York 33p502-05 Installation Manual page 25

5-Speed ECM Contant Torque Motors
The 5-speed ECM is a 'Constant Torque' ECM motor and delivers
air flow similar to a PSC but operates as efficiently as an variable
speed ECM motor. Because it's an ECM Motor, the 5-speed ECM
can ramp slowly up or down like the variable speed ECM motor.
There are 5 possible speed taps available on the 5-speed motor
with #1 being the lowest airflow and #5 being the highest airflow.
These speed selections are preset at the time of manufacture and
are easily changed in the field if necessary.
5-Speed ECM Benefits:
- High efficiency
- Soft start
- 5 speeds with up to 4 speeds on-line
- Built in logic allows air flow to change with G, Y1, Y2
and W signals
- Super efficient low airflow continuous blower
setting (G)
If more than one tap are energized at the same time, built in logic
gives precedence to the highest tap number and allows air flow
to change with G, Y1, Y2 and W signals. Each of those 5 speeds
has a specific 'Torque' value programmed into the motor for each
speed selection. As static pressure increases, airflow decreases
resulting in less torque on the rotor. The motor responds only to
changes in torque and adjusts its speed accordingly.
The 5-speed motor is powered by line voltage but the motor speed
is energized by 24VAC.
Power Connection - 3/16 in. quick connects - Line 1 (orange wire)
to L, Ground (green wire) to G, Line 2 (for 208V-230V units) to N
(brown wire).
LX ULTRA SERIES INSTALLATION MANUAL
Signal Connection - 1/4 in. quick connects - Common to C, 24VAC
to Taps #1-5.
Applying 24VAC power between any of the motor taps 1-5 (1/4
in. quick connects) and common will signal the motor to run and
regulate torque at the programmed level. The tap input voltage must
be in the range 12-33VAC. The 5-speed ECM will have less variation
over the operating static pressure range versus a PSC motor as well
as a significant watts reduction due to the high motor efficiency.
Thermal Protection - Motor is electronically protected.
Locked Rotor Amps - If motor speed decreases below a
programmed stall speed, the motor will shut down and after a
delay period, the control will attempt to restart the motor.
The 5-speed ECM speed tap selections are as follows:
The blue wire should be placed on the speed tap desired for the (G)
continuous blower setting – factory wired to Tap 1.
The red wire should be placed on the speed tap desired during
compressor operation (Y1 signal) – factory wired to Tap 3 or 4.
The gray wire is not factory wired to the motor and is tied to the wire
harness. It is field connected and can be used with 3ht/2cl thermostats
or IntelliZone to deliver the required air flow for the Y2 signal.
The tan wire should be placed on the speed tap desired for
auxiliary heat (W signal) – factory wired to Tap 5.
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