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Troubleshooting - Energy Wheel
Symptom
Possible Cause
Air seals are too tight.
Energy wheel
does NOT turn
Broken belt.
No power to wheel motor.
Energy wheel
Wheel motor overloads are tripping due
runs intermittently
to rubbing between wheel and air seals.
Always have a completed Pre-Start-Up Checklist and Start-Up Checklist prior to requesting parts or service
information.
Troubleshooting - Controller Alarms
The first step in troubleshooting the unit is to check
the on-board alarm indicators. Several of the electronic
controls in the unit monitor the system for faults and will
go into alarm, shutting down the unit or a single function
within the unit.
Microprocessor Controller
Check the screen on
the controller for an
alarm condition. If the
controller is in an alarm
condition, a message
will show on the screen.
The microprocessor controller is located in the main
control center. If it is in alarm condition, the alarm button
will blink red. Press the alarm button to see the specific
condition or to reset the controller.
Refer to the microprocessor controllers' Installation
Operation and Maintenance manual for detailed
information on fault codes and see the unit-specific
wiring diagram.
Variable Frequency Drive (VFD)
VFDs have a display screen that will show an alarm
condition. If a fault such as a voltage
spike occurs, the VFD will go into
alarm and will not reset until a hard
restart is performed. See the unit-
specific manufacturer's manual
supplied with the unit. VFDs are
located in the main control center.
®
Corrective Action
Refer to Adjust the Air Seals found in the Components Start-
Up section.
Replace.
Make sure wheel drive is plugged in. Verify power is available.
Recheck air seals, make sure they are not too tight. See
Adjust the Air Seals found in the Components Start-Up
section.
Troubleshooting - Rotation Sensor
When the unit is first turned on, the LED on the back of
the sensor should turn on and stay on with the wheel
running.
• When the wheel is spinning, the contact in the
rotation sensor is closed and the small LED light on
the sensor in ON.
• When the wheel is stopped there is a 10-20 second
delay before the sensor will indicate no rotation.
When the sensor indicates no rotation, it opens the
internal contact and the LED light of OFF.
• If the LED comes on and then shuts off after 5
seconds or less, the sensor is NOT properly set.
Remove the adjustment plug and turn the adjustment
screw clockwise until a slight stop is felt. Then
turn the adjustment screw out 15
clockwise. The sensor is not properly set, re-install
the adjustment plug.
• If the LED comes on and then shuts off after 10-20
seconds, the sensor is properly set although it is
either to close to the wheel or not close enough.
It should be
⁄
inch from the wheel. Verify that the
1
8
sensor depth was set using the appropriate gauge.
When the wheel is unplugged and the unit is still
powered on:
• The LED should stay on for 10-20 seconds and then
turn off.
Model APEX Energy Recovery Ventilator
⁄
turns counter
1
2
27
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