87•dap4UserManual
d. Alarm relay energizes when this alarm is active.
e. Optional compressor lock-out on high suction temperature alarm can be enable in
menu K- alarm and limits of dap4. The default setting is “disable”. If enable, when
alarm counts match the programmed Lock-out times the compressor will be locked
out until it is manually reset by pressing the alarm button while alarm message
appears on screen.
ii Variable speed compressor’s low suction pressure alarm.
a. The variable speed compressors’ low suction pressure cut-out setpoint is default to
90 psi (range is 85 to 110 psi) and suction pressure deadband at 5 psi (range from 1
to 10 psi).
b. Compressor is shut down during this alarm and a low suction pressure alarm
message will display on dap4 when suction pressure drops below the low suction
pressure setpoint and C1 has been running for 3 minutes. The variable speed
compressor will automatically cycle on when its suction pressure rises above cut-out
pressure limit plus suction pressure deadband but it cannot violate the compressor
short cycle time delay and allowable reset times mentioned in section (c) below.
c. Optional compressor lock-out on Low suction pressure alarm with manual reset can
be enable in menu K- alarm and limits of dap4. The default setting is “disable”. If
enabled, when alarm counts match the programmed Lock-out times the compressor
will be locked out until it is manually reset by pressing the alarm button while alarm
message appears on screen.
iii If discharge temperature sensor is installed, low discharge temperature setpoint to turn off
compressor when the alarm is enabled and discharge temperature go below the low
discharge temperature limit setpoint.
iv EEV’s critical alarms shut down the compressor until the alarms are cleared. The following
EEV critical alarms will cause the variable speed compressor to shut down:
- EEPROM error
- Sensor errors (S1 to S4 depending on single/dual)
- Motor errors
- EEV Module not detected (when communication between the dap4 and EVD driver
is lost)
- Low Superheat (note: we will set the setpoint at 2°F on the EVD)
High Evap. Temp alarm:
- High Evap. Temp (MOP alarm) alarm that is detected by EEV driver will display but
will not shut the compressor down.
v If the super heat is over 34°F for over 30 seconds, “Superheat is over 34°F” message will
display. If the super heat is over 50°F for over 30 seconds, “Superheat is over 50°F” alarm
message will display and the compressor will shut down. Compressor will come back and
alarm message will disappear when superheat is below 30°F.
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