Carrier AquaSnap 30RAP011-060 Controls, Start-Up, Operation, Service, And Troubleshooting page 94

1. The suction pressure of both circuits is sampled 5 seconds
before the compressor is brought on, right when the com-
pressor is brought on, and 5 seconds afterwards.
2. The rate of suction pressure change from 5 seconds before
the compressor is brought on to when the compressor is
brought on is calculated.
3. The rate of suction pressure change from when the
compressor is brought on to 5 seconds afterwards is
calculated.
4. With the above information, the test for reverse rotation is
made. If the suction pressure change 5 seconds after com-
pression is greater than the suction pressure change 5 sec-
onds before compression – 1.25, then there is a reverse rota-
tion error.
This alarm will disable mechanical cooling and will require man-
ual reset.
A150 (Unit is in Emergency Stop) — If the CCN emergency
stop command is received, the alarm is generated and the unit will
be immediately stopped.
If the CCN point name "EMSTOP" in the system table is set to
emergency stop, the unit will shut down immediately and broad-
cast an alarm back to the CCN, indicating that the unit is down.
This alarm will clear when the variable is set back to "enable."
A151 (Illegal Configuration) — An A151 alarm indicates an in-
valid configuration has been entered. The following are illegal
configurations.
• Invalid unit size has been entered.
• Fluid is water with ICE making configured.
• Incorrect AUX board installed with Motormaster config-
ured (AUX 1 must be used).
• Incorrect AUX software version (must be 3.0 or higher).
A152 (Unit Down Due to Failure) — Both circuits are off due to
alerts and/or alarms. Reset is automatic when all alarms are
cleared. This alarm indicates the unit is at 0% capacity.
T153 (Real Time Clock Hardware Failure) — A problem has
been detected with MBB real time clock hardware. Try resetting
the power and check the indicator lights. If the alarm continues,
the board should be replaced.
A154 (Serial EEPROM Hardware Failure) — A problem has
been detected with the EEPROM on the MBB. Try resetting the
power and check the indicator lights. If the alarm continues, the
board should be replaced.
T155 (Serial EEPROM Storage Failure Error) — A problem
has been detected with the EEPROM storage on the MBB. Try re-
setting the power and check the indicator lights. If the alert contin-
ues, the board should be replaced.
A156 (Critical Serial EEPROM Storage Failure Error) — A
problem has been detected with the EEPROM storage on the
MBB. Try resetting the power and check the indicator lights. If the
alarm continues, the board should be replaced.
A157 (A/D Hardware Failure) — A problem has been detected
with A/D conversion on the boards. Try resetting the power and
check the indicator lights. If the alarm continues, the board should
be replaced.
T170 (Loss of Communication with the Compressor Expan-
sion Module) —This alert indicates that there are communica-
tions problems with the compressor expansion module. All func-
tions performed by the CXB will stop. The alarm will automati-
cally reset.
A172 (Loss of Communication with the EXV Board) — This
alarm indicates that there are communications problems with the
EXV board. The alarm will automatically reset.
T173 (Energy Management Module Communication Failure)
— This alert indicates that there are communications problems
with the energy management. All functions performed by the
EMM will stop, which can include demand limit, reset and capac-
ity input. The alarm will automatically reset.
T174 (4 to 20 mA Cooling Set Point Input Failure)
alert indicates a problem has been detected with cooling set point
4 to 20 mA input. The input value is either less than 2 mA or
greater than 22 mA.
T175 (Loss of Communication with the AUX Board)
This alarm indicates that there are communications problems with
the AUX board. All functions performed by the AUX board will
stop, which can include digital scroll unloader operation and low
ambient head pressure control. The alarm will automatically reset.
T176 (4 to 20 mA Reset Input Failure) — This alert indicates a
problem has been detected with reset 4 to 20 mA input. The input
value is either less than 2 mA or greater than 22 mA. The reset
function will be disabled when this occurs.
T177 (4 to 20 mA Demand Limit Input Failure) — This alert
indicates a problem has been detected with demand limit 4 to 20
mA input. The input value is either less than 2 mA or greater than
22 mA. The reset function will be disabled when this occurs.
A179 (Fan VFD Communication Failure) — This alarm indi-
cates that there are communications problems between MBB and
fan VFD. When this alarm occurs, the chiller will shut down. Re-
set is automatic when all alarms are cleared.
A189 (Cooler Pump Auxiliary Contacts Inputs Miswired) — This
alarm indicates that Pump 1 auxiliary contacts are closed when
Pump 2 output is energized or Pump 2 auxiliary contacts are
closed when Pump 1 output is energized. When this alarm occurs,
both pump outputs are turned off. Reset is automatic when all
alarms are cleared.
T190 (Cooler Pump 1 Aux Contacts Failed to Close at Start-
Up) — This alert indicates that Pump 1 auxiliary contacts did not
close within 26 seconds after Pump 1 was started. When this alert
occurs, Pump 1 will be turned off. Pump 2 will be started if avail-
able. Manual reset is required for this alert.
T191 (Cooler Pump 2 Aux Contacts Failed to Close at Start-
Up) — This alert indicates that Pump 2 auxiliary contacts did not
close within 26 seconds after Pump 2 was started. When this alert
occurs, Pump 2 will be turned off. Pump 1 will be started if avail-
able. Manual reset is required for this alert.
T192 (Cooler Pump 1 Failed to Provide Flow at Start-Up) — This
alert indicates that Pump 1 did not provide flow to close flow
switch within 60 seconds after Pump 1 was started. When this
alert occurs, Pump 1 will be turned off. Pump 2 will be started if
available. Manual reset is required for this alert.
T193 (Cooler Pump 2 Failed to Provide Flow at Start-Up) — This
alert indicates that Pump 2 did not provide flow to close flow
switch within 60 seconds after Pump 2 was started. When this
alert occurs, Pump 2 will be turned off. Pump 1 will be started if
available. Manual reset is required for this alert.
T194 (Cooler Pump 1 Aux Contacts Opened During Normal
Operation) — This alert indicates that Pump 1 auxiliary contacts
open for 26 seconds after initially made. When this alert occurs,
all compressors shut down and Pump 1 will be turned off. Pump 2
will be started if available. Chiller will be allowed to run if Pump 2
starts successfully. Manual reset is required for this alert.
T195 (Cooler Pump 2 Aux Contacts Opened During Normal
Operation) — This alert indicates that Pump 2 auxiliary contacts
open for 26 seconds after initially made. When this alert occurs,
all compressors shut down and Pump 2 will be turned off. Pump 1
will be started if available. Chiller will be allowed to run if Pump 1
starts successfully. Manual reset is required for this alert.
T196 (Flow Lost While Pump 1 Running) — This alert indi-
cates that cooler flow switch contacts open for 3 seconds after ini-
tially made, when Pump 1 is running. When this alert occurs, all
compressors shut down and Pump 1 will be turned off. Pump 2
will be started if available. Chiller will be allowed to run if Pump 2
starts successfully. Manual reset is required for this alert.
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