Manual 2100-671
Page
17 of 44
5. Press UP or DOWN keys to scroll to
Blower 1
.
6. Press ENTER key to scroll to Blower
Overrides
?
(see Figure 22).
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 22).
The override will last for 5 minutes or until the
Fan
Overrides
parameter is set to
No
again.
EEV Operation
EEV Superheat Control
The electronic expansion valve (EEV) will open or close
to maintain 10° of superheat while the compressor is
running. When the compressor is not running, the valve
will close to the 20% open default position.
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.
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 on the W120AP
model uses a 22" (560 mm) diameter wheel and
operates between 550-1150 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.
FIGURE 21
Adjusting Evaporator Freeze Sensor Values
FIGURE 22
Putting Blower Output into Override Mode
TABLE 3
Rated Airflow
Nominal Rated CFM
Nominal Rated ESP
High
Low
W120AP
4000
2800
0.30
TABLE 4
Indoor Blower Performance
ESP
(Inch H
2
0)
Dry
Coil
Wet
Coil
W120AP
0.30
4160
3890
