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English
Instal
lation
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 definitions. See blower tables in later section for airflow data.
When using optional electric heat kits, the heat kits will have a fan speed wire that will be connected to the fan motor on
speed tap 5 from the factory. Refer to the heat kit installation manual for minimum CFM for electric heat kit use before
adjusting this speed tap wire (speed tap 5 is recommended)
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 BLACK wire is high
(standard) speed. The WHITE wire is low (reduced) 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 (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
Default speed tap settings
AM0
12/24/30/48/54/60/72
TNZDCH
AM018TNZDCH
AM036TNZDCH
C
Speed tap common - 24 VAC 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
"LOW" speed
"LOW" speed
T2
Medium-low speed tap - 24 VAC input
"MID" speed
"LOW" speed
T3
Medium speed tap - 24 VAC input
"MID" speed
"MID" speed
T4
Medium-high speed tap - 24 VAC input
"HIGH" speed
"HIGH" speed
"HIGH" speed
T5
High speed tap - 24 VAC input
High speed for
electric heat
High speed for
electric heat
High speed for
electric heat
Motor control/voltage taps
Selecting motor speed
AM072TNZDCH_IM_DVM V-AHU_AA_EN_.indd 29
2020-02-14 오전 10:33:35
Summary of Contents for AM0 SERIES
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