Evaporator Heater Airflow Distribution (EHAD) Stand

The EHAD test system (Evaporator Heater Airflow Distribution) provides precision controlled and measured air, glycol and refrigeration to the inlet of an automotive HEB (heater, evaporator, blower) unit. Additional capabilities include power supply management to the unit under test.  Ideal for determining temperature control curves, airflow distribution through associated vents, heater performance and evaporator cooling performance.


  • Real time generation of temperature control curves and airflow distribution test graphs.
  • All supporting modules neatly and efficiently integrated into a stand alone package.  Minimizing floor space requirement, but allowing for ease in service and preventative maintenance.
  • Options available for automatic temperature control levels and dials.
  • Optional moveable airflow measurement system.
  • Data collection and computation through PLC based touch screen, also available through LabVIEW automation software packages


Airflow Range: 50 to 600 cfm
Airflow Temperature Range: -20°F to 140° F
Airflow Humidity Range: 10 to 90% RH
Product Pressure Range: ± 3” H20

Saturated Discharge Temperature: 90°F to 140°F (Typical)
Saturated Suction Temperature: 10°F to 40°F (Typical)

Flow: 0 to 10 gpm
Temperature Range: Ambient to 212°F

Power Supplies
Temperature Control Lever Actuation
Pulse w/ Modulation
Control: Fully automatic, PLC driven
Control Interface
LabVIEW® software with PC interface