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FIGURE 40
Adjusting Compressor Delays
The address-based delay only applies to the wall-mount
unit when in orphan mode. The controller will delay the
unit compressor based on the value entered on screen
B2 multiplied by the unit address. This is intended to
keep multiple units from starting their compressors
at the same time when there is a quick change in the
load. When connected to the LV, this is taken care of by
LV logic.
Low Temperature Compressor Disable
The unit has the ability to protect the compressor
from refrigerant flood-back in low outdoor temperature
conditions (0°F default). This feature has three
operating modes:
•
Always: Always disables compressor operation
when outdoor temperatures fall below Cutoff Temp.
•
FC Only: Disables compressor operation only when
freecooling is available and outdoor temperatures
fall below Cutoff Temp.
•
Never: Never disables compressor operation
regardless of outdoor temperatures.
The default operating mode is set to FC Only. This
option will still allow compressor operation if it is the
only means of cooling the indoor space.
The limit temperature can also be changed by the user.
To adjust the compressor low temperature limit:
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 Adv System
Config; press ENTER key.
4. Press UP or DOWN keys to scroll to Compressor
Config B3; press ENTER key.
5. Press ENTER key to scroll to Comp. Limit (see
Figure 41).
6. Press UP or DOWN keys to change Comp. Limit
value.
7. Press ENTER key to save value and move cursor to
Cutoff Temp.
8. Press UP or DOWN keys to adjust the temperature.
Manual 2100-694B
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28 of 62
9. Press ENTER key to save.
10. Press ESCAPE key several times to return to Main
Menu screen.
FIGURE 41
Adjusting Low Temperature Compressor Disable
Additional Compressor Alarms
Refrigerant Low Pressure Alarm
When the suction 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 120-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 1 hour
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 42).
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.
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Troubleshooting
