TRACE
MATE
Chapter 3
APPLICATIONS
3.1
Mechanical Thermostat Replacement
Mount the control unit near the pipe being traced in a
location with easy access. Replace the thermostat
capillary tube with an RTD mounted on the pipe and
connect the existing heater and power wires to the
TraceMate as shown in Figure 3.1. A green alarm status
light, visible to maintenance personnel, is connected to
the TraceMate LED alarm output and should be always
on. If the light goes off, the following may have oc-
curred: (1) bulb burnt out (fail-safe indication); (2) no
control power available; (3) system fault. Examine the
LEDs inside the TraceMate to determine the cause of the
alarm.
Advantage of this scheme over mechanical thermostats
is: easy setpoint adjustment and early warning of system
faults with TraceCheck system exercising every 24 hours
and rapid fault diagnosis in the event of a problem.
Alarm Annunciator
If an alarm annunciator or programmable controller is
available, terminal 10, 11 &12 can be used as a low cost
digital interface. These terminals are form C dry con-
tacts. A separate voltage source must be connected across
these terminals as shown in Figure 3.2 for the annuncia-
tor to sense the alarm logic
Switching Requirements
Two different TraceMate models are available to accom-
modate different power configuration of electric heat
trace. The single pole switching model is used for phase
to neutral power feed such as 120VAC. 208 and 240VAC
are both phase to phase power feed and will require a two
pole switching model to ensure both lines are switched
off. Not only is this an electrical code requirement, but to
ensure both connections to the heater are not hot when
the controller is not calling for heat. This is especially
important for the ground fault function to operate
properly since switching only one line there is a 50%
chance that the heater output is properly tripped.
Figure 3.1 Thermostat Replacement
Figure 3.2 Alarm Annunciator
