Operating instructions

97
Criteria for Trip — The alarm criterion is tested whether the
unit is ON or OFF. If communication with EXVA, B or C is
lost for a period of 10 seconds, the alarm will be triggered.
Action to be Taken — If running, Circuit A, B or C will shut
down normally. If Circuit A, B or C is not operating, it will not
be allowed to start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• power supply to EXVA, B or C
• address of the EXV board
• local equipment network (LEN) wiring
• confirm unit configuration
Alarm 44
— Loss of Communication with Fan Board 1
(Co.F1)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF. If communication with Fan Board A is lost for a
period of 10 seconds, the alarm will be triggered.
Action to be Taken — If the number of fans per circuit is
greater than four fans per circuit, Circuit A will shut down nor-
mally if they are running. Circuit B will continue to run. If the
circuit or circuits controlled by the board are not running, then
they will not be allowed to start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• power supply to Fan Board A
• address of the Fan Board A
• local equipment network (LEN) wiring
• confirm unit configuration
Alarm 45 — Loss of Communication with Fan Board 2
(Co.F2)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF, and only if Circuit A or B has more than four fans
per circuit.
NOTE: Fan Board B controls Circuit B only.
Action to be Taken — If communication with Fan Board B is
lost for a period of 10 seconds, the alarm will be triggered. If
running, Circuit B will shut down normally. If Circuit B is not
running, then it will not be allowed to start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• power supply to Fan Board B
• address of the Fan Board B
• local equipment network (LEN) wiring
• confirm unit configuration
Alarm 46 — Loss of Communication with Fan Board 3
(Co.F3)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF, and on units with three circuits only. If communi-
cation with Fan Board C is lost for a period of 10 seconds, the
alarm will be triggered.
Action to be Taken — If running, Circuit C will shut down nor-
mally. If the circuit is not running, then it will not be allowed to
start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• power supply to Fan Board C
• address of the Fan Board C
• local equipment network (LEN) wiring
• confirm unit configuration
Loss of Communication with Free Cooling Board
Alarm 47 — Board 1 (Co.01)
Alarm 48 — Board 2 (Co.02)
NOTE: Alarms 47 and 48 are not used or supported. If this
condition is encountered, confirm machine configuration.
Alarm 49 — Loss of Communication with Energy Manage-
ment Module Board (Co.03)
Criteria for Trip — The criterion is tested whether the unit is
ON or OFF and when a function that requires the Energy
Management Module (EMM) is configured. If communication
with the EMM is lost for a period of 10 seconds, the alarm will
be triggered.
Action to be Taken — If any function controlled by the EMM
(3-Step and 4-20 mA Demand Limit, 4-20 mA and Space
Temperature Reset, Occupancy Override, and Ice Build) is
active, that function will be terminated. If an EMM function is
programmed, and communication is lost, the function will not
be allowed to start.
Reset Method — Automatic, if communication is established,
the functions will be enabled.
Possible Causes — If this condition is encountered, check the
following items:
• The EMM is installed, (EMM NRCP2 Board, EMM). If
EMM NRCP2 Board, EMM=YES, then check for a con-
trol option that requires the EMM that may be enabled (cor-
rect configuration if not correct).
• power supply to EMM
• address of the EMM
• local equipment network (LEN) wiring
• confirm unit configuration to be sure that no options that
require the EMM are enabled
Alarm 50 — Loss of Communication with Heat Reclaim
Board (Co.04)
NOTE: Alarm 50 is not used or supported. If this condition is
encountered, confirm machine configuration.
Alarm 51 — Loss of Communication with AUX Board 6
(Co.05)
Criteria for Trip — The alarm criteria are checked whether the
unit is ON or OFF. If units are configured for dual cooler pump
control (Cooler Pumps Sequence, PUMP=2,3,4) or HGBP =
YES. If communication with the AUX board is lost then the
alarm will be generated.
Action to be Taken — Unit shut down or not allowed to start.
Reset Method — Automatic, if communication is established,
the unit will start normally.
Possible Causes — If this condition is encountered, check the
following items:
• power supply to the HGBP/PUMP board
• address of the HGBP/PUMP board
• local equipment network (LEN) wiring
• confirm network configuration
Alarm 52 — Cooler Freeze Protection (P.01)
Criteria for Trip — The alarm criteria are checked whether the
unit is ON or OFF. If the entering or leaving water thermistor
senses a temperature at the freeze point or less, the alarm will
be generated. For a fresh water system (Cooler Fluid Type,
FLUD=1), the freeze point is 34 F (1.1 C). For medium tem-
perature brine systems (Cooler Fluid Type, FLUD=2), the
freeze point is Brine Freeze Set Point (Brine Freeze Setpoint,
LOSP).
Action to be Taken — Unit shut down or not allowed to start.
Chilled water pump will be started.
Reset Method — Automatic, first occurrence in 24 hours if
LWT rises to 6° F (3° C) above set point. Manual, if more than
one occurrence in 24 hours.