WaterFurnace Versatec Base - Manual (Page 20)

20
VERSATEC BASE 50Hz SERIES INSTALLATION MANUAL
5-Speed ECM Constant 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 ECM 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 ECM motor is powered by line voltage but the
motor speed is energized by 24VAC.
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.