CFESA Electrical Certification Practice Test 2025 - Free Commercial Food Equipment Service Exam Questions and Study Guide

The correct answer is that not all of the contact sets on an SJ model thermostat cycle with changes in the temperature. In these thermostats, multiple contact sets may be present, but often, only one set is designed to respond to temperature changes.

Typically, a thermostat is designed to maintain a set temperature by opening or closing contacts to control the electrical circuit. However, in the case of an SJ model thermostat, it may have additional features or contacts that do not directly engage in the temperature control process. For instance, some contacts might be designated for auxiliary functions, like alarms or indicating lights, which do not cycle with temperature variations.

Therefore, it is crucial to understand that while the main purpose of the thermostat is to regulate temperature by cycling certain contacts, other contacts may remain unaffected during typical operation, leading to the conclusion that not all the contact sets change with temperature alterations. This distinction is important for technicians working with these devices, as it influences how they diagnose and repair systems relying on these thermostats.