215
10087 Loss of Refriger-
ant Flow -
Circuit A
Alarm is triggered by either of the fol-
lowing conditions occurring 3 times
within 24 hrs:
Condition 1: (Approach > Approach
High Threshold OR SST < Freeze –
SST Low Offset) AND DGT Rate >
DGT Rate Threshold AND Startup
Timer Elapsed
Condition 2: (DGT > DGT High
Threshold AND SST Rate < SST
Rate Threshold)
The circuit will be
shut down and not
allowed to start for 5
minutes.
Automatic Override 66 is activated.
10088 Loss of Refriger-
ant Flow -
Circuit B
Alarm is triggered by either of the fol-
lowing conditions occurring 3 times
within 24 hrs:
Condition 1: (Approach > Approach
High Threshold OR SST < Freeze –
SST Low Offset) AND DGT Rate >
DGT Rate Threshold AND Startup
Timer Elapsed
Condition 2: (DGT > DGT High
Threshold AND SST Rate < SST
Rate Threshold)
The circuit will be
shut down and not
allowed to start for 5
minutes.
Automatic Override 66 is activated.
10091 Evaporator Flow
Switch Failure
Tested when the unit is ON:
The alarm will trip if the evaporator
flow switch fails to close within the Off
to On Delay (m_state = On) OR
if the evaporator flow switch is opened
during normal operation
Tested when the unit is OFF:
The alarm will trip if the evaporator
pump control (cpumpseq > 0) and
evaporator pump_loc (PUMPCONF
table) are enabled and the evaporator
flow switch is closed after the evapo-
rator pump command is OFF for more
than 2 minutes OR
if the evaporator flow switch fails to
close within the Off to On Delay
The unit and evapora-
tor pump will be
stopped immediately.
Automatic, first occurrence
in 24 hours OR
Manual, if the alarm has
occurred in the previous 24
hours
If this condition is encountered, check the fol-
lowing items for faults:
• low evaporator flow
• fouled flow switch sensor tip
• a faulty flow switch
• flow switch wiring (SIOB-A-J3)
• SIOB for a faulty channel
10097 Water Exchanger
Temperature Sen-
sors Swap
Tested only when the unit is running.
The alarm will trip if the leaving water
temperature is higher than the enter-
ing water temperature for more than 1
minute.
The unit will be
stopped
Manual If this condition is encountered, check the fol-
lowing items for faults:
• check LWT (SIOB-A-J25) and EWT
(SIOB-A-J25) wiring at SIOB
• check for faulty entering or leaving water
temperature sensors
• check evaporator nozzles for proper water
temperature sensor locations
10101 Circ A - High satu-
rated temperature
out of map com-
pressor
The alarm is tripped when saturated
suction temperature exceeds a certain
value for an extended period of time
per the following logic:
A timer tallies the elapsed minutes
that saturated suction temperature is
higher than MOP (62.6°F=17°C).
If SST is higher than MOP + 9°F, then
the timer is increased by 2 x the
elapsed minutes.
When saturated suction temperature
is lower than MOP or the circuit is
OFF, the timer is decreased by the
elapsed minutes.
The alarm is tripped when the timer
reached a value higher than 90 minutes.
Circuit A will be shut
down
Manual If this condition is encountered, check the fol-
lowing items for faults:
• wiring of suction temperature thermistor
• accuracy of thermistor
10102 Circ B - High satu-
rated temperature
out of map com-
pressor
Circuit B will be shut
down
Manual
01101 Compressor A
Motor tempera-
ture too high
Tested when the compressor is ON or
OFF.
The alarm is set if compressor motor
temperature CP_TMP_A > 275°F
(135°C).
Circuit A will be shut
down
Manual If this condition is encountered, check the fol-
lowing items for faults:
• check refrigerant charge
• faulty wiring and loose plugs
• faulty SIOB
• faulty compressor temperature thermistor
01103 Compressor A
High Pressure
Switch protection
Tested when the compressor is ON or
OFF. The alarm is set when the Safe
Stop DI-37 of the compressor drive is
opened (terminal 37 on the compres-
sor VFD).
Circuit A will be shut
down
Manual If this condition is encountered, check the fol-
lowing items for faults:
• condenser fans and motors for proper ro-
tation and operation
• compressor operating beyond the limits of
the operating envelope
• faulty high pressure switch or wiring (ter-
minals 12 and 37 in VFD)
• plugged/fouled condenser coil
• excessive charge
Table 168 — Alarm Details by Code (cont)
ALARM
CODE
ALARM NAME
CRITERIA
FOR TRIP
ACTION TAKEN
BY CONTROL
RESET
METHOD
POSSIBLE CAUSES/CORRECTIVE ACTIONS
To Next Page
Loading...
