Frequently Asked Questions:
 

• What is the AAON ASM01891 Head Pressure Control Module used for?
  The AAON ASM01891 is used to control condenser fan or water valve operation in commercial HVAC systems. It helps maintain proper refrigerant head pressure for stable cooling performance. 

• How many condenser outputs can the ASM01891 control?
  The ASM01891 is designed to control two condenser outputs, making it suitable for HVAC systems with two condenser sections.

• How many pressure transducers can the AAON ASM01891 monitor?
  The module can monitor up to four head pressure transducers, allowing it to respond to system pressure changes accurately.

• Can the AAON ASM01891 operate as a standalone control?
  Yes. The ASM01891 can operate as a standalone head pressure control module or work with compatible AAON E-BUS controllers.

• What output signals does the ASM01891 support?
  The module supports PWM and analog output signals, giving technicians flexible options for condenser fan speed control or valve modulation.

• Does the ASM01891 help improve HVAC efficiency?
  Yes. By adjusting condenser operation based on pressure conditions, the module can help improve system efficiency, reduce unnecessary fan operation, and support reliable cooling performance.

• Does the AAON ASM01891 include diagnostic indicators
  Yes. The module includes built-in diagnostic LEDs that help technicians verify operation, monitor system status, and troubleshoot issues more easily.