Circulator Blower Speeds - Goodman xMEC96 Series User Manual

C B S
IRCULATOR LOWER PEEDS
This furnace is equipped with a multi-speed ECM motor. Two
wiring harnesses connect the motor to the integrated control
board and furnace power supply. The line voltage (115 VAC)
power supply to the motor is constant and not switched by the
control board. Motor operation is also dependent on a pulsing D.C. signal on one of the four speed taps on the motor. The
airflow tables for heating and cooling speeds show the relationship between airflow (CFM) and external static pressure for
each size furnace.
Circulator Blower Speed Facts
1. Motor speed Tap wiring must remain in factory position on the control board and motor.
2. There are 4 speed Tap wires to the motor T1, T2, T3, T4.
3. There are 5 speeds available, depending on DIP switch settings and found in air flow table for each size furnace.
4. T1 terminal is always energized for Low Heat / Constant Fan speed.
5. T2 terminal is always energized for High Heat speed.
6. T3 terminal is always energized in Low Cooling.
7. T4 terminal is always energized in High Cooling.
8. Heating input (W1/ W2) always has priority over all other thermostat input.
9. Cooling input (YLo/ Y) has priority over continuous fan input.
10. Continuous fan input (G) has lowest priority.
*The blower speed wiring connections must remain in factory position.
1. Refer to the air flow table for your specific model furnace
2. If a cooling or heat pump condensing unit is being used in conjunction with this furnace, the three DIP switches in
S2 are used to select the proper cooling speeds to match the outdoor unit size. Typical CFM requirements are 400
CFM / Ton.
1. Turn OFF power to the furnace.
2. Select the cooling blower speeds that match the installation requirements from the airflow table in this manual or the
Service Manual, If factory cooling speeds do not match the installation requirements, the dip switch settings must be
changed from factory position
3. Turn ON power to furnace.
4. Verify proper temperature rise in heat modes and CFM in cooling modes
T
O AVOID PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK
OFF
TURN POWER TO THE FURNACE BEFORE CHANGING SPEED TAPS
33
WARNING
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