Johnson Controls C-2220-11 Pressure Selector

The Johnson Controls C-2220-11 is a high-performance pneumatic high-low pressure selector designed for secondary control in multi-zone HVACR systems. Functioning as a master module for low volume input, this unit effectively samples pressure signals from various pneumatic thermostats and controllers. It is engineered to select and transmit both the highest and lowest control pressure signals within a group, ensuring that heating and cooling equipment responds to the zone with the greatest demand. This precise logic prevents simultaneous heating and cooling in dual-duct or multizone systems, optimizing energy efficiency.

Operating with a broad 0-25 psig input range, the C-2220-11 provides a reliable 1-19 psig output @ 25 scm. The modular architecture facilitates significant system scaling; a technician can combine up to 19 slave modules with a single master to manage 20-zone pressure selection. When integrating more than 10 modules, ensure an A-4000-135 high-capacity filter is utilized to maintain signal integrity across the stack. The unit includes integral restrictors specifically for low volume thermostats, providing a regulated 20 psig nominal supply for stable pneumatic transitions.

• Zone Demand Efficiency: Automatically selects the peak demand signal to minimize "fighting" between heating and cooling stages.
• Scalable Modular Design: Supports high-density multi-zone control by interlocking master and subordinate modules.
• Precise Signal Transmission: Maintains 1-19 psig output accuracy for consistent pneumatic logic performance.
• Integral Restriction: Built-in 0.005-inch restrictors deliver the specific 20 scim flow required for low-volume terminal devices.

How do I connect additional zones to this master module?
The C-2220-11 features barbed fittings that mate directly with C-2220-12 slave modules. Simply press the modules together until they lock. In any multi-module configuration, the "L" and "S" ports on the final slave must be plugged for the system to maintain pressure.

Can I mix high-volume and low-volume modules in the same stack?
Yes, the C-2220 series allows for mixed configurations. However, the master module must be selected based on the specific requirements of the primary controller, and the appropriate low-volume input or high-volume input subordinate must be matched to its respective thermostat.

What is the maximum supply pressure for the C-2220-11?
The nominal supply pressure is 20 psig (140 kPa), with a maximum structural limit of 25 psig (175 kPa). Exceeding these limits can compromise the pneumatic signal repeaters within the module.

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.