A103 temperature controllers stand out for their versatility and can be used for both heating and cooling. The control mechanism is thermostatic On/Off control with hysteresis adjustment. The two relay outputs are configurable between heating, cooling, or cyclic timer functions. With the two supplied sensors, temperature control of two distinct environments is possible, operating between -50 and 100C.

The A103 has three main operating modes: as a dual stage controller (uses only one sensor and activates two different loads, each with a different setpoint, for heating, cooling, or triggering alarms), a dual zone controller (works as two independent temperature controllers, each output activated according to its own sensor with its own setpoint), or a timing controller (the first output controls temperature while the second works to a cyclic timing schedule).

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Technical Details

The A103 can be configured for 6 applications via the “Fu” parameter:

1. Second stage depending on sensor 1 both relays controlled by the same sensor (sensor 1) via two setpoints.
2. Second stage depending on sensor 2 acts as a double controller, each relay activated by its own reference sensor, activating two systems in parallel.
3. Electric Defrost sensor 1/relay 1 activates the compressor; sensor 2/relay 2 performs defrosting via electrical resistance.
4. Hot Gas Defrost sensor 1/relay 1 activates the compressor; sensor 2/relay 2 performs defrosting via hot gas.
5. Cyclic Timer controller acts for heating or cooling, with relay 2 cycling per parameters d1, d2, d4 and d5.
6. Milk Cooler exclusive mode for milk cooling systems, with the second relay output used as a timed agitator.

Frequently Asked Questions

Can this control two separate zones independently?
Yes in dual zone mode, each of the two relay outputs is activated according to its own sensor with its own setpoint, functioning as two independent controllers in one unit.

Is this suitable for refrigeration with defrost?
Yes dedicated Electric Defrost and Hot Gas Defrost modes are built in, using one sensor/relay pair for compressor control and the other for defrost.

Does it come with sensors?
Yes two sensors are supplied, one for each zone or control stage.

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