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APPENDIX B — EVO/ECM 4-SPEED ADJUSTMENT
Adjusting the Flo1, Flo2, Flo3 potentiometers requires the
use of a multi-meter capable of measuring 0~5 vdc.
1. Only trained and qualified individuals should attempt to
adjust or service components on any electrical compo-
nent. Failure to follow safety rules could result in electri-
cal shock or hazard.
2. 24 vac power must be supplied to ECM board to make
adjustments.
3. Set the electrical multi-meter to volts direct current (vdc)
on the 0~5 or 0~20 vdc scale.
4. Attach black (negative) lead of meter to the “Com” termi-
nal to the left of the potentiometers and below the status
light.
5. Attach the red (positive) lead of the meter to the high
speed “Flo1” terminal below the potentiometer.
6. High Speed: Using a small screwdriver turn the Flo1 po-
tentiometer so the meter measures 4.51 vdc. This will set
the ECM speed to 90% of maximum for high speed oper-
ation.
7. Medium Speed: Using a small screwdriver turn the Flo2
potentiometer so the meter measures 3.53 vdc. This will
set the ECM speed to 70% of maximum speed for medi-
um speed operation.
8. Low Speed: Using a small screwdriver turn the Flo3 po-
tentiometer so the meter measures 2.06 vdc. This will set
the ECM speed to 40% of maximum speed for low speed
operation.
9. For setting of Flo0 and Flo4 contact Carrier, otherwise
these potentiometers should be set to full counter-clock-
wise rotation.
Fig. B — 4-Speed ECM
