22
34-53 08/14
• Outside Air Temperature Sensor Installation - The wire leads for the outdoor sensor should be connected to the
TempTrac control located on the control panel of the boiler. Use sensor P/N 102163.
• Pass the temperature sensing probe through the wall to the building's exterior. Use sound construction
techniques to create and insulate the wall penetration. To operate properly, the sensor must be located away
from direct sunlight and protected from the weather. The length of the wire leads on the thermistor is 25 feet. If
more wire is needed, it is admissible to splice 22-gage, multi-strand copper wire into the thermistor coil.
(Thermistor probe should be protected with suitable outdoor cover)
10.6 Riverside Hydronics® ONTRAC® Boiler Management System (BMS)
The OnTrac is a separate multiple boiler control designed to coordinate the operation of multiple boilers using
TempTrac controls. This section will briefly summarize the controller’s capabilities and features. (See ONTRAC
Programming Manual #34-152 and Wiring Guide #34-151 for full description.)
− Controls up to 20 boilers (more with expansion card)
− PID control with full-color, touch-screen interface
− Basic functions include lead-lag, outdoor reset, nighttime setback and isolation valve control
− In hybrid systems, prioritizes and rotates through up to 12 condensing boilers before energizing and
rotating through up to 8 non-condensing boilers
− Communicates with boilers by Modbus RTU protocol over 485 serial connection (2-wire, shielded daisy
chain)
− Connects to Building Automation Systems through either a 4-20mA analog signal for remote set point or
over the non-proprietary Modbus TCP/IP network protocol. Gateways are available for other protocols.
− Includes two equipment activation and proving terminals for system pumps and combustion air.
10.7 BAS Protocol Gateways
When communicating over a network connection, the standard protocol of the TempTrac control is Modbus RTU.
The standard protocol between the OnTrac and the BAS is Modbus TCP/IP. A gateway will be required to
communicate with the BAS if it uses a different protocol. Riverside Hydronics offers pre-mapped gateways that
support BACnet MSTP, BACnet IP, Lonworks or Johnson Controls N2. Consult factory for other protocols. (For a
general overview of the application of this gateway, refer to Setup Manual #34-525.)
These third-party supplied gateways are custom-programmed components that must be sourced through Riverside
Hydronics.
11 SEQUENCE OF OPERATION
1. Incoming 120VAC
a. Full time power to the Main Control Switch
b. Full time power to the Variable Frequency Drive
2. Power On - When the main control switch is turned on:
a. 120v is applied to the step-down transformer (24v)
b. 120v is applied to the L.W.C.O. terminal L1
c. 120v is applied to the Fenwal Flame Safeguard Control
d. 24v is applied to the TempTrac operating temperature control terminal L1
Display Parameter Description Value
St1
Temperature at the return boiler loop that activates /deactivates boiler firing
165° F
tt
Outdoor air temperature where outdoor reset is activated and deactivated
30° F
rr2
Outdoor air temperature range through which St1 setting will be adjusted
-20° F
rr1
Maximum increase of St1 setting when outdoor reset is activated
10° F
tt2
Outdoor air temperature where boiler is de-energized
100° F
Ht2
Differential from tt2 required to reenergize the boiler
-10° F
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