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8. Press UP or DOWN keys to adjust the offset.
9. The update will not take effect until the cursor is
moved out of the Offset parameter.
FIGURE 26
Adjusting Suction Temperature Sensor Values
Suction Temperature Sensor Alarm
When the suction temperature sensor value is out of
range (-41.0 to 303.0°F), the controller will generate
a sensor failure alarm to indicate the sensor is not
working properly.
This alarm cannot be adjusted.
EEV Operation
EEV Superheat Control
The electronic expansion valve (EEV) will open or
close to maintain the superheat setpoint while the
compressor is running (see Table 5). When the
compressor is not running, the valve will close to the
20% open default position.
TABLE 5
Unit Specific Superheat Setpoints
Unit
W180B
Low superheat protection will be active once the
superheat value is at or below 5°F. At this point,
the control will aggressively close the valve so that
superheat is maintained.
Additional EEV Alarms
Low Superheat Alarm
This alarm will become active when the calculated
superheat goes below 5°F. This alarm will clear itself
when the condition is no longer present.
This alarm cannot be adjusted.
Superheat
12°F
Indoor Airflow
Indoor Airflow Components
Blower
The unit is equipped with a blower that is driven by an
electronically commutated motor (ECM). The blower
is controlled by a 0-100% signal through Modbus
communication. The motor controller converts this
signal to a PWM signal. The blower uses a 17.7" (450
mm) diameter wheel and operates up to 2300 rpm.
The blower output can be put into an override mode for
verification or troubleshooting.
To put the blower into override:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
TECHNICIAN password 1313.
3. Press UP or DOWN keys to scroll to I/O Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Fans / Blowers;
press ENTER key.
5. Press UP or DOWN keys to scroll to Blower 1 C5-1
or Blower 2 C5-2.
6. Press ENTER key to scroll to Blower Overrides?
(see Figure 27).
7. Press UP or DOWN key to change No to Go. The
override will begin and the screen will change to
the override screen (see Figure 27).
The override will last for 5 minutes or until the Blower
Overrides parameter is set to No again.
FIGURE 27
Putting Blower Output into Override Mode
Manual
2100-749
Page
19 of 68
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Troubleshooting
