Specific Systems Exterior Wall Mounted Cooling Unit , Packaged Rooftop Unit, Pressurization Unit, Air Stack

Specfic Systems Air Pak Series PLC Control Panel Multiplexors

Take control of your HVAC with our multiplexors

Many of our customers require N+1 redundancy for the HVAC on their buildings. 

Our multiplexor control panel is an option provided for applications that require 

multiple HVAC systems. This allows additional redundancy, often desired for 

unattended sites, and provides several standard services including:

Auto-sequencing between systems, based on 24-hr timer

Manual selection of any HVAC system in the circuit

Automatic dual-unit operation – High or low temperature condition

High Temperature Alarm – Form C dry contacts

The multiplexor is a microprocessor based PLC control panel for controlling multiple 

Specific Systems® units. If a failure of the main unit occurs (determined through use 

of multiple sensors inside each unit), the multiplexor automatically energizes 

another system to keep the area pressurized and can provide an audible or visible 

alarm to notify personnel of the failure.