Samsung AHU Series Service Manual page 47

Selecting motor speed
Selecting the Constant Torque Blower Speed
This air handler uses a Constant Torque high eciency motor. This motor operates on 240 VAC. The motor speed
taps are 24 VAC, 0.03 amps, 60 Hz, 1 PH. The speed taps can be adjusted according to installation needs. Table 4
shows the motor lead connection labeling and the connection denitions. See blower tables in later section for
airow data.
Total 24 VAC circuit amps are 0.14 amps.
Change Motor Speeds
1. 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 RED
wire is high speed. The VIOLET wire is mid speed. The GREEN wire is low speed. The ORANGE wire is electric
heat high fan speed. The ORANGE wire must be connected to a speed tap that will provide sucient airow for
the size of the electric heat kit. Refer to the heat kit installation manuals for minimum CFM for electric heat kit
activation (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 connected
to tap 5 can be connected to any tap except tap 5.
Terminal Connection
Speed tap common -
C
24 VAC common
Supply voltage -
L
240 VAC Line 1
G Ground connection
Supply voltage -
N/L2
240 VAC Line 2
Low speed tap -
T1
24 VAC input
Medium-low speed tap -
T2
24 VAC input
Medium speed tap -
T3
24 VAC input
Medium-high speed tap -
T4
24 VAC input
High speed tap -
T5
24 VAC input
Samsung Electronics
All manuals and user guides at all-guides.com
AC018KNZDCH/ AC024KNZDCH/ AC030KNZDCH/
AA AA
"Low" speed "Low" speed
"Low" speed "Mid" speed "Mid" speed
"Mid" speed "High" speed
"High" speed " "High" speed
High speed for High speed for High speed for
electric heat electric heat electric heat
Motor control/voltage taps
Default speed tap settings
AC036/042KNZDCH/ AC048KNZDCH/
AA AA
"Low" speed "Low" speed
"Mid" speed
High speed for
"High" speed
electric heat
High speed for
"High" speed
electric heat
Troubleshooting
AC054KNZDCH/
AA AA
"Low" speed
"Mid" speed
High speed for
electric heat
"High" speed
4-15