What should I look for in pneumatic controls?
- Pneumatic thermostats and controllers: Match the control action, direct-acting or reverse-acting, to your system sequence and connected actuators. Then, verify the temperature sensing range and choose the right mounting style, such as wall-mount, duct-mount, or insertion.
- EP and PE relays: Confirm voltage compatibility for EP relays, including common inputs like 24VAC and 120VAC. Verify the output pressure range matches your pneumatic actuator requirements. For PE relays, check the input pressure range and whether the output signal is voltage or current.
- Compressed air fittings and tubing: Select fittings with thread sizes and connection types that match your existing pneumatic network — brass compression fittings and push-to-connect barbs are common choices.
- Retrofit planning: When transitioning from pneumatic to DDC controls, identify which actuators and valves can remain functional with EP/PE relay interfaces versus which components need full replacement.
Can I use pneumatic controls alongside DDC systems in the same building?
Yes, hybrid configurations are common during phased retrofits or in facilities with mixed-age infrastructure. EP and PE relays serve as interface devices, allowing DDC controllers to command pneumatic actuators or trigger inputs based on pneumatic valve position. This approach extends the life of functional components and adds centralized monitoring to your building automation system. Contact us to discuss hybrid system components for your facility.
How do I size a pneumatic actuator for my application?
Actuator selection depends on the torque required to move your damper or valve, plus the system pressure available. Calculate the torque demand based on your damper's area and seal tightness, then match it to an actuator's rated output. Spring-return pneumatic actuators need sufficient pressure to overcome spring force, so confirm your supply pressure meets the minimum specification. Our technical solutions team can help size actuators for your application.
Where can I find pneumatic parts for older HVAC systems?
Contact our team with your part number, manufacturer, and application details. We maintain inventory across multiple manufacturers and can help identify suitable replacements that integrate with your pneumatic network. Our team provides guidance on compatibility and installation for legacy system components.
Need Help Sourcing the Right Part? Finding the right pneumatic component for legacy systems can be challenging. Whether you need a specific part number or guidance on compatibility, contact us and our team will help you source the components your system requires.
