Suction Transducer Failure; Reclaim Pumpdown Pressure Transducer; Water Exchanger Fluid Thermistor Failure - Carrier AQUASNAP 30RB060-390 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Action to be Taken — The circuit is shut down normally, or not
allowed to start.
Reset Method — Automatic, once the transducer voltage is
greater than 0 vdc.
Possible Causes — If this condition is encountered, check the
following items:
• Check the sensor wiring to main base board (Pr.01 and
Pr.02).
• Check the sensor wiring to Fan Board 3 (Pr.03).
• Check the board for a faulty channel.
• Check for a faulty transducer.
• Confirm unit configuration.

Suction Transducer Failure

Pr.04 — Circuit A
Pr.05 — Circuit B
Pr.06 — Circuit C
Criteria for Trip — The criteria are tested whether the circuit is
ON or OFF. The alarm is generated if one of the following cri-
teria is met:
1. This alarm is generated if the voltage as sensed by the
MBB or FB3 is 0 vdc.
2. The circuit is ON in cooling mode and the saturated
suction temperature for the circuit is greater than the ref-
erenced cooler leaving temperature (RCLT) for more than
60 seconds.
RCLT = EWT – (EWT – LWT) * circuit running tons /
total tons
Action to be Taken — The circuit is shut down immediately, or
not allowed to start.
Reset Method — Automatic when the suction pressure reading
is within the range except if it was tripped by criteria 2.
The reset will be manual if the alarm trips 3 times within a
24-hour period or if it has been tripped by criterea 2.
Possible Causes — If this condition is encountered, check the
following items:
• Check for power to the compressor (i.e., circuit breaker,
contactor operation).
• Check the sensor wiring to main base board (Pr.04 and
Pr.05).
• Check the sensor wiring to Fan Board 3 (Pr.06).
• Check the board for a faulty channel.
• Check for a faulty transducer.
• Check for a faulty leaving water temperature sensor.
• Confirm unit configuration.

Reclaim Pumpdown Pressure Transducer

Pr.07 — Circuit A
Pr.08 — Circuit B
Criteria for Trip — Tested when the unit is On or Off. This
alarm is generated if the voltage as sensed by the heat reclaim
board is 0 vdc. This alarm is for units with the heat reclaim
option only.
Action to be Taken — The circuit will initiate a reclaim to air
cooled changeover and stay in air cooled mode if it had been
operating in reclaim mode.
Reset Method — Automatic when the transducer reading
returns to normal.
Possible Causes — If this condition is encountered, check the
following items:
• Check the sensor wiring to heat reclaim board.
• Check for a faulty transducer.
• Check the board for a faulty channel.
• Confirm unit configuration.
Sr.nn — Service Maintenance Alert
Criteria for Trip — This alert is tested whether the unit is ON
or OFF and the Servicing Alert decisions listed under

Time Clock MCFG have been enabled. The alarm will be
generated if the one of the following configuration errors is
detected by the control. The "nn" refers to the error code listed
in Table 44.
Action to be Taken — None.
Reset Method — Manual, after the service has been completed

and Time Clock MCFG
Possible Causes — If this condition is encountered, confirm
the machine's configuration.
Table 44 — Service Maintenance Alert Codes
CODE
01 Circuit A Loss of Refrigerant Charge
02 Circuit B Loss of Refrigerant Charge
03 Circuit C Loss of Refrigerant Charge
04 Water Loop Size Warning
05 Air Exchanger Cleanliness Warning
06 Pump 1 Servicing Required
07 Pump 2 Servicing Required
08 Reclaim Pump Servicing Required
09 Water Filter Servicing Required

Water Exchanger Fluid Thermistor Failure

th.01 — Entering
th.02 — Leaving
Criteria for Trip — If the temperature as measured by
the thermistor is outside of the range –40 F (–40 C) to 240 F
(115.6 C).
Action to be Taken — The unit shuts down normally, or is not
allowed to start.
Reset Method — Automatic, the alarm will reset once the
thermistor reading is within the expected range.
Possible Causes — If this condition is encountered, check the
following items:
• Check the sensor wiring to the main base board.
• Check the sensor for accuracy.
For thermistor descriptions, identifiers and connections, see
Thermistors on page 71.
th.03 — Circuit A Defrost Thermistor Failure
th.04 — Circuit B Defrost Thermistor Failure
Criteria for Trip — This alarm is for a heat pump machine
only. This feature is not supported for a cooling only machine.
Action to be Taken — None
Reset Method — Automatic
Possible Causes — If this condition is encountered, confirm
the machine's configuration.
th.08 — Entering Condenser Reclaim Thermistor
Criteria for Trip — Tested when the unit is On or Off. This
alarm is generated if the temperature measured by the sensor is
outside the range of –40 F (–40 C) to 240 F (115.6 C). This
alarm is for units with the heat reclaim option only.
Action to be Taken — The unit will return to the air cooled
mode.
Reset Method — Automatic, the alarm will reset once the
thermistor reading is within the expected range.
Possible Causes — If this condition is encountered, check the
following items:
• Check the sensor wiring to the heat reclaim board.
• Check for a faulty thermistor.
• Check the board for a faulty channel.
• Confirm unit configuration.
th.09 — Leaving Condenser Reclaim Thermistor
Criteria for Trip — Tested when the unit is On or Off. This
alarm is generated if the temperature measured by the sensor is
70

RS.SV is reset for the alert.
DESCRIPTION