What is the specification for the sequencer code H1-24 C45-75?

The specification for the sequencer code H1-24 C45-75 indicates that the contacts close within a range of 1 to 24 seconds after the coil is energized and open within a range of 45 to 75 seconds after the coil is de-energized. This timing is crucial for proper operation in HVAC systems where sequential control of electric heating elements is required.

The delay in closing allows for gradual engagement of the heating elements, which helps to prevent system overload and ensures a more stable performance. The extended delay in opening, which is 45 to 75 seconds, contributes to maintaining the heating output even after the call for heat has stopped, allowing for a smoother temperature regulation within the space. This balance of timing helps to improve comfort and efficiency while protecting the system from abrupt changes in power demand.

Understanding this specification helps technicians ensure that they install and configure heat pump sequencers correctly, thereby optimizing system performance and energy efficiency.