Selecting Motor Speed - Samsung AC***KNZDCH/AA Installation Manual

Selecting motor speed

Selecting the Constant Torque Blower Speed
This air handler uses a Constant Torque high efficiency 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 off 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 sufficient airflow for the size of the electric heat kit. Refer to the heat kit
installation manuals for minimum CFM for electric heat kit activation.
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 - 24 VAC
C
common
L Supply voltage - 240 VAC Line 1
G Ground connection
N/L2 Supply voltage - 240 VAC Line 2
T1 Low speed tap - 24 VAC input
Medium-low speed tap - 24
T2
VAC input
T3 Medium speed tap - 24 VAC input
Medium-high speed tap - 24
T4
VAC input
T5 High speed tap - 24 VAC input
Default speed tap settings
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
25
AC036/042KNZDCH/ AC048KNZDCH/
AA AA AA
"Low" speed "Low" speed
"Mid" speed
"Mid" speed
High speed for
"High" speed
electric heat
High speed for
"High" speed
electric heat
AC054KNZDCH/
AA
"Low" speed
"Mid" speed
High speed for
electric heat
"High" speed