Samsung AHU Series Service Manual

Also see for AC018JXADCH/AA: Service manual Service manual Service manual Service manual Service manual

TroubleshootingSamsung Electronics 4-15Selecting motor speedSelecting the Constant Torque Blower SpeedThis air handler uses a Constant Torque high eciency motor. This motor operates on 240 VAC. The motor speedtaps are 24 VAC, 0.03 amps, 60 Hz, 1 PH. The speed taps can be adjusted according to installation needs. Table 4shows the motor lead connection labeling and the connection denitions. See blower tables in later section forairow data.Total 24 VAC circuit amps are 0.14 amps.Change Motor Speeds1. Turn o all electrical supply circuits to the air handler at the main service (House Circuit Breaker) panel.2. Remove the blower door and switch air handler circuit breaker(s) to “OFF”.3. Disconnect the wire from the isolation relay terminal and reconnect the desired wire to the terminal. The REDwire is high speed. The VIOLET wire is mid speed. The GREEN wire is low speed. The ORANGE wire is electricheat high fan speed. The ORANGE wire must be connected to a speed tap that will provide sucient airow forthe size of the electric heat kit. Refer to the heat kit installation manuals for minimum CFM for electric heat kitactivation (usually speed tap 5).4. Turn the circuit breakers on and reinstall air handler blower door.5. Turn on all electrical supply circuits to the air handler at the main service (House Circuit Breaker) panel.6. When black wire(Standard) is required to be connected to tap 5, the orange wire which originally is connectedto tap 5 can be connected to any tap except tap 5.Terminal ConnectionDefault speed tap settingsAC018KNZDCH/AAAC024KNZDCH/AAAC030KNZDCH/AAAC036/042KNZDCH/AAAC048KNZDCH/AAAC054KNZDCH/AAC Speed tap common -24 VAC commonL Supply voltage -240 VAC Line 1G Ground connectionN/L2 Supply voltage -240 VAC Line 2T1 Low speed tap -24 VAC input "Low" speed "Low" speed "Low" speed "Low" speed "Low" speedT2 Medium-low speed tap -24 VAC input "Low" speed "Mid" speed "Mid" speed "Mid" speed "Mid" speedT3 Medium speed tap -24 VAC input "Mid" speed "High" speedT4 Medium-high speed tap -24 VAC input "High" speed " "High" speed High speed forelectric heat "High" speed High speed forelectric heatT5 High speed tap -24 VAC inputHigh speed forelectric heatHigh speed forelectric heatHigh speed forelectric heat "High" speed High speed forelectric heat "High" speedMotor control/voltage tapsAll manuals and user guides at all-guides.com