Precedent 6-10 ton 14 SEER SZVAV unit adjusting the Indoor Fan Supply Output
Supply Fan Output Control
- Units configured for Single Zone VAV will be controlled via the 0-10Vdc Indoor Fan Speed output located on the RTOM. R136 (DA COOL_FAN SPD) potentiometer on the RTOM sets the maximum motor speed. Note that the potentiometer voltage readings can be verified via 2-position harness connector located adjacent to the RTOM. The unit schematic will illustrate the exact location. Use a DC voltmeter to read the voltage between the two terminals. Reference the RPM table in the Performance Data section for fan speed.
Adjusting:
- Use Service TEST Mode to adjust maximum motor
speed using modes listed below.
- TEST Mode Cool 2; 2-Step Cool applications only
- TEST Mode Cool 3; 3-Step Cool applications only
- Adjust DA COOL_FAN SPD potentiometer clockwise to increase or counterclockwise to decrease motor speed.
- The control will scale the 0-10Vdc output from the RTOM linearly to control between the 50%-100%
controllable range based on the space cooling demand.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.