A container unit's microprocessor-controlled...

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Question 1 of 205eccef9dbacbc34ba4d46088

A container unit's microprocessor-controlled temperature controller is set at -28.9°C, appropriate for a frozen cargo of ice cream. In this mode of operation, according to the illustrated temperature controller functional diagrams, what features are locked out? See illustration GS-RA-35.

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🔍 Key Concepts

• Difference between diagram A (refrigerated cargo) and diagram B (frozen cargo) in RA-0035 • How the controller behaves when temperature is just above, at, and below the set point • Which functions are shown as present (labeled boxes) and which are missing in frozen-cargo mode

💭 Think About

• Compare which control functions are available in diagram A versus diagram B and think about why ice cream at -28.9°C must never be warmed above set point • Look at what the unit does when temperature falls below the set point in frozen mode—does it ever switch to a heating cycle, or only to fan/air circulation? • Ask yourself whether the controller uses fine modulating control or only simple on/off cooling when in deep-frozen mode

✅ Before You Answer

• Identify which labeled functions appear in both diagrams and which appear only in diagram A • Verify what is written in the lower (cold) band of diagram B—does it mention heating anywhere? • Confirm whether the word modulating appears in the frozen-cargo diagram and consider what that implies about which feature is disabled

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