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Marvair Scholar 2.0 I&S Manual 04/2022 Rev.2
Fresh Air Ventilation Points
Test #
1
2
3
4
5
Intake Vent Motor %
0
20
40
50
63
Airflow Measure (CFM)
0
125
265
345
450
Airflow Measurement (CFM) vs Intake Vent Motor Setting (%)
C. GreenCube® ERV. Using best industry standards and practices, measure the fresh
air that is being brought into the classroom. For units with one speed controller (std.),
adjust the speed of the intake and exhaust blowers by inserting a slotted screw
driver into the opening on the controller. The speed controller is located in the control
box. Measure the intake air again and adjust the speed of the blowers. Repeat as
necessary to meet the fresh air requirements.
3.02 PLC CONTROL ADJUSTMENTS
A. Scholar 2.0 Heat Pump and Air Conditioner PLC (Programmable Logic
Controller) Microprocessor.
Essential to the operation of the Scholar 2.0 heat
pump and air conditioner is a factory installed PLC microprocessor. The PLC
controller improves reliability due to a reduction of components and simplification of
the control panel wiring. The PLC is able to:
• Provide various control functions
• Show operational status through the HMI display and LED’s
• Assist in troubleshooting
• Perform extensive self diagnosis and indicate a fault
• Store statistical operational data
• Be programmed via USB/RS-495 cable or with a removable program storage
device
The PLC is factory wired and tested and typically no adjustments or changes are
required to the PLC when the Scholar 2.0 heat pump or air conditioner is installed.
B. Location
The PLC is located in the unit control center. Open the front door and remove the
cover to the control center.
Navigating The PLC Screen
Figure 11. Keys and LEDs
