Bard WA Series, User Manual, Page: 58 / 87

Manual 2100-720C
Page 34 of 42
TABLE 12
Recommended Airflow
FIGURE 27
Speed Taps
Speed Tap 1: Vent Speed
Speed Tap 2: Balanced Climate Speed
Speed Tap 3: Default Speed
Speed Tap 4: Medium Speed
Speed Tap 5: High Speed
Manual 2100-467H
Page 23 of 23
FIGURE 11
TROUBLESHOOTING GE X13-SERIES ECM2.3 ™ MOTORS
CONT’D.
Model X13 Communication Diagnostics
The X13 motor is communicated through 24 VAC low voltage
(Thermostat Control Circuit Wiring).
1. Start with unit wiring diagram to confirm proper
connections and voltage (see Figure 11).
2. Initiate a demand from the thermostat and check the
voltage between the common and the appropriate motor
terminal (1-5). ("G" input is typically on terminal #1, but
refer to wiring diagram!)
a. If the low voltage communication is not present, check
the demand from the thermostat. Also check the
output terminal and wire(s) from the terminal strip or
control relay(s) to the motor.
b. If the motor has proper high voltage as identified
above (Motor not Running #1), and proper low voltage
to a programmed terminal, and is not operating, the
motor is failed, and will require replacement.
24VAC "R" Sig nal thro ug h
thermo stat o utp ut.
24VAC Co mmo n
24VAC Co mmo n
24VAC "R" Sig nal thro ug h
thermo stat o utp ut.
24VAC Common
24VAC "R"
signal through
thermostat output
Model
Nominal
Rated
CFM*
Nominal
Rated
ESP*
Recommended
Airflow Range
Factory
Speed
Connection
W3SAC 1150 .15 1050 - 1350 Default
W4SAC 1550 .20 1450 - 1750 Default
W5SAC 1750 .20 1650 - 2000 Default
* Rated CFM and ESP on factory speed connection.
Setting Unit Airflow
The unit is set from the factory at the default speed.
Most units have three selectable cooling speed taps that
can be utilized. The default speed is the lowest cooling
speed. The two higher speed taps can be used for higher
duct static applications so that the unit can maintain the
recommended airflow as shown in Table 12. The higher
speeds can also be used when higher sensible cooling is
desired. To change to the higher speed taps, move the
orange/black wire on the blower speed terminal block to
either MED or HI. Refer to Table 14 on page 38 for the
corresponding airflow of each tap. Set the unit duct static
based on the highest airflow that the unit will run at.
NOTE:
Be sure to adjust the system static or blower
speed to maintain airflows above the minimum
recommendations to prevent freeze up conditions
if Balanced Climate mode is activated.
Do not operate the unit in Balanced Climate mode
if running high static applications as indicated in
the blower performance table. If Balanced Climate
mode is activated as described on page 18, the unit
will run in this mode at all times unless there is a
call for ventilation, electric heat or 2nd stage cooling
from a 2-stage thermostat. At that time, the unit will
automatically activate a higher speed tap.
Blower Speeds
The ECM motor blower speeds are communicated
through 24VAC low voltage signals from the low voltage
terminal block inside the control panel area to speed
taps. Each speed tap is programmed by Bard at the
factory to different motor torque settings (see Figure 27).
Unit
Operation
Thermostat Inputs – 24VAC Speed Taps
Blower Speed
Compressor
Operation
G Y1 Y2 Y3 W1 W2 A D 1 2 3-4-5
1
Blower Only X X Vent/Blower Only Off
Part Load Cool X X X X Balanced Climate On
Balanced Climate Cooling 3 X X X X X Balanced Climate On
Full Load Cool X X X X X X X Lo/Med/Hi On
1st Stage Heat X X Lo/Med/Hi Off
2nd Stage Heat X X X Lo/Med/Hi Off
Dehumidify
2
X X X Balanced Climate On
¹ Fan speed is selectable through the blower speed control terminal block. LO (default), MED or HI speeds can be used.
2 Dehumidification operation is disabled when a call for heating or cooling occurs. Unit runs at Balanced Climate speed
during dehumidification operation.
3
Y2-Y3 low voltage strip jumper must be removed.
TABLE 13
Blower Speeds for Unit Operational Modes
Five factory programmed speed taps (torque settings)
are available for the motor, and are selected through
different unit modes of operation. These modes are
energized by 24VAC signals from the low voltage
terminal block located inside the control panel by a
thermostat or other controlling device.
Multiple motor speed taps may be energized
simultaneously by 24VAC power during different modes
of operation. The highest number speed tap energized
takes priority with 5 being the highest and 1 being
the lowest. See Table 13 for the corresponding blower
speeds with the different modes of operation.