HVAC systems rely on a coordinated set of flow control and electrical control components to maintain comfort, efficiency, and reliability across residential, commercial, and industrial environments. For OEMs, these components directly influence system performance—affecting everything from refrigerant stability to compressor protection, fan control, and overall energy management.
Refrigerant management begins with refrigeration valves, which regulate refrigerant flow through evaporators, condensers, heat pumps, and packaged rooftop units. These valves help maintain precise superheat and subcooling conditions, ensuring compressors operate within safe limits and coils deliver consistent heating or cooling output. In variable capacity systems, dependable valve performance is essential for smooth modulation and improved seasonal efficiency.
Commercial refrigeration applications often require high power switching. Deltrol Controls offers one of the most extensive power relay product lines in the industry. We also offer a complete line of general purpose, magnetic latching, buzzers, and clappers. Applications include compressors, and other high-power draw components.
Together, these components form the control and protection infrastructure that HVAC OEMs depend on. Refrigeration valves stabilize thermal performance, relays manage electrical loads, magnetic latching relays support advanced energy saving architectures, and buzzers and clappers enhance safety and serviceability. Integrated effectively, they help HVAC equipment deliver long term reliability, precise environmental control, and reduced operating costs.
Deltrol Controls offers a wide variety of dispensing valves, solenoid valves, linear solenoid actuators, and relays commonly used in commercial refrigeration OEM designs.
Your HVAC system is only as strong as the components behind it
Work with Deltrol Controls to integrate high‑power relays, precision valves, and durable solenoid technologies that keep your equipment stable, protected, and energy‑efficient.
Refrigeration Valves
Deltrol Controls refrigeration valve design is compact and economical. Designed to withstand refrigerants up to 180 degrees F and operating pressures to 300 psi. Materials selected for the refrigeration valve construction include lead free brass valve body, seal options include Neoprene & Viton. Standard coil voltages include 110/120VAC & 220/240VAC.
General Purpose Relays
Electrical switching is handled by general purpose relays in air handlers, condensers, furnaces, and ventilation systems. These relays switch motors, blowers, pumps, heaters, and solenoid circuits, providing safe isolation between low voltage control boards and high voltage loads. Their reliability directly affects equipment uptime and service intervals.
Power Relays
Power relays are fundamental to how systems switch, protect, and manage high‑current loads. In HVAC, they act as the bridge between low‑voltage control signals and the high‑voltage components that actually move air, circulate refrigerant, or generate heat. Their reliability directly affects system uptime, service intervals, and overall equipment safety.
Magnetic Latching Relays
For applications requiring secure state retention during power loss or low energy operation, magnetic latching relays offer a critical advantage. They maintain their position without continuous coil power, making them ideal for smart thermostats, zoning systems, economizers, and energy management modules. Their low power design supports modern HVAC strategies focused on reducing standby consumption and improving overall system efficiency.
Buzzers & Clappers
Audible indicators such as buzzers and mechanical clappers play an important role in diagnostics and safety. These devices provide alerts for fault conditions, filter changes, freeze protection, high pressure cutouts, or service reminders. In commercial and industrial systems, clear audible signaling helps technicians quickly identify issues during maintenance or emergency situations.