Data Aire dap4 User Manual page 102

Alarm Screen Description &
Classification
*Warning
C1 or C2 Low Circuit
Pressure pressure is
under 50 PSI
(it will cut- in at
90 PSI)
** Urgent
C1 or C2 High Circuit
Pressure pressure is
over the
pressure
setting of
switch
** Urgent
Possible Causes
•
Maintenance timer has
not been reset
•
Not enough air flow
though evaporator coil
•
Low Indoor
Temperature
•
Dirty Filters
•
Low refrigerant charge
•
Inoperative Expansion
valve
•
Filter Drier clogged up
•
Restricted liquid line
•
Undersized lines
•
Inefficient Compressor
•
Incorrect settings on
the controller
•
High outdoor ambient
temperature
•
Recirculating of
condensing air
•
Low heat rejection at
condenser
•
Not enough air across
Condenser coil
102
Corrective Actions
Reset timer
•
Blower motor on low speed or
failed motor, High static
pressure, or undersized plenums
•
Raise the temperature above
68° degrees
•
Replace filters
•
Check sub-cooling, and test for
leaks. Repair leaks and add
refrigerant
•
Adjust and check valve
operation and replace if needed
•
Replace filter drier
•
Repair restriction
•
Check line design at IOM
•
Test compressor efficiency
•
Go to Menu L – Configure I/O
and change the Low Pressure
Switch action setting
•
Wait until ambient temperature
drops
•
Remove obstruction to air flow
•
Check condenser fan motor
operations on air cooled, check
water flow on water cooled.
•
Check condenser fan cut-in
temperatures, and clean
condenser coil if needed
•
Check blower speed