Specifications

86
For criteria for trip 3, all compressors will be stopped with-
out going through pumpdown. Cooler pump will be stopped
with no delay.
If the unit is OFF, for criteria for trip 1, the unit will not start.
Reset Method — Manual if at least one compressor is operat-
ing. Automatic if no compressors are operating.
Possible Causes — If this condition is encountered, check the
following items:
• low chilled water flow
• a faulty flow switch
• flow switch wiring
• Main Base Board for a faulty channel
Alarm 125 —
Water Exchanger Temperature Sensors
Swapped (P.97)
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 (connec-
tor J6, channels 1,2).
• Check for a faulty entering or leaving water temperature
sensor.
• Check cooler nozzles for proper water temperature sensor
locations.
Alarm 128 — Service Maintenance Alert (Sr.nn)
Criteria for Trip — This alert is tested whether the unit is ON
or OFF and when 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 53.
Table 53 — Service Maintenance Alert Codes
Action to be Taken — None.
Reset Method — Manual, after the service has been completed.
Possible Causes — If the Sr-01, 02, or 03 conditions are
encountered, check the following items:
• sensor wiring to the Main Base Board
• sensor for accuracy
Compressor Motor Temperature Too High
Alarm 132-01 — Circuit A (A1.01)
Alarm 133-01 — Circuit B (B1.01)
Criteria for Trip — The alarm criteria are checked when the
compressor is ON. This alarm will be generated if:
• The temperature is greater than 245 F (118 C) and it has
been greater than 212 F (100 C) for 10 consecutive seconds.
• The compressor temperature is greater than 232 F (111 C)
for 90 seconds (but less than 250 F [120 C]).
Action to be Taken — The circuit shuts down immediately.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• faulty wiring and loose plugs
• faulty CPM board
Compressor Motor Temperature Out of Range
Alarm 132-02 — Circuit A (A1.02)
Alarm 133-02 — Circuit B (B1.02)
Criteria for Trip — The alarm criterion is checked when the
compressor is ON. This alarm will be generated if: the temper-
ature is greater than 245 F (118 C) and it has NOT been greater
than 212 F (100 C) for 10 consecutive seconds.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• faulty compressor temperature thermistor
• faulty wiring and loose plugs
• faulty CPM board
Compressor High Pressure Switch Protection
Alarm 132-03 — Circuit A (A1.03)
Alarm 133-03 — Circuit B (B1.03)
Criteria for Trip — The alarm criterion is checked when the
compressor is ON. This alarm will be generated if the circuit
high-pressure switch (HPS) opens for more than 2 seconds.
The CPM board monitors the HPS switch.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual (reset button on switch)
Possible Causes — If this condition is encountered, check the
following items:
• loss of condenser water flow
• condenser pump failure
• compressor operating beyond the operation envelope
• faulty high pressure switch or wiring
• faulty CPM board
Compressor Overcurrent
Alarm 132-04 — Circuit A (A1.04)
Alarm 133-04 — Circuit B (B1.04)
Criteria for Trip — The alarm criterion is checked when the
compressor is ON. This alarm will be generated if the CPM
board detects a motor current greater than 93% MTA (must
trip amps) and less than 2 times that for more than 1.7 seconds.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• Compressor operating beyond the operation envelope.
• Incorrect MTA setting.
Compressor Locked Rotor
Alarm 132-05 — Circuit A (A1.05)
Alarm 133-05 — Circuit B (B1.05)
Criteria for Trip — The alarm criterion is checked during
start-up when the compressor is ON. This alarm will be gener-
ated if the CPM board detects a high motor current compared
with the MTA (must trip amps) setting for more than 450 ms.
Action to be Taken — The compressor will be stopped.
Reset Method — Manual
Possible Causes — If this condition is encountered, check the
following items:
• compressor mechanical failure
• unloader slide valve failure
• compressor motor failure
CODE DESCRIPTION
Sr.01 Circuit A Loss of Refrigerant Charge
Sr.02 Circuit B Loss of Refrigerant Charge
Sr.04 Water Loop Size Warning
Sr.06 Cooler Pump 1 Servicing Required
Sr.07 Cooler Pump 2 Servicing Required
Sr.08 Condenser Pump 1 Servicing Required
Sr.09 Condenser Pump 2 Servicing Required
Sr.10 Water Filter Servicing Required
Sr.11 Compressor A Oil Filter Servicing Required
Sr.12 Compressor B Oil Filter Servicing Required
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