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P a g e
MCS – MicroMag Error / Alarm Manual
Version: 02/21/2020
The low suction pressure alarm will trip if the
suction pressure drops below the value of Setpoint
#62. If the compressor has low suction pressure, it
will lockout and display the LO SUC PSI alarm.
The unsafe suction pressure alarm will trip if the
suction pressure drops below the value of Setpoint
#64. This alarm warns of critically low suction
pressure and will lockout the compressor on that
circuit.
Note: Supervisor password (2112) is
required to reset lockouts
MicroMag Alarms
Possible Causes
Solutions
Sensor fault on suction
pressure
See Appendix B to troubleshoot
Liquid line
blocked/restricted
Check that all valves are open between the
condenser and TXV, and that filter dryer
(shown to the right) is not blocked
Ensure TXV is opening and is set properly
Lack of load/flow
Ensure y-strainer (shown to the right) and
process plumbing are free of blockages or
restrictions, and that all ball valves are opened
Ensure heat load is present
Setpoint #62 is incorrect
for operating conditions
Check with Drake, then change setpoint to a lower value
Defective TXV valve
Shut down system, fully backseat TXV (shown
to the right), then front-seat TXV. Set TXV back
to the operating position. If operating problems
persist, call Drake
Refrigerant charge is
low
Check for refrigerant leak
Contact Drake to determine the charge
Low / Unsafe
Suction Pressure
5
.
