The IC974 controller has two analogue inputs for NTC temperature probes (parameter selectable PTC) and four voltage-free digital outputs on relays for control of heating and cooling functions in the cooler , defrost functions and control of evaporator fans.

The defrost cycle may be time-terminated or end of cycle temperature-terminated using a special probe on the evaporator.

The value read by the probe is shown on the display with three digits plus the minus sign. Reading with a decimal point is parameter-programmable.

The buzzer is optional. All versions have a TTL connection so that the Copy Card quick programming accessory can be used.

LX models can also be connected to the TelevisSystem.

In this version a specially configured programmable digital input selects the operating mode (manual change-over).In all models a 12V power supply is available.