Wiring
IMPORTANT: All electrical wiring connections should be made only by trained personnel using Class 1 wiring, and in strict accordance with the National Electrical Code and local regula- tions. Both of the incoming power lines should be fused with 2AG, 0.5 A maximum rated fuses.
The OTC25 controller has
however, power and signal wires should always be kept separate. We recommend separating wires into one bundle for power (from line power and output) and one bundle for signal (from thermocouple).
The OTC25 power supply accepts 100 through 250 Vac and 120 through 250 Vdc line power without any switch settings or polarity considerations.
COM.
N.O.
COM.
N.O.
L2
L1
OUTPUT #2
OUTPUT #1
(+)
Figure 3. Wiring Connections
Operation
Athena Series OTC25 Digital
Temperature Controller
Just a few easy steps are required before your OTC25 can be placed into service. After completing the mounting and wiring procedures as previously instructed, set each controller parameter using the simple
Power On
When power is first applied to the OTC25, all segments
of the LED display, as well as the discrete indicators, will be momentarily illuminated while the instrument goes through a series of diagnostic checks to verify proper operation of the unit.
A software version will then be displayed, e.g., 
. The last two digits of this code indicate the software revision supplied with your controller. Please provide this revision number when contacting us regarding your unit. This display is followed by a mnemonic code representing the OTC25 model type.
2
