44
Table 32 Alarm and Alert Codes (cont)
ALARM/ALERT
CODE
ALARM OR
ALERT
DESCRIPTION
WHY WAS THIS ALARM
GENERATED?
ACTION TAKEN BY
CONTROL
RESET
METHOD
PROBABLE CAUSE
T051 Alert Compressor A1
Failure–(Seebelow)
See additional descriptions below.
T052 Alert Compressor A2
Failure–(Seebelow)
T055 Alert Compressor B1
Failure–(Seebelow)
T056 Alert Compressor B2
Failure–(Seebelow)
High Pressure Switch
Trip HPS input to CCP module
open
Comp. shut down Manual Loss of condenser air/water
flow. Operation beyond chiller
capability. Liquid valve not
open.
No Motor Current CCP reads less than 10%
of MTA on all legs for
>3.0 seconds
Comp. shut down Manual Power supply disconnected,
blown fuse(s), wiring error, con-
tactor not energized, faulty cur-
rent toroid, check toroid
wiring.
Current Unbalance CCP measures current
imbalance between phases
must be above C.UNB for
25 minutes
Circuit shut down Manual Loose terminals on power
wires. Alert will be generated if
measured imbalance exceeds
set point.
Single Phase Current
Loss
CCP measures current
imbalance between phases
greater than 50% (running
current <50% of MTA) or
30% (running current
≥ 50%
of MTA) for 1 second.
Circuit shut down Manual Blown fuse, wiring error, loose
terminals
High Motor Current CCP detects high current
compared to MTA setting
Comp. shut down Manual Operation beyond chiller capa-
bility, improperly punched con-
figuration header, blown fuse
Ground Fault Trip CCP detects ground current
(4.0 ± 2.0 amps)
Comp. shut down Manual Motor winding(s) gone to
ground, wiring error, loose plug
connector.
Contactor Failure CCP detects min. 10% of
MTA for 10 seconds after
shutting off compressor con-
tactor. Oil solenoid is ener-
gized.
All remaining com-
pressors shut down.
All loaders deener-
gized. Min. load valve
of affected circuit
energized (if
equipped)
Manual Faulty contactor, contactor
welded, wiring error.
Current Phase
Reversal
CCP detects phase reversal
from toroid reading or from
incoming power supply.
Circuit shut down Manual Terminal block power supply
leads not in correct phase. Tor-
oid wire harness crossed.
Check compressor contactor.
Motor Over
Temperature
CCP detects motor winding
temperature >245 F
Comp. shut down Manual Motor cooling (all) or Econo-
mizer (2 comp. circuits) sole-
noid failure, low refrigerant
charge. Faulty economizer TXV
or poor bulb connection to
motor cooling line.
Open Thermistor CCP detects open circuit in
motor temp thermistor
Comp. shut down Manual Wiring error or faulty
thermistor*
MTA Header Fault CCP finds error with MTA
value punched out in header.
Comp. shut down Manual Header pins on CCP board
either all or none punched out,
header not fully seated in CCP
board.
MTA Value Error MTA value stored in MBB
does not agree with MTA
header value from CCP.
Comp. not allowed to
start
Manual Header pin(s) on CCP board
not punched out correctly. See
Appendix A. Incorrect size or
voltage entered when MBB
was downloaded.
Shorted Thermistor CCP detects short circuit in
motor temp thermistor
Comp. shut down Manual Wiring error or faulty
thermistor*
A060 Alarm Cooler Leaving Fluid
Thermistor Failure – 1
Thermistor outside range of
–40 to 240° F (–40 to 116° C)
Chiller shut down Automatic Thermistor failure, damaged
cable/wire or wiring error.
Cooler Leaving Fluid
Thermistor Failure – 2
LWT>EWT+5°Ffor
15 minutes
Chiller shut down Manual Thermistor failure, damaged
cable/wire, wiring error or water
piping error.
A061 Alarm Cooler Entering Fluid
Thermistor Failure
Thermistor outside range of
–40 to 240° F (–40 to 116° C)
Uses 0.1×F/% Total
Capacity as rise/ton
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T062 Alert Condenser Leaving
Fluid Thermistor
Failure
Thermistor outside range of
–40 to 240° F (–40 to 116° C)
None. Chiller contin-
ues to run.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T063 Alert Condenser Entering
Fluid Thermistor
Failure
Thermistor outside range of
–40 to 240° F (–40 to 116° C)
None. Chiller contin-
ues to run.
Automatic Thermistor failure, damaged
cable/wire or wiring error.
T070 Alert Cir. A Discharge Gas
Thermistor Failure
Average of compressor A1
and A2 (if installed)
sensors > 210° F for
30 seconds.
Circuit A shut down Manual Thermistor failure, damaged
cable/wire, wiring error or
motor cooling solenoid failure.
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