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Freezestat
Earlier units were equipped with a switch that
monitored the temperature of the refrigerant line
leaving the evaporator coil. To prevent the coil from
freezing and potentially allowing liquid refrigerant from
the evaporator to enter the compressor, the freezestat
switch was designed to open when the temperature at
this sensor is between 26.5°F and 37.5°F and close
again when the temperature is between 49.5°F and
64.5°F. This switch was used in units running software
version 1.0.4 and earlier and has been removed.
The evaporator coil freeze protection alarm is now
calculated using system temperatures (see Evaporator
Freeze Condition Alarm on page 18).
Indoor Airflow Operation
Blower Speed Control
The blower is capable of changing speeds to best match
the requirements of the system depending on which
mode the system is in (see Tables 6A, 6B or 6C on
pages 19 or 20).
The unit will automatically switch to the required
speed for each mode. High sensible mode and
dehumidification mode are both communicated
separately from the LV. For more information on the
high sensible command from LV, please see LV1000
Service Instructions 2100-673.
Additional Indoor Airflow Alarms
Supply Air Temperature Alarm
When the supply air 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 is fixed and cannot be adjusted.
Condenser Fan
Condenser Fan Components
Condenser Fan
The unit is equipped with a condenser fan that is driven
by an electronically commutated motor (ECM). This
fan is controlled by a 0-10vdc signal provided from the
controller. The fan operates between 100-1200 rpm.
To view the output of the condenser fan:
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 Condenser Fan
C14; press ENTER key.
5. Reference Fan Speed parameter for the current
output to the condenser fan (see Figure 34).
FIGURE 34
Verifying Condenser Fan Output
If required, the condenser fan output can be manually
set for 5 minutes for troubleshooting purposes.
While looking at Condenser Fan C14 screen:
1. Press ENTER key to scroll to Fan OV Speed (see
Figure 34).
2. Press UP or DOWN keys to change the value to the
desired override speed.
3. Press ENTER key to save the value and move
cursor to the Override parameter.
4. Press UP or DOWN keys to change the value from
Off to On.
5. The fan should now run at the selected speed. The
output can be verified by again referencing the Fan
Speed parameter.
The override will last for 5 minutes or until the Override
parameter is set to Off again.
Due to design considerations of the condenser section
of the wall-mount unit, placement/clearance of the
motor/fan blade is critical to heat dispersal. Should a
change of motor or fan blade be necessary, see Figure
35 for proper clearance adjustment.
FIGURE 35
Fan Blade Setting
(from the closest point on the fan blade)
.75"
Manual 2100-694B
Page
23 of 62
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Table of Contents
Troubleshooting
