Operating instructions

100
Check the power supply to the System Manager and unit
controls.
Low Oil Level Failure
Alarm 78 — Circuit A (P.75)
Alarm 79 — Circuit B (P.76)
Alarm 80 — Circuit C (P.77)
Criteria for Trip — The criteria are tested whether the com-
pressor is on or off. The alarm is generated if:
• The compressor is not running and an increase in capacity is
required and the compressor is not started.
• The compressor is running and the oil level switch is open
for more than 45 seconds.
Action to be Taken — The affected compressor will be turned
off.
Reset Method — Automatic, when the oil level is elevated,
first three times the alarm is tripped in a 24-hour period. Man-
ual if alarm is tripped more than three times in a 24-hour
period.
Possible Causes — If this condition is encountered, check the
following items:
• oil level in the oil separator
• oil level switch wiring to the CPM board
• CPM board for a faulty channel
• faulty oil level switch
• oil solenoid valve stuck open
Alarm 81 — Master Chiller Configuration Error (MC.nn)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. The units must be configured as a Master and
Slave machine (Master/Slave Select, MSSL=1 and Master/
Slave Select, MSSL=2), and one of the following configura-
tion errors has been found. The “nn” refers to the error code
listed in Table 60.
Action to be Taken — Unit not allowed to start in Master Slave
control.
Reset Method — Automatic
Possible Causes — If this condition is encountered, check the
following:
• CCN wiring.
• Control power to each Main Base Board, master and slave.
• Move to first position.
• Confirm unit configuration.
Alarm 82 — Initial Factory Configuration Required (FC.n0)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. The alarm will be generated if the Unit Capacity
Model, TONS=0.
Action to be Taken — The unit is not allowed to start.
Reset Method — Automatic after factory configuration is com-
plete. The configuration must be manually completed.
Possible Causes — If this condition is encountered, confirm
the unit configuration.
Alarm 83 — Illegal Configuration (FC.nn)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. 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 61.
Action to be Taken — The unit is not allowed to start.
Reset Method — Automatic after reconfiguration is completed.
Possible Causes — If this condition is encountered, confirm
the unit configuration (None, UNIT).
Alarm 84 — Unit is in Emergency Stop (P.31)
Criteria for Trip — The criterion is tested whether the units are
ON or OFF and when the machine receives a Carrier Comfort
Network
®
(CCN) command for an Emergency Stop.
Action to be Taken — Unit will stop, or will 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
Alarm 85 — Pump 1 Fault (P.32)
Alarm 86 — Pump 2 Fault (P.33)
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
operating and the circuit opens, the alarm will be generated
immediately.
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:
• interlock wiring circuit
• control signal to the pump controller
• cooler pump contactor for proper operation
• control voltage for proper voltage (on 208-volt systems, be
sure the proper tap on TRAN1 is utilized)
Alarm 87 — Condenser Flow Switch Failure (P.15)
NOTE: Alarm 87 is not used or supported. If this condition is
encountered, confirm machine configuration.
Reclaim Operation Failure
Alarm 88 — Circuit A (P.34)
Alarm 89 — Circuit B (P.35)
Repeated High Discharge Gas Overrides
Alarm 90 — Circuit A (P.37)
Alarm 91 — Circuit B (P.38)
Alarm 92 — Circuit C (P.39)
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:
• Maximum Condensing Temperature (MCT) for the proper
setting
• noncondensables in the refrigerant circuit
• condenser air re-circulation
• proper refrigerant charge (overcharged)
• operation beyond the limit of the machine
• condenser coils for debris or restriction
• condenser fans and motors for proper rotation and operation
• discharge service valve to be sure that it is open. Check the
discharge pressure transducer for accuracy
• confirm unit configuration