Commencing Operation And Control Behavior - Telca TAC-12D-10 Service Manual

Service manual: TAC-12D-10
Fig. 4.2 D-SUB 9PIN female

5. Commencing operation and control behavior

Following the completion of mounting and a waiting period of approximately 30 minutes
(to allow oil to collect in the compressor in order to ensure lubrication and cooling)
electrical connection can be made.
The cooling unit operates automatically, i.e. after electrical connection, the internal fan
will run continuously to circulate the air inside the enclosure. This results in a uniform
temperature distribution in the cabinet. The compressor and heater (optional) are
controlled by a microcontroller.
● Compressor and external fan control
If the temperature of internal air inlet exceeds P0 (35°C), the external fan and
compressor will be switched on.
Contrarily, if the temperature of internal air inlet is lower than P0-P1 (35-6=29°C), the
external fan and compressor will be switched off.
Important: In order to avoid cyclic operation, switch-on of compressor is delayed by
about 3 minutes since last switch-off, please don't take this as a failure!
● Heater control (optional)
If the temperature of internal air inlet is lower than P2 (5°C), the heater will be switched
on.
Contrarily, if the temperature of internal air inlet exceeds P2+P3 (5+10=15°C), the heater
will be switched off.
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