Diagnostic Alarm Codes And Possible; Causes - Carrier AQUASNAP 30RB060-390 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Alarm Descriptor
Alarm Prefix
A1 – Compressor A1 Failure
A2 – Compressor A2 Failure
A3 – Compressor A3 Failure
A4 – Compressor A4 Failure
B1 – Compressor B1 Failure
B2 – Compressor B2 Failure
B3 – Compressor B3 Failure
B4 – Compressor B4 Failure
C1 – Compressor C1 Failure
C2 – Compressor C2 Failure
C3 – Compressor C3 Failure
C4 – Compressor C4 Failure
Co – Communication Failure
FC – Factory Configuration Error
MC – Master Chiller Configuration Error
P – Process Failure
Pr – Pressure Transducer Failure
Sr – Service Notification
th – Thermistor Failure
Alarm Suffix
Code Number to identify source
Fig. 33 — Alarm Description
DIAGNOSTIC ALARM

CAUSES

Motor Temperature Too High
A1.01 — Compressor A1
A2.01 — Compressor A2
A3.01 — Compressor A3
A4.01 — Compressor A4
B1.01 — Compressor B1
B2.01 — Compressor B2
B3.01 — Compressor B3
B4.01 — Compressor B4
C1.01 — Compressor C1
C2.01 — Compressor C2
C3.01 — Compressor C3
C4.01 — Compressor C4
Criteria for Trip — The alarm criterion is checked whether the
compressor is ON or OFF. This alarm will be generated if the
scroll protection module (SPM) detects a compressor motor
PTC (positive temperature coefficient) resistance greater than
4.5 k, indicating that the motor temperature is too high.
Action to be Taken — The circuit shuts down immediately or is
not allowed to start.
Reset Method — Manual. PTC resistance must be less than
2.5 k
Possible Causes — If this condition is encountered, check the
following items:
• Check for a PTC thermistor failure.
• Check for a compressor motor failure.
• Check for a wiring error.
• Check wiring terminations for corrosion.
• Check for operation outside of the limits.
• Check for condenser air recirculation.
• Check the circuit for proper charge.
• Check the EXV for proper operation.
• Check the EXV input devices, pressure transducer and
temperature for accuracy.
• Check the liquid line filter drier for a restriction.
Crankcase Heater Failure
A1.02 — Compressor A1
A2.02 — Compressor A2
Alarm
.01
th
CODES AND POSSIBLE
A3.02 — Compressor A3
A4.02 — Compressor A4
B1.02 — Compressor B1
B2.02 — Compressor B2
B3.02 — Compressor B3
B4.02 — Compressor B4
C1.02 — Compressor C1
C2.02 — Compressor C2
C3.02 — Compressor C3
C4.02 — Compressor C4
Criteria for Trip — The alarm criteria are checked whether the
compressor is ON or OFF. The scroll protection module
(SPM) monitors crankcase heater current draw. This family of
alarms is generated if one of the following criteria is detected:
1. The SPM fails to detect a crankcase current draw of at
least 0.5 amps while the crankcase heater is ON.
2. The SPM detects a crankcase current draw of at least
0.5 amps while the crankcase heater is OFF. The current
is sensed internally on the SPM.
Action to be Taken — If a fault is detected, the affected com-
pressor will be shut down or not allowed to start.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• Check the wiring to the crankcase heater.
• Check the crankcase heater for operation.
• Check the SPM crankcase heater output operation.
• Confirm unit configuration.
High Pressure Switch
A1.03 — Compressor A1
A2.03 — Compressor A2
A3.03 — Compressor A3
A4.03 — Compressor A4
B1.03 — Compressor B1
B2.03 — Compressor B2
B3.03 — Compressor B3
B4.03 — Compressor B4
C1.03 — Compressor C1
C2.03 — Compressor C2
C3.03 — Compressor C3
C4.03 — Compressor C4
Criteria for Trip — The alarm criterion is checked whether the
circuit is ON or OFF. This alarm will be generated if the circuit
high pressure switch (HPS) opens. The scroll protection mod-
ule (SPM) monitors the HPS. The 30RB units employ one
HPS for each circuit. The HPS signal is connected to all of the
SPM modules of the circuit.
Action to be Taken — The circuit shuts down immediately or is
not allowed to start.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• Check the wiring of the high pressure switch circuit. Be sure
the HPS is connected to all of the SPM boards in the circuit.
• Check the maximum condensing temperature (MCT) for
the proper setting.
• Check for noncondensables in the refrigerant circuit.
• Check for condenser air re-circulation.
• Check for the proper refrigerant charge (overcharged).
• Check for operation beyond the limit of the machine.
• Check the condenser coils for debris or restriction.
• Check the condenser fans and motors for proper rotation
and operation.
• Check the discharge service valve to be sure that it is open.
A closed or restricted valve is a potential high pressure trip.
• Check the discharge pressure transducer for accuracy.
• Confirm unit configuration.
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