Bypassing a safety limit is only permissible briefly for diagnostic troubleshooting by a qualified HVAC technician and must never be left jumpered during regular equipment operation

ensuring original calibration is maintained

For technicians performing seasonal maintenance or a full oil charge

this two-way valve features an Amodel flow characterizing disk to maintain a strict equal percentage flow

6 Cv rating and equal percentage flow provide stable control and eliminate hunting in your hydronic loops

Carrier 321975-201 Filter Retainer Rod L99H008 Bypassing a safety limit isThe Carrier 321975 201 Filter Retainer Rod is a critical genuine OEM replacement part engineered to maintain the structural integrity of the filtration system in high efficiency Carrier HVAC units. As a veteran grade HVAC filter support, this rod is designed to apply precise tension across the media, preventing filter bypass and ensuring that all return air passes through the filtration interface. Properly secured 321975 201 retainer rods are