The Johnson Controls AK-51642 is a pneumatic relay designed to select the lower of two temperature-derived pressure signals in a pneumatic control system. It is commonly used in building automation and HVAC applications where control logic requires modulation based on the lowest of two monitored temperatures, such as in dual-duct or multi-zone systems.
IN STOCK
Technical Specifications
- Model: AK-51642
- Type: Pneumatic low selector relay
- Function: Selects the lower of two input air pressure signals
- Input Signal Ports: Two (for dual pneumatic temperature inputs)
- Output Signal Port: One (matches lower of the two inputs)
- Main Air Supply Pressure: Typically 20 psi (regulated, dry air)
- Mounting: Panel or wall mount
- Connections: Barbed or compression fittings for standard pneumatic tubing
Key Features
- Selects and transmits the lower of two pneumatic input signals
- Enables logic-based control in multi-temperature or multi-zone systems
- Compact design for easy integration into control panels or terminal boxes
- Passive, air-powered operation—no external power required
- Reliable mechanical operation with no electrical components
Compatible Components & Accessories
- Pneumatic thermostats and transmitters
- Johnson Controls pneumatic control panels
- Actuators and receiver-controllers
- Air line tubing, tees, and fittings
Industry Applications
- Dual-duct HVAC systems
- Multi-zone temperature averaging or comparison control
- Energy management systems
- Pneumatic logic circuits in commercial and institutional buildings
Installation & Maintenance Notes
- Mount securely on a stable panel or surface near the control zone
- Connect input tubing to two separate pneumatic temperature sources
- Output line should be routed to the next control stage (e.g., actuator or controller)
- Use dry, filtered air at regulated pressure to ensure consistent operation
- Periodically inspect for tubing leaks, clogging, or pressure drift
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