Setting Unit Airflow; Blower Speeds; Figure 27 Speed Taps; Table 13 Recommended Airflow - Bard W42AC-B Installation Instructions Manual

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
13. 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 15 on page 37 for the corresponding airflow of
each tap. Set the unit duct static based on the highest
airflow that the unit will run at.
TABLE 13
Recommended Airflow
Nominal Nominal
Model Rated Rated
CFM* ESP*
W42AC 1350 .15
W48AC 1550 .20
W60AC 1750 .20
W72AC 1900 .25
* Rated CFM and ESP on factory speed connection.
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
Unit
Operation
Blower Only
Balanced Climate Cooling
Full Load Cool
1st Stage Heat
2nd Stage Heat
Dehumidify
2
¹ Fan speed is selectable through the blower speed control terminal block. LO (default), MED or HI speeds can be used.
Dehumidification operation is disabled when a call for heating or cooling occurs. Unit runs at Balanced Climate speed
2
during dehumidification operation.
Factory
Recommended
Speed
Airflow Range
Connection
1250 - 1600
1450 - 1750
Default
1650 - 2000
1800 - 2100
TABLE 14
Blower Speeds for Unit Operational Modes
Thermostat Inputs – 24VAC
G Y1 Y2 W1 W2
X
X X
X X X
X
X X
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

Five factory programmed speed taps (torque settings)
are available for the motor, and are selected through
TROUBLESHOOTING GE X13-SERIES ECM2.3
different unit modes of operation. These modes are
energized by 24VAC signals from the low voltage
Model X13 Communication Diagnostics
The X13 motor is communicated through 24 VAC low voltage
terminal block located inside the control panel by a
(Thermostat Control Circuit Wiring).
1. Start with unit wiring diagram to confirm proper
thermostat or other controlling device. Each speed tap
connections and voltage (see Figure 11).
is programmed by Bard at the factory to different motor
torque settings (see Figure 27).
24VAC Common
24VAC Common
24VAC "R"
signal through
24VAC "R" Signal through
thermostat output.
thermostat output
Speed Tap 1: Vent Speed
Speed Tap 2: Balanced Climate Speed
Speed Tap 3: Default Speed
Speed Tap 4: Medium Speed 24VAC Common
Speed Tap 5: High Speed
24VAC "R" Signal through
Multiple motor speed taps may be energized
thermostat output.
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 14 for the corresponding blower
speeds with the different modes of operation.
Speed Taps
A D 1 2 3-4-5
X
X X
X X X
X
X
X X X
MOTORS
™
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.
FIGURE 27
Speed Taps
FIGURE 11
Manual
Page
Compressor
Blower Speed
Operation
1
Vent/Blower Only
Balanced Climate
Lo/Med/Hi
Lo/Med/Hi
Lo/Med/Hi
Balanced Climate
Manual 2100-692E
Page
CONT'D.
2100-467H
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