Manual 2100-725C
Page
12 of 39
mixed air alarm will need to be active for 120 seconds
before an alarm will be generated.
To adjust these values:
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
Sys Config
;
press ENTER key.
4. Press UP or DOWN keys to scroll to
Alarm Config
(A7)
; press ENTER key.
5. Press ENTER key to scroll to desired value
Diff Lo
,
Diff Hi
or
Del
(see Figure 16).
6. Press UP or DOWN keys to adjust value.
7. Press ENTER key to save.
Refrigerant Low Pressure
When the low pressure switch indicates a low pressure
condition and there is an active call for cooling, the
controller will generate an alarm (after a delay). The
delay used by the low pressure alarm is determined
by the outdoor air temperature (OAT on display). If the
outdoor air temperature is below 55°F, the delay is 180
seconds (LDel on display). If the outdoor temperature is
above 55°F, the delay is 120 seconds (Del on display).
The unit will also have an address-based delay that will
affect start up time; the default is 5 seconds multiplied
by unit address. (The unit address-based delay is
only when the unit is in orphan mode operation.)
Additionally, if the outdoor temperature sensor is not
used, the delay is set to 180 seconds. The controller
will try to run the refrigeration system two times before
the alarm will lock the compressor out.
If 15 minutes (Two Count Del value on display) passes
before the second attempt, the number of tries will be
reset.
To adjust these values:
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
Sys Config
;
press ENTER key.
4. Press UP or DOWN keys to scroll to
Alarm Config
(A7)
; press ENTER key.
5. Press ENTER key to scroll to desired value
OAT
,
Diff
,
Del
,
LDel
or
Two Count Del
(see Figure 16).
6. Press UP or DOWN keys to adjust value.
7. Press ENTER key to save.
Refrigerant High Pressure
When the wall-mount unit receives a signal from the
compressor control module (CCM) indicating a high
pressure event, the wall-mount unit will generate an
alarm. Upon receiving the alarm, the wall-mount unit
will remove the “Y” call from the CCM, resetting the
status of the CCM. The alarm will stay present on the
wall-mount unit until manually cleared. This operation
has no configurable parameters.
Economizer Damper
When the controller commands the economizer damper
actuator to a position other than 0% and the damper
switch indicates the damper is not open, after a delay
of 120 seconds (Open Del on display) the controller
will generate a damper failed to open alarm. When the
controller commands the economizer damper actuator
to the 0% position and the damper switch indicates
the damper is not closed, after a delay of 300 seconds
(Close Del on display) the controller will generate a
damper failed to close alarm.
To adjust these values:
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
Sys Config
;
press ENTER key.
4. Press UP or DOWN keys to scroll to
Alarm Config
(A8)
; press ENTER key.
5. Press ENTER key to scroll to desired value
Open
Del
or
Close Del
(see Figure 17).
FIGURE 17
Adjusting Damper Alarm Values
FIGURE 16
Adjusting Mixed Air Alarm Values
