Page
33 of 53
Suction Temperature 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.
Suction Pressure Alarm
When the suction pressure sensor value is out of range
(0-250 PSIG), the controller will generate a sensor
failure alarm to indicate the sensor is not working
properly.
This alarm cannot be adjusted.
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. This blower uses a 10" diameter
wheel operating between 250-1400 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
USER password 2000.
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 Fan
(C13)
; press ENTER key.
5. Press ENTER key to scroll to
Blower OV Speed
(see
Figure 2.16 on page 32).
6. Press UP or DOWN keys to adjust the speed to the
desired output (see Table 2.1 on page 34).
7. Press ENTER key to scroll to
Override
.
8. Press UP or DOWN key to change
Disabled
to
Enabled
.
9. Press ENTER key to save.
10. Press the ESCAPE key several times to return to
Main Menu screen.
EEV Alarms
Refrigerant Low Pressure Alarm
When the low pressure transducer indicates a pressure
value less than the low pressure alarm setpoint of
40 PSIG and there is an active call for cooling,
the controller will disable the compressor (after a
180-second delay).
NOTE:
The second call will be
delayed based on the delay off value mentioned in the
compressor section.
The controller will try to run the
refrigeration system two (2) times within 900 seconds
before the alarm will lock the compressor out. This
alarm needs to be manually cleared before compressor
operation will resume.
To adjust the low pressure alarm settings:
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
(A6)
; press ENTER key.
5. Press ENTER key to scroll to
Delay
to adjust how
long the compressor waits before turning the
compressor off (see Figure 2.15).
6. Press UP or DOWN keys to adjust the time delay.
7. Press ENTER key to scroll to
Two Count Del
.
8. Press UP or DOWN keys to adjust the delay value.
9. Press ENTER key to save.
10. Press the ESCAPE key several times to return to
Main Menu screen.
FIGURE 2.15
Adjusting Low Pressure Alarm Settings
