Carrier AQUASNAP 30RB060-390 Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for AQUASNAP 30RBA315: Installation instructions

63DIAGNOSTIC ALARM CODES AND POSSIBLECAUSESMotor Temperature Too HighA1.01 — Compressor A1A2.01 — Compressor A2A3.01 — Compressor A3A4.01 — Compressor A4B1.01 — Compressor B1B2.01 — Compressor B2B3.01 — Compressor B3B4.01 — Compressor B4C1.01 — Compressor C1C2.01 — Compressor C2C3.01 — Compressor C3C4.01 — Compressor C4Criteria for Trip — The alarm criterion is checked whether thecompressor is ON or OFF. This alarm will be generated if thescroll protection module (SPM) detects a compressor motorPTC (positive temperature coefficient) resistance greater than4.5 k, indicating that the motor temperature is too high.Action to be Taken — The circuit shuts down immediately or isnot allowed to start.Reset Method — Manual. PTC resistance must be less than2.5 kPossible Causes — If this condition is encountered, check thefollowing 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 andtemperature for accuracy.• Check the liquid line filter drier for a restriction.Crankcase Heater FailureA1.02 — Compressor A1A2.02 — Compressor A2A3.02 — Compressor A3A4.02 — Compressor A4B1.02 — Compressor B1B2.02 — Compressor B2B3.02 — Compressor B3B4.02 — Compressor B4C1.02 — Compressor C1C2.02 — Compressor C2C3.02 — Compressor C3C4.02 — Compressor C4Criteria for Trip — The alarm criteria are checked whether thecompressor is ON or OFF. The scroll protection module(SPM) monitors crankcase heater current draw. This family ofalarms is generated if one of the following criteria is detected:1. The SPM fails to detect a crankcase current draw of atleast 0.5 amps while the crankcase heater is ON.2. The SPM detects a crankcase current draw of at least0.5 amps while the crankcase heater is OFF. The currentis 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 — ManualPossible Causes — If this condition is encountered, check thefollowing 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 SwitchA1.03 — Compressor A1A2.03 — Compressor A2A3.03 — Compressor A3A4.03 — Compressor A4B1.03 — Compressor B1B2.03 — Compressor B2B3.03 — Compressor B3B4.03 — Compressor B4C1.03 — Compressor C1C2.03 — Compressor C2C3.03 — Compressor C3C4.03 — Compressor C4Criteria for Trip — The alarm criterion is checked whether thecircuit is ON or OFF. This alarm will be generated if the circuithigh pressure switch (HPS) opens. The scroll protection mod-ule (SPM) monitors the HPS. The 30RB units employ oneHPS for each circuit. The HPS signal is connected to all of theSPM modules of the circuit.Action to be Taken — The circuit shuts down immediately or isnot allowed to start.Reset Method — ManualPossible Causes — If this condition is encountered, check thefollowing items:• Check the wiring of the high pressure switch circuit. Be surethe HPS is connected to all of the SPM boards in the circuit.• Check the maximum condensing temperature (MCT) forthe 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 rotationand 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.Alarm Descriptor thAlarm SuffixCode Number to identify source.01Alarm PrefixA1 – Compressor A1 FailureA2 – Compressor A2 FailureA3 – Compressor A3 FailureA4 – Compressor A4 FailureB1 – Compressor B1 FailureB2 – Compressor B2 FailureB3 – Compressor B3 FailureB4 – Compressor B4 FailureC1 – Compressor C1 FailureC2 – Compressor C2 FailureC3 – Compressor C3 FailureC4 – Compressor C4 FailureCo – Communication FailureFC – Factory Configuration ErrorMC – Master Chiller Configuration ErrorP – Process FailurePr – Pressure Transducer FailureSr – Service Notificationth – Thermistor FailureAlarmFig. 33 — Alarm Description