Eev Operation; Eev Superheat Control; Additional Eev Alarms; Low Superheat Alarm - Bard FUSION-TEC WR36BPA Service Instructions Manual

reset hold time (5 minutes factory default), normal
operation will continue.
To adjust the freeze setpoint and/or alarm delay time:
1. Press MENU key to go to the Main Menu screen.
2. Press UP or DOWN keys and ENTER key to enter
USER password 2000.
3. Press UP or DOWN keys to scroll to System Config;
press ENTER key.
4. Press UP or DOWN keys to scroll to Alarm Setup
A7.
5. Press ENTER key to scroll to Alarm Setpoint (see
Figure 30).
6. Press UP or DOWN keys to change to the desired
value.
7. Press ENTER key to save the value and move
cursor to Alarm Delay.
8. Press UP or DOWN keys to change to the desired
Alarm Delay value.
9. Press ENTER key to save the value.
FIGURE 30
Adjusting Freeze Setpoint and Alarm Delay

EEV Operation

EEV Superheat Control

The electronic expansion valve (EEV) will modulate to
maintain a specific superheat (see Table 3) while the
compressor is running. When the compressor is not
running, the valve will open to 40% to allow system
equalization.
TABLE 3
Unit Specific Superheat Settings
Unit Size
WR36
WR58
Superheat
11°F
12°F
There are two forms of low superheat protection on
the FUSION-TEC WR Series units. One form will be
active once the superheat value is at or below 5°F. At
this point, the control will aggressively close the valve
to prevent flood back. The second form occurs at low
ambient temperatures. This control will slightly raise
the superheat setpoint based on outdoor temperature to
prevent system instability.

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.
Indoor Airflow
Indoor Airflow Components

Blower

The unit is equipped with a blower that is driven by
an electronically commutated motor (ECM). This
blower is controlled by a 0-10v signal provided from
the controller. This 0-10v signal is converted to a
PWM signal with an adapter. The blowers on both the
WR36BP* and WR58BP* models use a 10" diameter
wheel. The WR36BP* operates between 250-850 rpm
while the WR58BP* operates between 250-1400 rpm.
The blower output can be put into an override mode for
verification or troubleshooting. The override will last for
5 minutes or until the Blower Override parameter is set
to OFF again.
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 Blower Output
C12.
5. Press ENTER key to scroll to Blower Override (see
Figure 31).
FIGURE 31
Putting Blower Output into Override Mode
Manual 2100-695
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