the 4 screws from the top of the control enclosure and
then the panel and top will rotate out and down on a hinge.
b. For other Boilers, please reference their corresponding I & O MANUAL for proper access
to control enclosure.
3. The sensor leads connect to the back of the TempTrac control mounted in the control panel.
4. At the back of the TempTrac control, connect one lead of the system sensor or outdoor sensor
to green screw terminal 16 (TP3 3 Input) and the other to green screw terminal 17 (TP
COMMON). There is no polarity to be concerned about, so either wire can be connected to
either terminal. Terminal 17 is a common terminal shared by TP1 & TP2 temperature sensor
probes. Do not remove any wires already connected to terminal 17.
System Sensor, Outdoor Sensor
or System Sensor for Tier 2
Independent Operation
Common Terminal
PROBE
TERMINALS
W
IRING SYSTEM SENSOR AND OUTDOOR SENSO
R