Claude Sonnet 4.0 didn't say "nope" to the same prompt but also didn't agree. It replied:
Actually, 24V control signals in HVAC are typically AC, not DC. Most residential and commercial HVAC systems use 24VAC for their control circuits.
This 24VAC comes from a step-down transformer that reduces the standard line voltage (120V or 240V AC) down to 24VAC. The reasons for using AC include:
* Safety - Lower voltage reduces shock hazard
* Simplicity - Direct transformation from line voltage without need for rectification
* Cost - AC transformers are inexpensive and reliable
* Compatibility - Most traditional HVAC components (thermostats, contactors, relays, gas valves) are designed for 24VAC
However, you will find 24VDC in some applications:
* Modern digital/smart thermostats and controls
* Building automation systems (BAS)
* Some newer high-efficiency equipment
* Systems that need to interface with low-voltage DC electronics
But if you're working with a typical residential or light commercial HVAC system, assume 24VAC unless specifically noted otherwise. Always verify with a multimeter set to AC voltage when troubleshooting!
Actually, 24V control signals in HVAC are typically AC, not DC. Most residential and commercial HVAC systems use 24VAC for their control circuits. This 24VAC comes from a step-down transformer that reduces the standard line voltage (120V or 240V AC) down to 24VAC. The reasons for using AC include:
* Safety - Lower voltage reduces shock hazard
* Simplicity - Direct transformation from line voltage without need for rectification
* Cost - AC transformers are inexpensive and reliable
* Compatibility - Most traditional HVAC components (thermostats, contactors, relays, gas valves) are designed for 24VAC
However, you will find 24VDC in some applications:
* Modern digital/smart thermostats and controls
* Building automation systems (BAS)
* Some newer high-efficiency equipment
* Systems that need to interface with low-voltage DC electronics
But if you're working with a typical residential or light commercial HVAC system, assume 24VAC unless specifically noted otherwise. Always verify with a multimeter set to AC voltage when troubleshooting!