Manual USDT Revsion 8 - Thermomax Technologies

USDT 2001 INSTALLATION
P ower Connections and Wiring Diagram
NOTE 1: Always disconnect the controller from power supply
before opening the housing.
NOTE 2: The controller should be properly grounded. Flexible wires,
18/3 (gauge/conductor) simplify connection to the terminals. All
connections should be secure and adequately tightened, as loose
power connections will over-heat, and may cause fire. It is important
that the specified output loads (245 Watts) are not exceeded. Where
these loads expect to exceed, external relays must be used. It is good
practice to install a 3 amps in-line fuse to protect controller and pump.
Always keep power cables away from sensor cables and other low
voltage signal cables.
NOTE 3: To protect against lightning damage, the system must be
grounded according local regulation. Sensor failures due to the weather
or electrostatic are mostly due to poor grounding.
NOTE 4: If step-down transformer is not mounted on the circuit board,
the unit should be powered by a 24 VDC. A step-down transformer can
be used also instead of DC power source, however, the open circuit
voltage of AC source must be below 24 VAC. T C terminal should be
connected to the Collector Sensor; T T should be connected to the Tank
Sensor. The middle terminal is shared between both sensors.
NOTE 5: The power supply is 115 V if step-down transformer is
mounted on the circuit board. A load of maximum 3 A should be
connected to the load terminals (pump) as shown in both above
diagram and circuit board.
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Thermo Technologies