KMC Controls RCC-1504 Relay

The KMC Controls RCC-1504 Relay is an indispensable pneumatic reversing relay engineered to invert proportional signals in complex HVAC control logic. Specifically calibrated for a 9 PSI crossover pressure, this adjustable reversing relay ensures that as input pressure increases, the output pressure decreases proportionately. This functionality is critical for the precise operation of normally open or normally closed damper actuators and valve assemblies within air handling units and VAV systems. The "9#C-0" designation confirms its factory 9 PSI setup, while the integrated mounting bracket facilitates secure installation in control cabinets or directly onto equipment frames.

Designed for durability in industrial environments, the RCC-1504 features a high-capacity air flow of 1728 scim at 20 PSI, minimizing signal lag in large pneumatic loops. The unit includes a bias adjustment capable of advancing or retarding the output by +/- 15 PSI, allowing technicians to fine-tune the reversing signal to match specific field requirements. For optimal longevity, this component must be supplied with clean, dry, oil-free control air. Its flame-retardant plastic housing and 3/16-inch nipple connections make it a standard choice for pneumatic control system retrofits and repairs.

Key Benefits

• Signal Inversion: Converts direct-acting proportional signals to reverse-acting for seamless actuator compatibility.
• Field Adjustability: Integrated bias adjustment (+/- 15 PSI) allows for precise calibration and signal offsetting.
• High Flow Capacity: Supports rapid response times in pneumatic circuits with an air capacity of 1728 scim.
• Robust Mounting: Included steel bracket ensures stable vibration-resistant placement in high-traffic mechanical rooms.
• Universal Compatibility: Standard 3/16" nipples allow for easy integration with 1/4" OD polyethylene tubing.

Common Questions

How do I adjust the crossover point on the RCC-1504?
While the unit is factory calibrated at 9 PSI, the bias adjustment screw allows you to shift the output signal relative to the input pressure to accommodate specific sequence-of-operation needs.

Can this relay be mounted in any orientation?
Yes, the lightweight design and included bracket allow for flexible mounting, though it is standard practice to install it where the adjustment screw remains accessible for maintenance.

What happens if there is moisture in the control air?
Pneumatic relays like the RCC-1504 contain precision internal orifices; moisture or oil contamination will lead to clogging, sluggish response, and eventual component failure.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.