Carrier AQUASNAP 30RB060-390 Controls, Start-Up, Operation, Service And Troubleshooting Instructions page 64

Motor Sensor PTC Out of Range
A1.04 — Compressor A1
A2.04 — Compressor A2
A3.04 — Compressor A3
A4.04 — Compressor A4
B1.04 — Compressor B1
B2.04 — Compressor B2
B3.04 — Compressor B3
B4.04 — Compressor B4
C1.04 — Compressor C1
C2.04 — Compressor C2
C3.04 — Compressor C3
C4.04 — Compressor C4
Criteria for Trip — The alarm criterion is checked whether the
circuit is ON or OFF. The scroll protection module (SPM)
monitors the compressor motor temperature. This alarm will
be generated if the motor sensor PTC in the compressor resis-
tance is less than 50  or greater than 17 k.
Action to be Taken — The circuit shuts down immediately or
not allowed to start.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• Check the sensor wiring to the scroll compressor protec-
tion module (SPM).
• Check for a faulty SPM.
• Check for a compressor failure.
• 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.
• Check the discharge pressure transducer for accuracy.
• Confirm unit configuration.
SPM Board Power Reset
A1.05 – Compressor A1
A2.05 – Compressor A2
A3.05 – Compressor A3
A4.05 – Compressor A4
B1.05 – Compressor B1
B2.05 – Compressor B2
B3.05 – Compressor B3
B4.05 – Compressor B4
C1.05 – Compressor C1
C2.05 – Compressor C2
C3.05 – Compressor C3
C4.05 – Compressor C4
Criteria for Trip — The alarm criterion is checked whether the
compressor is ON or OFF. The scroll protection module
(SPM) monitors the 24 vac at the compressor through the high
pressure switch input channel. This alarm will be generated if
the main base board receives a signal from the SPM board
indicating that the compressor went through a power cycle.
Action to be Taken — The compressor is shut down immedi-
ately or not allowed to start.
Reset Method — Automatic
Possible Causes — If this condition is encountered, check the
following items:
• Check the voltage from the main three phase power
supply
• Check the 24 vac wiring connections to the scroll com-
pressor protection module (SPM)
• Check for a faulty SPM.
SPM Board Low Control Voltage Alert
A1.06 – Compressor A1
A2.06 – Compressor A2
A3.06 – Compressor A3
A4.06 – Compressor A4
B1.06 – Compressor B1
B2.06 – Compressor B2
B3.06 – Compressor B3
B4.06 – Compressor B4
C1.06 – Compressor C1
C2.06 – Compressor C2
C3.06 – Compressor C3
C4.06 – Compressor C4
Criteria for Trip — The alarm criterion is checked whether the
compressor is ON or OFF. The scroll protection module
(SPM) monitors the 24 vac at the compressor through the high
pressure switch input channel. This alarm will be generated if
the main base board receives a signal from the SPM board
indicating that the 24 vac level was lower than the allowed
minimum threshold.
Action to be Taken — The compressor is shut down immedi-
ately or not allowed to start as to prevent any contactor chatter-
ing/welding from occurring.
Reset Method — Automatic
Possible Causes — If this condition is encountered, check the
following items:
• Check the voltage from the main three phase power
supply.
• Check the 24 vac wiring connections to the scroll com-
pressor protection module (SPM).
• Check for a faulty SPM.
Loss of Communication with Compressor
Co.A1 — Board A1
Co.A2 — Board A2
Co.A3 — Board A3
Co.A4 — Board A4
Co.B1 — Board B1
Co.B2 — Board B2
Co.B3 — Board B3
Co.B4 — Board B4
Co.C1 — Board C1
Co.C2 — Board C2
Co.C3 — Board C3
Co.C4 — Board C4
Criteria for Trip — The alarm criterion is tested whether the
unit is ON or OFF. If communication with the scroll compres-
sor protection module (SPM) is lost for a period of 10 seconds,
the alarm will be generated.
Action to be Taken — The affected compressor will be shut
down.
Reset Method — Automatic, if communication is established,
the compressor, if called for will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• Check the power supply to the affected SPM.
• Check the address of the SPM to be sure that it is correct.
• Check the Local Equipment Network (LEN) wiring to be
sure that it is connected properly.
• Confirm unit configuration.
Co.E1— Loss of Communication with EXV Board Number 1
Criteria for Trip — The alarm criterion is tested whether the
unit is ON or OFF. If communication with EXV1 is lost for a
period of 10 seconds, the alarm will be triggered.
Action to be Taken — If running, Circuit A and B will shut
down normally. If Circuit A or Circuit B is not operating, it
will not be allowed to start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
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