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APPENDIX C — EVO/ECM 4-SPEED ADJUSTMENT
Fig. D — 4-Speed ECM
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” ter-
minal to the left of the potentiometers and below the sta-
tus 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
potentiometer so the meter measures 4.51 vdc. This will
set the ECM speed to 90% of maximum for high speed
operation.
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
medium speed operation.
8. Low Speed: Using a small screwdriver, turn the Flo3
potentiometer 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.
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