Sequence of Operation
Multi-Speed Indoor Motor
Note: Multi-speed indoor fan available only on 6, 7.5 (dual compressor) & 8.5 tons high efficiency, and 10 ton products with ReliaTel™ controls.
Note: Multi-speed indoor fan standard for 17 Plus.
Models configured for the multi-speed indoor motor will be controlled via the 0-10 Vdc or PWC 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. Provisions have been made in Service TEST Mode to allow for maximum motor speed adjustment. Motor may be adjusted using modes listed
below. Reference the RPM table in the Performance Data section for fan speed.
1. TEST Mode Cool 2; 2-Step Cool applications only
2. TEST Mode Cool 3; 3-Step Cool applications only
Adjust R136 potentiometer clockwise to increase or counterclockwise to decrease motor speed.
Refer to the Fan Output% list below for supply fan output associated with each unit function:
Fan Output%
• Ventilation Only 50%
• Economizer Cooling 65%
• Cool 1 (C1 Energized) 65%
• Cool 2 (C1 + C2) 100% (2-Steps of Cooling)
• Cool 2 (C1 or C2) 65% (3-Steps of Cooling)
• Cool 3 (C1 + C2 Energized) 100%
• Dehumidification Fan Speeds and Enhanced 53%
• Heat 100%
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.