40
VersiVent Energy Recovery Ventilator
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.
1. When the wheel is spinning, the contact in the
rotation sensor is closed and the small LED light on
the sensor in ON.
2. 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.
3. 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
1
⁄
2
turns counter
clockwise. The sensor is not properly set, re-install
the adjustment plug.
4. 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
1
⁄
8
inch from the wheel. Verify that the
sensor depth was set using the appropriate gauge.
When the wheel is unplugged and the unit is still
powered on:
5. The LED should stay on for 10-20 seconds and then
turn off.
Troubleshooting - Digital Scroll
Compressor Controller (PDX Only)
The Fault Code chart is printed on the back of the
controller. Note that if the controller generates either a
Code 2 or a Code 4 Lockout, a manual reset must be
performed. Manual Reset is accomplished by shutting
off main power to the unit and then turning it back on.
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
microprocessor for an
alarm condition. If it is in
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 microprocessor. Refer to the
microprocessor controller Installation Operation and
Maintenance manual for detailed information on fault
codes and see the unit-specific wiring diagram.
Phase Monitor
The phase monitor has two LED
indicator lights, one red and one
green. Green indicates proper
operational status, red indicates the
unit has detected a fault and is in
alarm condition.
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.
FX05 Furnace Controller
Present only if an indirect gas-fired furnace option is
present.
The FX05 furnace controller
will display an alarm condition
if present. The controller
will be found in the furnace
control center. See the furnace
Installation, Operation and
Maintenance manual and the controller manufacturer’s
unit-specific manual for further information.
Digital Compressor Controller Fault Codes
Alert
Code
System
Condition
Diagnostic
Alert Light
Action
Code 2*
High discharge
temp trip
Blinks 2 times
Lockout
Code 3
Compressor
protector trip
Blinks 3 times
Lockout
Code 4*
Locked rotor
Blinks 4 times
Lockout
Code 5
Demand signal
loss
Blinks 5 times
Lockout
Code 6
Discharge
thermistor fault
Blinks 6 times
Reduce
capacity
Code 7
Future
N/A
N/A
Code 8
Welded
contactor
Blinks 8 times
Unload
compressor
Code 9
Low voltage
Blinks 9 times
Trip
compressor
* Protective faults that require manual reset
