Discharge Transducer Failure - Carrier AQUASNAP 30RB060-390 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

• Confirm correct configuration.
P.31 — Unit is in Emergency Stop
Criteria for Trip — The criterion is tested whether the units are
ON or OFF and the machine receives a Carrier Comfort Net-
work (CCN) command for an Emergency Stop.
®
Action to be Taken — Unit will stop, or not allowed to start.
Reset Method — Automatic, once a return to normal command
is received.
Possible Causes — If this condition is encountered, check for
CCN Emergency Stop command.
Cooler Pump Fault
P.32 — Pump 1 Fault
P.33 — Pump 2 Fault
Criteria for Trip — The criterion is tested whether the units are
ON or OFF. This alarm will be generated if the cooler pump
interlock opens. When starting the pump, the control must read
an open circuit for 3 consecutive reads. If the pump is operat-
ing and the circuit opens, the alarm will be generated immedi-
ately.
Action to be Taken — The pump and machine will be shut
down. If there is another pump available, the control will start
that pump, restart the machine and clear the alarm. If no other
pump is available, the unit will remain OFF.
Reset Method — Manual.
Possible Causes — If this condition is encountered, check the
following items:
• Check the interlock wiring circuit.
• Check for a control signal to the pump controller.
• Check the cooler pump contactor for proper operation.
• Check control voltage for proper voltage. On 208-volt
systems, be sure the proper tap on TRAN1 is utilized.
Reclaim Operation Failure
P.34 — Circuit A
P.35 — Circuit B
Criteria for Trip — Reclaim operation failure due to high SCT.
This alarm is for units with the heat reclaim option only.
Action to be Taken — The affected circuit will return to air
cooled mode.
Reset Method — Manual.
Possible Causes — If this condition is encountered, check the
following items:
• Check for low water flow. Be sure all water isolation
valves are open.
• Check for plugged water strainer.
• Check for fouled tubes in reclaim condenser.
Repeated High Discharge Gas Overrides
P.37 — Circuit A
P.38 — Circuit B
P.39 — Circuit C
Criteria for Trip — The criterion is tested when the circuit is
ON. This alarm will be tripped if the circuit capacity is reduced
more than 8 times in 30 minutes due to high discharge gas tem-
peratures. If no override occurs in a 30-minute period, the
counter is reset.
Action to be Taken — The affected circuit will be shut down.
Reset Method — Automatic, after 30 minutes. If the alarm is
cleared via the Manual method, the counter will be reset to
zero.
Possible Causes — If this condition is encountered, check the
following items:
• 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. Check the discharge pressure transducer for
accuracy.
• Confirm unit configuration.
Repeated Low Suction Temperature Overrides
P.40 – Circuit A
P.41 – Circuit B
P.42 – Circuit C
Criteria for Trip — This alarm was added in software version
1.09. The criterion is active when circuit is ON. If the circuit's
capacity is reduced more than 6 times by the Capacity Over-
ride 23 (Circuit A), 24 (Circuit B), or 25 (Circuit C) for the
respective circuit, without at least 30 minutes elapsing between
the capacity reductions, the alarm is triggered. If at least
30 minutes elapses without a reduction in capacity, the counter
is reset to zero.
Action to be Taken — Circuit shut down.
Reset Method — Manual.
Possible Causes — If this condition is encountered, check the
following items:
• Confirm unit configuration.
• Check EXV operation.
• Check for a liquid line refrigerant restriction, service valve
partially closed, filter drier with excessive pressure drop.
• Check the refrigerant charge.
• Check suction pressure transducer accuracy.
• Check return gas thermistor accuracy.
• Check Circuit Superheat Set Point (Configuration
 
SERV SHP.A, SHP.B, or SHP.C).
• Check if system contains antifreeze (Configuration
 
SERV FLUD=2).
• Check Brine Freeze
 
SERV LOSP) if an antifreeze solution is used.
• Check fluid flow rate.
• Check strainer for a restriction, clean if necessary.
• Check for cooler fouling.
• Check compressor oil level. If oil level is above the top
of the sightglass, then oil may be logging in the cooler.
Adjust oil level in compressor(s).
P.97 — Water Exchanger Temperature Sensors Swapped
Criteria for Trip — The alarm criterion is checked when the
chiller is ON and one or more compressors is running. This
alarm will be tripped if the entering water temperature is less
than the leaving water temperature for more than 1 minute.
Action to be Taken — The chiller is shut down immediately.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• Check LWT and EWT wiring at main base board (con-
nector J6, channels 1,2) .
• Check for a faulty entering or leaving water temperature
sensor.
• Check cooler nozzles for proper water temperature sen-
sor locations.

Discharge Transducer Failure

Pr.01 — Circuit A
Pr.02 — Circuit B
Pr.03 — Circuit C
Criteria for Trip — The criterion is tested whether the circuit is
ON or OFF. This alarm is generated if the voltage as sensed by
the MBB or FB3 is 0 vdc.
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Set Point (Configuration