iO HVAC Controls ZP3-HCMS-ESP Three Zone (2H/2C) Zone Panel With EspiO HVAC Controls ZP3 HCMS ESP Three Zone (2H 2C) Zone Panel with ESP Our ESP zone panels integrate our 2 and 3 zone panels with our award winning ESP, Electronic Static Pressure, technology. Each panel comes with a static pressure sensor. As zone dampers open and close, the static pressure sensor continuously monitors the system static pressure. If the static pressure goes above the static pressure setpoint, the panel will send a signal to all non