Manual 2100-695C
Page
20 of 56
8. Press UP or DOWN keys to change to the desired
Alarm Delay
value.
9. Press ENTER key to save the value.
EEV Operation
EEV Superheat Control
The electronic expansion valve (EEV) will modulate to
maintain a specific superheat (see Table 4) while the
compressor is running. When the compressor is not
running, the valve will open to 40% to allow system
equalization.
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).
6. Press UP or DOWN key to change
OFF
to
ON
.
7. Press ENTER key to scroll to
OV Speed
.
8. Press UP or DOWN keys to adjust the speed to the
desired output. See Table 5A, 5B or 5C.
9. Press ENTER key to save.
NOTE:
If unit is operating at the time the blower
override is being enabled, adjustments must be
made to
OV Speed
first before switching
Blower
Override
on.
FIGURE 30
Adjusting Freeze Setpoint and Alarm Delay
FIGURE 31
Putting Blower Output into Override Mode
TABLE 4
Unit Specific Superheat Settings
Unit Size
Static Pressure
WR35
11°F
WR36
11°F
WR58
12°F
