How is the DFR kept organized when the DTC N.O. contacts open?

The correct answer highlights how the DFR (Differential Fan Relay) maintains its organization in response to the state of the DTC (Differential Temperature Controller) N.O. (Normally Open) contacts. When these contacts open, it indicates that certain conditions have been met, prompting the system to respond in a specific manner.

In this scenario, when the DTC N.O. contacts open, it leads to the closing of the DFR N.O. contacts. This is an important reaction because the closure of these contacts can help regulate the operation of fans or other components in the heat pump system, ensuring that the unit operates efficiently and effectively under the current conditions. By organizing the system in this way, it can respond to temperature variations or other environmental factors, maintaining optimal performance.

In contrast, increasing fan speed or adjusting temperature requirements does not directly pertain to the organizational aspect driven by the state of the DTC contacts. The system switching to cooling mode might occur due to different operational triggers, but it is not specifically tied to the closure of the DFR contacts in this context. Thus, the correct understanding of the closing of the DFR N.O. contacts, in response to the opening of the DTC contacts, is central to the effective