Manual 2100-695C
Page
30 of 56
6. Press UP or DOWN keys to change the value.
7. Press ENTER key to save value and move the
cursor to next parameter or top of screen.
8. Press ESCAPE key several times to return to Main
Menu screen.
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 LC, this is taken care of
by LC logic.
Compressor Low Temperature Limit
The unit has the ability to protect the compressor
from refrigerant flood-back in low outdoor temperature
conditions (0°F default). This will be automatically
enabled, unless the economizer is disabled by the
model number. This function can also be enabled/
disabled, and limit temp changed by the user.
To adjust compressor low temp 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
.
5. Press ENTER key to scroll to
Comp. Limit
(see
Figure 45).
6. Press UP or DOWN keys to change
ON
or
OFF
value.
7. Press ENTER key to save value and move the
cursor to
Cutoff Temp
.
8. Press UP or DOWN keys to adjust temperature.
9. Press ENTER key to save value.
10. Press ESCAPE key several times to return to Main
Menu screen.
Additional Compressor Alarms
Refrigerant Low Pressure Alarm
When the suction pressure transducer indicates a
pressure value below the low pressure alarm setpoint of
40 PSI and the compressor has been running for more
than 180 seconds, or the suction pressure is pulled
into a vacuum for more than 20 seconds, the controller
will disable the compressor.
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
3600 seconds (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
.
5. Press ENTER key to scroll to
Delay
to adjust how
long the compressor waits before turning the
compressor off (see Figure 46).
6. Press UP or DOWN keys to adjust the time delay.
7. Press ENTER key to scroll to
Two Count Delay
.
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 45
Adjusting Compressor Low Temp Limit
FIGURE 46
Adjusting Low Pressure Alarm Settings
Economizer
Economizer Components
Actuator
The actuator rotates up to 90° based on a 2-10v signal
sent to it by the controller. The actuator is rated at
90 in-lb and is spring return when power is lost. This
component is what opens and closes the damper blade.
