79
Table 50 — Master/Slave Alarm Code
LEGEND
Table 51 — Illegal Configuration Alarm Code
Cooler Pump Fault
Alarm 100 — Pump 1 Fault (P.32)
Alarm 101 — 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 102 — Condenser Flow Switch Failure (P.15)
Criteria for Trip
— The criteria are tested whether the unit is
ON or OFF. This alarm is generated if the lockout switch
(located in the Energy Management Module) is closed during
normal operation.
Action to be Taken
— All compressors are shut down immedi-
ately without going through pumpdown, and unit is not
allowed to start.
Reset Method
— Automatic, first occurrence in 24 hours.
Manual, if more than one occurrence in 24 hours.
Possible Causes
— If this condition is encountered, check the
following items:
• chilled water flow switch operation
• water flow. Be sure all water isolation valves are open and
check water strainer for a restriction
• interlock wiring circuit
• power supply to the pump
• control signal to the pump controller
• condenser water pump operation
• condenser pump contactor for proper operation
Reclaim Operation Failure
Alarm 103 — Circuit A (P.34)
Alarm 104 — Circuit B (P.35)
NOTE: Alarms 103 and 104 are not used or supported. If this
condition is encountered, confirm machine configuration.
High Condensing Temperature — Out of Compressor
Envelope
Alarm 105 — Circuit A (P.37)
Alarm 106 — Circuit B (P.38)
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
• low condenser water flow
• refrigerant charge (overcharged)
• condenser tubes fouled
• discharge service valve to be sure that it is open. Check the
discharge pressure transducer for accuracy
• unit configuration
MC
ERROR
CODE
MASTER
SLAVE
DESCRIPTION
01
X
X
The master or slave water pump is not configured while the control of the lag unit pump is required
(
lag_pump = 1
)
02
X
Master and slave units have the same network address.
03
X
There is no slave configured at the slave address
04
X
Slave
pump_seq
incorrect configuration
05
X
There is a conflict between the master and the slave LWT option: the master is configured for EWT control
while the slave is configured for LWT control.
06
X
There is a conflict between the master and the slave LWT option: the master is configured for LWT control
while the slave is configured for EWT control.
07
X
There is a conflict between the master and the slave pump option: the master is configured for lag pump
control while the slave is not configured for lag pump control.
08
X
There is a conflict between the master and the slave pump option: the master is not configured for lag pump
control while the slave is configured for lag pump control.
09
X
X
The slave chiller is in local or remote control (
chilstat = 3
)
10
X
X
The slave chiller is down due to fault (
chilstat = 5
)
11
X
The master chiller operating type is not Master:
master_oper_typ
12
X
X
No communication with slave.
13
X
Master and slave heat cool status are not the same.
EWT —
Entering Water Temperature
LWT —
Leaving Water Temperature
FC
ERROR
CODE
DESCRIPTION
01
Unit size is unknown.
02
Reclaim option selected for Heat Pump machine.
03
Hot Gas Bypass configured for a Heat Pump machine.
