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Using EC Max to replace Constant Torque ECM with 24vac speed taps.
• Install motor in HVAC system using a belly band mount.
• Select the voltage plug that matches the voltage rating of the replaced motor.
Install the voltage plug. Connect the harness plugs to the motor.
White Voltage Plug
115vac Systems
Yellow Voltage Plug
230vac Systems
• HIGH VOLTAGE POWER CONNECTIONS
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Note: The Black and White HIGH VOLTAGE POWER wires are taped together and
flagged for identification.
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Connect the Black HIGH VOLTAGE POWER wire to a L1 line voltage power
source that is continuously powered when the unit disconnect is closed.
◦
Connect the White HIGH VOLTAGE POWER wire to a Neutral (115vac
systems) or L2 (230vac systems) that is continuously powered when the
unit disconnect is closed.
◦
Note: These wires can be connected to the same terminals the Constant Torque ECM
used for line voltage inputs.
• HIGH VOLTAGE SIGNAL CONNECTION
◦
Note: The Black and Red HIGH VOLTAGE SIGNAL wires are taped together and flagged
for identification.
◦
Connect the Red (HV2) HIGH VOLTAGE SIGNAL wire to a L1 line voltage
power source that is continuously powered when the unit disconnect is
closed. This wire can be connected to the same L1 source as the Black
HIGH VOLTAGE POWER wire in the previous step.
◦
Insulate the Black (HV1) HIGH VOLTAGE SIGNAL wire with a wire nut.
◦
Note: This wire can be connected to the same terminal as the L1 HIGH VOLTAGE
POWER connection in the previous step.
• LOW VOLTAGE SIGNAL CONNECTIONS
◦
Note: All LOW VOLTAGE SIGNAL wires are taped together and flagged for
identification.
◦
Connect the Blue LOW VOLTAGE SIGNAL wire to the (C) terminal used by
the motor that was removed or to the thermostat common terminal or to
the common side of the 24vac transformer.
◦
Connect the speed desired for HEAT to the 24vac HEAT terminal and the
speed desired for COOL (including A/C or Heat Pump systems) to the
24vac COOL Terminal used by the motor that was removed.
◦
If the system has a 24vac Continuous Fan terminal connect any unused
speed to this terminal if desired.
• NOTE:
◦
After completing all connections, the technician should operate the system in all
demand modes measuring airflow using industry best practices. To adjust the
airflow, change the speed selection connected to the appropriate demand terminal.
