CNT-SVX09B-EN 11
Chapter 4
Applications of the Tracer
MP503
This chapter provides information about the function of inputs and out-
puts and examples of wiring for Tracer MP503 applications. The Tracer
MP503 I/O module is a field-installed device. It is used to monitor inputs
and control binary outputs. The module has four configurable inputs and
four binary outputs.
Inputs
The Tracer MP503 has four inputs. Each input can be configured to be
binary, thermistor, 0–20 mA, or 0–10 Vdc. You may have any mixture of
these input types connected to the module. The factory-default input type
is thermistor. To change the configuration of the input, use the device
plug-in and a service tool, such as the Rover service tool. No jumpers need
to be set on the circuit board.
Binary inputs
When an input is configured as binary, the Tracer MP503 equates a sig-
nal of 0 Vac with open contacts and 24 Vac with closed contacts.
Thermistor inputs
Thermistor inputs are used to measure temperature. They must be Trane
10kΩ (at 25
o
C) thermistors. Any Trane zone temperature sensor can be
connected to the Tracer MP503; however, the module will not recognize
the setpoint thumbwheel or fan speed switch that appears on some sen-
sors.
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